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RX-7 2nd Gen Specific (1986-92) RX-7 1986-92 Discussion including performance modifications and technical support sections.

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Old 08-01-2014, 01:12 PM   #1
Pete_89T2
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FWIW, I ended up picking up that 110A alternator from AceAlternators on ebay. I have no means of measuring current draw to verify the 110A upgrade, but here's the voltages I'm seeing with it:

@ 750 RPM idle, low beams on + fog lights on + A/C fan on max = 12.6V. Nudge the idle up to 850 RPMs or higher, and it goes up to ~13.6V.

With same loads switched off, from low idle and up nets between 13.6~14.5V.

Also I have an alternator installation tip that might be useful if anyone runs into the problem I had. This particular alternator didn't want to slip over the water pump housing at the pivot point - it was maybe a few thousands of an inch too tight, and there was no persuading it to fit. After much cursing, and considering shipping it back, I had a brilliant idea... Just loosen the 4 bolts that hold the alternator halves together about a 1/4~1/2 turn each; that "spreads" the alternator half's just enough to get it to slip over the water pump housing pivot point. Once the pivot bolt was in, I just tightened the 4 alternator bolts back down and everything was fine.
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Old 08-01-2014, 02:32 PM   #2
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Quote:
Originally Posted by Pete_89T2 View Post
FWIW, I ended up picking up that 110A alternator from AceAlternators on ebay. I have no means of measuring current draw to verify the 110A upgrade, but here's the voltages I'm seeing with it:
I picked up a Mastech MS2108A as a cheapie option for now.
You can get them for under $50 shipped - check eBay and Amazon.
Until I can scrape up the skrillah to get a Fluke for several hundred $, the Mastech is "close enough" - who cares if it's off by 20%?


Quote:
@ 750 RPM idle, low beams on + fog lights on + A/C fan on max = 12.6V. Nudge the idle up to 850 RPMs or higher, and it goes up to ~13.6V.

With same loads switched off, from low idle and up nets between 13.6~14.5V.
It sounds like you got a better unit than I did.
I've never seen mines go over 13.9VDC, and it's an FD unit rated to 150A... :P


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