Quote:
Originally Posted by dal1307
The pulley that is normally swapped out on the Stillen kit is the one on the front side of the bracket that is run off of the main belt (via the crank pulley) although I am sure that you can swap any of the 3 pulleys (front side drive pulley, jackshaft pulley or supercharger drive pulley) to get what you are looking for.
The standard pulley that comes with the kit (approximately 8 PSI at sea level) is right at 3.125 inches (I have that one sitting here on my desk). The Stillen replacement pulley that provides around 9 psi of boost at sea level is right at 2.9 inches (that one is on my car now).
I am thinking of swapping it out for something around 2.5 inches as I am at 5400 feet ASL here in the Denver area and am only able to make 7.2 PSI out of the 9 PSI puley. As you stated, Vortech has a good selection of replacement pulleys and 928 Motorsports also makes a nice selection of replacement pulleys.
Good luck and I hope that you have the same good experience that I have had. The custom tune is definitely the way to go.
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The Stillen kit uses a 7 rib pulley set up vortech only sells a 7 rib 3.12 pulley thats it. If you look on there site as well as 928 motorsports you will find 6,8,and 10th pulleys. I think you would be better off going with a cog pulley set up on the back ,or a larger crank pulley instead of smaller pulley than the Stillen one. If you go smaller than you are asking for belt slippage problems.