Underdrive Pulley - Page 2 - RX8Club.com

Underdrive Pulley

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Old 12-14-2011, 09:21 AM
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Based on my inexperienced opinion, I would not use those.
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Old 02-13-2012, 06:17 PM
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Just wanted to confirm the AP Pulley DOES fit on the s2 with no issues. The way it's machined if the holes aren't lining up, you just have to 180 it and everything lines up as it should. I'll also agree with what has already been mentioned, there's no noticeable gain or difference from stock.

Last edited by MinHoSII; 02-14-2012 at 03:26 AM.
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Old 02-13-2012, 08:27 PM
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Originally Posted by MinHoSII View Post
Just wanted to confirm the AP Pulley DOES fit on the s2 with no issues. The way it's machined if the holes aren't lining up, you just have to 180 it and everything lines up as it should. I'll also agree with what has already been mentioned, there's no noticeable gain or difference from stock.

Now to deal with my check engine light for cylinder 2 misfire
I tried all that still had no luck...i end up just selling my pulley.

Last edited by RMXG8; 02-13-2012 at 08:31 PM.
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Old 02-14-2012, 03:21 AM
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Waste of $$$'s as usual...
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Old 02-14-2012, 08:50 AM
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Originally Posted by MinHoSII View Post
Just wanted to confirm the AP Pulley DOES fit on the s2 with no issues. The way it's machined if the holes aren't lining up, you just have to 180 it and everything lines up as it should. I'll also agree with what has already been mentioned, there's no noticeable gain or difference from stock.

Not sure why yours fit bro, but we turned mine every way imagineable and no way that thing was going on my car .... so I guess there's a possiblility your car received the s1 version from the factory for the pulleys .... which i've heard happens sometimes .... but wasn't anyway they were fitting on mine.

From what i've read, pretty much a complete waste other than appearance anyway.
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Old 02-15-2012, 12:14 AM
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Originally Posted by bcdjudo7 View Post
Not sure why yours fit bro, but we turned mine every way imagineable and no way that thing was going on my car .... so I guess there's a possiblility your car received the s1 version from the factory for the pulleys .... which i've heard happens sometimes .... but wasn't anyway they were fitting on mine.

From what i've read, pretty much a complete waste other than appearance anyway.
Hmm yeah not sure, to be honest it barely ranks as an appearance mod you can hardly see it lol.
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Old 11-23-2013, 05:52 PM
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Originally Posted by RMXG8 View Post
i tried to install the ap pulley on my 09 the hole for the bolts didnt line up.anyone have this problem?
flip it 180 degrees. it only goes on one way, so i bet you had it upside down
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Old 04-23-2018, 05:45 PM
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Mine worked on an S2, but there was a CEL for the first 50 miles or so.
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Old 04-24-2018, 08:25 AM
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A CEL from a pulley? What was the code?
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Old 04-28-2018, 12:14 AM
  #35  
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Yeah, better check it out.

The only pulley that's safe to underdrive is the AC pulley, but then you may as well just remove the AC altogether.
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Old 04-28-2018, 12:36 AM
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Originally Posted by UnknownJinX View Post
Yeah, better check it out.

The only pulley that's safe to underdrive is the AC pulley, but then you may as well just remove the AC altogether.
wrong again
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Old 04-28-2018, 01:06 AM
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Mind to elaborate?

Most of the posts before have said it's not worth it, and the explanation from RIWWP makes sense.

Pulleys
Don't. You might ask "why?", so here is an explanation:

There are 2 "benefit" points to changing to aftermarket pulleys.
The 1st "benefit" is a reduction in the weight of the pulley. This is a similar concept to going with a lightweight flywheel to assist with a more responsive engine. The problem is, the weight you are saving is very very very small, and it's close to the center of rotation, so there is very little gain by reducing it. It takes roughly 10lbs of weight saved at inch from the center of rotation to equal the interia savings of 1lb of weight saved at 10 inches from the center of rotation. Lightweight flywheels are still rather large in diameter (almost larger than the core engine block), and much of the weight stripped is near the outside of the flywheel. Pulleys have only a few inches and at most maybe a pound, and most of the weight to remove is near the center. It just isn't going to give noticeable gains for the price.
The 2nd "benefit" is to underdrive one or more accessories. The problem with this is that under driving your alternator is bad for your electronics and battery, and underdriving your water pump can have significant penalties to your ability to keep the engine cool. And all it takes is 1 overheating, or even undetected localized hot spotting, and your housings can warp and your engine is done. Underdriving your A/C is without penalty, but removing the AC system completely would accomplish the same AC effectiveness as underdriving it, and leave your car lighter and without the AC compressor drag at all, so it's the better choice (and cheaper).

Last edited by UnknownJinX; 04-28-2018 at 01:13 AM.
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Old 04-28-2018, 02:20 AM
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Originally Posted by UnknownJinX View Post
Mind to elaborate?

Most of the posts before have said it's not worth it, and the explanation from RIWWP makes sense.
Your assumption that water cooling will suffer is wrong . In fact it is known amongst those who track the 8 that the stock pump gearing can lead to water pump cavitation at redline . A small underdrive is beneficial except for those that sit in traffic at idle a lot.
Same for the alternator. Underdrive only a negative for those that either sit in traffic a lot or run a large electrical load.

The overall benefit is indeed small however. FWIW i don't run one with a turbo setup .... but I don't rev to 9000 either .
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Old 07-14-2018, 11:00 AM
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I can reply topics but cannot start one????
Any help Admins???
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Old 07-14-2018, 11:07 AM
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