So,
here we are again, another year, another large scale 4wd buggy to
talk about. For those of you who missed my independent review of
this car's predecessor, Smartech's original Thunderbolt, I'll quickly
recap...
Based
on the Smartech Titan monster truck, the Smartech Thunderbolt was
a solid car and design, though let down by some out-of-the-box flaws...
The supplied 28cc Smartech own brand engine was not very strong,
the diffs were greased but not oil-filled, and the body and wing
were poorly conceived and implemented, not to mention somewhat ugly
in my opinion.
The
new car is again based on the same platform as the Thunderbolt 1
(hereafter referred to as the TB1), but the changes for this new
edition of the Thunderbolt design are wholesale, not least of all
the change in company which is producing it. Nutech is a fairly
new RC company, and split off from Smartech, bringing a number of
staff and designs with them. Although sharing some minor infrastructure,
Nutech has no official relationship or partnership with Smartech,
and should not be considered in any way the same company.
As
I have mentioned in the forums from time to time, even the better
Chinese models (Nutech, among a few others, fall squarely into the
category of 'better' Chinese models) have often been let down by
ugly bodies and bizarrely unappealing paint schemes.
I'm
pleased to say that Nutech appears to be bucking that trend and
then some! The body on the new car is a sight to behold. The photographs
throughout this review do not do the car justice. Even my 'not-in-the-slightest-into-rc'
female companion was impressed with the look of the car after I
dragged it from its box in the living room (I can tell she likes
it, as she hasn't even demanded I take it down to the basement yet!).
This car will definitely turn heads at the local bash spot, it's
a real looker.
With
the increasing number of 4wd models hitting the 1/5th market, stock
equipment selection is playing a more and more important role in
the value represented by RTRs, and therefore which models lead the
market.
Nutech
have responded by supplying us with a plethora of features not previously
seen on a 1/5th scale RTR, and rarely seen in any scale. The stock
features and parts on this car truly make this package stand out
as great value, especially when you consider that no other RTR or
ARTR offers so much for the price, and some cost twice as much.
I
know of no other RTR 1/5th scale which offers ALL of the following
as standard equipment: 3 viscous planetary diffs with spider gears
and steel helical cut rings and pinions, all steel drivetrain, alloy
chassis braces, shock towers and hinge pin holders, CNC steering
knuckles, 6mm shock shafts, 8mm turnbuckles, a genuine CY 26cc engine,
a 2.4Ghz OEM radio with independent EPA, a beautifully painted body,
preinstalled electronics, and last but not least, something I wish
ALL the manufacturers would include... a complete disassembly/reassembly
manual with parts list, options list, and safety tips.
The
car is already the easiest large scale RC to work on that I have
ever owned due to it's simple and highly modular layout. This manual
just serves as the icing on the cake. Scanning through it, I realise
how simple it is to put together from scratch. None of this 'remove
part a, remove part c, replace part a, to remove part b', etc. The
entire front and rear ends are built 'off' the chassis, as is the
centre section, and then everything is just bolted onto the chassis
at the end. What this means is that almost any part of the car can
be worked on without removal of any other part. The lazy and impatient
hobbyist inside me likes that a lot.
One
of the things that makes this model stand out in its design aspect,
is how similar it is to a 1/8th buggy, one of the most durable and
tried and tested chassis layouts in RC.
If
you took a 1/8th buggy, and scaled it up to 1/5th, you'd have something
that looked startlingly similar to the TB2. This is a good thing,
as the 1/8th buggy chassis and drivetrain layouts have proven bulletproof
for many generations. The strength inherent in the design lends
itself well to the large scale conversion, and everything that's
important has been suitably beefed up. Check out those steering
arm turnbuckles for example, they are enormous.
Anyway,
I've got the rest of the review to go into detail on the specifics
of the model, so without further ado, lets get started...
The
Thunderbolt II is a 4WD 1/5th scale gasoline powered racing buggy.
It is supplied fully assembled and RTR (Ready-to-Run). In order
to complete and start the car, you will need transmitter batteries
(8xAA type) and fuel (mixed with the appropriate amount of two-stroke
oil, 25 parts fuel to 1 part oil, or 40ml of oil per liter of fuel),
and a further 4 AA batteries for the receiver and servos. If you
decide to go for a proper 6v receiver pack, you will also need some
means of charging it.
The
TB2 is well packed and held down with the usual bewildering arrangement
of cardboard partitions. When the main model is removed from the
box, the (painted) body and (glued) tires are already fitted. All
that remains, is to fit the wing (just 2 body clips), either populate
the 4xAA battery holder with 4 of the standard 1.5v alkaline non-rechargeable
type batteries (rechargeable AAs unfortunately are 1.2v, and 4.8v
total simply isn't enough to power the servos in such a large model),
or fit a suitable rechargeable sub-C battery pack (must be purchased
separately), and extend the receiver antenna using the supplied
tube.
