DustyJL

Will the stock serpentine belt work on the asp underdrive pulley?? I don't want to switch the pulley until I have the right belt.

bru333

Nope! I had to get a belt 3.5 inches smaller for my underdrive crank pulley. I tried 2 inches shorter at first, but once the belt stretches from use (a few days), it moves the tensioner to the worn out mark. I've got a hypertech pulley, I'm not sure if it's exactly the same size as the asp pulley.

coolrimsatleast

When I installed mine, after getting the belt the paper said to get based on what accesories I had, I found out it wasn't the right belt.

I had to put the stock pulley back on, drive to the parts store, change pulley's in the parking lot, and tried 3 belts until I found the right one and bought it.

drdave88

iTrader: (3)

heres what i did, and what i read to do..... put your UD pulley on, take a piece of rope and route it as you would your belt. once you touch end to end, measure what you have and take out 2-3 inches depending on your tensioner. i cant read the part number from my belt anymore, maybe tomorrow ill measure it for you, but i think its 71.5 inches.

1988CamaroSC

iTrader: (2)

why does everybody say if you run the alternator and crank underdrive pulley your car wont be able to idle with the stock charging system for long? has anybody has this kind of problem, im also told "it wont make a difference until you hit 6,000 rpm, by then, you wont have an engine" hmm....bs?

1988CamaroSC

iTrader: (2)

alright i cant find the right fkin belt for my setup, napa sucks. its a 1988 2.8l v-6 mpfi, its still running the A I R system and i have a a/c delete pulley, i also have the underdrive pulleys from summit racing, alternator and crank pulley, what belt do i need? please HELP

drdave88

iTrader: (3)

since you have an A/C delete pulley i cant tell you how long your belt needs to be. mine is 79 inches, i just pulled it off and got the part number off it. but i dont have the AIR pump or a delete pulley. what i did to measure mine was get a piece of rope, route the same way your belt is, measure it and then take about 2 inches off that to make up for the tension. get a belt about that size and you may have to back and forth to the parts store a couple times or change the pulley there and try a couple different belts, ive heard of that done too. those are about youre only 2 options. good luck bud.

if youre running the alt pulley as well you "MIGHT" be ok as long as you dont have any kind of a system. if you do, your alt wont spin fast enough to power it, and i have heard that even stock you wont have enough power from the alt to charge your battery but i cant confrim or deny that.

Dale

iTrader: (12)

The lengths are posted on aspracing.com

1988CamaroSC

iTrader: (2)

so when i complete this should i throw down a few more bucks for a higher amp alternator? whats the amperage of the stock alt? id rather run it without the delete pulley, but the belt rubs from the tensioner on the top of the waterpump...

drdave88

iTrader: (3)

did your car originally have A/C? if so you need to get an A/C delete pulley. if it didnt, you shouldnt have any problems. a smaller alt pulley should pull the belt farther from the waterpump pulley. i believe our 88's had either an 85 amp or 110 amp alternator. if youre running any kind of a stereo other than stock, upgrade. if not, you may want to get the 110 amp alternator just to be safe.... if thats not stock.

there is a 145 amp which came in some of the IROCs and other v8's. the last alternator i got for my car was the stock NAPA replacement and its been fine for a couple years. ive measured it w/ a volt meter at idle and all that, but i dont have the UD alt. pulley either.

there are so many debates on what is the best setup for which UD pulley setup. i guess its kind of a trial and error thing because no one can decide.

1988CamaroSC

iTrader: (2)

my car had a/c i recently took it out, i guess ill go find a bigger alternator just to be safe, its an aftermarket stereo but its not running amps or subs or whatever, just a deck with 4 speakers...

drdave88

iTrader: (3)

if it had A/C, then you have to have the delete pulley, there was a thread on this a lil while back, there isnt enough clearance between the belt coming off the tensioner and the top of the waterpump pulley, so youll have to use the delete pulley. and if you dont have a system, you should be ok, but w/ the alt pulley, i cant be sure. i have a system, but only the crank pulley. if you havent found the belt sizes yet, try the rope trick, it worked for me, i had to go back to the parts store a second time to get the perfect belt, it was trial and error for me, but i got lucky. i couldnt go off any specs though, since i deleted my smog pump too.

91 camaro racer

iTrader: (2)

it will still work, it might fluctuate a little bit at idle but it will still charge fine.