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Other Correction trims and adjustments The section below describes other trims and adjustments that are not tables.

Fuel Trim Percentage This parameter applies an increase or decrease percentage on the entire fuel delivery table. This is useful when you need to change the fuel table and still leave the engine-breathing curve unchanged. When you are happy with the performance you can leave the trim value or apply the trim percentage directly to the fuel map by pressing the Re-Adjust Map button beside the Fuel Trim selector. This will adjust the map by the trim percentage and then zero the fuel trim value.

Ignition Trim Percentage This feature behaves in the same way as the fuel trim parameter but on the ignition map.

It applies an increase or decrease percentage on the entire ignition table. It is useful when you need to change the ignition table and still leave the timing curve unchanged. When you are happy with the performance you can leave the trim value or apply the trim percentage directly to the ignition table by pressing the Re-Adjust Map button beside the Ignition Trim selector. This will adjust the map by the trim percentage and then zero the ignition trim value.

Injector Scale The injector scale is used to set the resolution of each increment in the main fuel map. It must be set before tuning the engine.

The max injector on time is determined by this value. For example: setting this parameter to 40 will give a maximum injector on time of 20 milliseconds at 0 Kpa (zero). Each load point allows for 255 increments therefore this will allow you to divide 20 milliseconds into 255 increments.

Larger injectors would require less milliseconds of on duration to supply the same volume of fuel as smaller injectors. Using this parameter allows the tuner to adjust the fuel map resolution to give a very fine adjustment per increment.

Note: As a guide, the injector time scale should be set between 40 and 80. If you find that you need to go above or bellow this range you may need to change injector size or there is a problem in the fuel delivery system.

Stinger 4 instruction manual version 2.0

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