My second 2002 WRX. I bought it used. STi v7 shortblock, TurboXS FMIC, Power Enterprise Radiator, TurboXS Dual Stage MBC, IHI VF-22, HKS BOV, UTEC.. a bunch of other stuff, but I think that's all that's relevant to this thread.
When I picked up the car it was misfiring on all four cylinders and basically had no oil in it. The misfire was because of a map that was way too aggressive, I've since fixed that (and added oil).
Car ran good for the first day. I wanted to see what the boost was set at on the second stage (first stage was hitting 18-19psi in fourth gear). So I went WOT in 4th and flipped the switch on the controller. I felt a little push, but the the car immediately started cutting out. I let off and figured it was hitting boost cut. But then it started cutting out on the first stage of the MBC. I can see the boost gauge jumping whenever it's cutting out. It's almost like air is escaping from the system somewhere.
I took the car to my guy here at home and we tinkered with it. Compression test, changed plugs, etc. But it's still cutting out with the boost set at anything over 14psi. If I keep it turned down to 14psi you would never know anything's wrong. But obviously with a VF-22 I should be able to push more than just 14psi.
My tuner here was saying the next thing he wants to try is updating the firmware on the UTEC and retuning it. Which I've been wanting to do anyway, but I don't think this is the problem I'm having with boost since it ran fine when I first got it. All up until I tried the second boost setting..
I would like to get all the problems sorted out and everything set up how I want it before I have the UTEC flashed.
I did find a plastic T-joint (pictured below) that was cracked and allowing air to escape. I replaced it hoping that was what's causing my problems, but it didn't change anything.
I've thought about taking everything apart between the turbo and throttle body, cleaning, then reassemble it all to see if there might be a leak somewhere.
Also, there appears to be a mount missing on the hot side of the IC tubing where it can attach to the intake manifold (also pictured below). The tubing obviously moves because it has been rubbing on the underside of the hood and I have duct taped it to keep from wearing a hole in the tube. I'm wondering if I could get this mount from TurboXS.