Supercharger Pulley causing Belt Slippage - TCCoA Forums
 
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post #1 of 11 (permalink) Old 06-02-2012, 07:10 PM Thread Starter
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Supercharger Pulley causing Belt Slippage

I have an Allen Engine Supercharger kit with an Eaton M90S blower and a 2.52" supercharger pulley. I upgraded my tensioner arm pulley to the Thump RRR and changed the Crank Pulley to a 10% Overdrive pulley to try and eliminate the belt slippage. The car was tuned today and the bottom end torque jumped up 50 Ft-Lbs, but the peak Horsepower actually dropped due to the belt slippage, as the boost dropped 1.7 PSI from 3600 to 5500. Please advise if anyone knows if a Carbonite Coating to the Supercharger pulley will decrease belt slippage.

Thanks...

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post #2 of 11 (permalink) Old 06-03-2012, 12:27 PM
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what pulley setup you runnin? 6,8,10 rib? 2.5 is pretty small.

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post #3 of 11 (permalink) Old 06-03-2012, 12:40 PM
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It's prolly not belt slip u are over spinning the m90 and it's not efficient at those level hence why boost drop and the 4.6 can move more air than the blower can put out on the top end

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post #4 of 11 (permalink) Old 06-03-2012, 04:14 PM
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I had to switch from 6-rib to 8-rib when I reduced pulley size to 2.7" on my SVO.

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post #5 of 11 (permalink) Old 06-03-2012, 11:43 PM Thread Starter
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The 2.52 pulley is the 9 PSI pulley that came with the Allen Engine 9 PSI Kit, so it is what they designed the kit to use. I am not over spinning the blower. It is clearly belt slippage due to the fact that the belt does not fully wrap around the pulley in the Allen Design. We saw the belt slipping during the dyno run. Scott Graves designed and built my set up, so I trust that he used the right supercharger pulley, since he was the owner and designer of Allen Engines. As for the belt rib, it is a 6 rib, which is why I have the belt slippage. I have tried to find an 8 Rib pulley but am unable to find one...

AED 9 PSI Supercharger, .30 over Forged Block with Manley H-Beam Rods & Pistons, Innovative West 10% Overdrive Crank Pulley, Thump RRR Tensioner Pulley, Cobra Crankshaft, BPE Racing Stage 2 Ported & Polished Heads, Crower Direct Replacement Cams, 70MM Throttle Body, MAC Cold Air Intake, 80 MM L-MAF, 38Lbs Injectors, JBA Ceramic Coated Headers, Metal Matrix Drive Shaft, Kevlar Clutch & Kolene Reaction Plate Transmission, True 2.5" Dual Magnaflow Exhaust (Cats & Mufflers), Griffin 1 1/4" Radiator, B&M Racing Trans Cooler, Hughes 2750 Stall Torque Converter, 3.73:1 Gears with Traction Lock Differential, Trans-Go Kit, Superchips Custom Tune for Supercharger, 17" SVT Wheels, Kenny Brown Suspension Enhancers & Eibrach Lowering Kit.
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post #6 of 11 (permalink) Old 06-04-2012, 06:28 AM
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Try contacting ASP. They custom-built me a 2.7" diameter 8-rib pulley a couple of years ago, and only charged me $85.

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post #7 of 11 (permalink) Old 06-06-2012, 12:27 AM Thread Starter
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Thanks Mike...Do you have a web address, as I am not familiar with ASP...

I found the pulley that I need, but it is billet aluminum and coated. Carbonite said they could glass bead it to remove the coating and then apply the carbonite coating, but they said it would work best on a steel pulley. Anyone know where to find the steel pulley?

AED 9 PSI Supercharger, .30 over Forged Block with Manley H-Beam Rods & Pistons, Innovative West 10% Overdrive Crank Pulley, Thump RRR Tensioner Pulley, Cobra Crankshaft, BPE Racing Stage 2 Ported & Polished Heads, Crower Direct Replacement Cams, 70MM Throttle Body, MAC Cold Air Intake, 80 MM L-MAF, 38Lbs Injectors, JBA Ceramic Coated Headers, Metal Matrix Drive Shaft, Kevlar Clutch & Kolene Reaction Plate Transmission, True 2.5" Dual Magnaflow Exhaust (Cats & Mufflers), Griffin 1 1/4" Radiator, B&M Racing Trans Cooler, Hughes 2750 Stall Torque Converter, 3.73:1 Gears with Traction Lock Differential, Trans-Go Kit, Superchips Custom Tune for Supercharger, 17" SVT Wheels, Kenny Brown Suspension Enhancers & Eibrach Lowering Kit.
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post #8 of 11 (permalink) Old 06-06-2012, 01:24 AM
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Quote:
Originally Posted by Wolverine27 View Post
Thanks Mike...Do you have a web address, as I am not familiar with ASP...

I found the pulley that I need, but it is billet aluminum and coated. Carbonite said they could glass bead it to remove the coating and then apply the carbonite coating, but they said it would work best on a steel pulley. Anyone know where to find the steel pulley?
Why not knurl the inside of the ridges or perpendicular cut grip slashes in the pulley like some of the aftermarket companies do? Or, maybe add an additional idler or reroute the belt to better wrap the SC pulley?

Just some ideas.

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post #9 of 11 (permalink) Old 06-06-2012, 08:04 AM
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As said before u are over spinning it a 2.52 on a m90 with 10 percent overdrive pulley, I gurantee u if we calculate the rpm it's being over spun, hence why mike had to go 8 rib, I mean heck he was slipping at a 2.7 and u are talking 2.52 which is why u are having issues,

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95 bird corn powered 735rwhp and 580 tq
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10.75 @128.38
95 bird - Vortech t trim
9.98 worlds fastest IRS 4.6 thunderbird
1/8 [email protected]
10.11 @ 139.19 best mph
1.47 best 60ft if I can get a full pass with this 60ftt
All made possible with Braincoating'ôs ported manifolds
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post #10 of 11 (permalink) Old 06-06-2012, 08:57 AM
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Wolverine27,

ASP is Auto Specialties Performance. Their website is autospecialties.com.

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post #11 of 11 (permalink) Old 06-06-2012, 05:03 PM
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10% is not over revving a M90. If its a stock case 10% is max for efficiency if it ported or a 94/95 or a GTP then 15%, you get a MPX then 20%.

Either way though you need a 8-rib belt.

If all else fails get a bigger hammer!

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