Out
of the box... A real looker
Supplied assembly
manual
Tidy
1/8th style chassis layout
The
radio equipment is surprisingly good. The 2.4Ghz radio is a functional
and good looking item. Rarely we see RTR radios with independent
EPA for throttle and steering, let alone a 2.4Ghz transmission method.
The steering servo is a fairly standard quarter scale affair, and
seems adequately specified to do the job. While not lightning quick,
it's pretty strong at 18kg-cm of torque (250oz-in) and has a solid
plastic horn. The throttle servo is the standard small scale type,
but also has a fairly impressive spec, and is enough for throttle
and braking requirements.
There's
no getting away from the lack of a supplied receiver battery though,
it is essential to get a rechargeable sub-C receiver pack as a matter
of urgency. 4 AA batteries are just not capable
of supplying the required juice to correctly and safely operate
large scale servos, not to mention they would be consumed probably
before the first tank of fuel.
Also
included in the box is the aforementioned manual (great inclusion
Nutech), any leftover decals (stickers) and a spark plug tool, with
a driver end compatible with most of the philips head screws. Again
though, Nutech have not seen fit to include at least a small sample
of silicone oils, which is disappointing but expected. This brings
me to the honourable mention of the thing that will hit you the
hardest when you take it out of the box. The shocks are awesome,
very large, with thick springs and shafts and nicely anodised black
caps (alloy caps top and bottom) and natural aluminum bodies.
The
shocks are fitted with conical pistons so that they bound faster
than they rebound (in other words, they compress easily and return
slowly), this increases stability over the rough stuff. The shock
action seems just right, I have no plans to change the oil for now.
The manual suggests that the shocks should have 1000wt in them,
and that seems about right as an initial setup.
There
is also a surprising amount of suspension travel for a buggy, more
even than my FG monster truck, and the geometry of the suspension
can be adjusted radically, with many mounting options (holes) included
on the shock towers and arms for tuning to your specific surface
or track. The stock ground clearance is a staggering 6cm plus, depending
on shock spacer fitment.
The
included engine is a genuine CY (Chung Yang) clone of the classic
Zenoah Komatsu units. These have become industry standard as a good
medium ground between the higher quality Zenoah units, and the cheap
low quality copies. Displacement is 26cc, a welcome step up from
the usually supplied 23cc engines in RTRs. It is mated to a regular
CY clutch, and a 'can' style exhaust, which keeps noise down to
a relatively manageable level, but strangles the engine a bit. The
power from this engine, is more than acceptable for a stock RTR.
Most
people will upgrade the pipe of any RTR as a matter of course, due
to the huge power gains you can make with this simple modification,
but I find that the can style pipes often give a good balance of
performance/noise. Some people couldn't care less how much noise
their RCs make, to those people I recommend the most powerful pipe
they can find, as any extra power will be welcome in a 4wd platform.
Personally living in one of the most densely populated cities in
the world, I like to keep my noise down.
In
going for a CY engine, Nutech have ensured that their model is compatible
with most of the power upgrades available. A simple headkit replacement
gives the option, rather than replacing the entire engine, to replace
only the top half and piston, which is much cheaper than buying
a complete engine, and yields the exact same performance increase
(eg if you buy a 30cc headkit and fit it on your 26cc engine, there
is no difference than buying a 30cc engine straight off the bat,
except a headkit is often less than half the price of a new engine.
This is one of the advantages of gas engines over nitro. The TB2
also features a 700ml tank which should give around 40mins+ of runtime.
A
fairly average air filter design has been employed on the TB2, favouring
an open fronted type, over the closed type previously seen on Nutech/Smartech
cars. It is a dual element, however, in my model, neither element
was oiled. I applied air filter oil to the inner element, leaving
the outer element dry, and I would highly recommend placing an outerwear
cover over the whole filter assembly, just for additional protection.
Included
CY 26cc engine
Carb and enclosed
filter
Can style
stock exhaust
The
drivetrain is one of the shining acheivements of the car. It features
all metal gears from the clutch all the way to the wheels, a nice
and rare feature on an RTR. The power is transferred from the clutch
through the clutch bell to a pair of hardened steel gears (pinion
and spur), then via a shaft to a helical cut pinion driving the
center diff ring gear. In turn, the diff drives the front and rear
driveshafts, which turn the front and rear diffs (via helical ring
and pinion gears again, front and back), transferring power to the
wheels. Sadly, there are a lot of right angles inherent in the design,
which sap power before it gets to the wheels, but this is unavoidable
for all shaft designs.
