I'm currently running a Greddy S/C on an 06 xB and was hoping there would be some after-aftermarket support for an upgraded pulley. According to the crappy Glowshift boost guage I currently have, boost maxes at 8 psi, though it holds mostly at 6 psi unless the accelerator is pressed down > 75%.

Does a higer performance pulley exist, either on the supercharger or alternator side, for this kit? Would Greddy have one, possibly Eaton, or an aluminum CNC shop maybe?

If I went a custom route, does anyone have calculations available for pulley diameter vs. pressure? That way i could just send out the diameter needed and possibly have one one-offed.

With eManage my AFR is a dead flat 11.6 across the power band on upgraded injectors, barring overpressure of the cylinders I'm guessing 10-12 psi could be ran on stock internals on 93 octane. I could always go meth injection if needed as well for the octane boost.

I was also thinking about a possible swap of the M45 with an Eaton TVS R530, though it would not be a direct form-fit replacement.

Cost-wise, if it's too much to mod the Greddy I'll end up going with a turbo, was hoping to work with what I had first though.

 

The Greddy kit uses and Eaton MP45 supercharger. This same supercharger is the factory one on the Mini Cooper S. The Mini runs 11.75 psi from the factory, so changing to the factory Mini pulley would essentially equal that on the Greddy kit. But you would have to find out what the crank pulley diameter is on the Mini is too. Because that determines the drive ratio. You could possibly call eaton to find out the ratio to get the boost you want. There are also aftermaket pulleys for the Mini that put it up to 14 psi, but I don't think you would want to run that high on a stock lower end. Unless you want to be our guinea pig.

 

Try working with this company. http://www.pulleyboys.com/

 

optimize the car for flow.

Smooth out and widen the diameter of the intake....

Header, then rest of exhaust including hi-flow cat, back in 2.25"



THEN... get a camcon and play with the intake cam timing to retard it so that it opens earlier and has less overlap....


You will make the same or LESS boost at redline... but have WAY less stress on your motor... AND make more power.


Boost is a measure of restriction.
CFM is a measure of the volume of air... you want CFM and flow...


Do it, and you'll love the driveability and reliability.