Upper pulley options?
Thread Starter
Drifting
Joined: Apr 2015
Posts: 1,310
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From: Hager City WI
Upper pulley options?
Hey guys, I currently have the Cordes 2.3 griptek upper pulley. I just saw a FB post from a buddy that mentioned a 2.175 upper pulley from Kong? Has anyone gone smaller than the 2.3 upper pulley with a stock crank pulley? At what point is it too small and starts slipping? Thoughts. Thanks!
Last edited by 1QUICK Z; Dec 31, 2018 at 02:43 PM.
Thread Starter
Drifting
Joined: Apr 2015
Posts: 1,310
Likes: 93
From: Hager City WI
Originally Posted by Greg@KongPerformance
Given the better belt wrap with the LT4, combined with the Griptec coating, we have not had any issues with belt slip on these 2.175 pulleys. 
Last edited by 1QUICK Z; Dec 31, 2018 at 02:47 PM.
Pro
Joined: Oct 2016
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From: Hutto Texas
Thanks Greg. I don't want to press another pulley on my blower since it involves removing the snout. I've heard that the snout needs to be machined down to make the smaller pulley fit? Can you please elaborate. Plus, will I need a different belt? I already have the Gates 080855HD belt. What kind of power difference do you see from the 2.3 to the 2.175 upper pulley?
*Directions for install are on post #11 of this thread, for the CPR 2.17" Pulley:
https://www.corvetteforum.com/forums...-released.html
(There is no mention of machining the snout in the install instructions).
*The belt part number is listed as: belt part number too 25-080855HD (same)
*CPR states later in the thread "boost levels we are seeing the same as an 18% lower so i'm confident it's in the same area blower rpm wise".
Thread Starter
Drifting
Joined: Apr 2015
Posts: 1,310
Likes: 93
From: Hager City WI
Originally Posted by ACS55
Hey John, Hope this helps:
*Directions for install are on post #11 of this thread, for the CPR 2.17" Pulley:
https://www.corvetteforum.com/forums...-released.html
(There is no mention of machining the snout in the install instructions).
*The belt part number is listed as: belt part number too 25-080855HD (same)
*CPR states later in the thread "boost levels we are seeing the same as an 18% lower so i'm confident it's in the same area blower rpm wise".
*Directions for install are on post #11 of this thread, for the CPR 2.17" Pulley:
https://www.corvetteforum.com/forums...-released.html
(There is no mention of machining the snout in the install instructions).
*The belt part number is listed as: belt part number too 25-080855HD (same)
*CPR states later in the thread "boost levels we are seeing the same as an 18% lower so i'm confident it's in the same area blower rpm wise".
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From: Mesa Az
I appreciate the reply, but these install instructions are for the 2.3 upper pulley. Joe Cordes just replied to an email telling me that the snout has to be turned down to get the 2.175 to fit. No idea how much material or how difficult that is to do. He did say that I didn't have to press on another hub since I've already done this.
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Cordes Performance Racing aka "CPR"
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Cordes Performance Racing aka "CPR"
Owner of AZ's premier LSX/LTX motorsports shop
http://cordesperformanceracing.com/
www.facebook.com/cordesperformanceracing.com
joe@cordesperformanceracing.com
480-359-5914
Thread Starter
Drifting
Joined: Apr 2015
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From: Hager City WI
Originally Posted by Joe@CPR
i may have misspoke i guess the smaller 2.175 z-industries can make it to clear. Have not personally tried it though.
Thread Starter
Drifting
Joined: Apr 2015
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From: Hager City WI
Originally Posted by Greg@KongPerformance
The Kong 2.175 does not require machining to clear the snout.
Thread Starter
Drifting
Joined: Apr 2015
Posts: 1,310
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From: Hager City WI
Greg, will I be able to purchase just the pulley since I already have the Cordes hub pressed on my LT4? Your website says that machining isn't necessary if I purchase your pulley and hub but it says that some machining might be necessary if I only purchase the 2.175 pulley? Please advise. Thanks man!
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Yes, all ZPE hubs are the same. Here is the link to purchase the pulley only.No machining is needed. ---> https://kongperform.com/products/2-1...tec-lt4-pulley
Thread Starter
Drifting
Joined: Apr 2015
Posts: 1,310
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From: Hager City WI
Originally Posted by Greg@KongPerformance
Yes, all ZPE hubs are the same. Here is the link to purchase the pulley only.No machining is needed. ---> https://kongperform.com/products/2-1...tec-lt4-pulley
