Road Tuning: Using Data Logging
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Using Data Logging
02.10
| 00:00 | - Driving a car on the road or track as well as making tuning changes requires a lot of skill and can reduce 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 analyze what's happening and what changes you need to make. |
| 00:36 | This is particularly important when you're doing full-power tuning. |
| 00:40 | 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 the file. |
| 00:50 | This makes it really fast and easy to make accurate tuning changes based on the log file. |
| 00:57 | Some ECUs will also allow you to produce a mixture map from a log file. |
| 01:01 | This is essentially a histogram which shows the actual logged air/fuel ratios in relation to engine rpm and load. |
| 01:10 | Comparing the log mixture map to your target air/fuel ratio is a really fast way to optimize the fuel table. |
| 01:17 | Just be aware that acceleration enrichment may affect these readings as will hitting any ignition cut such as an rpm limit, boost limit, or gear change ignition cut. |
| 01:27 | When creating a mixture map, try to drive the car as smoothly as possible and stay away from limiters. |
| 01:34 | For simplicity you want to make sure you're logging or viewing only the parameters that are most relevant so you don't get confused or sidetracked on aspects that aren't important. |
| 01:44 | I would start with engine rpm, throttle position, manifold pressure, air/fuel ratio, ignition timing, and injector duty cycle. |
| 01:53 | These parameters should be enough for you to optimize the tune. |
| 01:58 | This completes the full power tuning section of the course and by now you should have a good understanding of how to tune the wide open throttle areas of your map. |
