I would like to know who they all are and maybe a web address to check them out would be great, What is the most common here on these boards and in the general public?

 

unorthodox racing has an underdrive.
kjr has a lightwt non-underdrive.

 

www.kjrperformance.com

 

Yep... the KJR piece rocks! We saw a few at ZDayZ (and gave one away as a prize!). They are very well crafted and very, very light!!!

 

our latest batch supply is running low.... were out of billet again but have black in stock
more coming from the manufacture soon....

 

Which is better?
Which is safer?

 

KJR is safer bc it isnt underdrive just a lighter version of the stock but how do you install it? Also what are the typical gains?

 

Im sure the install is the same for any crank pulley. I would think the udnerdriven pulley will show more gains because its mroe then jst a light weight options.

I remember on the BMWs i use to run the light weigh crank pully would gian you about 3-5whp as the udnerdrive would gian you 5-9whp

Both are safe. As long as you dont underdrive the crnak and run a lightweight flywheel. Its all good from there

 

why not run a underdrive pulley with light weight flywheel?

 

A lightweight flywheel throws off the harmonic balances and a crank pulley throws of the harmonic balances. the two together throw the harmonic balances off so far that serious damage WILL occur to the engine. I am trying to locate my harmonic balance tech sheet. will post it a.s.a.p

 

thank you ^_^

 

Your claim is NOT what I have heard. Back it up with data/sources.

 

The part about flywheel is ********, our stock flywheel is a 2pice design and it doesn't have any harmonic balances. I'm not sure where you have made that up. Also crank and flywheel are balanced independently, why do you think that nismo sells their own lightweight flywheel.

 

So it is safe to get both!? Cuz the light wieght flywheel and crank pully where the next two things on my list!

 

www.kjrperformance.com has a dyno before and after with the KJR on it. You can expect approximatley 8 hp to the wheels with this pulley. Stock pulley weight is 6.4 lbs and the KJR is 2.02 lbs