Lets discuss alternators....
09-09-02, 10:27 PM
#1
Lets discuss alternators....
As many of you may know, the S4 alternator is a pathetic little device with a VERY low output. I was under the impression that any decent alternator shop could re-wire it for a higher output. I wanted it that way in order to maintain a stock appearance. Apparently nobody re-wires these type alternators. Anyone know if there is a place that does this?
I know that many people here have done other things, like put the S5 alternator in. What is the AMP rating for the S5 alternator? I also know that someone here is running a 200 amp alternator, but I lost the link and cant find the thread...
I need to get a solution to this problem soon, due to the monsoons here in Tucson, I sometimes have to drive with my lights, wipers, A/C, and cooling fans. Last time my running volts dropped to 8v at idle!
What have all of you done?
Rat
I know that many people here have done other things, like put the S5 alternator in. What is the AMP rating for the S5 alternator? I also know that someone here is running a 200 amp alternator, but I lost the link and cant find the thread...
I need to get a solution to this problem soon, due to the monsoons here in Tucson, I sometimes have to drive with my lights, wipers, A/C, and cooling fans. Last time my running volts dropped to 8v at idle!
What have all of you done?
Rat
09-09-02, 11:05 PM
#2
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Put a 2 guage wire between the postive post and the alternator output terminal in parallell with the stock 10 guage wire, and you will notice a huge difference in voltage..Max
09-09-02, 11:06 PM
#3
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Re: Lets discuss alternators....
Originally posted by J-Rat
Lets discuss alternators....
Lets discuss alternators....
I would check some online parts stores are get some amperage ratings .. there is ALOT of altinators with a similar design to the RX ones for other cars. I am sure you can get one from another car to work .. all you need to do is get a belt to spin it. You might have to do some minor facrication but in general most altinators are very similar in design ... and if you figure somthing out let us all know .. my lights dim when my music is loud (1200 watts)
Also you might want to consider a higher amprage battery .. a good battery should never drop near 8 volts even with a weak alt.
Last edited by Rpeck; 09-09-02 at 11:09 PM.
09-09-02, 11:11 PM
#5
Originally posted by Maxthe7man
Put a 2 guage wire between the postive post and the alternator output terminal in parallell with the stock 10 guage wire, and you will notice a huge difference in voltage..Max
Put a 2 guage wire between the postive post and the alternator output terminal in parallell with the stock 10 guage wire, and you will notice a huge difference in voltage..Max
09-09-02, 11:14 PM
#6
Re: Re: Lets discuss alternators....
Originally posted by Rpeck
Lets not and say we did
I would check some online parts stores are get some amperage ratings .. there is ALOT of altinators with a similar design to the RX ones for other cars. I am sure you can get one from another car to work .. all you need to do is get a belt to spin it. You might have to do some minor facrication but in general most altinators are very similar in design ... and if you figure somthing out let us all know .. my lights dim when my music is loud (1200 watts)
Also you might want to consider a higher amprage battery .. a good battery should never drop near 8 volts even with a weak alt.
Lets not and say we did
I would check some online parts stores are get some amperage ratings .. there is ALOT of altinators with a similar design to the RX ones for other cars. I am sure you can get one from another car to work .. all you need to do is get a belt to spin it. You might have to do some minor facrication but in general most altinators are very similar in design ... and if you figure somthing out let us all know .. my lights dim when my music is loud (1200 watts)
Also you might want to consider a higher amprage battery .. a good battery should never drop near 8 volts even with a weak alt.
Is that a good enough battery?
And thats what I am trying to find out, what have other people done. I want to have to make minimal mods. There used to be a thread on putting the S5 into the S4, I think that Rx7Impreza (justin) did it.
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09-09-02, 11:31 PM
#9
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Is this the one?
https://www.rx7club.com/forum/showth...hreadid=110075
I'm looking to beef things up, too. But I don't want to go screwing around chasing after belt and pulley sizes.
I've read about running a wire from the pos to the alt on a couple of 7 sites, but when I asked around about it about 50% of the feedback was 'you may fry your system.' So I didn't do it...
https://www.rx7club.com/forum/showth...hreadid=110075
I'm looking to beef things up, too. But I don't want to go screwing around chasing after belt and pulley sizes.
I've read about running a wire from the pos to the alt on a couple of 7 sites, but when I asked around about it about 50% of the feedback was 'you may fry your system.' So I didn't do it...
09-09-02, 11:40 PM
#10
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ya I kinda need a bigger one now I think... S5 one + redtop drops to 12.4 or so at idle now with e-fan and lights on. (and crane ign box, rewired fd fuel pump, 2 amps etc ) it should never get lower then 12, that means your battery sucks. if I hold it at 2000rpm it goes back up to 13.6 or so. and driving is 13.5+
that's all reading off the turbo timmer so it's probbaly a tad higher at the alternator.
