blackZ28LS1

iTrader: (2)

Just curious is the underdrive pulley worth purchasing or not?
Thanks

Kingc8r

iTrader: (21)

It helps, don't expect a huge SOTP difference

blackZ28LS1

iTrader: (2)

thanks for the help

2000Hawk

iTrader: (5)

What are you asking, if it will help power wise? You will gain a bit of power off it, but nothing thats going to make the car perform any different.
-Joel

ODAWG

the underdrive pully is one those mods you will not see any big gains on the dyno but you will see a gain at the track especially with an aftermarket cam.

chieftransam

I got one and it was a PITA to get off and put back on...other than that it's a gain of just a few hp.

98camaroLS1M6

iTrader: (35)

.10 at the track, anywhere from 3-12rwhp is what I have seen on the dyno.

wht01ws6ta

iTrader: (45)

Yeah, the main thing is you have to make sure you have a good way to put if back on though since the crank bolt will not be long enough to pull the aftermarket pulley back on. You want a 16mm 2.0 pitch threaded rod to make yourself a tool or buy a tool from someone else. I just used the threaded rod and some nuts and washers. Here is the link to some info on this: https://ls1tech.com/forums/showthrea...55#post5797655

BlackScreaminMachine

iTrader: (17)

I have one and love it, the high wall helps keeps the belts on better. UD pulley is def a gain, much better then the LT1 cars. No charging issues, there is a SFI # on it, i forget the exact #.

The pulley is only a PITA if the person doesnt have the proper puller. We didnt need any boiling water or a oven to get it on. A lil oil and the proper tool w/ socket and it was fine.

jetlag

iTrader: (32)

6rwhp, 10trq

LS1ne

iTrader: (6)

hey look at it this way, every bit counts. i have one on mine PITA to get the old one off. but you will free up some hp and mpg.

GG01SS

iTrader: (1)

I had a buddy with a lift, impact, took 10 minutes. Make sure you use new bolt when installing new pulley. It is worth it, if you are looking for full bolt-ons. Before my stock clutch started slipping, I ran consistent mid 12's, w/out LT's.

Detoxx03

iTrader: (14)

Every penny

SOMbitch

iTrader: (8)

I saw your post in the Dyno section. I had always wanted to see an actual dyno of this instead of just manufacturers claims. Great job

SIC LSX

iTrader: (10)

yes! I have ASP pulley and love it! But summit has a nice one that is only $150

blackZ28LS1

iTrader: (2)

thanks for all the info guys, really appreciate it