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·Overview updated for new TuneEdit versions up through v3.9.4.4:
TuneEdit 101 update
Time to update the old TuneEdit 101 thread. TuneEdit has evolved considerably since the old thread was written, and now offers even more control.
Let's start with the basics of fueling.
The F tables control fuel sprayed to each cylinder based on rpm and throttle position sensor (TPS). The Fuel % Trim table alters all of the F tables equally.
The L tables use the manifold air pressure (MAP) sensor to control fueling under acceleration, and at low rpm. This is different from most cars where the MAP sensor tables are used at higher load and rpm because most cars do not use individual throttles per cylinder, and as a result do not have the resolution from the MAP sensor that is seen with individual throttles.
The F_L Switch table alters when the ECU changes over from being predominantly based on the MAP sensor (L tables) to the TPS sensor (F tables). But acceleration enrichment is still controlled by the MAP sensor even when the TPS is the primary sensor used. Altering the point where the engine changes from one table to the other can help to improve transient response and smooth out issues that can occur when the changeover is not smooth or occurs at an engine load and speed where intake and/or exhaust pulse tuning can be causing issues.
You need to use all of the above to tune for different engine speeds and loads. And to best tune for throttle response and acceleration.
The I tables are for ignition advance. I1 is in neutral. I2 is in gear. The Ignition Trim table alters the ignition timing in all cylinders. More is not better, and some of the stock tunes have more than the engine really wants. Just 2 degrees too much advance at high rpm or at peak torque rpm can drop 2% from the engine's output. Or it can cause the engine to ping at part throttle at low rpm under load or when the throttle is suddenly opened (burst knock).
The AFR table uses the narrow band Lambda (O2) sensor to keep the fuel delivered at low loads and engine speeds near optimum for best burn in the catalytic converters. If these have been removed... use your imagination.
The Idle Speed table lets you alter the idle speed at different engine temperatures. This is different from setting the idle speed under EDIT on older versions of TuneEdit, and can help with idle issues when it is hot or cold outside.
TuneEdit 101 update
Time to update the old TuneEdit 101 thread. TuneEdit has evolved considerably since the old thread was written, and now offers even more control.
Let's start with the basics of fueling.
The F tables control fuel sprayed to each cylinder based on rpm and throttle position sensor (TPS). The Fuel % Trim table alters all of the F tables equally.
The L tables use the manifold air pressure (MAP) sensor to control fueling under acceleration, and at low rpm. This is different from most cars where the MAP sensor tables are used at higher load and rpm because most cars do not use individual throttles per cylinder, and as a result do not have the resolution from the MAP sensor that is seen with individual throttles.
The F_L Switch table alters when the ECU changes over from being predominantly based on the MAP sensor (L tables) to the TPS sensor (F tables). But acceleration enrichment is still controlled by the MAP sensor even when the TPS is the primary sensor used. Altering the point where the engine changes from one table to the other can help to improve transient response and smooth out issues that can occur when the changeover is not smooth or occurs at an engine load and speed where intake and/or exhaust pulse tuning can be causing issues.
You need to use all of the above to tune for different engine speeds and loads. And to best tune for throttle response and acceleration.
The I tables are for ignition advance. I1 is in neutral. I2 is in gear. The Ignition Trim table alters the ignition timing in all cylinders. More is not better, and some of the stock tunes have more than the engine really wants. Just 2 degrees too much advance at high rpm or at peak torque rpm can drop 2% from the engine's output. Or it can cause the engine to ping at part throttle at low rpm under load or when the throttle is suddenly opened (burst knock).
The AFR table uses the narrow band Lambda (O2) sensor to keep the fuel delivered at low loads and engine speeds near optimum for best burn in the catalytic converters. If these have been removed... use your imagination.
The Idle Speed table lets you alter the idle speed at different engine temperatures. This is different from setting the idle speed under EDIT on older versions of TuneEdit, and can help with idle issues when it is hot or cold outside.