badasschevy625

does anyone know a good underive pulley system that doesnt mess with anything i have heard some dont let your battery charge and some make it run to hot let me know which ones the best thanks?

BiGGinZ

This is what I have. Just read the little bit of info it gives.
http://www.jegs.com/cgi-bin/ncommerc...16&prmenbr=361

Mtrhds94Z

LT1's won't run hotter due to water pump not belt driven..
Battery voltage suffers tho, yes.. I don't find it a real prob with mine, I pop it into neutral if sitting long at lights etc..

MarkyMark

I'm a strong believer in the ASP replacement underdrive pulley. I have the alternator underdrive one also, but voltage gets kinda low....so I would just get the crank one only and not the alternator one if you are worried about low voltage and charging.

jeremyferguson

Was there any noticeable difference installing it? I know the question has been asked a million times, I'm just wondering if YOU thought it was worth it. I'm just wanting to get the last couple bolt-ons done before I go internal

BiGGinZ

For the price to me it is worth it. Couldn't tell much of a gain but I could feel the throttle response got better. Here is a dyno that someone did
http://ws6.com/mod-2.htm

A 5 torque peak and 5 hp and 5tq ave. gain under the curve is enough for me to dish out $100 for it. It will not hurt your performance it could only help.

trans9_5am

I also feel the ASP has a nice underdrive pulley/damper. That would be the way to go if i were you.

Brandon

ishz28

I just took mine off after five years and didn't really notice anything other than the battery stays at 13 Volts now.

WS Sick

I had a belt sqeal every time the car shifted under WOT I changed the belt and everything and it never went away I even replaced the tensioner !!!

I added the ASP 34 % underdrive pulley and it gave a little power but it did away with the belt squeal !!! (figure that one out). My charging is effected a little but it still hardly ever goes below the 13 on the gauge, the largest noticeable difference is that when everythings going and youhave your headlights on when at a stop they dim slightly.

trans9_5am

If everyone is so worried about charging, get an overdrive pulley for the alt. Then both your goals are fulfilled. Its as simple as that.

Brandon

orbitalshock2k

UDPs are good stuff, I had one on my old car. Go 4 it

SS MPSTR

I have a March UD crank pulley for sale if anyone is interested.

aaron_depue

I want to but an UDP set up to. I am also curious. I had my mine set on a March power and amp pulley set up. It has both pulleys. Has anybody heard the pros and cons of this set up? Goes for about 115$ and you shouldnt have tho worry about the volts dropping low because, an alt. pulley is included. Feedback would be greatly appreciated