One
of the complaints I had heard from others (though I didn't have
this issue myself) concerning the TB1 (and the truck on which it
is based, the Titan), is that the diff bulkheads were too weak,
and when putting more powerful engine and pipe combinations, the
diffs would try to burst out of their cases, in some cases succeeding.
This has been addressed by making the diff bulkheads a touch smaller,
and while that may seem like the wrong way to go, it actually increases
stiffness of the plastic. To be honest, this is not so much of a
worry in the buggy models, due to their smaller diameter wheels
putting less strain on the ring and pinion gears of the diffs, but
it's good that they have tried to address this. Only long term testing
will reveal how effective this change has been.
Impressively
thick driveshafts
Lexan gear
cover
with
warnings
Helical cut
main spur
(F & R also)
The
real bonus of the drivetrain changes, as I briefly mentioned in
the intro, is the fact that all the differentials are now sealed
and will hold silicone oil. After the tires, this is the single
most effective handling (tuning) option available to the off road
basher/racer. This will make a huge difference to the way the car
handles, straight out of the box. The diffs already have some sort
of locking grease in them, though it is impossible to say what strengths
are employed, so I'll just describe the out of the box setup: The
center is predictably very stiff, the front slightly less stiff,
and the rear fairly loose. I will definitely be playing with different
oils in these until I am happy I have found a combination that compliments
my driving style.
The
main gears are covered by a plastic cover to prevent rocks and debris
from getting in between them, and warnings about moving parts are
stuck to the outside of the cover, to avoid unexpected loss of wandering
fingers. The characteristic 'jingle' is still apparent in the drivetrain
of this model, as it is in all the cars based on this design. To
put it simply, when you are running the car, it's like there is
a GI Joe inside the cockpit, ringing a little bell constantly. It
might irritate you at first, but you'll quickly get used to it.
It's
caused by the meshing of the two flat cut hardened steel gears under
the aforementioned plastic gear cover. When removed and dinged together,
they produce a very clean musical note, like a bell or a tuning
fork. I have become used to the noise they make, and it does not
bother me at all, in fact, I find it kind of friendly and would
miss it if it was not there. In any case, the important thing to
note here, is that it is normal, nothing is loose, and it does not
affect performance. Dogbones are still fat and very heavy duty.
so far they haven't made any effort to pop out of their equally
heavy duty drive cups either.
The
brakes are intact from the 1/8th scale buggy type design, large
fiber discs fore and aft of the center diff, to allow some tunability
in terms of brake bias, though I find there is little value in setting
the bias to anything much other than 50/50 or at most 55/45 (front
bias), as the center diff should be very stiff to get best performance
(using silicone oils), and any braking on one disc will also slightly
brake the other side as well. I'm leaving mine at 50-50. I like
the dramatic look of a car locking up all four wheels at the same
time and skidding to a stop. We'll talk more about this in the 'Out
for a Bash' section later on.
Finally,
the stylish rims have a reassuring feeling of solidity about them
and the design is appropriately meaty for the car on which they
sit. The tires are a surprisingly good multi-purpose dirt and gravel
tire, and are very well glued to the rims (far too perfect to be
done by hand, must be a machine). All four corners wear the exact
same size rims and tires, as one would expect for a 4x4. I have
found the grip AND durability of these tires to be hundreds of percent
above my expectations, they really are excellent on dust and gravel.
I haven't done any rocky running, so I can't comment on their durability
under extreme duress, some may still find they rip on sharp rocks
as do all but the most durable large scale tires. It's hard to avoid
when putting 4hp plus to the ground, we'll have to wait and see.
The
best part of the Titan based models is thankfully largely unchanged
on the TB2... The awesome shocks. The changes which have been made
are definitely in the positive category. As mentioned above, this
time around the oils in the shocks are correctly specified, and
the conical pistons make the shock action very realistic (soft bound,
quick rebound). I think back to when I first unboxed my FG MT, considered
one of the best large scale models available, and how unbelievably
poor the shocks were. No such problem here, these shocks are as
functional as they are massive and beautiful.
The
shock shafts are like tree trunks, there's no possibility of bending
them, the shocks themselves are noticably bigger than any other
I've seen on a 1/5th scale model, and suspend the car very nicely
indeed. They are fitted with double o-rings at the alloy bottom
caps, and a diafragm under the top caps, both of these do their
job of preventing leaks admirably.
The shock bodies are not threaded for adjustment, and those of you
who know me well, will know also that I am an advocate of this on
off road cars, especially large scale where the thread on the shock
is bigger than on smaller scales, dust gets into the threads, and
destroys the o-rings on the adjusting ring after only a few adjustments.
