I bought my 2002 wrx a little more than a year ago. when I bought the car I didn't know much about subarus and was eager to get behind the wheel of a turbocharged car for the first time...(aren't we all). well once I began researching about the car i noticed somethings that were... strange about my car. first off heres a list of what the previous owner had "professionally done by a shop"
turbo back catless exauhst(or so i was told but when i jacked the car up i noticed quickly that it was the stock catted downpipe)
catless up pipe
stage 2 clutch
sti hood scoop
k&n air intake
hks blow off valve
now for the problems that i have realized over the past year.
the car runs rich with out a doubt, black tailpipe, carbon on bumper, backfiring etc. i have been told this many times by friends driving behind me saying they can smell it but i couldn't tell if that was cause theres literally no cats in the car. my question is what can be causing this?
the blow off valve, apparently its a cardinal sin to put a bov on a wrx and rather a bpv should be used because you will be running rich between shifts. now that's all fine and dandy but i don't want to go out and get a bpv and hook it up if the car has been tuned for the bov and there is no need(other than to simply get rid of that childish turbo noise). so how can i tell if it is running rich between shifts and hooking up a bpv wont be a waste of time and money?
there is a quarter sized hole in my turbo inlet pipe.. wtf? howd it get there who knows but i know this must be a problem since its after the maf sensor so i ordered a new inlet hose but my question is if the ding a ling who had the car before me got it tuned with the hole there then is fixing it going to cause even more problems?
the evap system, or the thing behind the power steering, is fubar the solenoid is broken one of the nipple is snapped off and theres a hose that comes from under the intake manifold that is just left open the nipples on the intake manifold are connected by a piece of vacuum line. is this a problem at all? i do get a cel for an evap leak every once in a while and im pretty sure that's why.
also another thing i find weird not really a problem though is that its only running stock boost levels, about 14.7 -15 psi. i find this odd considering the fact that he put a vf39 on why not turn the boost up a bit. but that's not really a concern.
HUGE PROBLEM IMO. when im stuck around 3200- 3700 rpms (going up a hill or something where the car stays at that range for some time) the car jerks bogs accelerates decelerates it feels like the hulk is holding you under the armpits and shaking you forward and backward. i don't know if this is normal for turbochard cars i do know that this is right before full boost tho. basically why does it happen cause i hate it and i have to rip it up every hill i come across reving above 4k just so it doesn't happen.
car has less power at WOT then if i feather with the acceleration. basically if i mash the pedal to the floor i feel like im in a prius until about 5300 rpms then the turbo kicks in and its fine. however if i only press the gas pedal a little and increase pressure as i accelerate the car runs fine and full boost is at about 4k. also if im in neutral and push the pedal to the floor the car takes retardedly long to rev but if i slowly press the accelerator opening the throttle body as the engine speeds up the thing revs fine like i think it should.
also the previous owner told me that the car made 360whp... being that i came from owning a completely stock automatic rsx i believed him but quickly realized 260 seems more reasonable.
any insight on these issues is GREATLY appreciated. i am pretty mechanically inclined so i would like to fix these problems my self. i also would like to avoid having to retune at all costs as i just cant really afford it right now
side note: when i get the turbo inlet i will be checking for boost leaks as i know that this can cause loads of problems