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Underdrive pulley worth it?

This is a discussion on Underdrive pulley worth it? within the External Engine forums, part of the LSx Technical Help Section category; I've heard that install on these cars is really difficult and not worth the gains you might get. Is this ...

  1. #1
    Rice Hungry GottaHaveLS1's Avatar
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    Underdrive pulley worth it?

    I've heard that install on these cars is really difficult and not worth the gains you might get. Is this a hard install on the ls1 cars? Has anyone seen dyno proven gains. I'm curious about them because I have almost every bolt on and for $200, I wouldn't mind an extra 10 hp. what do you guys think?
    1999 Trans Am M6
    SLP Short Throw, Lid and CAI, BMR STB and SFC, UMI PHB, Pacesetter LT's and ORY, Magnaflow Catback, DMH 3" E-Cutout, LS7 Clutch, Motive 4.10, 160 T-Stat, MSD, !AIR, !EGR, 17x9.5 Chrome C6's wrapped in Hankook 275/40/17

    Tuned at Mongillo Motors in New Haven, CT

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    JUISSED Midnight02's Avatar
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    Given the fact that the install is a bit challenging, it's worth holding off on the pulley swap if you plan to do a cam swap in the future (do both at the same time). Otherwise, you're looking at around $200 + labor for roughly 5-7 rwhp. If you're ready to take the next step without saving up for cam/heads/etc....in my opinion, it's a worthwhile mod. You might also be able to get similar gains from a ported throttle body with bumpstop mod.....all at roughly half the cost and I can promise you the install is much easier than the pulley!

    Unfortunately, since mine was installed during my cam swap, I can't really speak at to precisely what was gained (or essentially "recovered") by adding the U/D pulley.
    Last edited by Midnight02; 03-05-2008 at 01:15 PM.
    2002 Camaro SS M6, 2.5 PRC 5.3L heads, TFS 228/230 cam, FAST 92, bolt ons + a 10 lb bottle in the back.


    1989 Corvette L98, A4, Full bolt ons, etc.

  3. #3
    member since may 2000 nhraformula's Avatar
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    not worth it to me
    2000 nhra edition formula
    a few bolt ons, 379 rwhp
    11.96 @113.25

  4. #4
    Member Speed Psychosis's Avatar
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    I'd like to see proof of that much of a gain. The most I have ever seen on any car was like 3.

    If you have a M6 get a flywheel, if anything. The pretty much do the same thing, add a little whp (but not at crank) and give better throttle response, yet don't have nearly as many side effects. Only thing is its slightly harder start/launch.

    Personally I would do neither and put that money either toward something bigger in performance or a good radio upgrade.

  5. #5
    Random Pics King FSANE's Avatar
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    The only time its actually worth it, if you're already doing a H/C Swap. Since its already out, might as well install the UDP. Otherwise, save your money, time and energy.

  6. #6
    Nitrous Tuner LS2Tuner's Avatar
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    You can get a gain from them. The only thing I can say is don't buy a cheapy they come apart. I have done them when upgrading the oil pumps before.
    Don't be afraid of the bottle!!! Be afraid of your tune!!!

  7. #7
    Member chieftransam's Avatar
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    I got one while I had my h/c installed. I couldn't tell you what the gains from it were though.

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