Sxynerd

Would a 10% I/W overdriven crank give the same boost increase as going from 3.12 pulley down to 2.9RR pulley??

Obviously the O/D crank will keep more wrap on the pulley and you wont have to worry so much about belt slip but is the boost level gains still the same?

Redundant questions i know.

Sxynerd

PS. I hate the new site setup where you can't edit the thread title.

"Overdrive" not Pverdrive

steve0914

yeah but you can edit your post, post *****.... sorry i cant answer your question

lizzyfan

I can

Sxynerd

^Your my HERO!

mustangman281

If your making 15lbs you should be making 18lbs just by adding an overdrive crank.

sstang

Does it add 3 psi to whatever boost your running, or does it vary according to the amount of boost your running?

Also, what would be the benefit of changing the crank pullet over the blower pulley? Faster spool?

mustangman281

The advantage is belt slip control. It allows you to run a bigger s/c pulley and have better belt wrap.

Sxynerd

How do you know if you're getting belt slip if the Dyno graph doesn't fluctuate to show it?

I've never heard of someone getting Belt slip with a 3.12 pulley and I never had any possibility of complaints. I made way more power than I expected back when I had the 3.12 pulley. Is that normal for that pulley or just when dropping to the 2.9 pulley?

SALEEN_TIME

I put that 10% crank pulley on my car and was a great addition, I still have my series 2 on my car with stock upper and Im running almost 10 psi. Love that pulley.