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Old 10-12-2009, 07:30 AM   #5 (permalink)
Piwoslaw
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Join Date: Oct 2008
Location: Warsaw, Poland
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Svietlana II - '13 Peugeot 308SW e-HDI 6sp
90 day: 58.1 mpg (US)
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Quote:
Originally Posted by Frank Lee View Post
Frank gave that link with relation to BMW's electric water pump, but I also noticed that BMW is going semi-alternatorless, i.e. using the alt only when braking. I'm wondering whether that is enough? Imagine cruising for hours, stereo blasting, it's hot plus A/C = high engine temps, so (electric!) water pump is spinning fast. Plus the engine is an I6 or V10, so the ignition is also wanting... All of that is using up a lot of juice, and you're not braking to replenish it. Even the beefed up battery will be weak after a few hours. Maybe there is an emergency mode that turns the alt on when the battery starts feeling bad? I doubt Beemers would have to be plugged in for the night.
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e·co·mod·ding: the art of turning vehicles into what they should be

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