Gains with UD pulley w/ graph & vids
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#4
SLP 25%. I was very concerned of any side effects but so far there have been none. I feel like the car still has more power in it too. Might need a stronger clutch soon.
#5
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#16
We do have a gp sale on the powerbond pullies and install tool. Powerbond makes the slp pulley. 25% ud is great. 10% seems like a waste imo. We also have the od alt pullies for those worried about charging issues.
#18
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What kind of effect on the A/C are you guys seeing w/ the ATI 10% under drive pulleys? Mine already doesn't blow very cold (need to take it to an A/C shop soon to get that fixed) and wondering how much an effect the ATI 10% will have on it.
#20
Torsional shock and the harmonics produced by the engine are what is "dampened" or reduced/absorbed. The torsional load is put on by the firing of the cylinders. When each one reaches the combustion event, the piston speeds up and puts a torsion or twist on the crankshaft, speeding it up, then another cyl fires and twists the crankshaft again and speeds it up again, then it flexes back. Those are the torsional vibrations that are absorbed by the balancers and the resulting harmonics that occur. The only ones that do not do that are the ones that are one solid piece. The balancer absorbs the shock so the rest of the engine does not feel the effects.
Tell me how much more different the ati is than the powerbond to be considered a true damper, and the powerbond is not then. They both use elastomer bands/rings to absorb the bad juju. Harmonics are not "chaotic". If they were, they would not be called harmonics.
The ONLY balancers I have had issues with are the one piece, the all alum, or the ones with alum hubs. ATI does offer an alum shell for alot of their balancers which cuts down on weight, but then you have different values for harmonic dampening between the 2 dissimilar metals.
The ATI is more expensive yes, and is considered as a higher quality balancer by many, but I would have zero hesitation to use the powerbond balancer in any application, and have in fact used them in nearly EVERY LS application from all stock to 1k hp supercharged setups.
The other balancers to look at are the Innovators West. They use a reported wet clutch pack to absorb the load/shock created by the engine.
Hard to tell which one is exactly the winner, but I can tell you which one is purchased more and used on more DDs/weekend racers than the others.