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Underdrive Pulleys

This is a discussion on Underdrive Pulleys within the External Engine forums, part of the LSx Technical Help Section category; Are they over rated or are they worth the 200 dollars? Any real gains?...

  1. #1
    Junior Member
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    Red
    2000 WS6

    Underdrive Pulleys

    Are they over rated or are they worth the 200 dollars? Any real gains?

  2. #2
    Member Ripper415's Avatar
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    Pewter
    2002 Camaro SS

    most people say they're only worth it after you've done all the other boltons. should be worth ~8 rwhp. but from what i hear install is a bitch, unless you're doing a cam at the same time.

  3. #3
    Member Transam388's Avatar
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    White
    98 Trans AM

    In the big picture I do think they can give you a little HP and that is meaning like 5 to 7 HP. Now what you also need to be aware of though is that you are also going to slow down your alternator and give your car less charge. Some handle that fine but just make sure to be aware of this especially if you have any aftermarket stereo or electronics.

    Anyway, probably as mentioned before I would say do other bolt ons first and then when you are trying to do everything you can to get more HP then consider an under drive.
    98 T/A: HPE 5.3 Heads, 238/242 113 cam, Kooks 1 7/8 stepped LT headers, Custom Y pipe, Cut out, Borla, NW 90MM TB, FAST 90MM Intake, TB Bypass, Under Drive Power steering and Crank, 150 Dry NOS, Yella Terra rockers, 3400 TC, HPE tuning,

  4. #4
    Member danziger's Avatar
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    Le Mans Blue
    2004 Z16

    Got my ASP pulley in 2000 slightly used with belts for $200 shipped. Install was pretty easy and I've never had a problem with it. I don't have a quantified HP number increase as other mods were done before she went back on the dyno. However, the engine seemed to pick up revs quicker after the pulley install...

  5. #5
    Senior Member JonB's Avatar
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    Black
    2005 GTO

    I personally went with one because it was really the only thing left without craking open the motor. At the time I did't plan on cracking the motor but as we all know plans change. I'd say its worth it I put down some darn good numbers 358hp 369ft lbs for my mods(check my sig)
    05 PBM GTO
    Cold Air Inductions CAI,
    Relocated IAT with omega,
    Slp Predator tune,
    Flowmaster axle back with H pipe,
    Custom tuned TCM.
    BC Racing coil overs


    Sold 01 z28

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