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Boosting 1990-2002 USDM Subarus: A Chronological Guide
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Old 04-08-2012, 06:17 PM   #71
wilz02wrx
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Subscribed... def will be using this soon. Great write up!
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Old 04-15-2012, 08:47 PM   #72
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Just curious... why do you suggest not using a stock wrx turbo? You can boost up to 14lbs, from what I've read, on stock wrx turbo. That seems to be enough for bossting a na subaru
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Old 04-16-2012, 07:58 AM   #73
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It's a heat thing that works against you in two ways. #1 is the discharge heat from the turbo itself. 14lbs of hot air has nothing on 10lbs of cool air. An intercooler helps, but if you stop it at the source then you are much better off. Just because you can do this cheap doesn't mean you can cut corners and do it as cheap as possible. #2 is backpressure in that little turbo. With higher compression, you get higher back pressure which makes that small turbo even more of a choke point. Small turbos are actually a restriction but it takes a really long time to explain why. You'll be happier with a VF turbo or even a 16g/20g.
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Old 04-16-2012, 08:04 AM   #74
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Quote:
Originally Posted by ImprezaRSC View Post
It's a heat thing that works against you in two ways. #1 is the discharge heat from the turbo itself. 14lbs of hot air has nothing on 10lbs of cool air. An intercooler helps, but if you stop it at the source then you are much better off.
This is why I'm going remote mount, and not caring that people are all pissy about it. I'd much rather have 120F air pushing my turbo than 500F air right out of the exhaust manifold.

Sometimes, stepping off the beaten path will get you made fun of, but I don't care, without innovation the world would be boring.
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Old 04-16-2012, 09:07 AM   #75
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Quote:
Originally Posted by ImprezaRSC View Post
It's a heat thing that works against you in two ways. #1 is the discharge heat from the turbo itself. 14lbs of hot air has nothing on 10lbs of cool air. An intercooler helps, but if you stop it at the source then you are much better off. Just because you can do this cheap doesn't mean you can cut corners and do it as cheap as possible. #2 is backpressure in that little turbo. With higher compression, you get higher back pressure which makes that small turbo even more of a choke point. Small turbos are actually a restriction but it takes a really long time to explain why. You'll be happier with a VF turbo or even a 16g/20g.
Ok do I need the sti vf or would I be fine with legacygt turbo? Intercooler wise I hear 06/07 fits best, is that true? Last ? For now, build uppipe, or switch heads to dual port22 heads and knotch out xmember and go with wrx parts?

Will
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Old 04-16-2012, 09:09 AM   #76
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If you have a tube bender make your own system, i fyou have access to a mostly intact turbo engine take everything you need off of it.
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Old 04-16-2012, 03:15 PM   #77
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I don't have any parts yet. This will be my first turbo system from scratch. I've owned and modified 2 wrxs but I think I'm ready for the new learning experience. I'm pretty excited not trying to do things cheap, but am budget conscience. I've also never fabricated an exhaust yet I have a friend with a shop, but not sure if he has a bender or not
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Old 04-16-2012, 03:16 PM   #78
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If not manual mandrel benders on harbor freight and northern tool start at about 200$ and up.
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Old 04-19-2012, 03:38 AM   #79
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Thanks!
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Old 04-19-2012, 07:14 AM   #80
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Np. Making my own exhaust has me kicking myself for not picking up a madrel tube bender. I mean, I'm doing fine without one but I'd have a lot less waste if I had one to use.
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