Quote:
Originally Posted by m5james
Logs link is on post #50
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So I took a look at some of your logs.. Just a couple of observations;
1) its hard to really see whats happening in your engine the tool your using has a very low sampling rate, you get 1 data point about every 1.25-4 seconds. With this resolution it will be hard to catch a lot of transient behavior like timing changes, boost oscillation, etc. ideally you'd like a sample rate of 5-6hz or 5-6 times a second to catch transient behavior. Might try logging less parameters to see if you can increase your sampling rate.
2) most of your pulls are in a narrow rpm range. I would suggest getting a few more full range pulls starting in 4th gear and running to redline if possible to get a lot of good sampling. Most pulls are starting in the 4000rpm range and terminating around 5500rpm. I know this is hard to accomplish on public roads. But it would shed light on the health of the engine at all rpm's not just the narrow range.
3) I notice a lot of boost fluctuation in the car. What I mean is that boost will rise as rpm rises, then drop as you approach redline, then increase again. This isn't normal, boost should not rise past the point of peak turbo flow. May indicate a problem with boost control system, valve springs, leaks, etc. but its hard to say without logging of mass air flow. The car may also be pulling boost as a safety measure if there are a lot of misfires going on. Might help to measure timing per cylinder.
4) I also notice a lot of throttle plate fluctuation too on your car. You have the peddle floored, I see at 2800-3000rpm the car hits 100% throttle, snaps the throttle closed to 38% at 3900 rpm, even though you've not lifted the throttle, but dosen't pull timing, wonder whats going on there something not being captured in the log? A car / Tune safety measure to limit torque at mid rpm ranges?
example from 2017-03-14 01_23_18
timestamp rpm boost pedal throttle avg_ign
19 2442 0.2 100 77 0
20.5 2399 1.2 100 81 0.9
22.25 2555 3.1 100 90 2.5
24.25 2671 5.1 100 95 4.3
24.75 2730 6.9 100 97 5.8
27.75 2828 8.2 100 100 7.3
29.75 2885 9.4 100 100 8.6
31 3082 10.2 100 100 10
33 3134 11.4 100 100 11.1
34.75 3325 12.6 100 75 12.2
36.5 3419 14 100 72 13.5
38.5 3537 15.2 100 51 14.4
40.25 3728 15.2 100 40 14.4
41.75 3933 16.3 100 38 15.3