hnaskoct

iTrader: (31)

im planningm on buying a underdrive pulley and i wanted to know if its worth the money???

Ebbsnflows

iTrader: (15)

It depends. How much are you willing to spend on 6-8 rwhp? If 6-8 rwhp isn't worth $170 to you...then no. It's not worth it.

However 95% of the people on here, think it is.

hnaskoct

iTrader: (31)

then im for it

Grimes

iTrader: (3)

Yes, I thought it was definitely worth it....besides the small hp gain, the engine revved noticeably faster.

HaulinHawk

Ditto!

jeffbab

What's the drawback then, other than the cost? Will this hurt you if you run big subwoofer amps?

01Z28M6

Don't - dead battery and the performance gain is minimal; less than what people want to think.

Do a search on more than just this forum. I did and decided no. I think people believe in it but unless you're into pure track performance, I wouldn't bother. Take your spare tire out, run with a half tank of gas and gain more acceleration than the UD pulleys can provide. Your electrical / cooling system will thank you. Just another opinion though....

418redz28

iTrader: (10)

i have had no problems out of my asp. works great.

Chevy406

iTrader: (12)

Even though my voltage gauge reads 14.1 both with stock and U/D pulley (don't forget about the voltage regulator in the alternator)? At 8 hp for $175 that is $22 per hp. A do-it-yourself cam install costs $750 for 40 hp for $19 per hp. The deciding factor should simply be if you want to spend the money or not.

AaronR

iTrader: (8)

Although I didnt dyno after adding just the pulley I felt absolutley no diference.

Tainted

iTrader: (9)

its worth it, but there are other mods ie headers that you should do before you do this one

Super28Sport

x2 save up and get yourself some pacesetters or somethin

BlackScreaminMachine

iTrader: (17)

Its def worth it, will maike 8-10 hp. No loss of driveability.

I dont run a large stereo system, my bud's 02 z28 charges fine. I would do the pulley when your doing a cam, its a PITA to take out and put on but its free hp and free labor if doing the cam.

I will be getting a SLP UD pulley.

01Z28M6

You are correct as the voltage regulator does factor into it. The down side of that is the alternator is commanded at full load much more now. When a battery is very low, you should put a charger on it rather than allow the alternator do the heavy charging for an extended period. Essentially with an underdrive set up, the regulator is commanding the alternator to work under a heavy load more often. So my decision to fore go the pulley mod had to do with the component life of the charging system as well. I notice how the defense for using the pulley keeps upping the horsepower. On the low estimate is 2-5 horsepower and some experienced counsels see it as the least of the modifications. Still, I bought the pulley set for my LT1 and decided to leave the charging system where it was after reading a hundred posts or more. In the end, what really matters is how it makes you feel. I chose an airfoil for my throttle body instead.

Ebbsnflows

iTrader: (15)

People have to understand....there is a downside to practically every single mod that we do (except maybe a lid).

Modifications are about compromise. The Upside vs. the downside. HP/Perforrmance vs Reliability/driveablity. What's acceptable for Joe-Bob, may NOT be acceptable for Billy-bob.

I have to say though, a pulley is one of the more mild mods performed and is considered to have very little downside. From my personal experience (not what I've "Read" or "heard from my cousin's brother's dad's uncle")...Out of the 3 different Fbodies I've owned, I've ran pullies on all 3, and have never had a charging issue or any negative side effect.

I wouldn't hesitate to recommend a pulley for a 6-8 rwhp increase.

Hilton

iTrader: (36)

I have the 25% underdrive version and an overdrive pulley on my alternator. No problems.

01Z28M6

Three of them - never had any negative side effect - wow. Guess what I "Read" from Billy-bob was wrong, then it really is an U P G R A Y E D D. Not Sure just got his *** a presidential pardon.