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Old 10-24-2015, 09:43 PM   #10 (permalink)
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I've messed about with this kind of alt on UFI and here's what I found:

1. The alternator monitors charge acceptance, not just voltage (voltage can't tell you much frankly). If you fit a LiFe or supercap, you'll change charge acceptance and the alternator will become confused. I often had to stop and reset the system as it would go into safe mode (constant 14.0V). S/S was never going to work as again, charge acceptance was too high as judged by the ECU.

2. Disconnecting the alt is all but pointless. Essentially (assuming you have a serpentine belt), it's already free spinning much of the time so removing it and fitting an idler pulley won't help.

3. Charge the battery every night. You'll get a solid 5% gain as essentially the alt is now off because the battery is full. It will still ramp up on overrun for some free charging.

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