Supercharger cog belt being constantly chewed

clkio · 01-25-2015, 07:25 AM

I have a stillen upgraded kit pushing 12.5 psi (cog, impeller). The belt cog is not centered on the idler pulley (pushing more on the pulley towards back of the car not front) and it's eating up cog belts (third belt in 2 weeks). I have it tensioned properly when I install it and as soon as I start the car, the belt shift all the way to the side, and when I drive it, it starts to rub against the side of the pulley and belt goes. Any help guys would be great? such a stupid problem to have especially since the car is running mint beside that. thx you

SouthArk370Z · 01-25-2015, 07:57 AM

Either the pulley needs to be shimmed or the shaft is bent.

ANMVQ · 01-25-2015, 09:27 AM

When mine was eating them its wasn't a bent shaft. But it was over tight, Just remember that after the PM . If its over tightened it can, Bend the shaft tho.

clkio · 01-25-2015, 09:51 AM

I am tightening to the point were I can twist the belt to about 45 degrees with my thumbs, that's how I always done my belts and had no issues. Besides, when I had it less tight, the belt use to slip completely under WOT. I am gone check the shaft and see if I can see any bents. Mike you gave up all together bro? there has to be a solution.

clkio · 01-25-2015, 10:03 AM

Here another pic. You clearly see its rubbing on the right side of the pulley and it's shredding the belt.

Pro4Jackster · 01-25-2015, 10:46 AM

Is it getting most of the damage when you drive the car at WOT to redline? If you drive it for a few days with no hard pulls, does the belt stop shredding?

If so, your bracket may be flexing under WOT, and it causes your pulleys to be out of alignment temporarily. That was one of my problems. JTran made me this support and mine stopped shredding belts.

clkio · 01-25-2015, 11:31 AM

Quote:

Originally Posted by Pro4Jackster

Is it getting most of the damage when you drive the car at WOT to redline? If you drive it for a few days with no hard pulls, does the belt stop shredding?

If so, your bracket may be flexing under WOT, and it causes your pulleys to be out of alignment temporarily. That was one of my problems. JTran made me this support and mine stopped shredding belts.

INTERESTING! normal driving belt is fine, if i am reving her hard or driving her hard then it starts to happen. This could be the problem, I am going to drop the car off to my tuner tomorrow and have him check it out and see if that solves the problem. thx alot man

nomodsjk · 01-25-2015, 01:14 PM

That brace is brilliant!

nomodsjk · 01-25-2015, 01:15 PM

Op how much whp are you making with your set up?

swiss370Z · 01-25-2015, 02:25 PM

Hey Sir

When I look at your pictures to me,
I think that the belt does not fit the pulley.

Or the angle is not right 100%.
Verifiable the time.

Greetings
Ivo

Nut_N_Much · 01-25-2015, 02:35 PM

Yes, you will need to build a adjustable bracing arm. Osiris, Mine and a few others that have done the COG Swap also had to brace the SC. Ours ran from the side of the SC to a plate we bolted to the inner fender.

No need for a huge support like the one shown above. I used the caliper support from a Harley Springer Front End. I'll see if i still have pic's i can post.

Did you notch the block to clear the pulley.

Pro4Jackster · 01-26-2015, 01:14 AM

It looks like he shaved down the lip on the pulley to help it clear the motor. I had to do the same thing. I don't know the clearance differences between the HR and VHR, but I could not cut a notch big enough to clear. So I had to have a custom idler pulley made. It was 2.5" if I remember correctly. JTran did the whole thing, and may still have my entire cog setup. That will give someone a smaller idler to be able to run a 34T/30T cog combo without notching into the motor.

clkio · 01-26-2015, 06:24 AM

Quote:

Originally Posted by Pro4Jackster

It looks like he shaved down the lip on the pulley to help it clear the motor. I had to do the same thing. I don't know the clearance differences between the HR and VHR, but I could not cut a notch big enough to clear. So I had to have a custom idler pulley made. It was 2.5" if I remember correctly. JTran did the whole thing, and may still have my entire cog setup. That will give someone a smaller idler to be able to run a 34T/30T cog combo without notching into the motor.

