EOC ~ only useful at low speeds

[ennored]

Originally Posted by PaleMelanesian

It could be that your engine management runs rich for a while after a restart or something like that, making the shorter eoc cycle at highway speed less beneficial.

DING DING DING DING! We have a winner!

When you power back up, the ECU is programmed to wait for the O2 sensors to warm up. Newer cars have some logic to know how hot they are, but older ones just had fixed timers. 20 or 30 seconds of open loop could kill any savings you got shutting off the engine.

[j12piprius]

I removed the pgm-f1 kill switch yesterday, hooked it up to the main injector wire today, and it works! I've not gone for a test drive yet, but turned the switch off and on 10 times, with 3 second delays, and there was a negligible change in the voltage. Success!

Hopefully this will raise the break even point enough, that EoffC can be useful on trips. However, I think the aerodynamics will have to improve quite a bit, for that to happen.

[oldtamiyaphile]

Originally Posted by ennored

When you power back up, the ECU is programmed to wait for the O2 sensors to warm up. Newer cars have some logic to know how hot they are, but older ones just had fixed timers. 20 or 30 seconds of open loop could kill any savings you got shutting off the engine.

Does an injector kill switch get around this? Even my 2014 car still goes open loop for about 5 seconds after key off.

[j12piprius]

My 2.7 mile route (backing out of garage to street, 7 stops, back into garage) with the
pgm-f1 kill switch was 63.3 mpg cold. This morning with the new injector wire kill switch
I got 77.1 mpg cold. Eliminating the .05v drain appears to make a difference on short trips.