alternator upgrade
#1
mmm doritos
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alternator upgrade
im looking to upgrade my S4 alt due to some mods...i need something big! im debating on using the FD alt or a big GM one wire alt,what do you guys reccomend? ive heard alot about the FD alt but not much on the GM one wire
#3
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FD alt you will need to run one new wire from the battery and try to get a pulley and spacer machined to fit on the FD shaft. You can usually find these on ebay. I think 2 members sell them too.
I would keep the 3 wire system so you will know when the alternator fails.
I would keep the 3 wire system so you will know when the alternator fails.
#5
Originally Posted by RotaMan99
FD alt you will need to run one new wire from the battery and try to get a pulley and spacer machined to fit on the FD shaft. You can usually find these on ebay. I think 2 members sell them too.
I would keep the 3 wire system so you will know when the alternator fails.
I would keep the 3 wire system so you will know when the alternator fails.
i am looking to fit an E fan so was going to fit an FD alt, why do i need to replace the wire to the battery?, is it too small?
I have put my battery in the boot and used a junction box in the engine bay, the wire going to the battery from the engine bay to the battery is 0 gauge so thats definately big enough, should i just replace the wire from the feed peg on the alternator to the junction box.?
What size do people recomend?
#6
Rotaries confuse me
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You don't need to replace the battery. I think you misread.
This may also help. https://www.rx7club.com/2nd-generation-specific-1986-1992-17/fd-alt-question-605711/
This may also help. https://www.rx7club.com/2nd-generation-specific-1986-1992-17/fd-alt-question-605711/
#7
Originally Posted by My5ABaby
You don't need to replace the battery. I think you misread.
This may also help. https://www.rx7club.com/showthread.php?t=605711
This may also help. https://www.rx7club.com/showthread.php?t=605711
who said the battery needs replacing?, someone mentioned a new wire, is this an additional wire or replacing an old one.
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#8
mmm doritos
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^ stop hijacking my thread.... I have quite a few mods that i know will be way to much for the stock S4 alt. i have a black magic E-fan that pulls 3300 CFM and also crazy amounts of juice, aftermarket stereo system,custom upgraded headlights and meth injection pump..
#10
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Originally Posted by My5ABaby
What "mods"? Depending, just use the FD alt. I'm not sure about the GM one, but the FD is pretty much just a drop in.
#15
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Originally Posted by Soma
Take your stock alt to an electrical shop and have it rewound!
They can easily bump up the amperage!
They can easily bump up the amperage!
#18
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Originally Posted by Soma
If I remember right, the shop I went to said they would do it for a little over $100. I remember it being close to the cost of a new stock alt.
#19
Rotaries confuse me
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Originally Posted by micaheli
I think there's more to it than just dropping it in.. you need to find a pulley that fits.. and you need either an S5 or FD harness plug to retro onto the S4.. but I suppose you said 'pretty much'.
#21
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Which pulley to get is the hard part.... gotta raid the junk-yard. There's a good alternator write-up on nopistons: http://www.nopistons.com/forums/inde...howtopic=41986
Pretty good info.... and I don't think the thread is done yet.
Pretty good info.... and I don't think the thread is done yet.
#22
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why do i need to replace the wire to the battery
#23
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as far as fitment goes, anyone have an experience with the FD alt mod in conjunction with a strut tower bar? is there sufficient room for this upgrade to the larger alternator? or am i assuming it bigger than it really is?
#24
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I think this depends on the strut brace its self. I had one off of ebay a few years back and the alt would touch the bar. This was slightly fixed with shorter belts. If you can find a strut bar the goes in front of the alt, you are better off, mind went above it. I don't have it anymore.
#25
Turbo Waggin
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I think this depends on the strut brace its self. I had one off of ebay a few years back and the alt would touch the bar. This was slightly fixed with shorter belts. If you can find a strut bar the goes in front of the alt, you are better off, mind went above it. I don't have it anymore.
Also, has anyone done this using a serpantine belt instead of the double skinnys?