I am looking at the picture you sent me and my supercharger cog pully is much narrower than the one in your picture, I went and measured it and it was 35mm in width (not 50mm) and I doubt that the shop that did the install shaved anything of the engine to get it all to line up. I think I will have to go with the 50mm wider supercharger pulley (2A032-030) and build the brace to help with the flexing and hopefully that does it.

ANMVQ · 01-26-2015, 07:30 AM

These are the parts I ran are these the same as the ones you have ?

Vortech 4GR116-300 IDLER ASSY 20MM GILMER Chevrolet Corvette

Vortech 2A042-070 COG BELT GATES 20MM 70 TOOTH Infiniti G35

Vortech 4GR032-034 Cog Style Jackshaft Pulley (34 Tooth Count) 1997-2004 Chevrolet Corvette

Vortech 2A033-030 30 Tooth 35mm Supercharger Drive Cog Pulley

Pro4Jackster · 01-26-2015, 09:42 AM

Quote:

Originally Posted by clkio

I am looking at the picture you sent me and my supercharger cog pully is much narrower than the one in your picture, I went and measured it and it was 35mm in width (not 50mm) and I doubt that the shop that did the install shaved anything of the engine to get it all to line up. I think I will have to go with the 50mm wider supercharger pulley (2A032-030) and build the brace to help with the flexing and hopefully that does it.

Also, look how shiny the lip on your idler pulley is on post #1. I can't tell if it has been shaved down, or if it's making contact somewhere. But, keep a close eye right there, the cog belt can try to walk over it under load. A fix would be a smaller pulley with the lip left intact.

01-25-2015, 07:25 AM	#1 (permalink)
clkio Enthusiast Member Join Date: May 2014 Location: Cambridge ON Posts: 265 Drives: 09 370z M6 Rep Power: 12	Supercharger cog belt being constantly chewed I have a stillen upgraded kit pushing 12.5 psi (cog, impeller). The belt cog is not centered on the idler pulley (pushing more on the pulley towards back of the car not front) and it's eating up cog belts (third belt in 2 weeks). I have it tensioned properly when I install it and as soon as I start the car, the belt shift all the way to the side, and when I drive it, it starts to rub against the side of the pulley and belt goes. Any help guys would be great? such a stupid problem to have especially since the car is running mint beside that. thx you

01-25-2015, 07:57 AM	#2 (permalink)
SouthArk370Z Premium Member Join Date: Nov 2010 Location: South Arkansas Posts: 8,435 Drives: 2014 Challenger Rep Power: 324198	Either the pulley needs to be shimmed or the shaft is bent. Jordo! likes this. __________________ Steering Lock Links - Search The370Z Bookmarklet - FSM @ NICOclub Mankind has progressed past the need for war but we haven't evolved that far. - NachoMahma

01-25-2015, 09:27 AM	#3 (permalink)
ANMVQ A True Z Fanatic Join Date: Mar 2011 Location: Framingham MA Posts: 2,732 Drives: 2014 Q50 AWD Rep Power: 20	When mine was eating them its wasn't a bent shaft. But it was over tight, Just remember that after the PM . If its over tightened it can, Bend the shaft tho. __________________ 14 Q50 AWD, ARK, ECUTEK (SEB), Takda,

01-25-2015, 10:46 AM	#6 (permalink)
Pro4Jackster Base Member Join Date: Oct 2011 Location: NW Houston Posts: 130 Drives: '08 350Z Rep Power: 14	Is it getting most of the damage when you drive the car at WOT to redline? If you drive it for a few days with no hard pulls, does the belt stop shredding? If so, your bracket may be flexing under WOT, and it causes your pulleys to be out of alignment temporarily. That was one of my problems. JTran made me this support and mine stopped shredding belts. JARblue, DEpointfive0, Leroydsouza and 2 others like this. __________________ Jtranbuilt '08 Z [Jtran PT7075 Single - Fujitsubo - Transgo - Wilwood - TE37SL - BC Racing]

01-25-2015, 01:14 PM	#8 (permalink)
nomodsjk Premium Member Join Date: Apr 2014 Location: martinsburg wv Posts: 2,073 Drives: 2011 370z MB/7at Rep Power: 19963	That brace is brilliant! swiss370Z and elperuano like this.

