VersaTune User Forum

ShakesReaper wrote: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.

Just export your log into CSV, zip it and post it somewhere here. It may be useful to look at the whole thing.

ShakesReaper wrote: The logs I attached were not after a detonation event, but if that is the case, how long will the ecu remain in the KR Present AFR tables before reverting back to the normal AFR tables?

A few hundreds maybe tens of a second, there's a setting for that in the tune which is given in CPU ticks but to be honest I don't know what's the CPU frequency of our ECU.

Hi

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

Ok, Try changing the target AFRs back to stock on the 500rpm column and on the 0.125 load line. Then for the next column (1000rpm) do a linear interpolation between the 500rpm line and the 1500rpm line.
Same for the 0.1875load line, do a vertical interpolation between the 0.125 and 0.25 load lines. The idea is to smooth that out AND to leave to stock the load/rpm lines where the secondary O2 sensor will have a word to say about the commanded AFRs.

...And to answer your questions, there were a few cells where the commanded AFR was above 1, even 1.021. But in the whole log I don't think there were more than 20.

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?

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?

This is what I was running but I went back to stoich 250kms later because I didn't like how the car was feeling when I was accelerating slowly and the load/RPM was in that area with lean commanded AFRs.

I never tried to go from 1.037 back to like 1.02 or something because I didn't see the point. Also, after 250kms the fuel economy figures where about the same as before on the same segment of road. But that's also part of the fact because here in Romania we have mostly roads where we need to do a lot of overtaking, slowing down + accelerating, and things like that, so not too much highway or express roads. Maybe in highway cruising mode you can pull some better MPG figures if you can keep the RPM and load within those intervals.

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

The tune options has the secondary O2 disabled?

No I do not have the sensor disabled

Should it be?