WHAT pro charger pulley?

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Apr 8, 2015 | 08:11 AM

antonzracin

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WHAT pro charger pulley?

Hi all,

I have a disc on my 99 camaro...all forged internals, stock block/crank....

Im currently making 10lbs of boost....what pulley do I need to get into the 12lb range. Im very green to this stuff, not sure what is on there now...its whatever the kit came with...thanks for any tips on what size pulley i need....also a lnk to a vendor would be appreciated, thanks again.

Apr 8, 2015 | 08:42 AM

Mike 02T/A

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Call Bob @ Brute Speed.
A decent setup should only need 1 size smaller for 2 pounds.

Apr 8, 2015 | 09:35 AM

JoeMama's GTO

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Either measure what size pulley is on there now or look for the size marking on the pulley. Rule of thumb is 1 pound for every .125" smaller but I have seen this not be quite on target. Also, need to know if the balancer pulley is stock size or not and what your redline RPM is. This information is important to make sure you do not overspin the headunit.

Apr 8, 2015 | 10:34 AM

scottywheels

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Like others said, need to know sized of crank and blower pulley and what you are spinning the motor to. There is not direct link to pulley A making said number of lbs of boost. There are to many variables.

Apr 9, 2015 | 06:22 AM

Bob@BruteSpeed

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Quote:

Originally Posted by Mike 02T/A

Call Bob @ Brute Speed.
A decent setup should only need 1 size smaller for 2 pounds.

Thanks Mike, I appreciate it! Bob

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Apr 9, 2015 | 06:25 AM

Bob@BruteSpeed

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Quote:

Originally Posted by antonzracin

http://shop.brutespeed.com/ATI-DPxxx...-ATI-DPxxx.htm
Here is a link to the pulleys and belts

How much boost the blower can produce depends on many variables.
* Cubic inch. The larger the engine the less boost it will make with a supercharger.
* Headers and exhaust. A better flowing system will produce less boost, requires a smaller pulley to regain the loss in boost. Ultimately though, more power will be gained.
* Camshaft and heads. A camshaft with some overlap will leak out some boost through the valves. Better flowing heads react a lot like a better flowing exhaust system.
* Altitude. Elevation plays a big part in how much boost is produced. Those people living in the higher elevations have to spin the blower harder to see boost.
* Condition of engine. An engine with real good sealing rings will ultimately produce more boost than one with worn rings.
* Rpm. An engine that is spun up higher in the rpm range will normally produce more boost.

To determine the impeller speed, the following formula is used:

Maximum impeller speed = crankshaft pulley diameter (N1) divided by supercharger pulley diameter (N2),multiplied by the step-up ratio (4.10 for the P-series/D series - 5.40 for the F series), multiplied by engine rpm at redline.

Max rpm with a D-1SC is 62,000 rpm.
8 rib ProCharger crank pulley is 7.65 diameter. Bob

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