8psi Procharger making 5psi??

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Jul 8, 2006 | 03:07 AM

chaplainracer

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8psi Procharger making 5psi??

I installed a boost gauge and my 8PSI P-1SC procharger is only registering 5-5.5 psi. What is the deal? Has any one else had this issue?

Jul 8, 2006 | 04:14 AM

newb2000GT

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RE: 8psi Procharger making 5psi??

At what RPM? Near redline?

Jul 8, 2006 | 11:46 AM

chaplainracer

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RE: 8psi Procharger making 5psi??

Yes. WOT at around 5500 RPM. I am not sure if advertised PSI is the same as actual PSI once it runs through the intercooler.

Jul 8, 2006 | 12:40 PM

nanaki

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RE: 8psi Procharger making 5psi??

an intercooler is going to cut off about 2psi. so if you have an 8 pound pulley, you're only going to get about 5-6. get a smaller pulley.

Jul 8, 2006 | 05:32 PM

chaplainracer

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RE: 8psi Procharger making 5psi??

I ordered a 10LB pulley. Now I wonder if I should have went with a 12LB.

Jul 8, 2006 | 08:11 PM

LvGordo

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RE: 8psi Procharger making 5psi??

what other mods? sometimes mods can rob some boost.

Jul 8, 2006 | 09:33 PM

chaplainracer

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RE: 8psi Procharger making 5psi??

Mods are limited to Longtubes, o/r X pipe, and cat back.

Jul 10, 2006 | 02:41 AM

newb2000GT

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RE: 8psi Procharger making 5psi??

Quote:

ORIGINAL: nanaki

an intercooler is going to cut off about 2psi. so if you have an 8 pound pulley, you're only going to get about 5-6. get a smaller pulley.

I'm intercooled and make just barely over 8 on my boost gauge near redline. Does that mean I might have a 10 psi pulley? That might explain why I make a little more to the wheels than others running 8 psi.

Does anyone know the dimension of the 8 psi ProCharger pulley?

Jul 10, 2006 | 12:00 PM

QuickShortBus

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RE: 8psi Procharger making 5psi??

Quote:

ORIGINAL: chaplainracer
Mods are limited to Longtubes, o/r X pipe, and cat back.

Any mod that lowers the air restriction into and out of the motor will cause lower boost readings, long tube headers are a big help in that department. Therefore you will see a lower boost reading. If you have a true 8lb pulley and nothing else is wrong, your s/c is forcing the same amount of air into your engine as it would on a completely stock car at 8psi because boost is only a measure of restriction not airflow.