Clutch frying launches of GTR's and GTST's

[Dima r33]

Hey guys,

I have read an article on autospeed.com saying that the only way to get a sub 5 sec 0-100 time for basically any GTR is to brutally drop the clutch at 7000rpm!!!! Any first hand experience any1?

Also the other day I tried to launch my r33gtst from 3000rpm and all I got was time sapping wheelpspin even tho I narrowly ended up beating by about a car length an Integra type R who got a good head start. But if I launch it at around 2000rpm there is a distinct lagginess b4 it starts to really hustle. Any thing above 2 grand and theres lotsa wheelspin (on new 225 tyres). Whats the best way to launch these cars?

[RazorGTR]

Hahaha ummmmm yep been there done that. Actually I have dropped it at 7,700 rpm for drag racing and have gotten a best 60' time of 1.680 which is not bad on daily street tyres.

Now I have done the same in my old R32 GTS-t, which was pretty well modified. You will need a paddle clutch to do that more than once though as it will destroy your factory one really quick. Both of these cars were upgraded with a 5 puck Kevlar/Ceramic paddle clutches.

In the GTS-t it was a 2,000 lb one ( heavy on the leg a bit)

GTR - 2,400 lb which is bare minimum but just enough for time being.

With these clutches to give you an idea of the bite you get with them. In my old GTS-t I had three mates in the car, a full tank of fuel. I was traveling at 60kph or about 38 mph, pushed the clutch in, revved it to 8,000rpm, and side stepped the clutch in second. This was in the dry, and it spun the wheels for well over 75 meters or 240 feet. Not clutch slippage. Yet these clutches are not a true on/off type. They are very nice to drive in stop and go. You get just a slight bit of juddering when you take off. They however do not like to be slipped too much.


Now for a good type of launch with your car I would suggest getting out to a private area and practice. If you have a factory clutch you can slip it a bit with out dramas. I used to launch my GTS-t with 225 50 16's at around 3,300 rpm but I also had a rather large turbo on it. When it still had a factory turbo it was more like 2,700 depending on conditions. You will have to feel your car's feed back.

With the GTR it is simple. Rev the snots out of it and dump the clutch or it bogs down. Now considering I can get all 4 wheels spinning and I've got 255 40 17's on it, it is finding that happy medium.

[RazorGTR]

Here is how hard my GTR launches at 7,500 rpm. Opps a bit of a red light. R/T was .498 on a .5 light



Trying to put heat into the rear tyres. This is what happens with over 400hp and dumping the clutch at over 7,000 rpms


And the result of that effort

[Dima r33]

whooaa bloody awesome!!
So it is the 4wd system on the GTR that lets you do that? Do u still lose some wheel spin time launching it like that?

Razor, whats the best 0-100 time you have gotten launching it that way?

[phatdex]

Yep, its the 4wd system.

All the mags launch the GTR's at around 8000rpm to get their best times.
MOTOR mag in Australia got a normal R34 GTR with an exhaust and new clutch to do a 4.5 second 0-100kmh in one of their tests. Thats basically a stock car.
And that is with half a tank of fuel, 2 ppl in the car and all the heavy corrovit gear they use to test times.

[RazorGTR]

It does if you bypass the 4wd system with a switch or pull the fuse. the burnout was in 2wd. The lauches were 4wd.

I've done a few by stop watch and the best so far is 4.3-4.4

[Neb]

How well does the drivetrain handle those clutch drops?

[barrigaS14]

DAMN!!!

[SkylineUSA]

How does the 4 wheel system work, when your front wheels are off the ground..
Answer, not very well.

Razor,
Awesome launch. Your car seems to have very good weight transfer. Put a solid rear axle, and you would even be quicker j/k

You are running, 255/40? Do you srub at all? What size rim, offset, width? I am almost done with my Panasports, I can build them either 9" or 10.5 width. That is why I am asking the question about your 255, if I can go bigger I will.

[RazorGTR]

The wheels are momo GT2's 17x8. I am not sure on the offset but probably factory which should be 30. They fit perfect under the guards with no rubbing.

I've got a set of Panasport G7's 17x9 which I also had 255/40's on and they just fit under the guards. The fronts had a different offset to the rears and were not interchangeable.

Hey I need two new outers for them, one front and one rear. Would you have a contact to the place your getting yours done? We can't get them down here at all.

[SkylineUSA]

Razor,

I am doing the work myself. I sent you a PM.

The G7, of course you know, were only intended for the guys in Japan.

[RazorGTR]

Yep got it. I didn't know that. I do know they are very light weight and what I am looking for, for racing. Since they have a lot less unsprung weight than the Momo's by heaps. I weighed the Momo's and they were just over 10kg's a wheel with no tyre!

[R33]

Wow...that is one helluva awesome launch Razor..yeeeeeeeeeeeeha! George Bush will like that!
I have launched mine at various rpm...5500/6500 and 7500 rpm. All with different result. I was then using OS Giken double plate clutch with the ETC switched off thus relying solely on the ATESSA.
With 5500rpm launch, the car launched smoothly out of the line without any spin at all and against an EVO 6 RS, I managed to be head to head in 1st and 2nd gears (which was really good considering the RS' weight advantage). In 3rd, I slapped the RS silly!
At 6500rpm, the rear spins a teeny wee bit and I think there was not much of a difference between 5500 n 6500 rpm launches.
Somewhere between 7000-7500 rpm, yes, it gets really wild n manic. The rear wheels must be really warmed up before doing this as they will spin quite a bit. And when it takes off, the car would struggle for traction (especially the front wheels...the car can be a bit unruly at this point) if the wheels are not warm. I have tried this one nite and shyte...let's just say I won't do it again if the wheels are cold!
But if the wheels are warm, 7500rpm would be the best launch in my car. Done that uphill (about 10% incline) and I recorded 4.6secs. 0-100kph on my HKS timer!

[Moppie]

Originally posted by R33

Somewhere between 7000-7500 rpm, yes, it gets really wild n manic. The rear wheels must be really warmed up before doing this as they will spin quite a bit. And when it takes off, the car would struggle for traction (especially the front wheels...the car can be a bit unruly at this point).................

Unruly is a sublte way of putting it.

Sitting beside Vince (who is really really short by the way, and can only just reach the pedals and still see over the wheel) when he dumps the clutch, then strugles madly with the wheel to keep the car straight as the frounts light up and want to go side ways, and the rears do the same thing but go in the opposite direction can leave you with a small fraction of apprehension.

[RazorGTR]

Hahahaah Moppie.

yea the ol tart was lighting them up pretty hard that day. Funny to think that the car is now pushing another 45kws at the wheels since then

Have to get your mate back in the car and see if he remembers to keep leaning back lmao. For those that missed it check this poor bloke out.

Now before we go:


Now as we launch at 7,700 rpm