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gt 30 dyno results

bigcarl

By bigcarl,
in Engines & Forced Induction

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Cubes Grand Master

Cubes

Posted
Posted

Steve,

My thoughts exactly, what made me think there was a restriction some where in the exhaust is the way the curve flattens out in the top end on the high boost setting.

The power curve can be influenced by the ramp rate a little, but it still looks a little slow getting on to decent boost.

As discopotato once said with this dyno graph... Pumping losses.

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Robo's Mentor

Robo's

Posted
Posted
how can yours fry the tyres, when mine makes the same power and everything, 200rpm later is the only difference and i have not one problem with traction. ??

Judging by your nick, youve got a R31. Maybe they have a softer independant rear end than the 33 or much stickier tyres The 33 is slippery, even i get sideways movement in second once i come on boost with a 2530. Count yourself lucky you dont have these issues. First gear is useless. Ive converted back to stock suspension to get some more grip.

Sydneykid Grand Master

Sydneykid

Posted
Posted
how can yours fry the tyres, when mine makes the same power and everything, 200rpm later is the only difference and i have not one problem with traction. ??

HICAS, too high rear spring rate, poor suspension geometry, too stiff/poorly valved rear shocks, worn sub frame bushes, too high tyre pressure......etc

:D

R31Nismoid Grand Master

R31Nismoid

Posted
Posted
Judging by your nick, youve got a R31.  Maybe they have a softer independant rear end than the 33 or much stickier tyres The 33 is slippery, even i get sideways movement in second once i come on boost with a 2530.  Count yourself lucky you dont have these issues.  First gear is useless.  Ive converted back to stock suspension to get some more grip.

first gear is fine, unless im saveage on a launch. If i am smooth then its totally fine unless im nasty with 1st/2nd gear change then its skating

My rear end is more prone too loose traction than an R33 due to the primative design of the R31 IRS

Ask any coupe owner than tries to get grip, its a mission due too squat and the sheer camber that ends up on the rear causes around 2/3 of the tyre to actually touch the road.

And im only running 245's on the rear, just cheap sumitomo's that in my opinion are very average. Thats on 18's too...

I agree with you SK, some of these guys cars must be shockingly setup as i wouldnt even say my setup is anywhere near what i could be.

still, im at a loss :headspin:

Robo's Mentor

Robo's

Posted
Posted
first gear is fine, unless im saveage on a launch. If i am smooth then its totally fine unless im nasty with 1st/2nd gear change then its skating

My rear end is more prone too loose traction than an R33 due to the primative design of the R31 IRS

Ask any coupe owner than tries to get grip, its a mission due too squat and the sheer camber that ends up on the rear causes around 2/3 of the tyre to actually touch the road.

And im only running 245's on the rear, just cheap sumitomo's that in my opinion are very average. Thats on 18's too...

I agree with you SK, some of these guys cars must be shockingly setup as i wouldnt even say my setup is anywhere near what i could be.

still, im at a loss    :headspin:

Maybe you dont have the power you think you have then. What Sumitomos you running, im running the HRZ 11, 255/40/17.

Steve Grand Master

Steve

Posted
Posted

So many variables. I spent alot of time and money setting up my skyline so it didnt do crazy things.

R31 - non IRS too isnt it? IRS has its own challenges. Just being non IRS and no HICAS would give a car massive advantages until you sorted the issues in a car that is equipped with IRS and HICAS.

Making the power is only half the job IMHO.

Steve Grand Master

Steve

Posted
Posted

Sorry forgot to add, just because two cars make the same peak power, run the same boost and come onto boost around the same rpm, doesnt mean they have the same power over the rev range.

Car A at 1 bar may be making 250rwkw @ 4000rpm, car B may only be making 180rwkw at the same rpm and boost. Both may make 300rwkw peak power. The shape of the curve makes a big difference too.

R31Nismoid Grand Master

R31Nismoid

Posted
Posted
So many variables. I spent alot of time and money setting up my skyline so it didnt do crazy things.    

R31 - non IRS too isnt it?  IRS has its own challenges.  Just being non IRS and no HICAS would give a car massive advantages until you sorted the issues in a car that is equipped with IRS and HICAS.

Making the power is only half the job IMHO.

HR31 has IRS and HICAS

HICAS i still retain, and all of it is very primative.

And i have 270rwkw, there is no doubt about it. Rolls off Race Pace Dyno as such :rofl:

See what it makes next weekend @ AutoSalon... :)

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