Home › Forums › Gen III / Gen IV › Gen IV Underdrive Pulley Installation

Viewing 9 reply threads
  • Author
    Posts
    • FastMatt
      Member
      December 1, 2014 at 6:10 pm
      Post count: 56
      #150429

      what did you TQ the bolts to?

    • Shannon Whitehead
      Keymaster
      December 1, 2014 at 7:43 pm
      Post count: 274799
      #150438

      The black anodizing is a nice touch…looks OEM.

    • Shannon Whitehead
      Keymaster
      December 2, 2014 at 5:06 am
      Post count: 274799
      #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
      Member
      December 2, 2014 at 12:54 pm
      Post count: 538
      #150554

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

    • Shannon Whitehead
      Keymaster
      December 2, 2014 at 1:04 pm
      Post count: 274799
      #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
      Member
      December 6, 2014 at 11:16 am
      Post count: 230
      #151568

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

    • Shannon Whitehead
      Keymaster
      December 6, 2014 at 5:45 pm
      Post count: 274799
      #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
      Keymaster
      December 6, 2014 at 6:05 pm
      Post count: 274799
      #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
      Member
      December 6, 2014 at 8:18 pm
      Post count: 230
      #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
      Keymaster
      June 11, 2025 at 2:14 am
      Post count: 274799
      #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
    Posts
Viewing 9 reply threads
  • You must be logged in to reply to this topic.