When this happens the rings get loose, and 'creep' up the shock
during use.
Instead,
the tried and true 'spacer' method is used to obtain the desired
ride height. A few more spacers in the box
would have been nice, but the car rides pretty high, even without
any preload spacers installed. Even with the reduced number
and thickness of the spacers, this car still sits over 6cm from
chassis bottom to level ground, it has the ground clearance of a
monster truck.
Impressive
shocks, now
in black
Serious shafts,
6mm
as standard
Dustproof
Servo Saver
Steering
is handled via the usual bellcrank system, as found on pretty much
all RC models, just beefed up a lot. Also supplied is a big fat
servo saver which does its job well, and can be adjusted from very
slack to very stiff without the use of tools or any disassembly.
On my sample it was much too tight, and I recomend slackening it
off a lot, then slowly tightening as needs dictate. This will help
avoid stripped servo horns when landing awkwardly or hitting rocks.
The
configuration of the suspension arms is exactly what you would expect
at the front with upper and lower A-arms on hingepins. There are
spacers on the upper hingepins on each side of the upper arms, to
allow for a small amount of caster adjustment at the front. The
steering arms have also true reverse threaded turnbuckles (with
tool points) for toe adjustment. As previously mentioned, the turnbuckles
themselves have been beefed up considerably, and are now a lot thicker
than even aftermarket turnbuckles I have seen. If one of these breaks
or bends, I will be truly astonished. I particularly appreciate
this, as I have broken two steering arms on my FG from very insignificant
accidents. There is no way this will happen here.
Rear
suspension geometry
Front
suspension geometry
FAT
turnbuckles; an astonishing 8mm
The
rear upper arms are still nothing more than a turnbuckle, and while
I'd prefer to see a real a-arm, so far it seems fine. It's not a
part that comes under particular strain anyway, so no major concerns.
The
polished stainless lower hingepins, front and rear, are fully captured
in the nice alloy hingepin holders (or lower arm braces as they
have become known recently), so no c-clips or nuts, another feature
which is not common on any RTR car, let alone on a supposedly low
cost Chinese vehicle. The front upper arms only, still use c-clips.
CNC
front hubs
Rear
chassis brace
Front
chassis brace
The
car is not supplied with swaybars or anti-roll bars, but it is patently
obvious from the shape of the plastic diff covers and bulkheads,
that the car has been designed with them in mind. No doubt they
will be available as an option at some point. There is a big fat
groove in the front and rear bulkheads, where one would expect an
anti-roll bar to sit. In fact, due to the obviousness of this arrangement,
the anti-roll bar is conspicuous in its absence.
Finally
(I've saved the best for last) on the steering side, are the alloy
CNC front steering hubs (steering blocks). Yep, that's right, CNC
steering blocks!!! Not only does this mean more durability, but
more importantly, better seating for the wheel bearings, and less
flex. This a first, as far as I know, for any RTR gas car, and is
certainly unheard of at this price point. The CNC steering knuckles
for FG cars are a $60 plus upgrade.
The
main chassis is what we have come to expect from most RC cars. A
solid piece of thick aluminum, curled up slightly at the edges for
rigidity. The chassis anodising (as all of the anodising on the
car, except the steering knuckles, front arm brace, shock bodies
and chassis braces, which are left natural metal for contrast) is
a cool looking black. The chassis is 4mm thick and seems rigid enough,
certainly for off road use.
The
silver philips head screws do much to accentuate the detail against
the black anodising and give the car a nice sporty look, even with
the body off. Unfortunately, that's the only good thing they do,
nobody really wants philips head screws, but we'll get into that
again in a minute...
Wherever
those screws pass through a piece of alloy, the alloy has been countersunk
to avoid screw heads sticking out and catching on things. This goes
for all the alloy parts and not just the chassis underside.
Another
nice feature are the huge CNC alloy chassis braces. These are an
obvious throwback to the 1/8th buggy inspired design, as these parts
are also found on all 1/8th buggies and truggies, and look almost
identical in implementation. These two very solid pieces of alloy
are very apparent, dominating the front and rear of the chassis.
They are not anodised, instead they have been left a natural silver,
which further serves to draw the eye to their imposing presence
against the black chassis and plastics. These braces should ensure
that the front chassis kick-up doesn't get bent, except in the most
extreme of head on collisions, and give some stiffness to the rear.
Other
alloy parts of note on the car are the hingepin holders (lower arm
braces), the steering knuckles, the center diff coverplate, the
shock towers, the front top plate and the entire shock assemblies.
