under drive pulley
They can be worth it.. I put one on my car more for the fact that I got one at a deal I couldn't pass up on...
If you get a good one, they do sometimes offer better vibration damping which could help your bearings last a bit longer, theoretically that is.
If you get a good one, they do sometimes offer better vibration damping which could help your bearings last a bit longer, theoretically that is.
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i researched it before i bought my March 25% and couldn't find any real evidence that it made more power.....alot of folks said they ran the same times at the track before/after UD installation.....i can't really give any performance feedback on mine because i did the pulley, LS6 intake, headers, and true duals all at the same time.....only thing i can say is now my belt squeaks & chirps until the car warms up and it sucks, i kind of wish i had the stocker and my $225 back
TECH Apprentice
Joined: Dec 2006
Posts: 343
Likes: 1
From: Petaluma, Ca
7-10 hp WILL make a diff at the track. General rule of thumb is every 10rwhp=~.1 and 1mph in the 1/4. It held true for me as I added power over the years.
On The Tree
Joined: Apr 2008
Posts: 194
Likes: 0
From: Camano Island Wa
i have seen dyno test's of 7-10 hp. that wont make a diff at the track but if you add 10hp here and there it will make a differance. just don't expect to feel a huge differance when you put it on.
under driving the alternator? Hmmm... Do your headlights go dim at night when idling at a red light?
...and slow turn signals. Don't know if it was really worth it as this was my first UD pulley.
but hey 10hp is 10 hp.
The ASP UD pulley's are nice. Felt a little faster throttle response and picked up almost 2 tenths at the track with bolt-ons. I put one on my 6.0 truck and didnt notice any difference at all but then again its a 6800# truck LOL
