i'm looking to upgrade the cog pulley for my vortech, but i can't make out which size.

on Vortech FAQ thread, it says non-rev go from 32 to 34 to have more boost/power, but what makes sense is when going larger diameter you're actually reducing the rpm, which is less boost/power.

was that a typo?

in any case (going with bigger/smaller pulley), is there a need to change the belt?

what's the risk of over spinning the impeller? e.g. if the blower is 53k max speed, and i upgrade the cog pulley to something that maxes the speed to 56k @ 6.5k rpm?

 

Just think of a 10 speed bike to understand this concept.

 

sorry, i still don't get it..

 

the risk of overspinning in the impeller is that the impeller can break sending metal thru your motor, or a bearing goes crashing the impeller into the volute which sends metal thru your motor.

The bigger the jackshaft cog and the smaller the serpentine pulley, the more boost and the faster the impeller spins.

Still dont understand, google pulley systems..

 

^thanks for explaining that..

what about the availablility of the belts? i still can't find this piece of info.

 

Clarification: The 3.33/3.12/2.87 vortech pulleys drive the cog pulley..They are on the same shaft..The smaller the drive pulley the faster the cog gear pulley rotates.

Also, increasing the cog gear pulley from 32 T to 34 T will also result in higher blower rpm.

The incease in RPM's is exactly the ratio of the diameter of either the drive pulley or cog gear pulley..

I have the 2.87 with the 34 T cog for many miles and no problems...Knock on wood...I also like the acceleration with this combo...

 

^good stuff... did u have to change the belt? where did u order the 34T from? GTM or Vortech?

 

34T FROM Vortech. Also, GTM Pulley mod from GTM came with a new Bando belt...A great belt BTW..

 

guys! need help ASAP...

i placed an order for the 34T cog pulley on superchargersonline (2A032-034).. now i got an email back from them saying i've ordered the wrong pulley, and it should be (4GR032-034) instead.!!

thoughts?

 

My350z Vortech Facts are not always True......

Supercharger Cog Pulleys and Jackshaft Cog Pulleys are no the same.

 

He ordered the wrong width to begin with.

Then obviously you need the jackshaft and not the supercharger pulley, like Oldman said above

 

(removed)

Not obvious to everyone.....

 

i misread what you typed, i thought you were talkin about the jackshaft serp pulley

no need to be a f'n douche about it.

 

I accept you Apology....

 

wassup guys ...

searching the forum actually resulted in ppl getting the 50mm one over the 20mm.

i could really go with 20mm, but i was thinking that the belt wont have enough contact with it, and probably would have to change the other 2 pulleys along with it so the belt line up straight.

 

so that's the one i need to go with? your post isnt clear.

 

Yes......It says 20mm, but it should say is for 20mm belt. This pulley is really just under 29mm's wide. Vortech only uses this one width for kits with jackshafts in the last 15 years, as far as I know.