Boosting problem

[Xtant12]

Hey guys, after having all my stuff installedI was having problems boosting. I thought it was the from the belt slipping but since thatts fix I have no clue what it is. I finally drove the car this weekend and got a chance to nail it to the floor on RT 12 next to a new Vett. I lost but thats not the point..Anyways, my boost stops at about 9. If it hits 10 then it goes down to 9 and wont do anything until I let off. Anyone know what this could be???

Thanks guys...

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[Fish]

What pulley are you running?

 

[Xtant12]

i have a 3.0

 

[phat_ridegt]

3.0 pulley with i/c, headers, rockers...10psi seems a little low, but not outlandish....

i'd just delete the bypass valve to rule that out...but usually that causes boost to sit around 4-5psi

how do you know the belt isn't slipping?

 

[10sec]

Yea not gonna lie that sounds like belt slip to me... 1.8 rockers with a 3.0 i would be happy seeing 11-13psi i saw 13psi with my 3.0 but i didn't have an i/c in the way of the blower, but i also didn't have a ported blower

 

[Mike K]

I don't think that sounds particularly low, especially considering that many are running with their intercooled setups with some pretty sizable vacuum leaks. Do you see any black dust above the supercharger belt area?

 

[TommyGloves]

Add MAP kPa to your scans (it should be pretty consistent) and like Mike said, check the hood for black dust.

 

[Xtant12]

That’s the thing I don’t get. Before I had all the goodies installed I was able to get about 12-13lbs of boost on my 3.2. I know I was told when the headers are installed it flows better so you lose boost but can it be by that much? If anyone else has an intercooler and smaller pulley what boost are you able to get? You guys think my charger could be broken or something??? O and there is no black shavings. its all clean..

 

[Mook]

is your belt sitting in the middle of the sc pulley? check it before you leave in the morning and when you get to your destination, see if the belt moved at all

 

[phat_ridegt]

fwiw, i ran a gen v, w/ 2.55 pulley w/ ic, headers, and cam, and only saw 14-15 psi....yours doesnt seem too out of wack....the ic will drop about 2-3 psi alone

 

[Xtant12]

fwiw, i ran a gen v, w/ 2.55 pulley w/ ic, headers, and cam, and only saw 14-15 psi....yours doesnt seem too out of wack....the ic will drop about 2-3 psi alone

OK.. I didnt know that. That makes me feel better a little bit.. Thanks