rx7 alternator upgrade
#4
FD pro licensed driver
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Originally Posted by rwdburnout
ok found it so how much better is the fd alt
its 7.3 times better if your going over 25 mph but not under, and 17 times better if you have a NOS sticker on your car. There has been rumors that mutiple NOS stickers can double performance of your alt.
#6
Lives on the Forum
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Off the top of my head, the s4 alt is 60 Amps, the s5 is 70, and the FD is 100. So the FD alt is a much better alt, but its not bolt-on. You have to change over the pullies and put in a spacer or something. If you have an s4 you have to switch over a plug as well. If you have an s4 you can also just upgrade to an s5 alt, but it also requires changing over the plug.
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#8
The Cause of Death
Originally Posted by Sideways7
Off the top of my head, the s4 alt is 60 Amps, the s5 is 70, and the FD is 100. So the FD alt is a much better alt, but its not bolt-on. You have to change over the pullies and put in a spacer or something. If you have an s4 you have to switch over a plug as well. If you have an s4 you can also just upgrade to an s5 alt, but it also requires changing over the plug.
The s3 is a 60 or 65 amp alternator, I believe.
I "upgraded" from my s4 alt to an s5. Very simple, just change over the plug... DO NOT **** up the wiring though. Found it held voltage a little better with more loads on the motor compared to my s4, obviously due to the extra amps.
#9
Opinions are like........
http://rx7.subbuteoclub.com/electrical.shtml
http://www.rx7.org/public/altxref.html
Click on picture here:
https://www.rx7club.com/showthread.p...42#post6156742
Also, a simple bump in idle, and cleaning all the power/ground contacts, or replacing/upgrading the 20 year old cables, will do plenty!
http://www.rx7.org/public/altxref.html
Click on picture here:
https://www.rx7club.com/showthread.p...42#post6156742
Also, a simple bump in idle, and cleaning all the power/ground contacts, or replacing/upgrading the 20 year old cables, will do plenty!
#14
Scream baby Scream!!!
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A 13b is a 13b. All the alt's will fit. I have put fd's on fc's and fb's without any changes other than shaving the mounting bracket to clear the dizzy on a fb and the plug. I have a fd on my fb. All i did was change the pulley, make a harness about 6 inches long that plugs straight into my fb harness and into the fd alt, then bolted it straight on, no fab at all and it makes a hellified difference, especially if you have a lot of **** on your ride.
#20
Cake or Death?
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BTW, several Mazdas use the same frame (body) as the FD/FC. I'm using one from a mid-90's 626 (IIRC) that tested at 110A output.
Has the same shaft diameter as the FD, so my already modified FC pulley fit right up.
Electrical connections were plug-n-play for a S5.
#21
T2 Duo!
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Mounting ear spacing and location are a factor as well, not so easily changed if the pulley isn't lining up properly.
BTW, several Mazdas use the same frame (body) as the FD/FC. I'm using one from a mid-90's 626 (IIRC) that tested at 110A output.
Has the same shaft diameter as the FD, so my already modified FC pulley fit right up.
Electrical connections were plug-n-play for a S5.
BTW, several Mazdas use the same frame (body) as the FD/FC. I'm using one from a mid-90's 626 (IIRC) that tested at 110A output.
Has the same shaft diameter as the FD, so my already modified FC pulley fit right up.
Electrical connections were plug-n-play for a S5.
#23
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Ok, this really interests me. I would try to save on gas when I travel by not reving much on my RX-7. So I would only drive it to about 3000rpms. After awhile I notice that the battery would get weak. Hard starting and sometimes the battery would die out. So later I read that a RX-7 must be driven at a higher RPM to maintain the good running/operation of the car. So I would drive my car a little harder, 4500 rpms or higher. This actually seemed to help. The battery life stayed strong but I did loose on gas mileage. So does replacing the alternator (FC-S5) to a FD help so much that I won't have to drive my RX-7 at the higher RPMs? I would like to get back down to 3000 rpms and 300+ miles a tank. Does anybody know?
#24
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I have have gone through too many alternators on my t2 with aftermarket turbo etc.. they sound like a music box when turned by hand. can the stock alt. not handle 325+hp or not handle high revs? will the fd alternator upgrade handle the revs better without trashing the alt? I had a new s5 alt put on 6 months ago after dyno tuning, now it has failed also.
#25
Banned. I got OWNED!!!
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I have have gone through too many alternators on my t2 with aftermarket turbo etc.. they sound like a music box when turned by hand. can the stock alt. not handle 325+hp or not handle high revs? will the fd alternator upgrade handle the revs better without trashing the alt? I had a new s5 alt put on 6 months ago after dyno tuning, now it has failed also.