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Driver MJM Racing
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851 Posts
Discussion Starter #1
Ok so im trying to buy a F2 Procharger that isnt coming with any cog pulleys and im wondering how do i select the proper size. Was thinking if there is a calculator to figure out the sizes based on Engine RPM so i dont over rev and be at full boost potential.
 

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I'm sure the pros on here have a better method but this is what I came up with:

[((Lower # of teeth / 10) / (upper # of teeth / 10) x (setup) )x(Engine RPM)]

Example:

77T Lower Pulley
48T Upper Pulley
5.4 Step Up Ratio
7400 Engine RPM

((77 / 10)/(48/10)(5.4))(7400)=64102 blower rpms

Would like to hear what others say....see if I'm even in the ballpark.
 

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I divide upper pulley into lower pulley, times max RPM, times step-up ratio.

For example on my Novi: 75/30 X 6000 rpm X 3.54 (step-up)- impeller RPM of 53,100
 

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Driver MJM Racing
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851 Posts
Discussion Starter #5
great
 
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