how to max out a p1sc
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12-22-2009, 04:44 AM
#3
A 3.4 pulley on the head unit can result in belt slippage due to a lack of belt wrap. I'd use a 3.55 pulley and have a one inch larger oversize crank pulley made for it. Bob
12-22-2009, 08:24 PM
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12-23-2009, 05:40 PM
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12-24-2009, 04:29 AM
#9
Wow, most people with the f body bracket system end up with belt slippage going with anything smaller than a 3.55 pulley. Something doesn't sound right with your set-up, a 3.0 pulley should make a lot more than 9 psi unless your cam has a lot of overlap, or you live up at a very high elevation. Bob
12-24-2009, 04:32 AM
#10
That should do it. Back in the day I had a D-1SC and with the stock 6.0 six rib crank pulley and a 4.0 head unit pulley the car made 7 psi of boost. Swapped out the crank pulley to the MMS crank pulley and the boost went up to 15 psi. Bob
12-25-2009, 02:34 AM
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Wow, most people with the f body bracket system end up with belt slippage going with anything smaller than a 3.55 pulley. Something doesn't sound right with your set-up, a 3.0 pulley should make a lot more than 9 psi unless your cam has a lot of overlap, or you live up at a very high elevation. Bob
12-25-2009, 04:32 AM
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Wow, most people with the f body bracket system end up with belt slippage going with anything smaller than a 3.55 pulley. Something doesn't sound right with your set-up, a 3.0 pulley should make a lot more than 9 psi unless your cam has a lot of overlap, or you live up at a very high elevation. Bob
12-25-2009, 05:57 AM
#13
12-25-2009, 09:39 AM
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You need to spin it pretty good to max it out... I think max is like 62k RPM for the P1.
BTW, I have an MMS crank pulley for sale... $150 shipped...
https://ls1tech.com/forums/lsx-parts...0-shipped.html
...and a 3.2" 6-rib blower pulley for $40 shipped :
https://ls1tech.com/forums/lsx-parts...pped-each.html
I just upgraded to an 8-rib setup.
Cheers,
Rob (Bad30th)
BTW, I have an MMS crank pulley for sale... $150 shipped...
https://ls1tech.com/forums/lsx-parts...0-shipped.html
...and a 3.2" 6-rib blower pulley for $40 shipped :
https://ls1tech.com/forums/lsx-parts...pped-each.html
I just upgraded to an 8-rib setup.
Cheers,
Rob (Bad30th)
12-27-2009, 07:18 AM
#16
I'd check everything out. You can cap off the intercooler tubing at the throttle body, and at the blower, and pressurize the system by installing a schrader valve into one cap. Last year we had a new ProCharger GTO intercooler that was leaking boost at a missed weld, it happens. Bob
