fueling issues

[btustison]

The dyno proves what my *** has been telling me... I have a flat spot in my power curve right around 4000 rpm. I know this isn't right, but has anyone else run into this problem? I plan on putting a bung in my O2 pipe and doing some wideband runs on tuesday, but from what I can tell right now it is dumping fuel at that point and then just burning off the fuel as I rev higher. I am running 10psi on the stock turbo (going bad if anyone has an S14 turbo with a boost up ecu, ARC sidemount, and cat back exhaust.All I can think of right now is that my ECU has a crappy chip, MAF is haywire, or the injectors are maxing out. What do you guys think?

[float_6969]

Hmmm, what are you doing with the butterfly's? That is around where they turn on/off. I think the first step is to follow what you're planning and get a wideband on there and see what's going on with the A/F ratio's. I really don't think your maxing the injectors or MAF out, but I think boost cut is at 11psi, perhapse you're getting a little close to it. Also, do you have the knock sensor hooked up?

Sidenote: Lemme know if you pull your turbo, I"m looking for a blown stock CA turbo.