Bman2000

So got everything installed, made my butt *** ugly power pipe lol. i have a 3.33 pullie on my Si trim v1 so i had a few questions. How quickly are people building boost with stock hci? I ask because ive been flogging it a bit in the lower rpm, and at about 4-4500 i make 6psi WOT, so since its not tuned yet (before you flame me for railing an untuned car, i had it tuned on a dyno with the intent of it making 10psi but turned out my s trim was bad so the tune stayed in the car, but i upgraded the sc. thats why im only flogging low rpm not high yet. my af is safe at 11.5) Back to question at hand, is boost a linear thing? like if i started building boost at 3500, and make 6 psi at 4500 would it be accurate to assume 12psi at 5500? im just trying to get an idea of what ill make, cuz its killing me waiting for this dyno time to roll around. Plus i kinda thought the power pipe and s trim woul make a 3.33 pullie have at least 12psi, and i just dont feel like it would get there with the little tooling around that ive had... Plus im hoping that it pulls way harder above 5k because at 4500 just feels like its ok fast, not real fast. i think im just being deprived of my need for speed right now with this short shift stuff. If anyone can give me insight thatd be great.

89blackonblack

i know this is an old post but did u ever get it on the dyno?

Bman2000

...sort of? lol after i had it rebuilt to si trim, it actually built boost, only made 8.25@6k which seems low for a 3.33 w/ a power pipe and whats supposed to be a 2psi max loss@600hp fmic....but it is what it is. I only put down 337 no timing because i had fuel delivery issues up top, peaked rich at 5300 (10.5afr) when it had been running solid 11.5afr then 5500 fell on its face and leaned out. And i ran out of money, so ive been slowly trying to diag it, but seems the like fuel pressure rail sensor is still good, and the fpdm tested bad, but i dont like how they had me test it so im looking into that more. Ill probably bring it out with some snap on test equipment attached and try to get a better answer. But at this point im sick of this fuel system and im halfway saved for a return style stealth swap from glens