Underdrive Alternator Pulley

BilletProShop

BilletProShop

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Spinning your alternator passed the factory limit often leads to failure. Extend your alternator’s life by reducing its maximum RPM while maintaining sufficient charge at idle. Our 15% underdrive alternator pulley will help keep the rpms within a more reasonable range when spinning past the factory limiter. Our pulleys are CNC machined from billet 6061 aluminum and are hard black anodized for a durable finish.

$49.95 free shipping

Click HERE to order

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Sizeth3

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Have there been dynos to see what type of power gains would be expected from this? Idle voltage is still good? Also, is a new belt required?
 
BilletProShop

BilletProShop

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Sizeth3 said:
Have there been dynos to see what type of power gains would be expected from this? Idle voltage is still good? Also, is a new belt required?
Click to expand...

This isn't done for HP gains as there is no significant gain. This is mainly to reduce maximum RPM all while maintaining a sufficient idle voltage. I would have to get back to you if belt change is required.

-Mat
 
Derek@Lethal

Derek@Lethal

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beef97 said:
Is it any lighter than stock?
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I would believe it is considerably lighter being that the factory pulley is made from steel.

Nice part, guys. These are real popular with the GT500 guys as they do exactly as they're supposed to.
 
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beef97

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BilletProShop said:
This isn't done for HP gains as there is no significant gain. This is mainly to reduce maximum RPM all while maintaining a sufficient idle voltage. I would have to get back to you if belt change is required.

-Mat
Click to expand...

Yes please let us know as I am very interested. Has this part been tested on an actual car? I would think y'all would already know if a new belt is needed?
 
Riddick

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Are these cars known for overspinning the alternators even on stock crank pulleys? I have not seen any posts of people having issues with over spinning their alternators. For anyone running a larger crank pulley I can see the benefit...
 
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noldevin

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Riddick said:
Are these cars known for overspinning the alternators even on stock crank pulleys? I have not seen any posts of people having issues with over spinning their alternators. For anyone running a larger crank pulley I can see the benefit...
Click to expand...

Boss manifold/cobra jet cars overspin them revving to 7500+
The Boss uses a different alternator with a slightly underdriven pulley.
 

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