Troux

iTrader: (4)

From searching I've seen people say March is the best all-around pulley, though a bit heavier than the ASP.
I am wondering a couple things...

1) What's going to be the difference between a pulley with and without the fluid dampening? The sales pitch says it prevents ignition issues, but I haven't heard of any complaints from people with an undampened pulley.

2) The March seems to be $30 cheaper than the ASP, so why would anyone prefer the ASP?

3) I see the March is sometimes sold with an alternator pulley. Is this an underdriven or overdriven pulley?

4) I know ASP makes an underdriven alternator pulley, and I wondered if this would be alright for a car that sees decent street time, but is by no means a daily driver (No AC or PS, basic 4-speaker stereo, HIDs, small battery).

5) If by a long shot, someone has seen these next to each other, is one any bigger than the other in terms of overall diameter?


Thanks in advance!

01ssreda4

iTrader: (96)

if the pulleys claim to be the same percentage under-driven then their diameter where the belt rides should be virtually identical. also, the extra alternator pulley would be considered over-driven. since its spinning slower with the addition of the under-drive crank pulley, swapping out the alternator pulley to a smaller pulley would then speed it back up to stock speed.

Troux

iTrader: (4)

Yeah, the running diameters are likely identical, I just didn't know if one had more lip or anything else. I'm mainly getting it for the sake of clearance with a swap project.

I was under the impression that a smaller alternator pulley would give less charge? Either way, ASP sells under and overdriven alternator pullies.

BackinBlack02SS

iTrader: (7)

They are both dampers. They are both 25% underdriven, which means they are both about 5.5" in diameter. You might want to contact the manufacturers to see if the AC part of the pulley if also 25% underdriven. Do some research on fluid filled dampers, which the March is, and you can make the concusion which is best. BTW, a smaller crank pulley will slow the accessories. A smaller accessory pulley will turn faster.

DiabloFormula

iTrader: (58)

I have the March setup and like it, clean looking and I have no problems with it.

Troux

iTrader: (4)

^The same has been said for every kind of damper countless times. There's got to be some logic in determining the "best," at least for specific applications. That's what I'm after.

You were right on the overdriven alternator pulley being smaller. Seems like turning the pulley faster and reducing weight would make a smaller alternator pulley a no-brainer. I don't see a downside, and don't see why anyone would opt for the larger-than-stock underdriven alternator, since it would add rotating mass while reducing charging power...?

All I could find from research was that a fluid damper is more effective at damping over a broader RPM range, for longer engine life. I just don't know how this translates into power, or how it prevents retarding timing.

BackinBlack02SS

iTrader: (7)

You have to decide what is best for YOU. How much rpm will you be turning, wht kind of crank, etc. In motorsports there are very few definitive "bests." Just because you are reducing the weight of the pulley, is it offseting the added power it takes to turn the alternator faster? These are the things you must think about when "modding."

Troux

iTrader: (4)

That's what I'm trying to do, but I can't make an intelligent decision if I don't know what the benefits of each setup are. It's a bolt-on LS2 (stock long block and intake). I'm just the kind of person that likes to fully understand everything I touch and "mod."

SOMbitch

iTrader: (8)

I chose a March because from my research it was the the best at absorbing the torsional vibrations from the crank thus providing less stress on the bearings in theory. Does that mean I am right?? No! Just my choice.

Is the ASP lighter? Yes. Will you be able to feel it? No! Does it actually dampen as well?? Dunno really, so..... Make your choice just like I did