underdrive pulley. wat to expect?

[slpdablueZ28]

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?

[lsgunner28]

is your car a daily driver?

[slpdablueZ28]

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

[sunsetorangess]

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

[corvet786c]

you would gain anywhere from 3-5 hp depending on other mods.

[slpdablueZ28]

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

[sunsetorangess]

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

[slpdablueZ28]

well guess i just saved myself some money

[garygnu65]

I herd a .10 at the drag strip.

[kiddynamite]

13 rwhp? now thats some false advertising!

[basballny2]

it doesnt "add" any horsepower it just "frees up" more horsepower.....

[slpdablueZ28]

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

[basballny2]

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.

[slpdablueZ28]

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?

[TA98]

What is done to your car thats only letting you get 10 mpgs?!?!

[ICRAZY6]

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.

[Smittro]

What is done to your car thats only letting you get 10 mpgs?!?!

+1 ???

[Firebirdjones]

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.

[Smittro]

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..

[Firebirdjones]

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)