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Practical Reflash Tuning: Step 6: Confirm Calibration On The Road

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Step 6: Confirm Calibration On The Road

02.40

00:00 - With our calibration now complete on the dyno, I'm a big advocate where possible of confirming the tune on the road.
00:08 While the dyno is the best place to perform your tuning.
00:12 It's incredibly difficult to accurately replicate the air flow and conditions that we're likely to see with the car out on the road at speed.
00:22 Since this is where the car is going to spend it's time, I always like to test and confirm that the air fuel ratio matches what I saw on the dyno and that the engine isn't suffering from knock.
00:36 It's not uncommon to find that we may need to make minor adjustments to the air fuel ratio when we test out on the road.
00:44 Or that we may find the engine seems more prone to knock in one or two areas.
00:50 This is where the data logger really becomes valuable and we can scan the ECU while driving to see what's occurring.
00:58 In particular I like to data log the engine performance in three different areas.
01:04 First, I'll scan the engine under normal cruising conditions at both motorway speed and around town.
01:12 Here I'm looking specifically at what the fuel trims are doing as this is a guide to the accuracy of my MAF scaling or my VE table and my injector scaling.
01:23 At the same time I also want to make sure that under these light load conditions no knock's being registered.
01:31 Next I'll look at the wide open throttle performance and specifically I want to look at how the engine responds under high load and sustained high RPM.
01:42 Which is what we could expect under heavy abuse.
01:45 This is essentially the worst abuse the engine's likely to encounter and if everything checks out here we can be confident in our tune.
01:55 Here we're looking at the measured air fuel ratio and knock feedback.
02:01 If the engine's turbo charged we also want to pay close attention to how well the boost is tracking against our target.
02:09 Lastly I will also check the engine performance under transient conditions such as fast throttle applications and gear changes for a manual transmission.
02:20 Here we're looking for smooth response to throttle input, good control of air fuel ratio, no knock and no over boosting in turbo charged cars.