Not many models are supplied with all those parts in alloy. Kinda
makes you wonder what the hop up options are going to be, since
it doesn't seem to need any!?
In
actual fact, I know that the following hop ups will be available
soon, if not by the time this review is posted...
Front
and rear sway bars
Alloy
center diff carriers
Alloy
gearbox covers (F/R)
Alloy
servo mounts
Alloy
gas cap
Vented
steel clutch bell
Alloy
clutch carrier
Alloy
engine mounts (2 separate pieces sold as 1 item)
A
3-shoe lauterbacher type racing clutch
Alloy
diff housings
Alloy
C-hubs
Alloy
rear hub carriers
CVD
driveshafts
I've
ranted in the forums in the past about philips screws and fasteners
and I'm going to again here. Why oh why can't these cars be supplied
with hex hardware? I can't believe that the cost difference between
hex and philips hardware, is so great at the volumes these companies
are buying/making, that it affects the profit margin on a car like
this, and personally, I think there's no excuse for it. HPI showed
us that it can be done with an RTR at roughly the same price point,
so why can't others follow suit?
This
was a big issue for me last year with the last large scale car I
tested, and if anything, it's an even bigger issue now, as the market
is even more competitive and this car is so much better, it doesn't
deserve to be let down by this detail. Come on Nutech, everybody
wants HEX. At least make a set of hex screws available, so I can
add it the list of options above.
Front Bumper
Full
chassis view, wheels off
Chassis
side view, wheels off
FG
style wheel squares are employed on each corner, giving near endless
options for wheel and tire combinations. This is a really nice feature
and shows consideration for the hobbyist. Too many hobby companies
are using proprietary wheels and/or wheel mountings, reducing customer
choice to OEM products which may or may not be up to par with more
standardised parts (I'm talking to you, HPI and MCD ;)
The
rollcage is standard plastic solid tubing, nothing of note there,
except that the design incorporates the rear wing mount and 'bumper'
if you can call it that. Basically, it's an extension of the rollcage
hanging out the back of the car, ala HPI Baja 5B, and not only adds
to the look of the car, but also serves as a reasonable wheely bar
and rear bumper. Future rear exhaust options will probably take
advantage of the added protection offered by this looped extension
of the rollcage. As with all the plastics throughout the car, the
material of the rollcage is of good quality, strong yet flexible.
The
fuel tank leaks from the cap. It's a shame really cos it's a minor
spoiler, but considering the cost of an aftermarket alloy cap, it's
not the biggest deal in the world. Just make sure you line your
car's trunk with something on the way to the bash spot, if there
is fuel in the tank, and especially if you like to corner hard (I
do and I have a nice smell of petrol in my trunk now). The tank
could also do with some extra venting as it suffers slightly from
the classic half tank lean condition, but again, it's not a serious
issue. If you bring it to your feet, let it idle for 20 seconds,
the pressure normalises and you're off again. I'll be installing
a vent pipe myself in the near future. Note: Nutech has
addressed both of these issues in production models, this should
no longer be an issue.
Overall,
a round of applause on material choices and design aspects.
I
had a number of people ask me what the word 'Aesthetics' means after
my last review, so... Aesthetics is how something looks. Great aesthetics
means it's good looking, bad aesthetics means it looks like a dog's
dinner. Moving on...
I
didn't like the way Smartech's original Thunderbolt looked and in
my independent review of that car (don't searc RCU magazine for
it, it's not there!), I had ranted about it for a couple of paragraphs.
I still feel the same way, it was an ugly car and it never grew
on me. Now I have to find a way to ramble on about how much I LOVE
the look of the new car in order to fill the same amount of space!
I don't think it's going to be difficult though, I really like the
aesthetics of the new car.
OK,
so lets start with the new body, since that's the most obvious aesthetic
piece. As you can see from the pics, it's a stunner. In my opinion,
it looks good from every angle, and is sure to turn a lot of heads
at your local bash spot. Not only is it highly sexy, but it also
fits properly!! Who'dathunkit?
No, seriously, none
of the issues that plagued the fitment (and overall design) of the
TB1 body, are present in the new car. No effort has been made to
make the fuel tank accessible without body removal (good, no huge
great holes in the side of the body), and instead of 5 clips (4
of them small and awkwardly placed), the TB2 needs only 3, and they
are all big and easily accessible. I have only one complaint...
The exhaust stinger faces side, and to compensate for this, a simple
90 degree bent rubber pipe directs gasses toward the ground. On
the very first run of the car, this little pipe went missing. Nutech
has now redesigned this so that it stays in place.
