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Link G4 Plus Software Tutorial: Using the Quick Tune Function

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Using the Quick Tune Function

03.45

00:00 - The quick tune function allows the fuel table to be automatically tuned to match the numbers in the AFR/lambda target table.
00:08 This requires a wideband sensor to be installed and configured on an analog input channel.
00:13 Quick tune can be activated by pressing F10 or by selecting it from the tuning menu here.
00:19 This will open a new window which displays the measured AFR and the target AFR at any point in the fuel map.
00:26 Depending on the units selected, quick tune will display in either AFR or lambda.
00:32 Before we use the quick tune function, we need to configure the system by clicking on the show settings here.
00:38 This opens a window which shows all of the quick tune settings.
00:43 We can select which fuel table the quick tune adjustments will be applied to.
00:47 In this case we only have one fuel table so this is our only option.
00:52 If you have two wideband sensors installed you can select which sensor to use or use the average value of the two.
00:59 Tune ahead will copy the tune cell to other cells which can speed up your tuning.
01:05 You can select where you want the tuned cell to be copied to if you use this function.
01:10 Tune ahead trim will increase the value of the copied cells by this percentage.
01:15 This is designed to help prevent the engine going lean as you increase load and RPM.
01:20 The filter setting applies a filter to the wideband input which is useful if the wideband value is unstable.
01:26 A higher number applies more filtering while a value of one will disable filtering.
01:31 Precision defines how close the measured air/fuel ratio needs to be to be considered tuned.
01:36 If this is set to 0.1, then the allowable tolerance will be 0.1 +/- the target AFR.
01:44 For example, if we're targeting 14.7 the tolerance would be 14.6 to 14.8.
01:52 Time in cell centre defines how long the ECU must be in the centre of a cell before the quick tune operation can occur.
01:59 This eliminates the chance of transient enrichments affecting accuracy.
02:03 Max auto attempts is the number of attempt that the ECU will make at tuning a specific cell.
02:10 This will usually take two to three attempts.
02:13 To make sure we are accurately tuning the correct cell, quick tune includes a load and RPM centre tolerance.
02:20 This is how close to the centre of a cell we need to be for the auto tune to function.
02:26 Next we have lockouts for maximum and minimum RPM and load.
02:30 This lets us control the region of the map we want the auto tune to work across.
02:35 We also have an ECT lockout which prevents the quick tune from functioning while the engine is warming up.
02:42 Lastly we can set the range of the gauge display for better resolution.
02:46 Once we have adjusted the settings we can close the settings again.
02:52 We can use the quick tune in two different ways.
02:55 By clicking manual mode, we can drive the car into each cell and click tune cell or press F10 each tie we want to tune a cell.
03:04 To the left, the ECU will tell us if we are in the centre of a cell and ready to tune and it will also tell us when the target is reached.
03:12 If there is still a discrepancy between the target AFR and our measured AFR in a particular cell, the F11 key can be used to restart the tuning process.
03:23 Auto mode works the same way but the ECU will begin tuning every time you're in the centre of a cell.
03:29 This lets you simply move around the fuel map and the ECU will make the necessary adjustments.