Does any company make stock sized billet pulleys? I have had them on other cars and the weight difference is great. I dont feel like underdriving anything.

Thanks

 

From what I've seen, there don't seem to be any aftermarket stock sized pulleys available for the 2nd gen besides the dual belt alternator pulley. All are underdrive.

 

Gah, some company should start fabbing these up, Theirs hp to be free'd up!

 

Hardly worth the effort.

 

I thought Mazdaspeed had some pulleys? Maybe HAD is the keyword.

 

what bout srmotorsports?

 

http://www.srmotorsports.com/sr86plly.html

this is the only aftermarket pulley set I know of, for 2nd gen rx7

but there under drive...

 

http://rx7cz.net/shop/

 

http://www.atkinsrotary.com/store/pr...cat=456&page=1
i dont know what its made from but im sure this will add some power

 

Are these underdrive pullies worth the $400+? I've always wondered about it and I would like to see how well it helps.

 

It depends on the Engine, car and setup.

Generally the lighter pullies allow for faster reving and response. Actual power increase is not much though, usually about 1hp - 3hp per pound removed from the stock setup. but you also get faster respons which helps too.

In the case of my truck, it makes a differnce since it loses almost 15lb from the stock setup.

I don't have a clue what they are like on these cars though.

 

Does anyone know if those underdrive pullies are worth that much money? Or how much the stock ones weigh?

 

speaking of pulleys - i cant for the life of me remember what they were called, but the 3 pulleys were splined and used a fairly large belt (maybe 2" wide)

something kinda like this:

 

Gilmer drive ^

 

pulleys arent worth it in my opinion... the price to power ratio just doesnt cut it

 

Well ive done it on my old B16 in my honda and it made a BIG diff and i had it for my old Rx and it did give alot of power. There was a Co that made pulleys and they did it for a 87 Rx and dinoed it and it made a 10hp diff but thats with all 3 so its not bad $40 to every 1hp not bad

 

unorthodox(i guess that is how is spelled)use to make a set,i had 2 sets left at my keystone warehouse in PA(PEP BOYS WAREHOUSE)and we could not sell them cause they got recalled(that was like 3 years ago)i still have the part number if anybody is interested

 

thank you!


now just to find someone who sells them...

 

someone at megan racing contacted me b4 about making rear suspension links for the fc.. i wonder if i can ask him if they would do pulleys.. hmmmm

 

I would like to see if it does make any difference but If I do buy a pulley set it won't be for a while. Too many other places of my car need money lol.

 

just for future ref where can i buy lighter pulleys besides srmotorsports?

 

Cyl engines crank pulley a harmonic balncer, so it has some weight to it. A better upgrade for cyul engines is a harmonically balanced lighter crank pulley, not jsut lightened alluminum.

Rotaries use front and rear counterweights. My t2 pulley weighs close to nothing. I would just look into underdrive pulleys, lighteneing the crank pulley would not do much

 

what is that part number i deal with keystone almost on a daily bassis

 

ultra s undredrive pulley part#028107 and the whole pulley kit is 0281073,you need to ad 01 at the end of the part number for black,02 for polished aluminum,03 for red or 04 for blue

 

If you find them be sure to post the price!