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Underdrive Pulley?

This is a discussion on Underdrive Pulley? within the External Engine forums, part of the LSx Technical Help Section category; Is this a worthy bolt on? what do you guys think. Anyone notice a difference from just replacing the crank ...

  1. #1
    Member 02bluez28's Avatar
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    Underdrive Pulley?

    Is this a worthy bolt on? what do you guys think.

    Anyone notice a difference from just replacing the crank pulley?

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    Member BURNEM's Avatar
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    there is other things that I would do before pulley. I did it as a final bolt on just to get as much as I could out of the car. Not really impressed on my end.

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    Just me Y2KPewterSS's Avatar
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    It doesn't show much if any peak HP gains, but I have seen gains of 10 HP under the curve. Its a good mod to do when you are doing a cam swap. Lots of better mods out there though.
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    Member 02bluez28's Avatar
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    Quote Originally Posted by Y2KPewterSS View Post
    It doesn't show much if any peak HP gains, but I have seen gains of 10 HP under the curve. Its a good mod to do when you are doing a cam swap. Lots of better mods out there though.
    Well... im lookin for the cheaper stuff right now, im kinda at a loss though. I got my Air lid and K+N, Borlamouth catback, Ported polished TB and coolant bypass, Soon to be headers... what am I missing?

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    What tranny do you have? Headers and suspension mods are next in line for you unless you have an auto tranny, then you want to get a stall.

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    Member 02bluez28's Avatar
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    Quote Originally Posted by Y2KPewterSS View Post
    What tranny do you have? Headers and suspension mods are next in line for you unless you have an auto tranny, then you want to get a stall.
    Yeah im auto. I was looking into a stall, I just dont see how I would pick up any performance beyond first gear...

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    Quote Originally Posted by 02bluez28 View Post
    Yeah im auto. I was looking into a stall, I just dont see how I would pick up any performance beyond first gear...
    Stalls keep you in the power band. Its the best mod there is for LS1/4l60E combos. Most people shave half a second off their ETs with a stall.

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    Member 02bluez28's Avatar
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    Quote Originally Posted by Y2KPewterSS View Post
    Stalls keep you in the power band. Its the best mod there is for LS1/4l60E combos. Most people shave half a second off their ETs with a stall.
    Whats size stall recomended for a DD?

    Thx for the help

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    Senior Member 35thAnniZ28's Avatar
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    Quote Originally Posted by 02bluez28 View Post
    Whats size stall recomended for a DD?

    Thx for the help
    exactly what i would like to know

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    Quote Originally Posted by 02bluez28 View Post
    Whats size stall recomended for a DD?

    Thx for the help
    3500 is a great DD stall. 3200, 3400, 3600 would all be good for DD as well.

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    Yep.. 3600 here... Love it.
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    No Compromise davered00ss's Avatar
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    I gained 14rwhp & 12rwtq with the SLP (March, Powerdyne) underdrive pully. I would say it's a worth wile mod

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    I had a midwest 3400 switched to a yank ss4000 loved the yank. When i went to a 400 trans I also used a yank 4000. Converters are also lighter than stock makeing less rotating mass on the top end. It levels the playing field on a roll with the M6 cars. By staying in power band, with rev extention is also pulls harder and faster through the shifts. My tach doesn't drop below 5500 the whole 1/4 mile.

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    Quote Originally Posted by 02bluez28 View Post
    Well... im lookin for the cheaper stuff right now, im kinda at a loss though. I got my Air lid and K+N, Borlamouth catback, Ported polished TB and coolant bypass, Soon to be headers... what am I missing?
    im kinda in the same boat as you (except i've got a manual tranny). i got a lid, ssra, ported tb, and just bought stainless lt's and a stainless ory. i know for certain that i'll never put a new cam in my car so basically the pulley is all i've got left. the funny thing is that i used to at least wait until one mod was completed before thinking about another. my lt's/ory wont be installed for quite some time and i'm already price shopping for ud pulleys lol.

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    Member Ripper415's Avatar
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    Quote Originally Posted by davered00ss View Post
    I gained 14rwhp & 12rwtq with the SLP (March, Powerdyne) underdrive pully. I would say it's a worth wile mod
    that doesnt seem right. the absolute most i've ever heard of was like 10 rwhp for a pulley. most people say around 8.

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    Member danziger's Avatar
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    I've had my ASP crank pulley on since 2001 and think it's a worthwhile mod. I didn't dyno it separately, but the engine seemed to rev a little quicker after the install. The size/weight difference between stock/ASP pulleys was insane!

  17. #17
    No Compromise davered00ss's Avatar
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    Quote Originally Posted by Ripper415 View Post
    that doesnt seem right. the absolute most i've ever heard of was like 10 rwhp for a pulley. most people say around 8.
    It was done on my car after the cam install, so gains might be higher due to that. But still 8-10rwhp is a worthwhile mod.

  18. #18
    Member va2001ss's Avatar
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    I did dyno after the SLP pulley install but I also added a Katech TB. Combined the two mods gave me 12 RWHP and 14 RWTQ.

  19. #19
    No Compromise davered00ss's Avatar
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    I gained nothing from the TSP Ported TB.

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