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Discussion Starter #1
Anyone know if there is a product out there that can kill the power except for the ECU?

I can certainly design one, but I was wondering if there was one I could just buy.

I know there are devices you can plug into the ECU to do this, but I'm looking for a more elegant solution.

The problem I'm trying to solve is that with a traditional cut-off switch, all power is killed and the ECU's settings are reset. The car then has to be driven for 50-100 miles to optimizes fuel maps and possibly other settings.

On my RX8, my car had a tendency to stall whenever I changed batteries but after a week or so of driving, all would be well.

Thanks for any advice in advance.
 

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Anyone know if there is a product out there that can kill the power except for the ECU?

I can certainly design one, but I was wondering if there was one I could just buy.

I know there are devices you can plug into the ECU to do this, but I'm looking for a more elegant solution.

The problem I'm trying to solve is that with a traditional cut-off switch, all power is killed and the ECU's settings are reset. The car then has to be driven for 50-100 miles to optimizes fuel maps and possibly other settings.

On my RX8, my car had a tendency to stall whenever I changed batteries but after a week or so of driving, all would be well.

Thanks for any advice in advance.
I can't answer your question, but I use a battery isolation switch and have no drive ability problems.
Michael
 

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You may want to look into the 2zz-ge engine ecu facts to confirm it actually clears the "learning" with removal of power to it... i've not read anybody saying that's the case, nor have i ever read about a disconnected battery causing any driveability issues... if anything people will suggest it to solve an issue...
 

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SirLotus would know better than I, but a little time with a wiring diagram would answer this.

Seems you would just need a terminal before the cutoff switch.

From that terminal you would run a wire to the hot side of the ECU, fused of course.

Could be as easy as a wire running to the bolt on the battery terminal that runs to a fuse and then to the hot wire on the ecu. Then you run a classical battery cut off switch, (example, not a recommendation BATTERY CUTOFF SWITCH CAR RV BOAT RACECAR ATV CUT OFF : Amazon.com : Automotive), to the positive cable which would kill the rest of the car.

Down side
1) I dont know if the ECU does learn and/or forgets if you kill the power.
2) Your radio would get stupid each time it looses power
3) The alarm need to not be set, (verify with Michael), or the "Somebody just cut the power" feature in the alarm would activate. (doesnt the alarm have a reserve power supply in it?)
4) Seems like for a street car, a battery tender would be easier to install and would keep the battery topped off to boot!
 

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Discussion Starter #5
I think I'm just going to see if I can relocate a kill switch to somewhere accessible. Stupid Evora design prohibits trunk access without power. The emergency latch under the rear passenger-side seat wasn't designed for repeated use.
 
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