Max Alternator Amperage on the 2.0L

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Old Feb 27, 2014 | 08:11 PM
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Max Alternator Amperage on the 2.0L

Golfsick has a newer generation STi alternator installed in his Ver.8 swap.

The 02-03 has a 75 amp alt and the 05-07 has I think 90 and the new generation has a 110.

Ray seems to have zero issues with his but I am worried about the over amperage possibly interference with the ECU.
Old Feb 27, 2014 | 09:12 PM
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The ecu will only take whats needed to operate, not any extra.
Old Mar 1, 2014 | 07:11 PM
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Originally Posted by Heedz
Golfsick has a newer generation STi alternator installed in his Ver.8 swap.

The 02-03 has a 75 amp alt and the 05-07 has I think 90 and the new generation has a 110.

Ray seems to have zero issues with his but I am worried about the over amperage possibly interference with the ECU.
I'm using the 90 amp STi/9-2x one with no issues.

Bolts right in.

Some Subaru's have different alternator plugs though. Not sure which ones are different from the others.
Old Mar 1, 2014 | 07:44 PM
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Originally Posted by joltdudeuc
I'm using the 90 amp STi/9-2x one with no issues. Bolts right in. Some Subaru's have different alternator plugs though. Not sure which ones are different from the others.
which year one is it?
Old Mar 4, 2014 | 05:33 AM
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Originally Posted by Heedz
which year one is it?
NSA ALT-3034 for a 2005 Saab 9-2x Linear (Non-Turbo)

NSA ALT-3034 New Alternator for select Saab models : Amazon.com : Automotive NSA ALT-3034 New Alternator for select Saab models : Amazon.com : Automotive

Last edited by joltdudeuc; Mar 4, 2014 at 05:40 AM.
Old Mar 4, 2014 | 07:58 AM
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Originally Posted by Overbear
Why not just get the stock Alternator rewraped and swap out the diode so it puts out much more? I did that for my 4runner and now have 120amp AC/DC wired (single wire ford style) so I can use it for welding too. Cost me under $300 total for the work including installing it.

Ive been pondering doing a DC only rewrap on the FXT's alt, to bump it up to 120-140amp, what i would really like to do is go 24v but that would require so much work (and space for 4 6v batteries, too much weight)
I've been looking at higher output options as my alternator has 175K on it and could certainly stand to be replaced. My research has lead me to an '05 STi alternator as it bolts right in to the 2.5 NA ('00 RS) and is 90 amp vs. the 75 amp stocker. As much as I might like to have a 120 amp alternator, I don't particularly have the need. 90 amp should be more than enough for me and it's only ~$125 (@ O'Reilly).

-Brian
Old Mar 4, 2014 | 08:06 AM
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Why not just get the stock Alternator rewraped and swap out the diode so it puts out much more? I did that for my 4runner and now have 120amp AC/DC wired (single wire ford style) so I can use it for welding too. Cost me under $300 total for the work including installing it.

Ive been pondering doing a DC only rewrap on the FXT's alt, to bump it up to 120-140amp, what i would really like to do is go 24v but that would require so much work (and space for 4 6v batteries, too much weight)
Old Mar 5, 2014 | 10:09 AM
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Originally Posted by Overbear
Why not just get the stock Alternator rewraped and swap out the diode so it puts out much more? I did that for my 4runner and now have 120amp AC/DC wired (single wire ford style) so I can use it for welding too. Cost me under $300 total for the work including installing it. Ive been pondering doing a DC only rewrap on the FXT's alt, to bump it up to 120-140amp, what i would really like to do is go 24v but that would require so much work (and space for 4 6v batteries, too much weight)
You have cheaper options with less work into it than $300. Not only that. Having it done right and not frying the rest of the system. Plus I dunno how much longer this alternator is good for.
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