01-25-2015, 09:51 AM	#4 (permalink)
clkio Enthusiast Member Join Date: May 2014 Location: Cambridge ON Posts: 265 Drives: 09 370z M6 Rep Power: 12	I am tightening to the point were I can twist the belt to about 45 degrees with my thumbs, that's how I always done my belts and had no issues. Besides, when I had it less tight, the belt use to slip completely under WOT. I am gone check the shaft and see if I can see any bents. Mike you gave up all together bro? there has to be a solution.

01-25-2015, 10:03 AM	#5 (permalink)
clkio Enthusiast Member Join Date: May 2014 Location: Cambridge ON Posts: 265 Drives: 09 370z M6 Rep Power: 12	Here another pic. You clearly see its rubbing on the right side of the pulley and it's shredding the belt.

01-25-2015, 01:15 PM	#9 (permalink)
nomodsjk Premium Member Join Date: Apr 2014 Location: martinsburg wv Posts: 2,073 Drives: 2011 370z MB/7at Rep Power: 19963	Op how much whp are you making with your set up?

01-25-2015, 02:25 PM	#10 (permalink)
swiss370Z Track Member Join Date: Jun 2011 Location: In the Mountains Posts: 649 Drives: VW UP! 1.0 Ltr Rep Power: 16	Hey Sir When I look at your pictures to me, I think that the belt does not fit the pulley. Or the angle is not right 100%. Verifiable the time. Greetings Ivo __________________ /// ONE LAST RIDE /// R.I.P. FAIRLADY Z ///

01-25-2015, 02:35 PM	#11 (permalink)
Nut_N_Much A True Z Fanatic Join Date: Dec 2011 Location: Pensacola Florida Posts: 1,696 Drives: Awesome Car Rep Power: 27	Yes, you will need to build a adjustable bracing arm. Osiris, Mine and a few others that have done the COG Swap also had to brace the SC. Ours ran from the side of the SC to a plate we bolted to the inner fender. No need for a huge support like the one shown above. I used the caliper support from a Harley Springer Front End. I'll see if i still have pic's i can post. Did you notch the block to clear the pulley. Jordo! likes this. __________________ Did new cool science stuff to the car !!! http://www.the370z.com/mazoc/99606-z...y-14-17-a.html http://www.the370z.com/diy-section-d...-w-videos.html

01-26-2015, 01:14 AM	#12 (permalink)
Pro4Jackster Base Member Join Date: Oct 2011 Location: NW Houston Posts: 130 Drives: '08 350Z Rep Power: 14	It looks like he shaved down the lip on the pulley to help it clear the motor. I had to do the same thing. I don't know the clearance differences between the HR and VHR, but I could not cut a notch big enough to clear. So I had to have a custom idler pulley made. It was 2.5" if I remember correctly. JTran did the whole thing, and may still have my entire cog setup. That will give someone a smaller idler to be able to run a 34T/30T cog combo without notching into the motor. clkio likes this. __________________ Jtranbuilt '08 Z [Jtran PT7075 Single - Fujitsubo - Transgo - Wilwood - TE37SL - BC Racing]

01-26-2015, 07:30 AM	#14 (permalink)
ANMVQ A True Z Fanatic Join Date: Mar 2011 Location: Framingham MA Posts: 2,732 Drives: 2014 Q50 AWD Rep Power: 20	These are the parts I ran are these the same as the ones you have ? Vortech 4GR116-300 IDLER ASSY 20MM GILMER Chevrolet Corvette Vortech 2A042-070 COG BELT GATES 20MM 70 TOOTH Infiniti G35 Vortech 4GR032-034 Cog Style Jackshaft Pulley (34 Tooth Count) 1997-2004 Chevrolet Corvette Vortech 2A033-030 30 Tooth 35mm Supercharger Drive Cog Pulley __________________ 14 Q50 AWD, ARK, ECUTEK (SEB), Takda,

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