I'm going to try going thru a local auto electric shop to modify an extra S5 alternator for more output. I'm trying to figure out what kind of amps I should be shooting for.

I have 3 amps I'm going to be using for the stereo that total about 670 watts total.
I'm going to be adding a taurus e-fan with a fan control. I believe they pull 30 or so amps at turn on and then settle down to around 8 amps during operation.

I'm going to be adding a wideband O2 system, probably an Innovate LC-1 to start, maybe add an XD-16 and other accesories down the road. Is a wideband system putting enough strain on the electrical system to take that into account? I doubt it is pulling many amps, but thought I'd check.

I know I can simply get a 3rd Gen alternator, but I've got this extra alternator and feel like tinkering around with it.

 

you think modifiying an alternator is for free?
it is cheaper to sell the spare you have , then get a FD alt and be done for...

 

+1

Gg

 

Did he say it was free? I don't see a mention of it.

Hey Jeff, I believe the stock S5 alt is 80A. I've been told that they can be re-wound for 100A or 125A, though I'm not sure if this is something you can do yourself. I know that you can buy brush kits for rebuilding the alternator, but I'm not sure if non-professionals can get the tools to re-wind the coils for higher output (which also sounds like something you don't want to make a mistake with).

You might want to see how much it would cost to have the alternator done for you. I'm just venturing a guess here, but I think it might cost around $80 for a 100A re-wind.

 

You mean it's not free???? I said at the bottom of the post that I know I can get a 3rd gen, but i WANT to tinker around with the one i have.

 

I've found a few sites that sell alternator parts for ac/delco, nippon/denso and a few other brands of alternators, but not much on the Mitsu alternator. I've found books for pretty cheap on rebuilding and modifying. Found a site that walks you thru 3 phase rewinding. I'm just trying to gather knowledge and find out how much it would cost me for the parts. I did a search of these forums and didn't find much, but did find a local auto electric store that will work with me on modifying my spare. I'm just hoping to talk with someone who's tried this.

It's really just something to do for fun and my own learning and would probably be smarter and cheaper to pay someone to do the work or get a 3rd gen alternator.

 

I understand about wanting to do it yourself. While I don't have any personal knowledge on re-winding and rebuilding an alternator, I bet you could probably get the parts for <$50.

 

You'll be limited to about 120ish amps since you can only fit so much winding the case.

If you're modifying it for max output, don't shoot for an amperage goal, just tell them to fit as many windings in as they can.

 

a good alternator rebuilder can do it, i have had my old S4 alternators redone to 100 amps.

 

I found this website on rewinding stators

http://www.mtmscientific.com/rewind.html

I'd like to learn more and do the winding myself, but we'll see what comes of all this.