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not getting full boost

0

02grandprixgtp

New member
so when im at wot my factory boost gauge will flicker back and forth from having full bars to one and two less what could cause that i just changed the supercharger oil would that have anything to do with it
 


Sounds like the boost control solenoid (BCS.) The BCS connects to the supercharger boost bypass valve on the side of the SC. If you disconnect the vacuum hose between the solenoid and the BBV and drive it you should get full bars on the legometer at WOT.
 
did you use a real boost gauge or just the lego blocks on the dash board alot of times they dont go full boost and can have a vac/boost leak to the map sensor or if it is like my case somehow after 232,000 miles my sc wasnt putting full boost anymore would go about 2 bars off from full and sometime hit full on a cold day so i replaced it with a p&p one and it works great now hits full boost at half throttle with the new 3.35 pulley
 
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