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Originally Posted by justaddwater
thanks for the smart ass comments, i'm sure they'll help. in all of the original posts no one cared to mention anything about an exhaust or intake affecting fuel ratios. so as it stands right now the sti has a cold air intake from aem and a turbo xs turbo back. when i posted more power, i did not base this on dyno numbers, just on compairing stock acceleration to current. the boost controller has not been installed, this is why i posted was to have a question about boost and engine managment answered.
so now i ask you to explain yourselves: HOW DOES AN INTAKE AND EXHAUST AFFECT ENGINE MANAGMENT TO THE POINT OF ENGINE FAILURE.
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You got smart ass comments because 3 people told you turning up the boost is a bad idea w/o going to full engine management, and in your next post you tell us the MBC is on the way.
And, you're clearly still not reading (or not understanding) the posted suggestions. Cody pretty clearly explained why a CAI will hurt the car. If you cram more air into the motor without the propper amount of fuel, you blow it up. At altitude you can fudge it a bit, since there's less air to begin with, but and CAI that "adds power" on a turbo Subaru is doing it by leaning out the mixture.
And on an STI, high flow exhausts cause boost creep because most STIs don't flow enough through the wastegate, which leads to overboosting and fuel-cut... which are again bad for the motor. Boost creep can be controlled to a point with tuning, but the real solution is a ported wastegate.
These are all topics that have been covered on this board, and on the larger boards (NASIOC and I-Club) ad nauseum.
And from experience (I ran a MBC in conjunction w/ a UniChip back in the day) manual boost controllers kinda suck. The stock boost solenoid does a great job smoothing out the power delivery... a MBC makes the car lurch all over the place, as the boost is not applied smoothly. Plus, MBC's drift their target boost with weather changes. In the winter, I had mine cranked all the way down, and would still overboost.
I get the impression you haven't done much research about available tuning options. Do you have a boost gauge and EGT sensor coming w/ that MBC? How are you going to know what the controller is set to? How are you going to know when the car is dangerously lean from a full-boost partial-throttle condition... do you even know what the FBPT problem is?
My advice is to un-bunch your panties and do some research. There's a buttload of info here and on the rest of the 'net regarding what works and what doesn't on Subaru motors. These things *are not* DSMs. What works on an Eclipse breaks a Subaru. Do some background research, then pick our brains with some pointed questions, we'll be happy to help, and we'll leave the smart-ass comments at home.
Otherwise, I've got a busted EJ20 short block I'll sell you... maybe between my broken motor and your broken motor, you can cobble a working engine together.