ss4luck

So im about to order a 3.4 for my V3SI and i was messing around on the vortech site with their impeller calculator and am a bit confused.

They say the V3 can handle 52K RPM, but their calculator says that a 7.5" crank pulley, 6300 RPM (shift point) and a 3.4 is 50K and that on paper we could go down to a 3.25 and be at 52300.

For us out there that wanna run these to the limit why dont you see more people with a 3.25? Would i be creating an issue going down that small? Im still on a 6 rib setup and figured that belt wrap/slip might be an issue and thats why the 3.4 is popular.


I plan on adding a second meth nozzle, new pulley and a retune for 91 (coming from a 93 tune after living in MI) and just figured if th 3.25 will work i only wanna do this once


opinions?

C5Natie

Yup, belt slip will be your main issue with a 3.25 6 rib pulley. A direct drive and 8 rib setup would solve that and leave room for future upgrades.

hatewhatownsyou

I have a one I'll sell you if interested, $90 shipped.

a&a pulley with less than 2k miles on it.

neverstop

I believe guys have made 750whp+ on 6 rib with old style direct drive but I'd call A&A to see what they say

Robert 2000

I run a 3.33 and an overdriven balancer on my V2 Si trim. The calculator shows something like 56k rpm at 6500 rpm for the shift. I did the 10 rib and flipdrive with plans of a ysi later on. I was on stock balancer and 3.4 before which felt fine I do prefer the current setup of course.

ss4luck

If i could go to an overdrive balancer i would in a heart beat. Im builting a TT 427 for the car that should be done in spring so i dont wanna tear too far into the current setup.