i used to get 12 to 13 psi now i get 10 to 11 psi.the mods i got done to my car are intake, stage 1, and exhaust. anybody have any idea what could be wrong?

 

what size of exhaust?

 

how hot is it outside.

 

which way is your car facing?

 

i got a gm catback performance exhaust and it was between 80 and 90 degrees

 

hmm well they might have messed up the tune I would take it back to the dealer and tell them

 

you will lose boost with a higher flowing exhaust.

 

it just started doing it though

 

what was the lst mod you did and how long ago?

 

heat also has something to do with it.

also if the air temps after the blower get too high, it lowers timing and boost.

 

loosing boost is a good thing that happens after an exhaust, it happens because your exhaust is now more free flowing I'd say it's good but does the car feel any slower or any cels?

 

the first mod was my intake and its a k&n and i put it on about 5 months ago

no the car doesnt feel any slower and no cel's

 

i lost boost when my clutch was going out.

 

my clutch feels fine

 

then your car is happy my boost guage did the same **** to when i put on my exhaust just enjoy the new parts.

 

so then its normal nothing is wrong with the car

 

How is that? I thought boost was an intake pressure measurment. I do not think that you should loose boost with exhaust upgrade... I didn't. and I am running a full 3" from the block to the tailpipe.

I can see loosing boost with a more restrictive intake, but better flowing exhaust?

 

Less restriction (coming from lncreasing pipe diameter) causes the supercharger to flow the same cfm but with less restriction (boost is a measure of restriction).

 

might have a boost leak.. check the hose that goes betwen the blower and the motor. the same thing happened to me and that was the problem