Ls1toAMG

I know it has been discussed. I have done searches. I know you can't take much off. But does anyone know how many mm you can take off?? I'm sure Shardul and others have experience or knowledge of this. I'm looking for 15hp yet keeping stock pulley and springs. I have read 1mm=.2 lbs of boost. 1 in of boost ='14 hp. That's pretty true for crank pulley but not so for supercharger pulleys.
In the defense of that statement I will use the gains reported for the 84mm clutched pulley and 83 mm fixed. In theory they are only 6-7 mm smaller than stock. Yet produce double what the above formula.

So if you get the OEM pulley down to 87 mm couldn't you get 15 hp fairly safely???

uraberg

I would say that if a 83mm can be made with the same bearing, then the oem can be turned down to that same size.

sircl55amg

i did a test...its possible to go at 84mm,but you need to ( fill - weld) the inside groove in the pulley

Ls1toAMG

I had around 86'mm in mind. With 86'and a tune I'm looking for around 35- 40 hp.