Join Date: Aug 2007
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Here is the deal. I have an 04 WRX with a Invidia catless TBE exhaust, Invidia V3 down pipe , uppipe, stock intake with K&N drop in and aftermarket top mount intercooler and a VF 34, and the access port, sti pinks, fuel pump.
I am running a PDX tuning mail in map with the mods and the car builds boost fine up to the target boost (18 psi)pressure then drops then builds then drops and then will hold and drop towards redline like it is supposed to. Now I am assume that the car should build and hold the 18psi through the RPM range correct and drop off towards redline..??? I have switched out the wastage boost solenoid and that wasn't the problem. I have tried drilling out the restrictor pill in small steps. When I did this car would boost but would just barely touch target boost and then drop off towards redline. It would hit the target boost at like 5500 rpm for a split second then drop. From 3500-5500 rpm boost would build continuously . I have changed all the vacuum hoses from the turbo to the T fitting and to the wastage solenoid. I am really at a loss of what is causing this issue. With the original pill in the car it spools quickly like 3400 rpm's and performs like it should other then the when the car hits target boost holds for a second then jumps back down and then builds. I should note that this happens in 3rd up to 5th gear. 1st and 2nd are not a problem. Any help would be greatly appreciated. I currently live in Albuquerque and don't know any tuners out in this area where I could take it to get a pro tune and get this problem looked at. I have done all the mods myself with the help of my father so I know things where put back together correctly... Need help!!!
Thanks in advance
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