Quote:

the ratio is 5.4:1 and is rated to spin 65,000 rpm (impeller speed) F-2 procharger

so you can OD that to 58% if you shift at 7,000
i think.i will check the math again.
http://www.google.com/url?q=http://www.p...wvH2ky4NXKqM0Rw

38lbs and 2700cfm



With a F series Procharger, you can get a step up ratio as high as 6.24:1

Jerry Williams.