RiderofDragon

Have a D1 procharger with a 4.75 pulley. Stock motor, stock manifolds, Borla catback. Car only makes 4lbs boost with this pulley. What size pulley will I need to get it to make the 8lbs it was supposed to make? Any info would be appreciated

2000silverbullet

iTrader: (5)

Do you have a 6 rib set up or 8 rib set up?
Any belt dust?
What size crank pulley?

Brent@LPE

thats a big pulley dude, usually with a 4.5 on bone stock we will see 7# by 5000 you should be able to run a 4.25 with good tuning and get upwards of 450 hp..

618HAWK

iTrader: (361)

I can tell you this, if you have a 8 rib and a 7&5/8 crank pulley I would go with at least a 3.8 or 3.7. Iam running a 3.7 and see a good 8 to 9 psi.

Cant say much for a 6 rib and drive.

RiderofDragon

It is an eight rib set up with a 7 5/8 crank pulley and I see no signs of belt slip