R33 Gtr's Have Too Much Torque!

[Goombeh]

Well not exactly,

However, I've recently bought an R33 GTR, the thing is in brilliant condition however I noticed that the front torque gauge would register a split as soon as I moved, no matter how slow I was taking off.

Didn't know why for some time, then realised that the tyre brands front to rear were different. I did a little measurement and found there to be a small difference in overall diameter from front to back.

Now the rears actually measured smaller than the fronts by virtue of their makes so in effect, the computer is seeing that the rears are slipping as they are having to turn a little faster to travel the same distance. So I'm wondering if anyone here knows if the result would be the same if I put the fronts to the rear and vice-versa which would then have the rears turning slightly slower than the fronts.

Would this still produce the same result of torque split? Does it work in this situation where the fronts and turning faster than the rear???

I'd love to know before actually changing them over. Ta.

[blind_elk]

So I'm wondering if anyone here knows if the result would be the same if I put the fronts to the rear and vice-versa which would then have the rears turning slightly slower than the fronts.

No, the ATTESSA will behave itself. (and you could have found the answer in any number of threads which deal with this phenomenon)

[Goombeh]

No, the ATTESSA will behave itself. (and you could have found the answer in any number of threads which deal with this phenomenon)

Well actually no blink_elk, this specific idea has not been addressed, everyone discusses how a difference in general will affect the system, however no one discusses the difference between which way it occurs... ie. front rotating faster or front rotating slower.

But thanks for your response and if you're right, that's very interesting to me.

[lachlanw]

lol . if i was you i wouldnt be making a piont of it.

everyone always talks about how putting the spare on the back f**ks it up and putting the spare on the front is fine(spare generally being a small space saver)

go read up on attesa and you could have figured it out all by yourself ....

[JezR31]

How much torque is being sent to the front? If its just a tiny amount its probably just the attessa preload.

[Pezhead]

Your guess is correct and 33 & 34 GTR's do pre-load the system. No matter how slow you take off the torque gauge will register a little as soon as you start moving until you're rolling at least 20 km/h (from my experience). Then because your rears are smaller, the computer "thinks" that your rears are spinning and thus will transfer torque to the fronts to try to compensate. If the diameters are out enough will do it all the time - that is what is bad for the transfer case. It will try and engage the 4wd but due to the different diameters will force slippage in the transfer case. Over time this will burn it out - they are VERY expensive to fix so this is a bad idea.

If you have to drive it to the tyre shop, swap the larger tyres to the rear so the rears are spinning slower than fronts. This is a temporary fix but get them sorted out quick.

[some_cs_student]

FYI I was quoted around ~1200 for a transfer case rebuild, and you can buy second hand for $200-400, don't break it

[Goombeh]

Cheers guys, I'm taking it that it doesn't happen the other way around (ie. rears moving slower) as some have suggested.

I've put the same brand on the front and it's right, little bit in first at take off and does nothing from then on until it's howling...

Incredibly sensitive system, as the difference between the two was less than 5mm!! And the effect was immense. Fantastic car. Bit like a fussy child who doesn't like wearing different coloured socks.....

Thanks again.

[lachlanw]

yeah i the allowance before slip is 5 % i think , or might be 2% .

i thought nissan could at least privode a spare the right diameter to not cause this but no .

and also under full power you will see up to 30% to the front even if the rears not spinning

also it will go up to bout 30% under hard braking (like emergency stop with abs ) as it hinders wheel lock up

i dont know if youll A ever get it to do this or B if it shows on the gauge

[AzN]

Picked up my stock standard R33 GTR today and the pick up seams slower then my auto GTS25t...

I haven't put the throttle down 100% but when I'm driving, the front torque gauge doesn't move at all.

Top end power is good though.

[lachlanw]

IT WILL NOT MOVE UNTILL THE REAR TIRES BREAK TRACTION

[AzN]

IT WILL NOT MOVE UNTILL THE REAR TIRES BREAK TRACTION

So where should the front torque needle be under heavy acceleration?

[some_cs_student]

IT WILL NOT MOVE UNTILL THE REAR TIRES BREAK TRACTION

Incorrect.

Strong acceleration will move some load to the front wheels, just not a lot.

ATTESSA will work on corners before you lose traction.

You don't need to be too worried about the front torque gauge not moving all the time, you'll notice the difference mostly on corners / hard acceleration or loss of traction.

[AzN]

Incorrect.

Strong acceleration will move some load to the front wheels, just not a lot.

ATTESSA will work on corners before you lose traction.

You don't need to be too worried about the front torque gauge not moving all the time, you'll notice the difference mostly on corners / hard acceleration or loss of traction.

Still not happy with the fact that my auto GTS25t feels like it's got faster pickup though...

Doing a service tomorrow and will look at the air filter, spark plugs and AAC valve.

[Count Grantleyish]

^^^ You're not driving this hard enough and one tip for you, ignore the gauge - not worth losing the enjoyment of GTR.

[ras1983]

Incorrect.

Strong acceleration will move some load to the front wheels, just not a lot.

ATTESSA will work on corners before you lose traction.

You don't need to be too worried about the front torque gauge not moving all the time, you'll notice the difference mostly on corners / hard acceleration or loss of traction.

Correct. In addition to this, ATTESSA also factors in the speed that you're driving at. You'll notice that cruising at 60 km/h there is some torque going to the front wheels, and you'll notice there's even more when you're cruising at 100 km/h on a freeway.

Edited July 7, 2010 by ras1983

[lachlanw]

^ i recon your tires are worn out on the rear

yeah i know it moves under acceleration .to be accelerating hard enough to warrant it moving you had better be looking at the road

[ras1983]

No mate, ATTESSA was upgraded on the R33 and R34 models and the fronts are much more active than on the R32's.

Have a look at the Autospeed road test, Julian noted this with the R33 that he used for the road test.

I have been in and have driven several R33's and a R34, and they have all displayed this same trait.

[rapturem3]

mine doens't move unless i'm taking off hard off the line

[some_cs_student]

The system should be engaging around corners, when accelerating out of them. But when accelerating out of a corner, keep your eyes on the road

The passenger can watch the gauge for you...