Identifying aftermarket pulleys

FastZ... · 11-03-2011, 03:50 PM

I just bought a 2010 370Z from a dealership which has some work done; full FI exhaust, LED's, and some other aftermarket products. I'm trying to figure out if the previous owner bought UpRev and/or replaced the stock pulley with either a lightweight or an underdrive. Is there anyway I can tell if I have UpRev or pulleys just from looking? My voltage meter is always right at 14 or a little above... I know this isn't much help.

All of the pulleys look to be black EXCEPT for the crank pulley which looks to be polished or aluminum of some sort. Here are the best pic's I could get....

Thanks!

XwChriswX · 11-03-2011, 04:05 PM

You'll get a better angle from under the car, just remove the plastic trim piece.

It might just be a lightweight pulley if it's just the 1.

FastZ... · 11-03-2011, 04:14 PM

Yeah - but can't you buy just an underdrive pulley? Right? Isn't that what people do, buy an underdrive pulley and get a Gates belt?

XwChriswX · 11-03-2011, 04:17 PM

Quote:

Originally Posted by FastZ...

Yeah - but can't you buy just an underdrive pulley? Right? Isn't that what people do, buy an underdrive pulley and get a Gates belt?

If you just get an Underdrive pulley, the system will be slightly off. That's why NST makes the Overdrive Alternator pulley to balance everything out. So you still run @ 14v.

FastZ... · 11-03-2011, 04:36 PM

Will an underdrive produce more noticeable power gains than a lightweight? I have an underdrive from Stillen that just came yesterday - I was just waiting on the Gates Belt. I think it's obvious that I have an aftermarket pulley - not to mention my car runs pretty well - with the full exhaust. I mean, I light stock Z's up.

XwChriswX · 11-03-2011, 04:39 PM

Quote:

Originally Posted by FastZ...

Will an underdrive produce more noticeable power gains than a lightweight? I have an underdrive from Stillen that just came yesterday - I was just waiting on the Gates Belt. I think it's obvious that I have an aftermarket pulley - not to mention my car runs pretty well - with the full exhaust. I mean, I light stock Z's up.

Both the lightweight, and the underdriven pulleys are doing the same thing. Less rotational mass = faster through the RPM band. Different methods of the same goal. Even though your gains will most noticeably be seen from your being tuned for these mods.

Don't mention that part.

wstar · 11-03-2011, 09:20 PM

Looks like Stillen's pulley, but I couldn't tell you if it was just lightweight or also underdriven. The Underdriven one is *also* lightweight, with the added benefit of reducing parasitic drag from the A/C, power steering, etc. But then again it underdrives the alternator, hence the whole overdrive alternator pulley thing from NST. You can run on just an underdriven crank though, especially if you've got a healthy full sized battery in the stock location.

11-03-2011, 04:05 PM	#2 (permalink)
XwChriswX WFLYIDNNE Join Date: Jul 2009 Location: In The Fastlane Posts: 50,648 Drives: 02 GDB WRX Rep Power: 451	You'll get a better angle from under the car, just remove the plastic trim piece. It might just be a lightweight pulley if it's just the 1. __________________ Bonnie - Stage 2, Audio build coming this fall! R.I.P. Abby 3/29/10 - 3/30/14

11-03-2011, 09:20 PM	#7 (permalink)
wstar A True Z Fanatic Join Date: Mar 2009 Location: Houston, TX Posts: 4,024 Drives: too slow Rep Power: 3594	Looks like Stillen's pulley, but I couldn't tell you if it was just lightweight or also underdriven. The Underdriven one is also lightweight, with the added benefit of reducing parasitic drag from the A/C, power steering, etc. But then again it underdrives the alternator, hence the whole overdrive alternator pulley thing from NST. You can run on just an underdriven crank though, especially if you've got a healthy full sized battery in the stock location. __________________ 7AT Track Car! Journal thread / Car setup details Last edited by wstar; 11-03-2011 at 09:27 PM.

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11-03-2011, 04:14 PM	#3 (permalink)
FastZ... Base Member Join Date: Oct 2011 Location: Reston, VA Posts: 7 Drives: 2010 370Z Black,6spd Rep Power: 13	Yeah - but can't you buy just an underdrive pulley? Right? Isn't that what people do, buy an underdrive pulley and get a Gates belt?

11-03-2011, 04:36 PM	#5 (permalink)
FastZ... Base Member Join Date: Oct 2011 Location: Reston, VA Posts: 7 Drives: 2010 370Z Black,6spd Rep Power: 13	Will an underdrive produce more noticeable power gains than a lightweight? I have an underdrive from Stillen that just came yesterday - I was just waiting on the Gates Belt. I think it's obvious that I have an aftermarket pulley - not to mention my car runs pretty well - with the full exhaust. I mean, I light stock Z's up.