Hondata

Well, just like the topic says.. I'm wondering if the ecu compensates for different IAT temps and adds more fuel when it's cooler. Just wondering if it's necessary to retune in the winter/summer, etc.. I'm referring to when the ecu goes into open loop, I know it adjusts for closed loop. Thanks.

-Mike

yes I believe so it does compensate for the temperature.

QUICKSILVER RACING wrote:yes I believe so it does compensate for the temperature.

Ok, so does anyone know for sure..?? I didn't ask for a guess..

-Mike

I'm not guessing. I am recalling it from memory. It was a topic that was once discussed.

If you really want to be sure, I suggest that you buy a wideband O2 sensor and datalogger and start using it. winter is coming and you can check if your car is leaning out.

Don't buy those cheapo A/F meters. Buy the real ones like MOTEC or FJO.

You can never be too sure if you don't do it yourself.

The ECU compensates for temperature. The only things that the ECU does not compensate for is fuel temperature and humidity.

SlowTeg wrote:

QUICKSILVER RACING wrote:yes I believe so it does compensate for the temperature.

Ok, so does anyone know for sure..?? I didn't ask for a guess..

-Mike

The authority in Honda ECUs has spoken. Now you can sleep better at night.

Hondata wrote:The ECU compensates for temperature. The only things that the ECU does not compensate for is fuel temperature and humidity.

I've asked this before, but never got a response...can you explain *how* the ECU compensates for temperature? Does it just adjust fuel, or does it adjust timing as well?

I'm particularly interested in how the ECU behaves at extremely high IAT readings (150+ deg. F).

-Andy