Opinions on underdrive pulleys
TECH Resident
Joined: Feb 2002
Posts: 843
Likes: 0
From: Roseville, Ca.
If you get a 25%, I'd recommend an alt pulley also, or you may have charging issues. I have an ATI Superdamper (10%) it's pricey, but a quality pulley. The increments on it are cool also for hand spinning each cylinder to TDC, etc.
Last edited by Steve Gunn; Mar 19, 2011 at 06:38 AM.
thanks for the info guys, I'll look into some pulleys. I'm leaning towards 25% but just wanted to see who's running 10% and the real difference. Motor will be mated with a t56. Also where would be a good place to pick up the balancer and alt pulley? Lq9 set up is basically the same as ls1 correct?
Trending Topics
Launching!
Joined: Oct 2010
Posts: 257
Likes: 0
From: Ottawa, Ontario, Canada.
I am in the same place, SLP has a 25% UD at Jegs for $300 but no alt pulley. March has a crank/alt pulley for around the same, I think I will go with them as they are known for their drives among others.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
TECH Fanatic
Joined: Aug 2004
Posts: 1,373
Likes: 4
From: Auckland, Nth Is, New Zealand.
Launching!
Joined: Oct 2010
Posts: 257
Likes: 0
From: Ottawa, Ontario, Canada.
That's interesting, is there that much difference in idle? I was also wondering by using the alt pulley or not would affect the load on the drive (ie: more or less free HP) or is that dependent on the voltage reg and charging rate? Also, would not having an alt pulley drag the alternator down when idleing under load from a/c, e-fans, blower motor, power accessories?
http://www.summitracing.com/search/m...1/?Ns=Rank|Asc
I'm confused, i just want to make sure i get the right one. It will be going on a lq9 with stock accessories. thanks
I'm confused, i just want to make sure i get the right one. It will be going on a lq9 with stock accessories. thanks
I have been running the Ebay 25% UD pulley for a couple years now, car makes good power, has seen almost 7k rpms multiple times, never any problems. dont remember who makes it though.
Normally this would be the case but with an ati it is actually on of the only true dampeners that exceeds oem specs and has shown that it will dyno the same or sometimes more that its 25% economic counter parts i too got mine from ebay as a blem item.