Another notable issue
with the body, is the fact that it retains heat due to its quite
close fitting design. I run in places where it regularly hits 95*F
and heat soak is a problem. I will be cutting the windows and windshield
out to compensate for this, as I had noticed that running without
a body increased engine performance quite a bit. You'll notice in
the video that the engine is breathing noticably better when the
body is off.
High downforce
wing
Rims and tires
Optional body
(CF 'look', not real!)
The
rear wing mounting which I have already mentioned several times,
is a fantastic addition, really strengthens and stiffens up the
rear end and the wing itself, which is essentially the same in design,
but has some extra ribbing on the plastic for additional strength.
All in all, the body and rear end looks like it has been properly
thought out, rather than a fleeting afterthought.
As
I mentioned, the rims are great, and the rich yellow colour compliments
the flame design of the body and contrasts nicely with the deep
blue. One small issue however, was that during transit, my car had
been sitting on it's wheels (in the box), slightly misshaping the
foams in the tire. This gave the tires an unbalanced feel on the
first couple of runs, but slowly worked itself out. I strongly recommend
to Nutech that they do not fit the wheels to the car for transport,
to avoid this. When storing the car, the wheels should be off the
ground to prevent exactly this situation from happening.
The
optional 'carbon look' body pictured above can be supplied on the
stock car, for an additional $50 on the asking price. In addition
to the body, there are several other black items included with this
package, such as a black fuel tank and black rims. The part number
for the blacked out version is the same as given in the specifications
above, with an F on the end, ie 057900F. It is also supplied with
a carbon look wing as well, to complete the image.
The
combination of black and natural alloy used throughout is also very
easy on the eye, and indeed the overall package is commensurate
with the suggestion that someone actually thought about how to make
the car look good as well as work well. Bravo to that person, it
worked.
Already
I've run out of ways to say 'Isn't it pretty?', so lets move on.
This
is going to be a short section, there's only so much you can say
about RTR radios, even one as well specced as this...
As
I mentioned above, it's a 2.4Ghz transmitter and receiver. This
is a great thing for so many reasons, but mainly the fact that the
usual 27mhz AM and FM units operate on a frequency which receives
interference from the magneto unit in the engine (the part that
generates the spark in the spark plug). No such trouble here. Of
course it's crystal free, and gives the hobbyist a great confidence,
especially if running where there are other models.
The
inclusion of independent EPA for throttle and steering is really
important, especially on large scale models, where inappropriately
configured end points can cause serious battery drain and in the
worst cases burn up very expensive servos. Setting this up properly
not only resolves these issues but also reduces strain on the throttle
arm of the engine, and also allows for very precise brake adjustments
on the fly without needing a screwdriver. Great job on that Nutech.
In
the pictures you can see a small scale steering servo. This is no
longer the standard equipment on the car, and my model has been
updated since these pictures. Nutech now supply a large scale servo
on steering, which is both strong and fast. I have experienced no
problems with them, except the stripping of one steering servo horn,
which I put down to the servo saver being too tight from the factory
(mentioned above). The servo mounts themselves have been conceived
to accept either a regular small scale servo or a large scale servo.
Another good feature giving the hobbyist additional options over
many cars.
The
only real disappointment in the electrics area, is the lack of a
rechargeable receiver pack. Expecting people to put 4 AA alkaline
batteries into the supplied holder and use that as a battery, is
just not feasible in a $900+ model, let alone the fact that they
simply don't have the juice to steer a 4wd large scale car.
The
failsafe is for signal loss only, which these days is a little inadequate
for gassers, but it's still commendable that they put it in there.
I strongly recommend a proper aftermarket kill switch failsafe,
that will cut in AND kill the engine, in case of signal loss, battery
depletion, battery disconnection, and almost any other kind of radio
failure you can imagine. Even if something goes wrong with the radio
that does not trip the kill switch, all you have to do is turn off
your transmitter, and the engine will die. Consider these type of
failsafes essential equipment to be ordered with the car, along
with a receiver battery and outerwears.
The
radio box is fairly large and I had no problem fitting a 4500mAh
battery, with tamiya style charging jack, the reciever and all the
cabling into it comfortably.
Genuine
congratulations on the radio gear are in order. Too
often RTRs are supplied with poor electronics necessitating immediate
upgrades at no small cost. This equipment should see the beginner
and casual hobbyist into the foreseeable future, only a receiver
battery and a steering servo upgrade should ever be needed. We
should also note however, that the car CAN be supplied from the
factory with either AM, FM or 2.4Ghz radios. I already know that
the US and Canada will see the 2.4Ghz units, and I hope other regions
will see the benefit of this, as it is up to the distributors what
radio they order their cars with. My fingers are crossed for the
European market, as I have seen the AM radio, and it is not special
at all.
