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Old 01-04-2021, 07:01 PM   #27
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Member#: 328635
Join Date: Aug 2012
Chapter/Region: NWIC
Location: Portland*
2004 STi GTX3076R
Rally Blue


Originally Posted by snow_bound26 View Post
From everything I've read, the 3576 is the better of the 2 at that size. The big thing to remember is you want to make the turbo work at an efficiency range where it generates less heat and the larger turbine will help a lot especially at higher RPMs. Talk to Chris at Killer B and I bet he will recommend that turbo.
Don't need to bug Chris on that one, he has like 100 posts pointing that out through a bunch of threads that lead up to someone asking his opinion and him re confirming that as his favorite street application turbo. He is not a fan of the gen 2 3076 as for his testing it spooled the same as the 3576 but made less whp. He will say get a 3071, 3576 or the 3582 (if its just a track beast).

Op, I wanted to build a de-stroker for my car given it lives over 4k rpm so it would lend well to my uses. I didn't for a few simple reasons.

1) When parts are correctly matched a 2.5L can and will make power up into the 8,500rpm range (mine does from 4,000-8,500 on 272 cams).

2) There are some small very specific things that are done to make a 2.3L work perfectly and the knowledge is less commonly known. Most any machine shop can Hellen Keller thier way through a 2.5L build and have good results.

3) They tune differently due to the nature of them, my tuner has seen more 2.5L's then there are 2.3L's in existence.

However, if I didn't have a machine shop I like or a tuner I am unwilling to leave I would have a 2.3L and would have contacted the people that have the experience with them (you appear on the right track with that part).
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Scuby04STi is offline   Reply With Quote