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More Boost?
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From: Robertsdale,AL.
More Boost? I have the D1SC supercharger and i want to get more boost into the motor. How do i accomplish this without exceeding the max propeller rpm of the charger? I have forged pistons and yada yada........ I only get abour 8 lbs now. I want about 12-14lbs.
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The max on a D is 62-65000 rpm. Crank pulley divided by s/c pulley x engine rpm x 4.1. Go smaller on the s/c or bigger on the crank and tighten the belt. You should easily get 12 psi @ 6300 rpm.
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From: Robertsdale,AL.
Originally Posted by WAHUSKER
The max on a D is 62-65000 rpm. Crank pulley divided by s/c pulley x engine rpm x 4.1. Go smaller on the s/c or bigger on the crank and tighten the belt. You should easily get 12 psi @ 6300 rpm.
I am wondering if you have your belt tight enough. It needs to be tight as a fiddle string so to speak. You should be able to get at least 13 or more lbs. With the 7.65 and a 3.7 you should be at 57.643 rpm at the blower at 6800 rpm, and 59.339 rpm at 7000rpm. If you went with a 3.4 you would be at 62.730 at 6800 rpm. I would make sure the belt is so tight it will almost twang when you snap it with your finger, and that it is not contaminated with oil or some fluid. You should get more boost than what you are getting with the pulley you have. Check all the rubber for leaks, I would check the whole system, every square inch. I have the 7.25 crank pulley and the 4.00 blower pulley, with the parts in my sig and I have 11lbs at 6800, just as an example. I would check every avenue, before investing in the F1. Then when you have all you can from this one, and are ready for more, get the F1. 
Last edited by BOONE; Oct 19, 2006 at 07:30 AM.
