Gen IV Underdrive Pulley Installation

[FastMatt]

#150429

what did you TQ the bolts to?

[Shannon Whitehead]

#150438

The black anodizing is a nice touch…looks OEM.

[Shannon Whitehead]

#150456

FastMatt said:
what did you TQ the bolts to?

17 ft lbs

http://driveviper.com/forums/threads/805-2008-2010-torque-specs?highlight=torque+specs

[John Gayton]

#150554

Can you explain the advantages of going with an underdrive pulley?

[Shannon Whitehead]

#150557

The underdrive pulley is smaller in diameter than the stock pulley therefore it drives the alternator , powersteering, and water pump slower. This in turn gives you less horsepower loss.

Rocket said:
Can you explain the advantages of going with an underdrive pulley?

[Roddy]

#151568

Any dyno proven gains? I would consider this if it is relatively easy to install. Price is right

[Shannon Whitehead]

#151632

I’ve heard from others that have done before and after dyno pulls that is is worth 8-10rwhp. That is just hearsay, I wasn’t there and it wasn’t my car. I’ve been interested in doing this as well for some time. Just haven’t gotten around to it.

[Shannon Whitehead]

#151665

If you have a torque wrench this is an easy install. Can’t speak for the dyno gains but there are a few posts on here that do.

[Roddy]

#151680

SSGNRDZ_28 said:
If you have a torque wrench this is an easy install. Can't speak for the dyno gains but there are a few posts on here that do.

Good to know! I’m going to order one. Is there a prefered brand?

[Shannon Whitehead]

#16206

Nothing revolutionary here, but I finally got around to installing my underdrive pulley. This one was from JonB and I had it black anodized. The hardest part was fitting the torque wrench into the tight space. Drives great, no issues, I have the Mopar ECU. On my scale this saved 0.75 lbs of rotating mass and I’m sure it gains a few HP at the wheels.

[Author]

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