RonnieLS1

Has anybody ever gone from a 3.8 pulley to a 3.6 pulley on Andies Vortech kit without swapping out for a smaller belt? The belt is a bitch to change on these set-ups.

Thanks

Andy@A&ACorvette

Looka at the sliding idler. If it's tightened less than halfway, you should be able to get by with the same belt.
If it's more than halfway, you'll probably run out of tensioner with the smaller pulley.
The proper belt for the 3.6 is a K060905.
The belt looks a lot harder than it is. My guys change a belt in about a half an hour.

2004SpiralGrey

If you need a 3.6" reichard racing pulley for the vortech I have one. They sell for $160 from them direct.

$100+shipping and its yours

madmatt9471

You should be good on the belt!

Looking at mine as well and if one were to go with a smaller pulley in that demension you should be okay.

Let us know how it goes

Thanks,Matt

MIKE-C5

Im running a 3.61 and A&A bracket with doble idlers and I use K060885

ctvette2003

I swapped mine out last yr with no issues at all.

Airwolf

What is the boost increase with going from a 3.8 to 3.6? Also I would guess a new tune would be required too, right?

Sorry for the hi-jack...

chargedc5

tramminc

TRIZ

Airwolf,
From Vortech website:
"A change in one pulley size will usually effect boost 1-2 PSIG... down in diameter, up in boost and vice versa."
Vortech pulley sizes increment by approximately .1" to .2" in diameter.
Basically, predict or expect about 1 psi per .1" drop in pulley size and 20 hp increase in hp.
For example, when I recently changed from a 3.6 to 3.4" there was a 37 rwhp increase on the dyno and 1.8 psi increase in boost.
On the tune; you can drive it just fine off the boost.
But with more air you need more fuel; don't get in boost without retuning. I mentioned that you can drive off the boost so that you know you can drive it safely to get it to the tuner.

FLATOUT

Just sent you a PM on this pulley.

Andy Wheeler

Airwolf

Thanks Triz!
Great info for a new FI guy, like me!