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boost lag problem

A

ahemione

New member
ok so i have a 2000 gtp with 3.4 pulley with supporting mods and some extras and my car is how it sould be until it hits 100 mph then it drops down to half boost....i have replaced my supercharger belt and idler and tensioner pulley i cant figure it out any answers please help thanks
 


Hmmmm what pcm do you have? Sounds like your PCM is pulling boost for some reason. What are you scanning KR and other stuff with? Does it feel like it misses? There has to be other symptoms other than just going to half boost.
 
Stock PCM files that I've seen start pulling boost at 116. It's possible that yours is different, though, pull the lower vac line and unplug the solenoid and see if it changes.
 
im running a zzp pcm and no it doesnt miss i also have new plugs and wires so that shouldnt be it, it pulls hard all the way to 100 then goes to half boost, and it only does it from a 0-100 if i put the throttle down at 75 at 100 the boost wont drop
 
I think kylegtp99 or whatever had the same problem a while back, except his was from 0-95. Maybe he'll see this thread and chip in.
 
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