I'm currently seeing 5# of boost with the Vortech stock pulleys (3.33/6.87). I would like to get 10-12# of boost. I have lying around a 2.95 pulley but I'm afraid I'll overspin the blower in the 1/4 mile. Vortech states that the maximum impeller speed is 50,000 rpm's and at the end of the 1/4 mile the supercharger would be spinning at 52,817.49 rpm's. If I go with the 3.12/7 the impeller speed would be around 50884.62. Should I keep the 2.95/6.87 or go with a 3.12/7? Where can I get the 3.12/7?
1995 Mustang GT Rio Red with red and black leather interior (1 of 20 made by Ford), Vortech Supercharger, UPR powerpipe, Edelbrock 6037 heads, C6 transmission, 3000 RPM 9" torque converter, Bassani Offroad complete exhaust system, 1.7 roller rockers, 3.73 gears, Holley Systemax I lower intake, Cartech Box Upper intake, 65mm TB, Pro-M 80mm MAF, 42lbs injectors, UPR Power Pipe, Tweecer, and some other stuff...
Loose belt
Stock Blocks are Unbreakable
Yeah it sounds like the belt is a little loose. Tighten it up and see what happens. Don't worry about overspinning it, no-one else does and they really don't have any problems. but i'd try to tighten it up cause it sounds like you're about 2-3# down unless you live in high elevation.
89 Coupe with parts stacked inside of it and about 30#'s of dust on it with no end in sight. :weird:
Although I am collecting parts for a 12.5:1 393 :D
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