i just picked up a garrett gtx3576r. I have both the t3 gt 3" inch vband housing in both .63 and .82 ar. Which one should i use?

I currently have a ball bearing 50 trim making about 380whp on 91 octane and 500whp on e85. My goal is to make 450whp on 91 octane. I do not plan to run or tune for e85/race gas. Boost will most likely b 11-13psi. This is all on a stock s2000 f20c.

 

Dyno both and let us know the difference! Since you dont plan to push the limits of the turbo Id use the .63 but since you already have both, Id try both.

 

the .82 is going to give you 15-20whp up top and only sacrafice a couple hundred rpm spool difference

 

What do u think the spool and power difference will be between the 2 housings.

 

Bump for answers

 

 

My opinion is you can make up that torque difference with a few more psi on the .63 but it will also spool a few hundred rpm faster. Its not going to taper off either because youre not anywhere close to breaking a sweat with that turbo at 450/500.

 

^This

 

i'm about to slap the turbo on and get the car retuned next week and i'm still very undecided on which of these two housings i should run.

please remember that i'm not going to be running e85/race gas and i'm only going to get tuned on 91 octane which means only 11-13psi of boost and i'm expecting anywhere from 400-450whp.

 

What matters more...usable power or peak power numbers?

 

Seriously. You're fine with a .63A/R with that N111 68mm turbine. I've run over 650whp on that turbine housing and exhaust wheel combination with little backpressure issue of any kind. For that level, there's no reason to do a .82. All its going to do is shift the powerband out several hundred rpms , and you really won't gain that much power because you're not even in the effective range of that turbocharger at 450whp and 91 octane.

Its up to you, but I deal with that housing and turbine combination on a regular basis. You've got nothing to worry about with that goal, seriously.

Don't think Evolution like your GT3586HTA where its pushed to the wall. you've got an efficient cylinder head and enough displacement to handle it fine.

.63A/R... Done..

 

Id love to see you post a back to back comparison since you have both housings.

 

At 450whp? He'll show a small shift of power to upper end of the powerband at that low range of boost pressure to make 450whp on a GTX3576R.

When he puts some good boost pressure, then he'll show some real changes in peak power.

 

Out of curiosity why did you go with such a large turbo with a 450whp goal, and no intention of going higher? thats low boost for that turbo. Seems the Gtx3076r would have been a better fit. It's strictly a street car right?

It still a really nice turbo tho, so cant blame you there if you got it for room to grow. But by saying you want to run that turbo at such low boost levels with relativley low power goals (for that turbo) Makes me question your logic?

btw, i think ive mentioned this before....but 500whp is impressive from your last setup on a 50trim...That must have been one hell of powerband

 

I'm pretty sure it's some got something to do with his 91 octane rating vs IAT's (brief memory from a past thread). I'm sure he'll elaborate if so....

 

My car with the current 50 trim turbo is at about 380whp on 91 octane and 501whp on e85. Its feels great great and very fast and enjoyable on e85 but i am not happy with the speed/power on 91 octane. My car is a 100% street car driven everyday with ac in stop and go traffic 15,000+ miles a year. The closest e85 station is 30 miles away so the car must run 91 octane 99% of the time. making power on e85/race gas is easy. With e85/race gas you can max out any turbo with no problems. But running e85/race gas is not realistic something i can do everyday. So the goal it to make as much power as i can on straight 91 octane since that is the type of fuel i must run. So the soulution was to buy the best turbo $$ can buy for the job.

As far as me running low boost its because of 2 things. One, its because i'm on a stock s2000 11:1 compression engine. Two, the car must run straight 91 octane fuel. I always run as much boost that safe on the type of fuel i'm tuning on. With 91 octane the most boost that my tuner runs is usually 11-13psi. With e85/race gas your fuel is not the limiting factor, so you can typically run as much boost as you want to max out your turbo/engine/ fuel system.