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...
hmm vortech suggested that pulley set up for my car and never mentioned a word about over spinning it. Id say with a 8" crank and 2.95 youd be closer to over spinning it. Id like to hear what others ahve to say as well on this
1990 GT Convertible
No issues as you really won't even be over spinning it as the serp will have belt slip.
I have spun my T ~65,000 rpm's or 10,000 over on a serp setup.
Main issue is ineffeciency. If you have cogs on it then you really don't want to go over.
You will be fine.
351 "stockshort block": -Vortech T-trim (21 psi), Trick Flow Heads, Lunati Cam, Weldon fuel system, Lentech AOD., 3.55 gears, 27" Hoosier QTP's, 3500# with me
-545 rwhp
-10.02 @ 135mph---Is 9.99 to much to ask?:freaks:
-1.42-- 60'
Originally Posted by regattacoupe
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