evoviiiyou

iTrader: (3)

Does anyone know the max boost that a GT42R turbo can handle, before it starts to be inefficient? It seems that a GT30R runs out of juice at around 30 psi, GT35R maxes out at around 35-37 psi, etc....

scott88vr6

iTrader: (7)

I believe people are running around 40-42 psi with GT42R's

EVOONYOASS

iTrader: (2)

Not to go off topic, but Shep is running upwards of 50+ psi. What turbo is he using? GT47?

evoviiiyou

iTrader: (3)

So my theory of the number after GT is equivelant to the max boost level of the turbine wheel...planned or only a coinsidence?

evoviiiyou

iTrader: (3)

This would go along with my theory...that really well put together combos can run a little more boost than the number after the GT__.

BURNALL_4

iTrader: (16)

my friend has a 91' talon w/ a gt35 on it and put down 760awhp @ 44psi before blowing a whole in the side of the block. imo its all about doing what is said cant be done. and thats how you make crazy power. so who cares where any given turbo is said to be "efficent" a gt35 is sapposed to only be good for 540awhp and he made that @ 33 psi.

Ronin17

That's pretty unbelievable for a 65lb/min turbo. I am not saying I don't believe you, but it sounds a little far fetched.

BURNALL_4

iTrader: (16)

i agree but i watched him do it 4th gear everything done just like normal, and i can honstly say if i didn't see w/ my own eyes i wouldn't believe it. the new turbo is a turbonetics 70 trim rated for like 7 somethimg hp so that should do the job.

Ronin17

Was he using anything that could log airflow, if so any idea what it was? I would think that maybe the calibration on the Dyno could have been off, I don't know if I've ever seen a car put out more WHP than the airflow the turbo is capable of flowing.

Did your friend ever run the car before the dyno? What did he trap?

GTREVO

I'd like to see that on a dynograph though... even the turbine wheel capacity will be maxed out way before you even touch 700WHP... 650ish at 37 - 38 psi is still somehow believable but 760???? I've tried pumping almost 40 into mine and the only thing I've got was hotter air and not horsepower... mine is maxed out at 630 WHP on 35 psi..

CBRE

iTrader: (77)

I have also found 37-38 psi is max on the 35r, any more boost and it runs slower, running over 40psi the car only goes 140, 38 psi it runs 144-144.98, thats at least 40whp loss from hot air.

CBRE

iTrader: (77)

On another note my old race car trapped 148.5(at the DSM shootout in Norwalk on a hot day) running mid 45psi on a GT30 from FP(FP3065), maybe if I would have run less boost it would have gone faster, live and learn.

Drifto

iTrader: (6)

People make more hp than the stock turbo is suposedly capable of on paper so I don't see why It's not possible.

Ronin17

Go read what I said, I don't know if I've ever seen a car put out more WHP than the airflow the turbo is capable of flowing. Evo 8 turbos flow 42 lb/min, I have seen plenty of logs of people flowing more air than a turbo has been rated for, but not 10 lb/min more. Are you saying that you've seen people make over 420 WHP from the stock turbo?

BadazzCR

iTrader: (5)

It has been done before... but I to agree there is no possible way a gt35 can make 760 to the wheels on boost only.. Maybe he was squeezing on it?