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Thread: Underdrive Pulley??

  1. #1
    Join Date
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    Underdrive Pulley??

    is it worth it? what gains are there and what losses are there??

    R.I.P Blue '02
    '08 - 5.3
    Vette Servo, Flowmaster 40

  2. #2
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    Some people say there's a noticeable gain and there may be. Then again, some say the same about efans and all I noticed was better idle AC.

  3. #3
    Join Date
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    Plainfield, IL
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    I'll let you know by friday.... ordered one last week, should be here monday or tuesday.


    Gains should be in range of 5-10hp max. Slightly better gas mileage/acceleration.


    Cons--lower A/c temps at idle. Slightly lower alternator output at idle, slowing turning water pump, etc
    blown transmissions are about as useful as 97% of the guys on this forum

  4. #4
    Join Date
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    get it bro,less drag on engine.quicker rpms.

  5. #5
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    cant hurt... i guess
    01 Silverado

  6. #6
    broke1 Guest
    Anyone know what the charging differences would be?Mine has a pretty large stereo....

  7. #7
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    Quote Originally Posted by broke1 View Post
    Anyone know what the charging differences would be?Mine has a pretty large stereo....
    good question. my headlights dim enough as it is with two 10s and a 1000w amp and i dont feel like buyin a new alternator

    R.I.P Blue '02
    '08 - 5.3
    Vette Servo, Flowmaster 40

  8. #8
    Join Date
    May 2009
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    I plan on doing a b4/ after with it. The way alternators work, there should be almost no difference. The alternator would just 'work' harder at idle to keep same voltage. It's not a permanent magnet device, so it should balance itself out...by theory atleast.
    blown transmissions are about as useful as 97% of the guys on this forum

  9. #9
    Join Date
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    newburgh, NY
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    Quote Originally Posted by jetersaurous View Post
    good question. my headlights dim enough as it is with two 10s and a 1000w amp and i dont feel like buyin a new alternator
    The trick flow pulley comes with a overdrive alternator pulley to help charging.
    Step 1. crus at it.
    Step 2. get a hammer.
    Step 3. torch it.

  10. #10
    i have the ASP pulleys, I have the volt drop at idle. I have a 06 so efans. the engine seems to spin faster i did not really notice a power difference since i added 10.4 wires, headers, catback at the same time along with a tune. over all there was a huge difference but cant say one or the other did it

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