According to my conversation with Keihin, the sensors are on 100% of the time, but the ECU cannot process realtime data once the throttle has been opened.
The thottle must be closed for 30+ seconds for the data to be processed.
I find that very hard to believe, that the data prcessing capability would be throttle pos dependend as described.
I could imagine that it is rpm dependend, meaning at 2000 rpms and below there is enough time to sample and process,
whereas at 10.000rpms the time between injections might be too short.
Personally that is still hard to believe, as I know from personal ECU programming that for instance an ST7 microcontroller
requires a "request to sample" an input voltage and it will alert the program by interrupt when the measurement is complete,
enabling the CPU to do other stuff till the ADC has finished converting the sensores voltage to a number.
And it is especially hard to believe, because that would mean, that one would be required to stop and recalibrate the ECU
after the engines warmed up, because if the ECU truly won't be able to sample temps and pressures in real time
it won't notice when the engine has reached operating temps and continue onwards with rich, cold start mixture.
So as CDI's since the dumb WR400F's always did sample TPS in real time,
and the 10 years younger, prgrammable EFI ECU do sample TPS, intake pressure (a very dynamic input value) and
- if configured - do european closed loop O2 regulation in real time,
I refuse to accept that somehow they can't sample the very slowly changing air/water temps, that just makes no sense.
That either is an urban legend, like the one stating that one must not be on CO adjustment mode
with the engine running (which I debunked here personally)
or it is only correct for some different / simpler ECU, that Keihin guy was referring to.
Otherwise, the processor would have include O2 post combustion chamber to be able to make adjustments in real time.
No idea what that should mean.
Edited by WRF-Rowdy, September 15, 2015 - 07:23 AM.