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3.85 - 4 is about the limit. Kit manu also plays a role because belt wrap varies. Some have success with smaller pulley's but I think its hit/miss. Other thing to consider is LIFE of the belt...
4.5-4.25 will get most people all the power they need on a stock motor, but depends on the specific setup. Don't get caught up in boost #s.
I had a 4.65 on mine when the motor was stock and it made 8#s of boost.
D1 Seems to really be in the sweet spot with a 3.85 with the stock corvette balancer size, but that is really too much for the avg motor. . P1 seems to flow quite a bit less with the same pulley.
Last edited by QuickSilver2002; Mar 18, 2006 at 08:58 PM.
I bought my 02 with a P1 on it a couple of months ago. Since the car came this way I don't know how many pounds its putting out, any ideas? It says 3.85 on the pulley. I have put about 2k miles on it nothing but big smiles so far, not one problem. I made the mistake of driving this car first before I test drove stock ones. No going back now.
I had a Procharger 3.6 but had slippage issues around 5400 rpms. Switched to a Reichard Racing pulley, slippage cured. Im only pushing 10 psi but it so low because of the very efficient h/c package I have on the motor.
Do you guys know what kind of belt lengths your using with the smaller pulleys? I recently purchased a 3.4" pulley and am trying to figure out what belt I need. I have the latest A&A P1SC Package
Things are different up here at 6500" - 7500 " my drive to and from work! but to answer your question.
3.6 Reicherd Pulley AFR 205' comp cam........ got 8PSI with P1
4.0 RR w/D1 nets 8.5 PSI