Pulley Size/Fitment: Z34 vs. R35

XwChriswX

Isn't the Z Internally dampened...

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Bonnie - Stage 2, Audio build coming this fall!
R.I.P. Abby 3/29/10 - 3/30/14

sloboi

NO. It is internally BALANCED. Torsional vibration will happen at the ends of a rotating shaft. That's where a damper comes in.

XwChriswX

Ah, thought those were being used interchangeably, my bad.

__________________

Bonnie - Stage 2, Audio build coming this fall!
R.I.P. Abby 3/29/10 - 3/30/14

sloboi

Our stock pulleys actually do have SOME dampening characteristics. If you've ever seen a stock pulley, it has a rubber ring running the circumference of the bottom of the pulley. This ring will essentially absorb energies at a specific wavelength, lessening the effects of torsional vibration--however, as discussed many times before, some feel this little rubber ring is not sufficient for true dampening. IF IT WERE, companies like Fluidampr and ATI wouldn't exist...

7419sundat

Firing order, stroke, bore, crank length, combustion and most used operating Rpm ( many more im sure) determine how the engineers create these dampners. IF NOT those companies like ati and fluidampr could just make one end all be all dampner.

sloboi

Yeah...I mean...yes and no, right? Torsional vibration isn't magic. It's not like there are different TYPES of torsional vibration. The focus of the silicon/rubber is to absorb vibrational energies. The vibration is created by the turning of a weighted shaft between the two pivots. Assuming that the GT-R and 370Z have a similar weighted/length crankshaft, the vibrations would be similar at similar RPMs.

Torsional vibration isn't magic.

7419sundat

I forgot to mention magic...

sloboi

I was being sarcastic, but you see where I'm coming from. Combustion would have NOTHING to do with torsional vibration. Why mention it?

Jordo!

Hmm... I thought they'd custom make dampers if special ordered.

I think the stock part is probably desirable then -- the torsional vibrations associated with the GT-R motor may be different, so the dampening may be greater or lesser than needed for your application. In any case, lots of boosted Z34's are running the OEM damper without incident, so it should be fine.

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Enjoy it. Destroy it.

sloboi

There are already not a lot of boosted 370Z's out there. Of those that are, a few have have had problems. Torsional vibration will rear its head in the failure of other components (the oil pump, apparently, a common one). If I can spend $600.00, and simply reduce the chances of my vehicle running out of lubrication when driving, that's $600.00 well spent.

I do thank you all for your opinions and advice. I'm just going a route no one's gone before. Could work. Could not. Trying to use my limited understanding of physics, and some logic to figure things out.