I just recently came across a 7-SYi supercharger for my LS2 and i need some help on it. #1. the unit came with a 8-rib 3.125 on it. and i want to change it to a 6-rib but dont know size to use. im using my stock balancer.so which one to go with? these are the one's the sheet show that are good 3.40, 3.60, 3.80 or 4.00?
That kind of defeats the purpose of the YSi. Kind of like getting a $3000 hooker for a hand job
Very true. But he doesnt even suggest he has anything other than a stock motor. He wants to use a stock balancer.
So it points to me, he's trying to fit this unit to a stock engine. Which in that case....I'd think a 6 rib would be fine.
I fitted my YSi to a stock 346 when I first started, the 6 rib worked just fine
Although admittedly.....it only stayed that way for about 3-4 weeks lol.
If you are going to invest in pulleys anyway, why not stick with the 8-rib and change the stock balancer? You're going to have to do it sooner or later anyway.
Jim
__________________ Don't bring a knife to a gunfight.
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the only thing i chainged was the cam and the lifters(LS7's) 60lb injectors. later i will change it to a 8-Rib since i have sum of the pullys already. this is my first time going with any set up like this. so try'n to get all the info i need. what kinda boost i can get out of it?
Or seeing as you have a 6 rib balancer...and an 8 rib blower....
just put a 6 rib belt on it. Costs nothing.
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2000 A4 WS6 Trans Am 396ci - D1-SC - Stalled Auto - 3966lb - 808.65 RWHP 729.95 RWTQ - 9.98 at 130 MPH SOLD 11/09 2001 A4 Trans Am H/C - Stalled Auto - 3650lb - 442 RWHP 403 RWTQ - 11.6 @ 117 MPH (hitting the limiter) SOLD 1998 A4 Trans Am Very mild H/C - Stalled Auto - 3550lb - 396 RWHP 390 RWTQ - 12.0 @ 113 MPH SOLD
7-SYi supercharger help!!!!! 
