T66 A/R? on 88' supra

CarPsyco84 · 11-28-2005

here is a question for the pro's. My buddy was lookin for a good sized turbo to maximize his stock motor. The T66 seems to be a good pick for the 3L 7MGTE. My question is what A/R ratio would be best for power from like 4k rpm to like 7, 7500rpm, I was thinking .81 A/R but maybe even .88?

niterydr · 11-28-2005

http://www.suprasport.com/
Great turbo's!

CarPsyco84 · 11-28-2005

thanx, thats even better, get to keep stock hook up to the turbo....

**Shane@DBPerformance** · 11-28-2005

.68 if you want it to spool by 4000-4500 with a P-trim exhaust wheel.

CarPsyco84 · 11-28-2005

cool thanx for the input, Got another question as long as were on these size turbos, whats the difference between P-trim and Q-trim and what effect does it have I think i've herd that p or q-trim cause slower spool, but I don't know why....

**Shane@DBPerformance** · 11-29-2005

Q-trim is bigger than a P-trim, so it's a big laggier. The GTQ-trim versions aren't too bad though. A Q-trim over a P-trim can be worth worth up to more 50HP on a turbo that size.

CarPsyco84 · 11-29-2005

So one can assume that Q-trim flows more air, and would be for like higher RPM hp than a P-trim, but you sacrifice spool time?

**Shane@DBPerformance** · 11-29-2005

Quote:

Originally Posted by CarPsyco84

So one can assume that Q-trim flows more air, and would be for like higher RPM hp than a P-trim, but you sacrifice spool time?

Yea. But even a Q-trim is not anything all that huge in the Supra world. It all depends on how much power you want to make, how high you can rev the motor, and how much lag you want to put up with. A T67 with a P-trim is capable of around 700whp, a T66 should put out around the same.

Here is how Shaun's 3.0l Supra with a T67 P-trim .68 A/R spooled on the dyno. http://www.boostlogic.com/parts/supr...it67.html#dyno

niterydr · 11-29-2005

Quote:

Originally Posted by ecoli

Yea. But even a Q-trim is not anything all that huge in the Supra world. It all depends on how much power you want to make, how high you can rev the motor, and how much lag you want to put up with. A T67 with a P-trim is capable of around 700whp, a T66 should put out around the same.

Here is how Shaun's 3.0l Supra with a T67 P-trim .68 A/R spooled on the dyno. http://www.boostlogic.com/parts/supr...it67.html#dyno

Wasn't that 689whp on a very unhealthy boost spike? (like 35psi?).
Still spools damm fast!

**Shane@DBPerformance** · 11-29-2005

It was probably like 31-32psi, which is more than the VPC map sensor could read. It made 664whp at 29psi.

niterydr · 11-29-2005

SWEET!
Yeah, John was saying how it spiked higher than the map sensor could read. Is he still going thru fuel problems with the ems? (I remember hearing something about that this summer).
664whp @ 29psi is no joke.

**Shane@DBPerformance** · 11-29-2005

Yea, he did cams, springs, retainers, and AEM, but he had all kinds of problems with the fuel system and gave up on it for a while.

Super Bleeder!! · 11-29-2005

he said SCREW IT and bought another ducati. considering his cash flow and his competitive nature i wouldn't be surprised if his car ended up with a gt42 on it in a few months.

niterydr · 11-29-2005

Sweet, that'll make like 1/2 a dozen local imports with a gt42.

CarPsyco84 · 11-29-2005

when do the valves start to float on those supras anywase...

CarPsyco84 · 11-29-2005

hey, that dyno is on a 2JZGTE, I'm lookin for info on hte old school motor, the 7MGTE...

**Shane@DBPerformance** · 11-30-2005

Quote:

Originally Posted by CarPsyco84

hey, that dyno is on a 2JZGTE, I'm lookin for info on hte old school motor, the 7MGTE...

Well, both are 3 liter motors and the 2JZ head isn't anything to write home about, so unless the 7MGTE is a total pile of crap(the intake manifold might be) the results should be somewhat similar.