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25% underdrive pulley

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  1. #1
    Junior Member Pro Street's Avatar
    Join Date
    Oct 2006

    2002 Vette

    25% underdrive pulley

    When I did my cam,valve springs and headers I installed a 25% underdrive crank pulley.My car is running about 20° warmer now at highway speed and idle.Are any of you guys seeing the same thing?
    2002 Corvette Coupe A4-315 gear-Vararam B2-160°stat-TSP 224R (224/224/ 581/581 114LSA)-25% underdrive pulley-TSP LT headers no cats-Bassani X pipe-Borla Stingers-BlackMaxx tunnel plate-HPTuners

  2. #2
    Join Date
    Aug 2005
    Sugar Land, Texas

    Supersonic Blue
    2012 Z06

    When the cam was installed was tuning done? Maybe your fan setting needs to be lowered. Your idle and part throttle mixture might be a little lean too with the cam creating more heat. Your water pump should be pumping enough water even with the UD pulley and certainly enough if you have your idle slightly higher with the bigger cam. I don't think it's the pulley.

  3. #3
    Awaiting Activation
    Join Date
    Mar 2006
    LS1 land
    yea its normal with the U/D pulley. It slows down the waterpump so thats why the car is running hotter.

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