Hey, I was looking for a little background info on how the scanner works in order to help me get the most out of it.
Car is a 2017 Audi S3, which currently only supports mode $22 scanning, in addition to the normal SAE stuff of course. I am also logging from both the ECM and TCM.
First I exported a CSV with interpolation disabled so I could see exactly when each parameter was updated. I put this in a spreadsheet vs selected interval rate in the software.
When I broke these out by SAE PIDs vs ECM $22 vs TCM $22 I started to see a pattern as to the ones that were hitting target logging rate vs slowing down quite a bit.
I'll say up front, yes I am logging more stuff than I need to right now. Been logging extra things to see what exactly everything is, what might be useful etc. I know by simply logging less stuff the rate will go up.
Ultimately, the ECM $22 stuff is mostly what I need, and the 10hz ones are bogging down pretty good, only hitting around 3.5hz on average.
Is my best course of action to simply remove all the stuff I don't need and/or reduce less important things down to say 5 or 1hz?
Will I see a speed boost in general if I don't log ANYTHING from the TCM? With bluetooth logging with Torque Pro or similar on a phone, by simply logging a combination of Mode $01 and Mode $22 or ECM and TCM I saw a big hit in overall performance. Increase in "overhead from changing modules/modes" as it was described to me.
Would I see a performance boost if I tend to use more SAE pids and "even out" the Mode $01 vs Mode $22 ? For example, only use SAE ign timing, and SAE engine RPM (even though SAE is 2 bytes and Mode $22 is 1 byte), etc.
Not complaining about anything, I understand this car still lacks a true high speed logger at the moment with no Mode $2C stuff-- I am simply just trying to make the most of what I have in front of me.
In this log, I am getting an overall logging rate of about 150 PID/s.... I am just a little confused as to the under the hood operation. Why are SAE and TCM 10hz commanded items achieving target, at the expense of the Mode 22 stuff? Before digging deep into this data, I might have expected to the 10hz params to all be hitting around 5-6hz.... not some are chugging along at 10hz and others suffering even more at their expense.
Thanks