14point7 iDash – a datalogger update.

I thought I’d share an update on how this went over the season. Overall, an invaluable unit. A great resource which gave us hard data to back up what we were working out via reading plugs and driver feedback.

Initially the default filtering on the EGT channels was set to average across 2 samples, which we changed so there was no averaging as the data didn’t appear to make sense. That gave us a view of the EGTs that appeared to be the real signal along the lower edge of the data, with numerous high spikes running from the trend line.

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So, I could interpret this, but it’s annoying. I was using WinLogView, which is the software which is free from 14point7. Great software to use actually, also giving the “matrix view” which allows seeing the spread of data in a table. Handy.

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I had to set up the axes, TPS voltage vs RPM. It’s useful, and lets me see how the tune is across the ranges. What we can do about it is somewhat limited, using a carburetor.

I then discovered I could read the data in MegalogViewerHD. Checking through the options, it appeared I could do filtering and rules on the data – if I purchased the full version. So I did, and spent some time reading documentation and head scratching on how I would filter the EGT spikes out. I set up some rules where if the rate of change exceeded a certain level, it used the previous value instead. I also did this on the AFR and TPS channels to smooth the data, as the “smoothing” option for viewing the trace averaged the trace and moved the values too far away from the original raw values I could see were good data.

I don’t have a shot of before filtering, but this is tremendously improved from the logged input, especially the EGT trace which was similar looking to the one above.

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I also created a filter to put the TPS voltage into percent, and also one to put the AFR into Lambda. MegalogVewier also has a table function, so I used that too. Same things as the Matrix view on WinLogView.

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So yeah, a bit rich.

Now that I have the rules/filters ser up in MegalogViewer, I think we’ll have far more usable data for the coming race season. Engine and carb changes have been made, so it will be interesting to see the effects of that.

Roll on next race season.

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