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under drive pully

This is a discussion on under drive pully within the External Engine forums, part of the LSx Technical Help Section category; what would this do?...

  1. #1
    down with the lot lizards blackhawk01's Avatar
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    under drive pully

    what would this do?

  2. #2
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    black
    2001 z28

    it ads a little hp, its the last bolt on you do when all the others are done.

  3. #3
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    Quote Originally Posted by sroach20 View Post
    it ads a little hp, its the last bolt on you do when all the others are done.
    That is, if you don't like to have your music loud.

  4. #4
    WTF?! BAIL!
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    Quote Originally Posted by xinthenight View Post
    That is, if you don't like to have your music loud.
    Eh, the decrease in alternator output really is negligible.

    Unless you have a system; and even then you can just get ASP's overdrive pulley for the alternator......

  5. #5
    Moderator Firebirdjones's Avatar
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    Quote Originally Posted by blackhawk01 View Post
    what would this do?
    He he he,,,,for me it lowered the alternator voltage to the point of dimming the lights at night when idling,,,kind of annoying but more importantly it caused some mild cooling issues for me,,,turning the water pump too slow to cool the motor down when idling around,,,,so it causes the fans to run continuously until the rpms are brought up.

    Did absolutely nothing for ET or MPH at the track,,,if there is a HP increase on the dyno,,,,it's surely not enough to see anything at the track. Been there done that. When mine comes off it will be relegated to door stop duty. Save your money for something more usefull.

  6. #6
    Member jag42420's Avatar
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    It generally drops the alternator 500-900rpm from where it needs to be at idle. It really doesn't affect driving, just idle. They free up about 7HP from dynos I've seen. Some people use underdrive crank pullies and overdrive alt pullies to offset the idle issue. Some have used bigger alternators to offset the idle issues. For me, I kept my pulley stock, and will put that money in for a cam and some real power gains...
    2002 WS6 Trans Am, A4, SLP lid, P&P TB, 3500 stall, 24K GVW tranny cooler, HPTuners, Pacesetter LTs, Bassani dual exhaust with 'x' crossover, coolant bypass, sealed airbox to hood.

    http://www.cardomain.com/id/jag42420

  7. #7
    Member hoss 2000 z-28's Avatar
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    I could not tell a real SOTP improvement but the engine seems to rev a little quicker. Since the crank pulley is smaller the accessories aren't spun as fast so the plus is that they would in theory last longer due to fewer RPM's. The drawback is that at idle, the headlights dim and the voltage gauge sits pretty low.

    Having said that I've never had any issues since the alternator charges right back up once you start moving. Also, I am using the stock Monsoon sound system. If you decide to get a UDP and like your music loud then I'd recommend the alt. pulley to offset the smaller crank pulley.

    All in all it is a pretty safe mod and something to consider if you have done everything you want to do or you cant decide if you want to invest in a N/A setup or go F/I and in the meantime have some $ burning a hole in your pocket.

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