RolanTHUNDER

Then we have the same market cars - Euro DM and yeah all are actually AP1
I think 3.6 is the smallest you can run at 9000 rpm shift limit. consider swapping that pulley out for a slightly larger one. You can use the Vortech site's max impeller speed calculator to determine whether you're overspinning your blower. You enter your shift rpm (9000), pulley size and I think the blower's specific model.

s2000Junky

Based on my rough estimation the 3.6" with the vortec 6" crank pulling is maxing the blower rpm out, but at what exact rpm I do not know. There are different trim levels of the vortec blowers, like the Novi 1220/1200 untis which redline at slightly different rpms 52,000 vs 55,000 for example. With my old set up of the Novi 1200/52,000 limit I maxed it out with a 3.2" at 8350rpm but thats with the smaller 5.45" crank pulley. With a 6" crank pulley you will hit the same blower rpm ceiling with a larger blower pulley, like 3.6" for example. If you can figure out the ratio difference between the 5.45"vs 6" you can nail the blower pulley size with your blowers rev cap. Like I said, its got to be in the 3.6" range, maybe even 3.8" depending on what engine rev limit your target is.

e130dan