Just did a rebuild and installed a single turbo... The engine seems ok and everything but the vaccum at idle seems a little low..it shows around -298 to -350 mmhg on thePowerfc i think...if i let it idle for a while it keeps building vaccum and goes to around 400+...



I have all the twin turbo vaccums blocked now... i mean the ones that need to be blocked... is it a vaccum leak??



thanks

 

just one thought...

the pfc with the stock map sensor is not the most accurate... I have seen some read up to -40 mm/hg when the car is off. So do you have a good accurate boost gauge? Also did you port the motor at all? that can affect vaccuum.



Bob