I am about to get a race gas tune on my LT1 with a D1SC. I currently am making about 11psi 627rwhp on a dynojet. I am just trying to figure out which pulleys to max out the blower around 6500rpm.
Thanks,
Randy

 

D1SC: 4.1 step up and 62,000 max impeller rpm.
(crank pulley diameter/blower pulley diameter)*4.1*engine rpm = impeller rpm
(CP/BP)*4.1*6,500=62,000
CP/BP=62,000/4.1*6.500
CP/BP=62,000/26,650
CP/BP=2.32

Any available combination of pulleys in a ~2.3:1 ratio will work. Were you feeling too lazy to figure this out???

Rich

 

Well I know there are only certain pulley combos available and being such a common blower I am sure someone already has. Just figured it would be easier to ask then do the math and then divide different available pulleys.

 

Pulleys are expensive. Just start with the crank pulley you have and divide the diameter by 2.3 - voila! That is the new size blower pulley you need. Pick the closest, doesn't have to be exact as I am sure you know. A couple thousand impeller rpm north or south will not be an issue.

Rich

 

Thanks. It looks like the 3.4 is available and will be pretty close to maxing it.