Who makes dual-belt alternator pulleys for the FC?

Pete_89T2 · 06-06-2011, 06:36 PM

Subject is my question, specifically I'm looking for a dual-belt aternator pulley that is NOT an underdrive pulley. For a S5 if that makes any difference. Doing a little shopping on the net today, and I found a several places that sell underdrive pulleys, but none in the stock diameter.

Thanks,
Pete

RotaryDiagnostics · 06-06-2011, 06:52 PM

Have you tried Mazdatrix.com?

Pete_89T2 · 06-06-2011, 06:57 PM

Quote:

Originally Posted by RotaryDiagnostics

Have you tried Mazdatrix.com?

Yup, they sell them, but it's an underdrive design. For a street driven car that spends any significant time at idle, an underdrive pulley isn't suitable as the alternator won't produce enough juice to charge the battery and keep up with accessory loads.

jfaplanet · 06-07-2011, 01:47 AM

Re-Speed

tweiss3 · 06-07-2011, 07:10 AM

http://banzai-racing.com/store/86-91...lley_belt.html

infernosg · 06-07-2011, 08:06 AM

Too bad no one makes a smaller diameter alternator pulley (overdriven) to work with underdriven main pullies to maintain alternator output. I've been looking for a way to slow down the water pump for track use but also maintain alternator output for the few times the car sees street use.

jfaplanet · 06-07-2011, 09:42 PM

http://mrcmfg.com/catalog/product_in...roducts_id=393

bah2792 · 06-08-2011, 07:54 PM

Type in Rx7 Pulley on ebay. There is a guy in Florida that sells OEM outside diameter pulley's with 2 belts. Got some for my car last year. They are in chrome and black. Just looked on ebay and they are there now.

Pete_89T2 · 06-08-2011, 07:56 PM

^ Using my stock S5 alternator pulley as reference, the Re-Speed pulley, at 2-5/8" diameter per their website is the same exact diameter as stock, so it wouldn't help infernosg, as he's looking for an overdrive pulley (to net a stock ratio when paired with an aftermarket underdrive e-shaft pulley). It works for me though, since I still have my stock e-shaft pulley.

06-06-2011, 06:36 PM	#1
Pete_89T2 Lifetime Rotorhead Join Date: Apr 2010 Location: Elkton, MD Posts: 874 Rep Power: 16	Who makes dual-belt alternator pulleys for the FC? Subject is my question, specifically I'm looking for a dual-belt aternator pulley that is NOT an underdrive pulley. For a S5 if that makes any difference. Doing a little shopping on the net today, and I found a several places that sell underdrive pulleys, but none in the stock diameter. Thanks, Pete

06-07-2011, 01:47 AM	#4
jfaplanet Rotary Fanatic Join Date: Feb 2008 Location: Smyrna, TN Posts: 134 Rep Power: 18	Pulley Re-Speed

06-07-2011, 07:10 AM	#5
tweiss3 Mazda Lover Join Date: Aug 2010 Location: Akron, Ohio Posts: 319 Rep Power: 15	http://banzai-racing.com/store/86-91...lley_belt.html __________________ 2004 Mazda6 V6 5-spd - still waiting on money for a motor 1991 Mazda RX7 NA 5-spd - my new DD with 145,000 miles

06-07-2011, 08:06 AM	#6
infernosg IT'S ALIVE! Join Date: Dec 2009 Location: Richmond, VA Posts: 811 Rep Power: 16	Too bad no one makes a smaller diameter alternator pulley (overdriven) to work with underdriven main pullies to maintain alternator output. I've been looking for a way to slow down the water pump for track use but also maintain alternator output for the few times the car sees street use. __________________ '86 Mazda RX-7 Base '79 Mazda RX-7 GS

06-07-2011, 09:42 PM	#7
jfaplanet Rotary Fanatic Join Date: Feb 2008 Location: Smyrna, TN Posts: 134 Rep Power: 18	Re-Speed http://mrcmfg.com/catalog/product_in...roducts_id=393

06-06-2011, 06:52 PM	#2
RotaryDiagnostics Compression Tester Man Join Date: Feb 2009 Location: Mont Alto, PA Posts: 137 Rep Power: 17	Have you tried Mazdatrix.com?

06-08-2011, 07:54 PM	#8
bah2792 The Newbie Join Date: Sep 2009 Posts: 10 Rep Power: 0	Pulley Type in Rx7 Pulley on ebay. There is a guy in Florida that sells OEM outside diameter pulley's with 2 belts. Got some for my car last year. They are in chrome and black. Just looked on ebay and they are there now.

06-08-2011, 07:56 PM	#9
Pete_89T2 Lifetime Rotorhead Join Date: Apr 2010 Location: Elkton, MD Posts: 874 Rep Power: 16	^ Using my stock S5 alternator pulley as reference, the Re-Speed pulley, at 2-5/8" diameter per their website is the same exact diameter as stock, so it wouldn't help infernosg, as he's looking for an overdrive pulley (to net a stock ratio when paired with an aftermarket underdrive e-shaft pulley). It works for me though, since I still have my stock e-shaft pulley.