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underdrive pulley. wat to expect?

This is a discussion on underdrive pulley. wat to expect? within the General Help forums, part of the LSx Technical Help Section category; I'm thinking about getting an underdrive pulley for my car to get a couple hp out of it. I've gotten ...

  1. #1
    Member slpdablueZ28's Avatar
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    underdrive pulley. wat to expect?

    I'm thinking about getting an underdrive pulley for my car to get a couple hp out of it. I've gotten a little used to it. I've been wondering wat kinda power gains should I expect with my current tune. And would it mess with my tune or am I fine just throwing the bugger on there? Finally I'm wondering which one I should get? I've been looking at either the slp one for like 180 for a harmonic balancer+pulley. Or an asp "racing" set which has crank and alternator pulleys for 220. Which is better? Which would gain me more? And does tune snafu?
    2002 z28-slp cai, slp loudmouth, slp tuned headers, slp 85 mm MAF, slp high flow cats, 3" y-pipe and collectors
    331.6 rwhp/356.9 rwtq

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    Member lsgunner28's Avatar
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    is your car a daily driver?

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    Member slpdablueZ28's Avatar
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    Yes. But I never really use ac. Heat in the winter. And don't really listen to radio that much

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    Life in the Fast lane sunsetorangess's Avatar
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    You wont need a re-tune. More of a headache in my opinion. You wont pick up any Hp that you will feel.
    If its a DD i wouldnt mess with the Alt pulley although its your call, also ensure you pick up a new Balancer bolt if you decide to swap it.
    J
    2001 SS, Its not the car its the Driver that matters....

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    Junior Member corvet786c's Avatar
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    you would gain anywhere from 3-5 hp depending on other mods.

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    Member slpdablueZ28's Avatar
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    Only 3-5? Their site claims 13 rwhp on stock set up? Is it worth getting the pulley or just forget about it?

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    Life in the Fast lane sunsetorangess's Avatar
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    Quote Originally Posted by slpdablueZ28 View Post
    Only 3-5? Their site claims 13 rwhp on stock set up? Is it worth getting the pulley or just forget about it?
    Forget about it, spend the money elsewhere.
    J

  8. #8
    Member slpdablueZ28's Avatar
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    well guess i just saved myself some money

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    I herd a .10 at the drag strip.

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    Member kiddynamite's Avatar
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    13 rwhp? now thats some false advertising!

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    NY Representative basballny2's Avatar
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    it doesnt "add" any horsepower it just "frees up" more horsepower.....

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    Member slpdablueZ28's Avatar
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    So its not worth the hp it "frees" up? Wat would be wrong with messing with the alt pulley on a dd?

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    NY Representative basballny2's Avatar
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    Quote Originally Posted by slpdablueZ28 View Post
    So its not worth the hp it "frees" up? Wat would be wrong with messing with the alt pulley on a dd?
    depends on what your doing with the car, in your case your car is a dd and you want to leave it streetable and not affect gas mileage by adding things such as a cam but still want to add a few hp here and there then IMO its worth it.

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    Member slpdablueZ28's Avatar
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    Well I'm going to do a cam... eventually. Right now I was thinking about doing a 9" with 3.73's and a stall. Maybe something around 3000. I get 10 mpgs as it is anyway. Sould the pulley be kinda worth it in the long run for future upgrade + mpgs?

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    Member TA98's Avatar
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    What is done to your car thats only letting you get 10 mpgs?!?!

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    Car Nut ICRAZY6's Avatar
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    I was looking to get the most out of my stock block so I purchased one on the cheap. It was used got it for $115 shipped. SLP unit, netted about 7hp on the dyno. Only thing I didn't like was since it is smaller than stock it spins the power stearing slower and stearing is slightly sluggish, other than that it's fine.

    I'll be selling mine once I go to a larger cube motor.

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    ʢ ൧ ൨ ൩ ൪ ൫ ൬ ൭ ൮Ր Ց Ւ Փ Smittro's Avatar
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    Quote Originally Posted by T/A98 View Post
    What is done to your car thats only letting you get 10 mpgs?!?!
    +1 ???
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    Moderator Firebirdjones's Avatar
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    I had one on mine for a while. It didn't do squat for ET or MPH on my car.

    What it did do, is cause the voltage to drop while idling around, especially at night with lights, heater, etc... running. I could live with that...

    What I couldn't live with is how I noticed the car running warmer when idling around as well. To the point where the fans would continuously run at idle, especially with the A/C on. It was just turning the water pump too slow. As soon as I gave the car some gas and held rpms at around 1500,,,the temps would drop like a rock and the fans would kick off. I run a 170 stat with the fans set to shut off at 185,,,and it wouldn't even cool it that far when idling
    That was a problem while just living in Ohio where summer temps hit the 90's. I knew moving to AZ would be even worse, so the pulley came off.

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    ʢ ൧ ൨ ൩ ൪ ൫ ൬ ൭ ൮Ր Ց Ւ Փ Smittro's Avatar
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    Quote Originally Posted by Firebirdjones View Post
    I had one on mine for a while. It didn't do squat for ET or MPH on my car.

    What it did do, is cause the voltage to drop while idling around, especially at night with lights, heater, etc... running. I could live with that...

    What I couldn't live with is how I noticed the car running warmer when idling around as well. To the point where the fans would continuously run at idle, especially with the A/C on. It was just turning the water pump too slow. As soon as I gave the car some gas and held rpms at around 1500,,,the temps would drop like a rock and the fans would kick off. I run a 170 stat with the fans set to shut off at 185,,,and it wouldn't even cool it that far when idling
    That was a problem while just living in Ohio where summer temps hit the 90's. I knew moving to AZ would be even worse, so the pulley came off.
    Hey budda me thinks da fan is supposed to run with the A/C on bud..

  20. #20
    Moderator Firebirdjones's Avatar
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    Quote Originally Posted by Smittro View Post
    Hey budda me thinks da fan is supposed to run with the A/C on bud..
    Ya, it ran continuously without the A/C though. And temps got worse with the A/C on. (as long as the car was idling)

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