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I think the gains would be minimal. I think the biggest benefit exists in the minds of people who don't understand electronics. They think that since it's electric and not running off the crank, it won't sap power from the crank. But that's not true. The more stuff you run off your alternator, the greater the current draw will be. And the greater the current draw, the harder it will be to turn the alternator. And the power transfer from crank>alternator>motor>accessory will be less efficient than directly turning the accessory from the crank, so it'll sap more power. Usually this setup is used when a conventional way wouldn't be feasible, such as using an electric fan on a FWD car, whose engine is mounted transversely and can't use a pulley driven fan, or an electric power steering pump on an MR2, since the engine is in the back and needs a pump up front where the steering rack is. Can you think of another car that uses an electric pump for any other reason? If someone can show me dyno proven results that say otherwise I'd be glad to change my stance.
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