[hammdo]

So, here is my ratio for my pulley combo:

9.17 (18%) lower
2.45 upper

9.17 / 2.45 = 3.74 (ratio)

Now, to find the blower speed (at what we think will be max HP rpm)

3.74 * 6300 (yes, it can goto 6800 or a max 7200 RPM), but this will be where I'll be driving it max...

So, the blower will be spinning @ 23,562 RPMs @ 6300 RPM.

@ 6800 Engine RPM, we'll be spinning @ 25,432 RPMs -- that is moving that blower! Good thing I got a rebuild with porting...still in the safe range from Weapon-X

Now, with the breathing we've taken into account, this should still breath very well. I'll need to manage the heat in the blower -- we'll see how that goes, but, very nice indeed...

Edit:
Road racing I'll see about 5800 RPM so;

3.74 * 5800 = 21,692 RPMs

So, keeping things under 6300 RPM with my combo will still be safe...

-Don