Maxing out a turbo.....
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Maxing out a turbo..... I think I have pushed the limits on my TT setup with the GT3076R's.
Stock long block = 810rwhp @ 21psi of boost. Would not make anymore.
Sound about right?
Stock long block = 810rwhp @ 21psi of boost. Would not make anymore.
Sound about right?
That sounds about right to me. GT30 are good for about 400 to 450 maxed out on a smaller 4 cyl where back pressure is not an issue.
Thats around what the upgraded Incon kits made on f-bodies which also used those turbos.
Thats around what the upgraded Incon kits made on f-bodies which also used those turbos.
I dunno, I've got a buddy with an integra at 16psi putting down 500whp on a 30r. That's at a pressure ratio of around 2.2, which isn't quite the compressor's peak.
Unless the cam is too big or your exhaust housings are too small, you should be good to around 1000hp or so.
Unless the cam is too big or your exhaust housings are too small, you should be good to around 1000hp or so.
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Might be the exhaust housing. Those are $455 each! Still running the stock cat back but don't think that would cause that much of a issue.
I sent Garrett a full wrap up of my car with pics vids etc. hoping they contact me back. Either way 810rwhp on a stock long block is impressive.
I sent Garrett a full wrap up of my car with pics vids etc. hoping they contact me back. Either way 810rwhp on a stock long block is impressive.
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Generally excess backpressure post-turbo causes problems with actually making boost because of the lack of pressure differential across the turbine. But at 21psi I don't think you're having that problem. What are the specs on your blower cam?
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Verdad Gallardo 500whp at only 16psi sounds awful high to me. Most using that turbo push 25 psi to hit 450whp on a built Evo. The turbo is only rated to 500hp by Garrett and that's at the crank. Are you sure your not thinking of the GT35r?
My first new car I bought in 98 was an Eclipse GSX followed by a new STI when they came out. I also owned an Evo. This turbo is used sparingly in both those communities and takes much more than 16 psi to hit 450whp on those platforms and very few do. Most just skip to the 35r or fp green or red.
My first new car I bought in 98 was an Eclipse GSX followed by a new STI when they came out. I also owned an Evo. This turbo is used sparingly in both those communities and takes much more than 16 psi to hit 450whp on those platforms and very few do. Most just skip to the 35r or fp green or red.
Last edited by big reg; Aug 9, 2013 at 02:03 AM.
500whp at only 16psi sounds awful high to me. Most using that turbo push 25 psi to hit 450whp on a built Evo. The turbo is only rated to 500hp by Garrett and that's at the crank. Are you sure your not thinking of the GT35r?
My first new car I bought in 98 was an Eclipse GSX followed by a new STI when they came out. I also owned an Evo. This turbo is used sparingly in both those communities and takes much more than 16 psi to hit 450whp on those platforms and very few do. Most just skip to the 35r or fp green or red.
My first new car I bought in 98 was an Eclipse GSX followed by a new STI when they came out. I also owned an Evo. This turbo is used sparingly in both those communities and takes much more than 16 psi to hit 450whp on those platforms and very few do. Most just skip to the 35r or fp green or red.
You cam manipulate dyno numbers all day. theirs a vid on here with a stock import that made 130rwhp on the irst pull then at the end of 5 pulls made over 600rwhp changing settings on the dyno very lil. no mods to the car
Might be the exhaust housing. Those are $455 each! Still running the stock cat back but don't think that would cause that much of a issue.
I sent Garrett a full wrap up of my car with pics vids etc. hoping they contact me back. Either way 810rwhp on a stock long block is impressive.
I sent Garrett a full wrap up of my car with pics vids etc. hoping they contact me back. Either way 810rwhp on a stock long block is impressive.
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My numbers are not off. It could be higher. Keep in mind my make timing is 16......
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I'd say you maybe arent far off the limit.
Smaller engines will make more power, and will do 500, but dont forget they are using much higher boost to do so.
Most V8 applications seem less happy or willing to push 30psi etc to achieve the goals.
Running such boost on a 4cyl is just routine. So the larger engine will always fall on a different part of the compressor map.
That said, a friend here in the UK has a couple of billet GT30's on his flat 6 Subaru and with a little gas is trapping 178mph lol
Although that car is at the extreme end of things.
Smaller engines will make more power, and will do 500, but dont forget they are using much higher boost to do so.
Most V8 applications seem less happy or willing to push 30psi etc to achieve the goals.
Running such boost on a 4cyl is just routine. So the larger engine will always fall on a different part of the compressor map.
That said, a friend here in the UK has a couple of billet GT30's on his flat 6 Subaru and with a little gas is trapping 178mph lol
Although that car is at the extreme end of things.
Nothing wrong with going to some bigger turbos 
17psi on my LQ4 from twin GT35Rs made over 900whp. If you're itching for more power and some lower IATs, some turbo upgrades may be the way to go.
17psi on my LQ4 from twin GT35Rs made over 900whp. If you're itching for more power and some lower IATs, some turbo upgrades may be the way to go. 