pietrino

iTrader: (1)

If i install an upgraded main pulley on my car, an RX 7 of 1993,
Wich different will give to me in good and bad????
And the water pump and alternator pulley????
Tanks guys, you are my best knowlege
Pietro De Lorenzo

Trexthe3rd

The procedure to change out the main drive pulley is difficult at best. The power gain is not significant. I know, because I have the full set of under drive pulleys. You might get a total of 10-15 hp gain from the full set of pulleys, but you will need newbelts and a good 1-2 days of free time to do the install.

Nameless

Good: More usable horsepower for ur engine, slowing down your accesories; possibly extending their life

Bad: If the pulleys are too large they lower the RPMs on the accesories so much that at idle you will loose power to them. Best example are the lights dimming at a stop.

That's all I've been able to find out. Hope that helps.

Jason

iTrader: (5)

I usually tell people to go with the Greddy pulley set which is the water pump/alternator pulleys and the unorthodox mainpulley. I dont recommend installing the unortho pulley unless you know what your doing. There are other alternatives like the Pettit mainpulley that is very easy to install.

Jason
www.rx7store.net

Wargasm

Hello,

I have the Greddy alternator/water pump pulleys with the Unorthodox "R" (single pulley model) main pulley. I no longer have the A/C or P/S or airpump.

You will need approximately a 29 inch 5 rib belt to run that setup for the alt/wp. If you're in a pinch finding a 29 inch 5 rib belt.... I bought a Goodyear "4060290" belt and cut off one rib carefully with a pair of scissors.

I think that according to Max Cooper you can also use a Gates K050290 belt. I'm guessing that from the part number this is a 5 rib 29 inch belt. I couldn't track this one down, so I ended up hacking the Goodyear 6 ribber up. I have not tested this setup on the street YET... maybe tomorrow. I'm 99.9% sure that there won't be a problem from me cutting a rib off.

Regards,
Brian

87 TII
93 R1

AARotary

Check this out maybe it will help you out.
http://reganrotaryracing.tripod.com/unxhoror.htm