Hi all. Been a while since I tuned my car and is in the middel of doing a complete remap. Getting back to the second o2 sensor: I have no CATs, so no worries there. What does the second o2 sensor do and what does the first one do? I know they measure the exhaust stream to calculate the afr's, but wh...

Thanx. Is there no way of disabling the second o2 sensor without having to disconnect it? I am not too worried about my Cat, because I have none. What bothers me is that why will the ecu try and achieve 1 lambda when in the flashed values it should target 1.021 (according to my map)? what other maps...

All my tables are 100% the same. closed loop as well as partial throttle. I do realize that 1.021 isn't the biggest change, but I would like to take it up in small steps.
I first want to get my car to follow what I tell him to before going more lean.

Should it be?

No I do not have the sensor disabled

Update on the tune.

When the tune was still fresh, the car was commanding 1.021, but as soon as everything settled, commanded AFR went back to 1

good news.

Did the 'fix' and went to town quickly. commanding 1.020. map still has to settle and will be doing a highway log again on my way home.

Any body here running leaner than 1.020?

Thanx.

Will try that and give some feedback.

My question though, why do you need to change the lower values to stock? I thought that the ecu will try and reach whatever you put in the tables?

Hi

I am not sure what you will see with the whole thing, but I have attached my entire commute in one log.

This happens all the time as far as I know. My drive home is about 30min, of witch 15min is city driving and 15min on the highway. I can post a log of the entire trip if you like. from cold start till I switch off at home. The logs I attached were not after a detonation event, but if that is the cas...