) it should never get lower then 12, that means your battery sucks. if I hold it at 2000rpm it goes back up to 13.6 or so. and driving is 13.5+that's all reading off the turbo timmer so it's probbaly a tad higher at the alternator.
09-10-02, 12:06 AM
#11
Originally posted by Amur_
Is this the one?
https://www.rx7club.com/forum/showth...hreadid=110075
I'm looking to beef things up, too. But I don't want to go screwing around chasing after belt and pulley sizes.
I've read about running a wire from the pos to the alt on a couple of 7 sites, but when I asked around about it about 50% of the feedback was 'you may fry your system.' So I didn't do it...
Is this the one?
https://www.rx7club.com/forum/showth...hreadid=110075
I'm looking to beef things up, too. But I don't want to go screwing around chasing after belt and pulley sizes.
I've read about running a wire from the pos to the alt on a couple of 7 sites, but when I asked around about it about 50% of the feedback was 'you may fry your system.' So I didn't do it...
09-10-02, 12:08 AM
#12
Originally posted by Scott 89t2
ya I kinda need a bigger one now I think... S5 one + redtop drops to 12.4 or so at idle now with e-fan and lights on. (and crane ign box, rewired fd fuel pump, 2 amps etc ) it should never get lower then 12, that means your battery sucks. if I hold it at 2000rpm it goes back up to 13.6 or so. and driving is 13.5+
that's all reading off the turbo timmer so it's probbaly a tad higher at the alternator.
ya I kinda need a bigger one now I think... S5 one + redtop drops to 12.4 or so at idle now with e-fan and lights on. (and crane ign box, rewired fd fuel pump, 2 amps etc
) it should never get lower then 12, that means your battery sucks. if I hold it at 2000rpm it goes back up to 13.6 or so. and driving is 13.5+that's all reading off the turbo timmer so it's probbaly a tad higher at the alternator.
09-10-02, 12:16 AM
#13
https://www.rx7club.com/forum/showth...ght=Alternator
Here is a post about putting the FD alt in the FC. Looks like its the route I am gonna go. I just wonder where they got the new pulley.
Rat
Here is a post about putting the FD alt in the FC. Looks like its the route I am gonna go. I just wonder where they got the new pulley.
Rat
09-10-02, 12:27 AM
#14
https://www.rx7club.com/forum/showth...85#post1021285
Here is the one that RX-7impreza did. Although I think that I am gonna go with the FD alternator. Just need to figure out were to get a pulley.
Here is the one that RX-7impreza did. Although I think that I am gonna go with the FD alternator. Just need to figure out were to get a pulley.
09-10-02, 12:55 AM
#16
yeah, I got 70 amps for S4, 80 amps for S5 and 100 amps for FD. Only hitch with putting the FD into the FC is that you need a pully. The s4/s5 pully wont fit onto the FD shaft. Havent solved that dilemma yet. i am gonna start pricing the FD alternators.
09-10-02, 01:19 AM
#18
inteligent extratarestril
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I have a 70 amp S4 alternator and it sits on 14.5-14.7 volts all day long. I have no a/c, no heater, not this that and the other thing hahaha.
09-10-02, 08:07 AM
#20
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BUTT CONNECTORS
ive got a bit of a problem with my alternator,my old one was burned up(pd failure)along with the butt connector,so i just cut it off where the wire wasnt burned.how can i reconnect my alternator to my power harness with no butt connector?
Last edited by T04Eneedy; 09-10-02 at 08:09 AM.
09-10-02, 08:40 AM
#22
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I'm putting an FD alternator in my 88 this weekend. No big changes except for pulley. I got a dual alt pulley and had it drilled/bored out just a tad bit to get it too fit onto the FD alternator shaft. MikeL just did a writeup on his FD alternator swap in his 88. Good writeup.
09-10-02, 09:27 AM
#23
Originally posted by presetlimits
I'm putting an FD alternator in my 88 this weekend. No big changes except for pulley. I got a dual alt pulley and had it drilled/bored out just a tad bit to get it too fit onto the FD alternator shaft. MikeL just did a writeup on his FD alternator swap in his 88. Good writeup.
I'm putting an FD alternator in my 88 this weekend. No big changes except for pulley. I got a dual alt pulley and had it drilled/bored out just a tad bit to get it too fit onto the FD alternator shaft. MikeL just did a writeup on his FD alternator swap in his 88. Good writeup.
09-10-02, 09:56 AM
#24
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Originally posted by silverrotor
You will also need the harness clip aswell.
You will also need the harness clip aswell.
09-10-02, 11:43 AM
#25
Originally posted by Maxthe7man
Put a 2 guage wire between the postive post and the alternator output terminal in parallell with the stock 10 guage wire, and you will notice a huge difference in voltage..Max
Put a 2 guage wire between the postive post and the alternator output terminal in parallell with the stock 10 guage wire, and you will notice a huge difference in voltage..Max
8 gauge should be MORE than enough.......