So
a quick recap... The diffs now hold oil, the engine is decent and
the car is beautiful. Electronics are well above expectations too,
except for the lack of an rx pack, understandable really considering
the improvements, a little had to be cut from somewhere, and this
is where I would have probably cut costs myself if I were in charge
at Nutech.
All
in all, and as I really expected, this is one truly awesome package
for the price. When you consider all the features that are stock
equipment, it's actually quite mind-blowing. In terms of features
and alloy parts, it exceeds most of my current models, some of which
have had thousands of dollars more spent on them. As an out of the
box feature set, it surpasses any other large scale RTR on the market.
Yes, you heard correctly; best features of any RTR gasser on the
market, and better than a lot of cars sold as racing rollers too!
It's been a struggle to find something significant to complain about
through this entire review. A warning to the other manufacturers...
Nutech is changing the rules of the game.
With
Nutech putting so much effort into aftermarket and parts support,
there's nothing to stop them taking a fair market share as a quality
product mentioned in the same breath as FG or MCD, forever separating
themselves from the cheapness associated with other Chinese models.
The car is already more than competitive with similar Western and
European products in terms of features, so with the right hop ups
and parts availability, selecting a Nutech model for your next gasser
should be a no-brainer.
Still,
the proof is in the pudding as they say, so lets get it down in
the dirt!
This
section is written with about 6 tanks through the car, and many
hours seat-time. Also, I should qualify that I am using a Spektrum
radio (DX3), as my sample was supplied with the AM radio, which
is not going to be used in production models. Rather than wait to
have the new stock unit sent to me, I decided I could achieve the
same effect by installing a Spektrum receiver and just getting on
with it.
The
needles on the carb of the supplied CY 26cc engine were set at an
appropriate setting to allow the car to start and idle straight
away, no fiddling required. I mentioned earlier that I had to oil
the inner element of the filter, DON'T FORGET TO DO THIS, especially
if you run in a dusty area, as I do.
After
pootling around for a half hour, I decided that was enough break
in for a CY engine, and I started tuning. As with all gas engines,
tuning is very easy and the effects of what you are doing are immediately
apparent. This one was no different, and after literally 5 minutes,
I had a tune I was reasonably happy with. The car idled very stably,
and while lacking massive grunt due to the 4wd drivetrain and the
restrictive can style pipe, it took off fairly aggressively as well,
spraying the gravel far and wide from all 4 corners of the car.
After a few tanks, it'll have opened up somewhat and want to be
leaned out a touch more.
Here
we go with the superlatives then... This car drives like no other
RTR I've ever run, straight out of the box. The handling is nothing
short of incredible. It just goes where you point it, no questions
asked. The stock suspension setup is very good, not racing sharp,
but it makes the car very easy to drive well. It grips like a lizard
in even the loosest of surfaces (see the vids). This handling is
in no small part, also down to those outstanding tires. Sure, I'm
lucky, it happens that I run on the surface these tires must be
absolutely designed for, but hey, I'm not complaining! They also
screech like a 1:1 car on asphalt under braking, and are great on
all the types of off road surface I have tried, from hard pack to
loose gravel and everything in between. The only surfaces I haven't
tried, are extreme bumpiness, and grass.
The
4wd system kicks up great rooster tails from front and rear, due
to the good and thick grease supplied in the center diff. I was
really surprised at the quality of the setup, it's clear some thought
has gone into it in order to make the car usable by all skill levels
right out of the box. The suspension geometry, the shock oils, and
even the diffs are remarkably close to the setups I would want if
I configured them with my own oils. It's also a really nice thing
to have 4wd donuts made possible, more accurately described as pirouettes.
Stamp on the gas with the wheels turned and you are soon in a tornado
of spinning wheels and flying dust while the car whirls around on
the spot like a tasmanian devil. Similarly, with just a little opening
of the steering, you can easily encourage it to maintain a perfect
drift going round in an open circle.
The
front diff is medium to stiff (and remember, this is just with a
factory blocking grease, not even silicone oil), while the center
is quite stiff, and the rear quite loose. A standard configuration
reminiscent of the classic 5-7-1 setup commonly used in 1/8th buggies.
Anyway, this setup gives exactly the right amount of torque transferrence
to keep the car under control without losing performance. You can
see in some of the action photos how much the inside front tire
was swelling, which is always satisfying to see, and especially
at this scale. Remember these tires are almost the same diameter
as the spread of an adult hand (to be precise, they are 170mm, the
same as the FG Baja and HPI Baja tire diameter).
This
tire swelling is due to the fact that some of the torque was being
sent to the lightest corner by the diffs, this is good as it keeps
the car under control. Of course if you want full drift behaviour,
you always have the option of filling the center with something
like 50,000 silicone or installing an aftermarket diff locker (such
a product is expected from Vertigo Performance in the near future).
