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Old 10-01-2012, 08:10 PM   #1
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Belt length for UD pulley?

Does anyone know the belt length needed when running the 4" underdrive pulley?

Thanks in advance...
1999 Carrera 4 Aero kit 4" UD Pulley
My Corvette doesn't leak oil... it sweats horsepower.
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Old 10-02-2012, 02:44 AM   #2
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This info may help with selecting a shorter belt:

Hello Johnny.

If you can be sure (confirm with a Porsche dealer if you'd like) that your Boxster uses the same belt as my 2007 Cayman S then yes, the Gates K060820 should work fine.

If you'd like to play it safe, take you OEM belt in to your local auto-parts store that sells Gates and tell him you need a similar belt but about 30mm to 38mm shorter. My stock 2007 Cayman S belt measures 2113mm, Gates part #K060832.

Gates offers the same belt design in neighboring lengths of 2098, 2082, 2071 and 2058 mm. The 2082 mm (31mm shorter than stock) seems to be the best length based on the calculation of the under-drive pulley circumference. For future reference this Gates belt is #K060820.

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Old 10-02-2012, 03:18 AM   #3
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this might help...

HELPFUL HINT: What size serpentine belt to run when using an under drive pulley? - GSR Autosport Community
"Speed has never killed anyone, suddenly becoming stationary... that's what gets you."
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