I Need help ASAP!

[Tkdteen05]

Ok so before i posted ths i did all my research and tried everything that i find. But my problem still continues. Here is my issue. I am having some boost cut at peak boost. And its only once i am past 4500 RPMs. Ok so now here is a list of engine mods. SR20 bored over .20m w/GT35R turbo. Running 15psi. I read on forums that my spark plug gap might be to big or to check my piping. so i checked it and fixed the to .28" then found that one of my intercooler piping coupler was kinda loose. So i tightened that up as well. And nothing... The problem still remains. Any other ideas as to what it could be guys!!??

[bersh240]

tune?

[biggie]

^And info on injectors, maf, etc.

[Tkdteen05]

^And info on injectors, maf, etc.

Z32 MAF, 550cc injectors, and 255 walboro fuel pump

[bersh240]

but are you tuned for that...?

[Tkdteen05]

but are you tuned for that...?

Yes it is tuned for 15psi. The guy i bought the car is running Nistune on it and thats what he had it set for. And i havent messed with it since. The only other thing i could think of is maybe my boost controller isn't holding boost so its goin over 15psi. And i'm leaning out cuz its not tuned for higher boost. Couldn that be a possibility?

[biggie]

So nothing has changed since it was running fine?

Checked fuel pressure? I can't remember the the boost levelt that 550s max out, its not much more than 15psi though I don't believe.

[Tkdteen05]

So nothing has changed since it was running fine?

Checked fuel pressure? I can't remember the the boost levelt that 550s max out, its not much more than 15psi though I don't believe.

No absolutely nothing has changed. But like I said in my last post I think it might be my boost controller. I don't think it's holding 15psi. It's a cheap hallman one.

[Tkdteen05]

So no one has any ideas as to what it might be?

[biggie]

If the BC isn't holding then you could be leaning out.