Vortech V-2 SQ
Le Mans Master
Joined: Dec 2005
Posts: 8,475
Likes: 332
From: Port Arthur, Texas 77642
If you are installing A&A Vortech, I believe the 3.8" pulley would be the one to use. I would ask Andy to be sure. I run 3.6" pulley on my 99 LS1 with AFR 205's, blower cam, LT's, and at 6600 rpm I see 8-9 psi. Possibly 9-10psi, it's hard to read a gauge while trying to drive & shift gears because the engine revs so quickly. Good Luck with your install. Have a Merry Christmas and a Happy New Year 
Scotty
Scotty
Safety Car
Joined: Jun 2004
Posts: 4,353
Likes: 22
From: Bella Vista Ca
My S trim gives 10lbs with the 3.6 pulley at 6500 (stock internals with headers). I think you might want a 4.1 (I thin that is the size), in any case you would want the pulley that is just over 4 inch. 
Drifting
Joined: Jun 2004
Posts: 1,627
Likes: 143
From: Goodyear Az
I have an '02 Z06 with Supermaxx long tubes and the A&A S-Trim kit. The pulley is 4" and it hits 7 psi right at 6400 rpm -- the 4" pulley was the one Andy recommended for a Z06 with a target of 525 rwhp or so with a safe tune, no meth. Just so you know, I also have the V2-SQ and it's VERY quiet... the guys at OC Corvette all said it was the quietest supercharger they've ever heard.
So, a 4" pulley should get you right at 7 psi with your setup.
So, a 4" pulley should get you right at 7 psi with your setup.
Last edited by nuke61; Dec 24, 2006 at 11:58 AM.
Thread Starter
Instructor
Joined: Jul 2004
Posts: 243
Likes: 0
From: Surprise Az
What would be the safe psi for an all stock 2003 z06? 5-8,7-10,etc...... plus if I need the 4" pulley where can it be purchased, thanks
Last edited by 98 corvette; Dec 24, 2006 at 12:16 PM.
Drifting
Joined: Jun 2004
Posts: 1,627
Likes: 143
From: Goodyear Az
The general consensus seems to be something less than 550 rwhp, so that's why I went with the 4" pulley to get about 525 rwhp at 7 psi. As for the pulley, I don't know, since mine came with the A&A kit. I'd suggest calling ECS or A&A, or even Vortech.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
