65mm pulley rotrex? custom will the belt rub?

[s4floorin]

Has anyone tried or running a 65mm pulley on there c38 supercharged m3? The belt clearance is very close, so just curious. I understand with this pulley it will be overdriven.

Thanks.

[frankieb96]

Has anyone tried or running a 65mm pulley on there c38 supercharged m3? The belt clearance is very close, so just curious. I understand with this pulley it will be overdriven.

Thanks.

do a larger crank pulley

and please make sure you're tuned for it:idea:

[s4floorin]

according to a.a. switching from the c38-71 trim to the larger 81 trim requires no tuning. yet there is a nice 1psi or so of boost increase with the larger trim s/c. this leads me to believe there is a bit of cushion in the tuning, and it seem to run on the rich side anyways. regardless I will run without tuning for about a month, and than will have it custom dyno tuned by a place in town...

[s4floorin]

anywhere have a larger crank pulley i can just buy? I remember someone doing one a while back, maybe they still have a copy of the cnc file or extras made...