supersexycobalt

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?

SmOKe JeNsOn

what size of exhaust?

Area47

how hot is it outside.

SmOKe JeNsOn

which way is your car facing?

supersexycobalt

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

SmOKe JeNsOn

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

Area47

you will lose boost with a higher flowing exhaust.

supersexycobalt

it just started doing it though

SmOKe JeNsOn

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

Area47

heat also has something to do with it.

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

glockglade

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?

supersexycobalt

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

postal_ss

i lost boost when my clutch was going out.

supersexycobalt

my clutch feels fine

glockglade

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

supersexycobalt

so then its normal nothing is wrong with the car

NVMYCOBALTSS

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?

glockglade

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).

MadboostSS

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