When calibrating the MAF for the AP...

[AutoEuphoria]

Quick question...

Obviously if you plan to do any tuning with the AccessPort the first step should be to calibrate the MAF tables. Doing this requires you to log some basic parameters then change some values in the ATR tables. There are other writeups and explanations for doing that part...I have a more basic process question.

I've attempted to do this a few times now, but have always run into the same issue. The ATR help file says to do a datalog in second gear, starting off at 1500 and gradually accelerating over the next 20 seconds until the MAF sensor reads >100 g/s. My issue is that if I accelerate slowly enough to take 20 seconds from 1500rpm to redline I will never exceed 100 g/s because it won't get into boost. If I get into boost to get the 100 g/s target the log is generally not long enough to have a good number of datapoints within each MAF reading breakpoint group.

So, what is the solution to this issue? What are the tricks/techniques that you found to work to give a nice steady acceleration (RPM vs Time) curve as well as a few datapoints in each MAF breakpoint group?

 

[Mi-TMS3]

(uhm)how about driving up a long and somewhat steep hill?

 

[SallySpeed3]

This might not be the most ideal way, but its gotten me some good results. All of my LTFT's while doing any acceleration are 1, 0, or -1. I did the method cobb describes, which yes, is kind of difficult to do. Just start off in low rpm's and take your time applying pressure. When I would get to around 4500 rpm's I would give enough gas to get boost which would then put me over the 100g mark. I then would do another log of normal driving (on and off boost) using 2nd and 3rd gear and let it run for about a minute. I then used the data gathered from both logs to do my calibration. It's more time consuming, but it worked for me.