Floridaboy1605

iTrader: (4)

Hey has anyone ran a 28tooth SUPERCHARGER pulley on the rev-up with out changing the JACKSHAFT COG pulley.... Im asking because today when i was installing mine i ran into the cog tensioner pulley hitting the jackshaft cog pulley we worked it out to where its about 1000th of and inch away but the belt is a little loose... so im wondering how loose is to loose???, and away other advice on what to do THANKS alot!!

JET MECH

iTrader: (2)

are you running it over or under the cog idler pulley?

Floridaboy1605

iTrader: (4)

Right now the belt is under the cog idler

JET MECH

iTrader: (2)

you might have to run it over. i know vortech advises not to do this but i have over a 1000 miles on my setup running it this way and i have not had a problem. i am running a 28 s/c cog, 32 g/s cog. look under my thread "Si trim" vortech post #60 at the two last pic's. you will see what i am talking about. i am running the 560 cog belt this way. you may ahve to run the 600 cog belt this way.

JET MECH

iTrader: (2)

with the 28 s/c cog and 34 g/s cog that supercharger is going to be turing some serious rpm! just be careful. what kind of boost are you making at 6600 rpm and at 7000 RPM BTW?

Floridaboy1605

iTrader: (4)

i dont know what boost i am running yet prob like 15 16 pounds.... so my redline is going to be around 6700 hahaha but yeah i tried putting the pulley above the belt and there is no way that is going to happen!!!!! i need a bigger belt or something for that!!! as of right now the belt is under the pulley and the tension is pretty tight i cent even bend the belt 90 degrees so i think that is tight enough!!!

Floridaboy1605

iTrader: (4)

yeah i mean once it gets tuned then its only going to be a weekend toy so its not going to see those rpms except maybe like once or twice a month so i think ill be fine with that power!!

Floridaboy1605

iTrader: (4)

Got a quick question for anyone??? my cog idler pulley does not fit so i am wondering can i just mill the edges of it down a little bit for it to fit??

Floridaboy1605

iTrader: (4)

TTT for some help

eez

iTrader: (1)

i got a 536mm belt from applied.com. It's a pretty tight fit though. My SC did fail shortly after I did the 28T and 536mm belt. My SC was purchased in August, so its one of the ones with defective bearings. Another note is that I had it tuned right after the pulley/belt install so that was probably the most it has ever been pushed, although it never was revved over 6k, since I did not have enough IDC with 440cc's

https://my350z.com/forum/forced-induction/319940-yet-another-vortech-failure.html for reference

philthethrill

bringing this back, i tried to run a 34 28 and belt was to big. i want to do the 32 28 on my rev up. what belt do i need .link?

philthethrill

or id reallt like to do a 34 28 with my 3.12 serp and a 6.12 crank so i would have almost zero belt slip

350z006

iTrader: (79)

For the Revup Vortech kit I use 8MGT-544-21 for 28/34; not sure what you would need for non-revup kit...

dvz

I'm also about to order this belt (Gates 8MGT-544-21 belt) for the same setup: Vortech V-3 SCi revup with 28 teeth supercharger pulley (instead of 32 teeth) without changing jackshaft pulley (34 teeth).
However, it looks like this belt has slightly different teeth profile, with ~5% higher teeth:
http://www.biedlers-belts.com/synchronous-belts.html
What do you think, how reliable is this belt for 34/28 setup?