Originally Posted by
thermal
Well, B20's are thin walled... However, 250whp is not really that hard to achieve. For $3k, I say look into an SC61/GT35 or atleast a 57 trim T3T4. Get you a decent turbo manifold tho. InlinePro makes good stuff or find you a ramhorn made by a reputable fabricator at Honda-tech.
Given the title of this thread "B20VTEC", what VTEC head are you gonna use? Here are some useful info that you might like:
Out of curiousity, is that the intake flow, or the exhaust flow?
My personal feelings, are that a turbo couldn't care much (it matters, but not so much) about the intake side. The exhaust side controls potential horsepower, but must be balanced with spool considerations.
You can do 250 hp on fairly low boost with the Sc61 or GT35 series, but those turbos are optimal for 400-600 hp applications.
I've recently noticed the Treadstone T3/T04E 50 trim. Looked good for low-boost. Stage2 T3 exhaust side, with a .48 A/R exhaust housing. They dynosim says it should provide very good mid-range power comparatively, and meet the goal he's looking at 10 psi or less. Granted I don't have as much experience, but I feel that would be a reasonable, and economical route.