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Originally Posted by mpg_numbers_guy
Couldn't you install a switch to disable the hybrid system to prevent forced regen while driving, and enable it for when you wanted to autostop?
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All of the car's computers need to reboot, and then you need to clear the CEL. It wouldn't be a simple switch, but rather a process that takes several minutes and is multi-step. Anyhow, once the battery is that bad, the regen is necessary to have the energy for auto-stop. We're talking the final weeks of a battery's life before it does nothing, not months or years.
Quote:
Originally Posted by mpg_numbers_guy
Does lean burn reduce HP output? I was thinking in regards to climbing a hill, because if downshifting to 4th or even 3rd but maintaining speed and lean burn would be more efficient than lugging it up in 5th and having to re-accelerate at the top of the hill.
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Yeah, if you lean out by 33% (14:1 to 21:1), you also lose 33% of your power. You're burning 33% less fuel, after all. It's not free fuel saved. It's only useful if you are only running part throttle in a given gear, leaning out let's you run a wider throttle opening and save a small amount by making less vacuum. It might also affect BSFC, but measuring that would be very difficult.
Lean burn would be nearly pointless on a Prius, for instance, because it has effectively infinite gearing. You just slow the engine down more, or toggle it on and off.
There are a few other subtleties where it's useful, like allowing an engine to actually run at a higher rpm at WOT and make the same power - sometimes this is useful, but it's not really low hanging fruit.
Quote:
Originally Posted by mpg_numbers_guy
Are you talking about the guy from IC who runs 120 PSI in his tires?
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Yep, he had no lean burn for a long time.