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Discussion Starter · #1 ·
So i bought a cp-e catted installed over the weekend, we also did the fuel pump internals upgrade at the same time. yesterday a cel popped up that ended up being for the cat warm up efficiency, but i started looking at my fuel trims and noticed that the trim went from fairly normal 5-8% in vacuum to 19% once i got into boost.

looks like i got a bad fp internal kit or something, fuel pressure is great as long as i'm not really into the boost, but when i get on it pressure is dropping below 1000psi in some places. I attached a screenshot from the datalog.
 

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