Pulley size on a KB 2.8 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

KBRacing96 · 08-09-2010, 08:34 PM

How small of a pulley can you run on a KB 2.8 with stock 6 rib setup. I'm currently running a 3.75, but I have a 3.25 I want to try. Do you guys think it will spin it with much belt slip. BTW, this is on a forged LS1. in a 01 GMC truck.

usmcjlp · 08-10-2010, 10:47 AM

You can contact Jeff at total performance engineering. He specializes in LS KB applications.

KBRacing96 · 08-10-2010, 09:25 PM

I've sent him a couple emails and didn't get replies, so i thought I would ask here since this is the most active site I have found for KB blowers.

Anyone pulleying down on 6 rib setups??

usmcjlp · 08-10-2010, 09:42 PM

Try calling, he's always busy. He'll answer the phone if he is in.

SonnyakaPig · 08-11-2010, 12:25 PM

I would call Kenne Bell's technical support. You will probably get an answer pretty fast.

KBRacing96 · 08-11-2010, 03:33 PM

I was kinda looking for real word experience... :o/

Guess I will just have to try it and see.

2010SSRSM6 · 08-12-2010, 11:18 AM

Send Adam@ST a pm if you can't get Jeff@TPE.

KBRacing96 · 08-15-2010, 09:02 PM

Well, I went ahead and tried it and it sort of works, lol. I'm only making about 13-13.5lbs of boost and a bit of belt dusting, so I know its slipping some. Blower just takes too much power for a 6 rib to hold. Stretches the belt enough that the tensioner can't keep the belt tight enough for it not to slip a little. I have everything for the 8 rib setup but the balancer pulley, I just wish they weren't $550... :(

wdo-mkr · 10-25-2010, 09:59 PM

1psi for every 1/8 inch reduction in pulley size is what I believe Mike@kb said once.

PoleCat2SSRS2010 · 10-27-2010, 12:13 AM

Quote:

Originally Posted by KBRacing96

Well, I went ahead and tried it and it sort of works, lol. I'm only making about 13-13.5lbs of boost and a bit of belt dusting, so I know its slipping some. Blower just takes too much power for a 6 rib to hold. Stretches the belt enough that the tensioner can't keep the belt tight enough for it not to slip a little. I have everything for the 8 rib setup but the balancer pulley, I just wish they weren't $550... :(

You're not the first to have this problem with the KB. Although when you read the information at their website it says that you won't need the 8 rib until you are pushing 15 psi and over. The only real problem is that NO ONE here has mentioned any solutions. Total_Perf_Eng has alluded (see the Nikey KB 427 build) that they used a tensioner from a 8.3 Cummins but was not very descriptive of the part number and also mentioned that they have tried working with KB for a solution for a while and got well not very far just not to a real solution.

I don't know how the ford and dodge folks deal with this with KB but please keep us up to date as things develop and good luck.

I also just found this. Seems that to keep the KBs in control they went to great lengths.

http://forums.corvetteforum.com/c5-f...cket-pics.html

Slowhawk · 10-27-2010, 08:09 AM

Making power with a blower and avoiding belt slip is always a problem.Happens with all the blowers. Getting 13lbs out of a blower without slip is good. Being dissapointed that you can't get 16lbs out of a 6 rib is just foolish.

Sounds like you need to make the jump to the 8 rib overdrive pulley. Not a big deal for the power/boost you want to push.

08-09-2010, 08:34 PM	#1
KBRacing96 Drives: 01 GMC 4x4 ecsb "Force Feed" ;~) Join Date: May 2010 Location: Wheatland, WY Posts: 8	Pulley size on a KB 2.8 How small of a pulley can you run on a KB 2.8 with stock 6 rib setup. I'm currently running a 3.75, but I have a 3.25 I want to try. Do you guys think it will spin it with much belt slip. BTW, this is on a forged LS1. in a 01 GMC truck.

08-12-2010, 11:18 AM	#7
2010SSRSM6 Drives: My wife crazy with my C5 usage. Join Date: Apr 2009 Location: DFW Posts: 6,558 View My Garage	Send Adam@ST a pm if you can't get Jeff@TPE. __________________ UNDER CONSTRUCTION......again......

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08-10-2010, 10:47 AM	#2
usmcjlp Drives: 2SS/RS LS3 RJT Join Date: Jun 2009 Location: Northern Virginia Posts: 755	You can contact Jeff at total performance engineering. He specializes in LS KB applications.

08-10-2010, 09:25 PM	#3
KBRacing96 Drives: 01 GMC 4x4 ecsb "Force Feed" ;~) Join Date: May 2010 Location: Wheatland, WY Posts: 8	I've sent him a couple emails and didn't get replies, so i thought I would ask here since this is the most active site I have found for KB blowers. Anyone pulleying down on 6 rib setups??

08-10-2010, 09:42 PM	#4
usmcjlp Drives: 2SS/RS LS3 RJT Join Date: Jun 2009 Location: Northern Virginia Posts: 755	Try calling, he's always busy. He'll answer the phone if he is in.

08-11-2010, 12:25 PM	#5
SonnyakaPig Drives: C63 P31 Join Date: Feb 2010 Location: West Coast Posts: 767	I would call Kenne Bell's technical support. You will probably get an answer pretty fast.

08-11-2010, 03:33 PM	#6
KBRacing96 Drives: 01 GMC 4x4 ecsb "Force Feed" ;~) Join Date: May 2010 Location: Wheatland, WY Posts: 8	I was kinda looking for real word experience... :o/ Guess I will just have to try it and see.

08-15-2010, 09:02 PM	#8
KBRacing96 Drives: 01 GMC 4x4 ecsb "Force Feed" ;~) Join Date: May 2010 Location: Wheatland, WY Posts: 8	Well, I went ahead and tried it and it sort of works, lol. I'm only making about 13-13.5lbs of boost and a bit of belt dusting, so I know its slipping some. Blower just takes too much power for a 6 rib to hold. Stretches the belt enough that the tensioner can't keep the belt tight enough for it not to slip a little. I have everything for the 8 rib setup but the balancer pulley, I just wish they weren't $550... :(

10-25-2010, 09:59 PM	#9
wdo-mkr Drives: 01 vette w/a KB. 91 Zr1 415 stroker Join Date: Oct 2010 Location: Southeastern MN Posts: 1	1psi for every 1/8 inch reduction in pulley size is what I believe Mike@kb said once.

10-27-2010, 08:09 AM	#11
Slowhawk Drives: 1999 Trans Am Join Date: Jul 2009 Location: Bridgewater,Ma Posts: 2,017	Making power with a blower and avoiding belt slip is always a problem.Happens with all the blowers. Getting 13lbs out of a blower without slip is good. Being dissapointed that you can't get 16lbs out of a 6 rib is just foolish. Sounds like you need to make the jump to the 8 rib overdrive pulley. Not a big deal for the power/boost you want to push.