New Rotrex C38R Supercharger

tiller · 03-17-2019, 06:00 PM

Quote:

Originally Posted by jefftang04

Hope this helps

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You said you made your own sc pulleys, roughly how many mm, 90? Cuz 85mm would max it out also, we figured that to be roughly 18lbs of boost, how many lbs will you be on the dyno?

jefftang04 · 03-17-2019, 08:42 PM

Quote:

Originally Posted by tiller

You said you made your own sc pulleys, roughly how many mm, 90? Cuz 85mm would max it out also, we figured that to be roughly 18lbs of boost, how many lbs will you be on the dyno?

Hi, The new C38R has a different ratio (6:1) as compared to C38-91 (7.5:1). Hence C38R will require a smaller pulley to achieve the same impeller speed. Im currently on 82mm pulley. This will give my 80k SC rpm at 7500 engine rpm. For it to achieve 90k SC rpm, the pulley will have to be 73mm, which is a bit smaller than what rotrex recommend as the smallest allowable pulley size.

I have yet to dyno the car yet. will keep you guys updated.

Thanks

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