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Here's the breakdown of the three buttons on the shift knob and their function in case you guys are interested in putting one on yours:
The center button is a pop-up on/off clutch interrupt switch for manually controlling the assist and regen functions. When I click it in, the car thinks the clutch pedal has been pressed, so I get no assist or regen. When I'm at cruising speed in lean burn and don't want any background IMA charging, or when I know I will need to come to a stop and want to kill the injectors I click this button on. This doesn't affect auto-start in any way.
Thumb button on left is a momentary switch and controls the power to the Injectors. I can kill the injectors and coast to a stop at any speed, basically extending auto-stop function to any speed. To use the injector kill button, I have the center clutch interrupt button clicked on, or the car will keep trying to re-start since it's above normal auto-stop speed.
The button at top right is the brake regen button, and is a momentary that allows me to use the assist motor for braking (and also turns on the brake lights), which allows me to keep the IMA battery fully charged since I don't let it background charge while in lean burn. I can keep my finger on it all the way through downshifts, and it keeps charging the IMA almost to a dead stop.
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