I'll probably go with the locker myself when its available, as I
consider myself a fairly advanced dirt slinger, however, the bonus
of the out of the box setup is how easy it is to drive. Anyone can
look like a master and even a child or a first time hobbyist will
get on well with its easy handling.
After
four tanks, the tires still look like new. I can't stress how good
these tires are, I'm even considering buying a few extra sets to
put on my other cars, as they are tremendous for the surfaces I
run on. Check out some of the action shots, you can see it lifting
the front wheels on occasion, very surprising for a 4wd.
As
expected, it jumps like a 1/8th buggy. Very flat and very easy.
This is obviously a virtue of the similarity of the designs and
the almost 50-50 balance of the car when the fuel tank is full.
This centre of gravity will shift toward the rear as the tank empties
though, due to it's forward location on the chassis. It won't get
much further back than 55-45 though, and since the airborne attitude
of the chassis is easily corrected with throttle and brake application,
it's easy to compensate. In the videos, I had been jumping over
a dirt mound, and as you can see, there were plenty of crashes (more
about the durability in a minute), but this is due to the shape
of that natural obstacle, rather any fault of mine, or the balance
of the car, it was just an awful shape for trying to do jumps. Off
a ramp or a properly shaped jump on a track, you can expect much
better results.
As
it turned out, these crashes worked out well as a means of showing
off the durability of the car which so far has been outstanding.
I haven't lost a dogbone or suffered any major failure, apart from
that stripping of the steering servo horn I mentioned. This was
due to a terrible landing from a jump and an overly tight servo
saver. Once again, I must reiterate the need to slacken it off more,
or replace the servo horn with an alloy aftermarket one.
As
you can see from the video, the car takes a beating and comes back
for more. No worries on the durability front.
What's
left to say... looks great, excellent spec, drives awesome. Very
rewarding and genuinely surprising how well it goes. No complaints
at all... Oh wait... one thing... it could use a bit more steering
lock. Not much of a problem, since you can whip it round by applying
gas, but it does have a surprisigly wide turning circle. I'll be
looking into some kind of DIY steering mod to get it turn in a bit
more sharply. Nutech are also working on this, and may produce an
update pack for the car in the future incorporating such a modification.
Enjoy
the action shots and video below. One small note about the action
shots... Apparent in a few of the shots is a fair quantity of silicone
oil on the right lower arms. This had come out of the right front
shock absorber due to a failure of the plastic cap. This was reported
to Nutech during testing, and the design has been altered to incorporate
alloy bottom caps for all the shocks, eliminating this problem.
All models are now supplied with alloy bottom shock caps. Further
evidence of Nutech's commitment to producing a quality product,
this was not the only design update that was performed based on
my (and others) testing, as there had also been a problem with the
radio box which is now resolved. Nutech obviously care a great deal
about this release and kudos to them for making a number of important
alterations, and not upping the price even though these must have
increased their cost fractionally.
So,
as you can surely tell, I really like this car. I like the forward
thinking attitude of the company that makes it, and I think they
are set to have a big impact on the large scale market if not the
entire hobby (as they are also slowly coming out with smaller scale
electric and nitro models as well).
Also
planned for the future are a truggy and trophy truck based on this
Thunderbolt platform, and a monster truck as well, which will have
some significant suspension geometry and gearing changes. I bet
that'll be an absolute riot to drive.
If
Nutech maintain RTR specifications similar to this, and continue
to produce eye-catching designs, I see them installing themselves
firmly in the middle market as a car of choice. With a few choice
alloy upgrades (engine mounts, diff mounts, clutch carrier), I see
this being a highly effective racing platform as well.
I
highly recommend this model to beginners and advanced hobbyists
alike. Everyone will find something to love about this car, and
little that disappoints.
Look
out for distributor and reseller information in the forums and on
Nutech's site soon.
Thanks
for reading, and making it all the way to the bottom of this long
review.
Foxy
out.
Comments on RCU Review: Nutech Thunderbolt II 1/5th scale RTR 4WD
foxy you have done a very nice job good on you man,we were all waiting on some details about this product and i am happy that you like it as it looks really good tbh.i like the look of there products,unique i think...i can only imagine an alloy version of this.man this company are well ahead with already 4x4 on stock models speaks for itself huh?nice on jf...
The comments, observations and conclusions made in this review are solely with respect to the particular item the editor reviewed and may not apply generally to similar products by the manufacturer. We cannot be responsible for any manufacturer defects in workmanship or other deficiencies in products like the one featured in the review.