Pulley Size/Fitment: Z34 vs. R35
 

Alas...all this talk of torsional vibration has shaken me timid (pun indeed intended). I'll be going boosted very soon, and am looking for a replacement to the OEM crankshaft pulley. I've had the OEM size Stillen lightweight pulley installed for about 3000km with no discernible negative repercussions--that being said, I don't want to take any chances with the volatile mistress that is Forced Induction.

My internet detective skills have failed to yield any technical data on the stock R35 crankshaft pulley. Vital information such as diameter, serpentine ridge height (where the ridges start in relation to where the base of the pulley will sit), or even compatible belt width.

Using my eyeball deduction method, the R35 pulley and ours look very much similar in size--save the more robust extension downwards from the ridge, where our pulley just stops. From what I can tell, the "key" to the crankshaft it self is also the same.

What I would REALLY like, though I accept the unlikely hood of this request being answered, is a side by side picture comparison between the Z34 and R35 pulley. If they do indeed match, I will most likely purchase the Boost Logic GTR Crank Pulley, which is using an OEM size, and ATI's dampening technology.

Thank you all for your help, and have a greatastic day--supercalifragilisticexpialidocious, even.

I'm sure we have someone here who would be able to answer this.. But.. Have you tried contacting a gtr certified dealer on this? They should definitely be able to get that info for you since they always have a Z & gtr on hand.

I tried contacting my dealer, but they didn't have any GT-R pulleys sitting around...

Anybody here know anyone that manufactures the lightweight pulleys for our car and the GTR? I believe AMS makes one for both, but I'm inclined to think they will not reply my messages if I'm not buying their product lol.

In other words, BUMP =).

So just so we understand, you want to put a GT-R pulley, on a Z crankshaft?

:icon08:

Two different engines having different harmonics. Not recommended.

Just go with the OEM pulley for the Z34.

If you want something custom made that includes a damper, google Fluidampr.

But that shouldn't matter if I'm buying a harmonic damper--besides, considering similar bore, stroke, and overall similar construction of the two engines, I'm willing to bet a damper made for the GTR will still out dampen a stock 370Z pulley.

Fluidampr and ATI don't make pulleys for the 370Z yet. I've contacted both companies, and apparently "something is in the works." But considering that our engine uses the SAME pulley as on the HR 350Z engines, which have been out forever now...I'm not holding my breath.

Thats like saying this orange tastes better then that orange because it came from a bigger Tree... :ugh2:


6 to one, half a dozen to another br0. You're gonna waste a lot of $$ for no real gain... :ugh2:

Well, a DAMPENED GT-R pulley on a TURBO CHARGED 370Z. I was being pretty straightforward, no lines to read between.

I'm not trying to get a dampened pulley for gains...did you even ready my post? This is a preventative mod, for torsional vibration, which will be amplified by going boosted.

Isn't the Z Internally dampened... :ugh2:

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

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