boost???
Thread Starter
Teching In
Joined: Dec 2006
Posts: 35
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From: michigan
boost??? i have a p1sc now with a 3.20 pully at 4.8 #of boost on stock bottom.. wanting to go to a d1sc.. how much boost and hp will a 4.50 pully make and how much boost is still safe???? 
TECH Resident
Joined: Oct 2005
Posts: 787
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Why don't you consider just upgrading to the 8-rib drive setup? With the 8 rib drive you'll get a 7.65" crank pulley vs. the 5.82" you have now. You will then be able to spin the P1SC much higher for more power.
Personally I consider 8 psi the limit for the cast piston shortblock on pump gas. Others has gotten away with more, for a while.
Personally I consider 8 psi the limit for the cast piston shortblock on pump gas. Others has gotten away with more, for a while.
going from a 3.2 to a 4.5 is going to lower your boost and thus power. You need to go the other way. Also, it sounds like your bleeding off boost or major belt slipping. A P1 with a 3.2 pulley should make way more than 4.8#s.
