1rawTA

Just like the title says, Let's talk pulleys

Pro's and con's to upper or crank? Which do you like and why?
Some People run both?

E85 is not avail. in NJ. and I would rather not install Meth in the car.
So 93 with TORCO (for race days or runs in mexico) are my only real options

This is my first SC car BTW...

Thank you!

L Duncan

I don't like to overspin this blower to much...I have an 8.75 lower and 2.3 upper(makes about 12lbs of boost. No meth.

1rawTA

I agree with what your saying with overspining it, preferably i would like to do just an upper, I belive alot of the car has to come apart to get the lower pulley off? i don't want to pull the rad and the condesor

Any dyno results and what are your other mods?

Thank you

fasthwks

I run upper pulley, intake, x pipe, tune and Corsa and saw 610rwhp if that helps. I too did not want to go with the labor of the lower at this point. M7 car

upcharger

My understanding is that the lower is easier. Seems I could be wrong. I'm getting lower put on this weekend. 15% by lingenfelter. Already have haltech xpipe and magnaflows. No headers. No meth. E85 not available where I am.

David4359

I ran lower all last summer with AR long tubes off road X pipe afe intake and made 660Whp I'm also a m7. I'm going to horse power addicts in Delaware on Thursday and putting a procharger

upcharger

tell us more plz. What all are you doing and what's it gonna cost?

1rawTA

Prob 10k+

1rawTA

I was looking into the cordes upper pulley, along with headers no cats, intake, ported tb into the stock catback... preliminary plans.. no e85 no meth.. maybe make 620whp on mustang dyno

Those are the preliminary plans.

Seannyc

u ever ran the 1/4 with that setup should be 9'second car

Thomasmoto

Well let's start with it's all pink inside...er oh wait sorry, he said pulley's. Sorry couldn't resist.

Z06NJ

Subscribed

Cordes Performance Racing

our upper makes the same power & tq as an 18% lower, I personally think it's easier to install as you don't have to jack up the car at all, the blower comes off super fast imo, and you only need a press and a puller to remove the oem pulley and press our hub on.

AZGASSER

I am waiting on Joe at CPR to get my headers in and coated and that is what I am doing. I have the Haltech in place with a ported TB already. Hopefully in the next week we should be ready for the install and tune. I will keep you posted.

FF_Z06

My research on the forum shows that the lower pulley is the easier and safer install of the two. The upper needs to be pressed off and requires removal of more components. The lower is just bolt on and is easier to reverse. Probably a few hours labor to do lower at a competent shop. Lower also seems to be safer due to MORE belt wrap (less slippage) than the smaller upper that would have LESS belt wrap and greater chance of belt slip.

http://www.superchevy.com/how-to/eng...-corvette-z06/

After learning this I mostly looked at lower pulleys...

Lower options range from 5-18% overdrive. Redline (ATI) makes a 5% and a 15%. Innovators West (most popular it seems) makes a 9% and 18% overdrive versions. 18% seems to be the largest you can run due to subframe clearance. 9% gives you about +3psi (12.5psi) boost over stock (9.5psi). Each psi gives you ~22-25whp. Some have reported the IATs seem to be significantly higher with the 15% and 18% options and creates too much heat. 15% and 18% DEFINITELY needs tuning (and maybe Meth?) while several forum members actually run the 5% and 9% pulleys without tuning (which is NOT recommended of course). Lower IATs with the 5% and 9% pullies obviously.

Hopefully this helps...

1rawTA

This does help, thank you very much! I do believe the rad and condensor have to be removed for lower pulley though, You have to press the crank pulley off, that doesn't just slip on and off.

1rawTA

Keep me in the loop as far as numbers, Are you going to be running straight 93 with no meth? If so this the exact combo i am planning to go with. I have my eyes on the Cordes upper pulley fyi

FF_Z06

You're right, the crank pulley does need a damper removal tool. From what I have read no rad and compressor removal though. Here is a good tutorial another forum member posted...

https://www.corvetteforum.com/forums...y-removal.html

Cordes Performance Racing

safer imo is not relevant nor is one safer than the other. the lower you have to pull more stuff off, lift the car, or put it on jack stands. mine you can do with the car on the ground so from a safety stand point there is no risk of having a car fall on you.. our pulley has absolutely zero slip logged during 1/2 miles. end of the day it all depends on what the customer wants but if they are paying a shop my pulley comes out cheaper than doing a lower, part is less money, and labor is dang near the same.

AZGASSER

No meth and we only have 91 octane here in AZ. I do run some TORCO to boost the octane for the drag strip and 1/2 mile events.