Ditto, and the fact I have to change my pants now! :tup:

BTW, great article!

I haven't really noticed much difference. I think a lightweight flywheel would make a more noticeable impact on rev times.

LOL - love the gun, love Jay-Z, and love Thomas! GG you win!

lmao I just spit coke on my keyboard when I saw that picture. Thanks!!

I'll grab my spotlight back soon enough ;)

Hi. Thanks very much for going through the trouble of doing dedicated dyno pulls just for a pulley change. I think this really means a lot to the community and helps us with our upgrade decisions.

On a side note, do you notice any subjective change in noise/vibration/harshness?

Thanks,

-Phim
__________________

Nope. No NVH changes.

Will you be doing the alternator and idler pulley also??

Looks like the UD pulley is 195 and the other two are just another 140.

5 WHP for 200 is definitely worth it, and if the other pulleys can get another 5 or so would be great.

It is on the list for R&D and production, but I know it's behind a couple of other projects, most notably some F/I projects.. :)

Down the road it's a good possibility..

Sorry to bring it back from the dead but this isn't the underdrive pulley but just the lightweight pulley? wow if there are no nvh changes and nothing else is sacrified at all, this could be the mod for people like me who want some ponies unleashed w/out raising db level in the cabin. Would u recommend it to serve that purpose semtex? as in there is literally zero sacrifice from stock? Thanks as always dude.

No, the install in this thread is the underdriven one (which is also light), not the standard diameter lightweight one. AFAICS there's no downside to putting it on, mine's been on for thousands of miles now.

Ah...got it. The underdriven pulley has no effect on the car's ability to produce juice for the accessories? Also, is it safe to assume that if you install just the light pulley as opposed to the underdriven one, the gains will be less pronounced? Thanks for all your help.

tbonesteak, I have an uninstalled regular sized lightened one if you are interested. Never used it, sitting on my desk as a paperweight.

The underdriven pulley is the one that does affect your accessories. The lightweight one (that RCZ is offering you) doesn't. In general, an underdriven pulley is going to slow down your AC, Power Steering, and Alternator at idle / low rpm, which may in turn reduce your available amps of current at idle, etc. Personally I think the effects are no big deal, but esp. if you plan on adding a monster sound system, you might want to consider that...

Haha i guess i didn't word my question properly...but i knew that the underdriven pullies affect the accessories. I was just asking on your personal experience how much you feel it has an effect. What are the differences in the gains between the regular lightweight one and the underdriven one? RCZ, i'll let you know if i want them. Just depends on if the numbers are worth doing the swap for. Thanks.

cant u get both the lightweight pulley and underdriven pulley?