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Practical Standalone Tuning: Using Datalogging

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Using Datalogging

02.02

00:00 - Driving a car on the road or track as well as making tuning adjustments requires a lot of skill and can affect your concentration and focus on actually driving the car.
00:10 It's also difficult to accurately pinpoint a specific area in the map where your mixture wasn't quite perfect.
00:16 For this reason, data logging is an essential element of confirming your tune.
00:21 I recommend using data logging during your road or track test sessions so that you can review the data later when you're stationary on the side of the road or back in the pits and have time to properly analyse what's happening and what changes you need to make.
00:34 This is particularly important when you're doing full load tuning.
00:38 Many ECUs will also allow you to click on a point in the log file and the ECU will show you exactly which part of the map it was accessing at that point in time.
00:48 This makes it really fast and easy to make accurate tuning changes based on the log file.
00:53 Some ECUs will also allow you to produce a mixture map from a log file.
00:58 This is essentially a histogram which shows the actual logged air fuel ratios in relation to engine RPM and load.
01:06 Comparing the log mixture map to your target air fuel ratio is a really fast way to optimise the fuel table.
01:12 Just be aware that acceleration enrichment may affect the logs as will hitting any ignition cut or RPM or boost limiter.
01:20 When creating a mixture map, try to drive the car as smoothly as possible, and stay away from any limiters.
01:26 For simplicity, you want to make sure that you're only logging and viewing the parameters that are most relevant so you don't get confused or sidetracked on aspects that aren't important.
01:37 I would start with engine RPM, throttle position, manifold pressure, air fuel ratio, ignition timing, and injector duty cycle.
01:46 These parameters are enough to optimise your tune.