ProjecT 9

iTrader: (6)

Anyone know what a 4.0 pulley will net me, boost wise on a T-Trim? 8 Rib setup, A&A Kit...

Thanks,
Jon

DeltaT

iTrader: (5)

What size is your lower and engine? 4" is a pretty big pulley for a Vortech. I'm getting ~12.5# out of my T-trim on a 383 with a 7" lower and 2.95" upper pulley, big FMIC.

Jim

ProjecT 9

iTrader: (6)

Your asking about the crank pulley correct? 8" crank pulley and its a stock 346.

2001WS6Vert

4" doesn't sound right. 3.15 would be the most conservative pulley i would consider. A 2.75 would probably get you to the 13-15 range.

ProjecT 9

iTrader: (6)

I'll just have to ask Andy tomorrow.

ls1290

iTrader: (20)

+1

Keith

DeltaT

iTrader: (5)

Yep, my pulley ratio (7/2.95) is 2.34. With an 8" lower and 4" upper, yours would be 2.0, which is low for the T-trim. The 3.15 would get you to a 2.53 ratio which should be perfect for a 346 pulling all the way to 6700-7000 rpm. Max rated rpm is 55K on them, but Vortech said (unofficially) that occasional blasts up to 10% over redline would not hurt the unit.

Jim