Obviously this will be in progress for a long time....but here we go. This info if a conglomerate of stuff printed in manuals, found on the internet and pulled from my own head. Enjoy!
Part Throttle AFR Tracking
The idea behind Part Throttle AFR Tracking (PTT) is wide ranging. It allows you to disconnect the O2 sensor connection to the ECU and let the MAFT pro trim your AFM input accordingly during idle and closed loop. Note that PTT idle correction is only +/- 10% and cruise/lean is +10/-25%.
There are three parts to PTT- Idle, Cruise and Lean: Idle is meant for idle conditions, Cruise is meant for steady-state cruising conditions, Lean is an additional level of adjustment allowing for a time delay before engaging.
In order to make proper use of this, I HIGHLY recommend you start off tuning the MAFT Pro with the O2 sensor connected. This will enable the Vf function and allow you to trim the low/mid throttle maps according to what the ECU wants. Once you've properly tuned your car, you can switch over to using PTT and ditch the ECU O2 sensor.
Here's a breakdown of the parameters of PTT:
Afterstart (in the System Settings panel)- the duration of time before PTT kicks on (?, perhaps there's a base 5 min there?)
Idle
In short once the engine has been running for 5+ minutes AND the TPS is below Idle TPS AND the RPM is below Idle RPM, the MAFT pro will begin to scale the AFM input to achieve Idle A/F Ratio.
Cruise
In short once the engine has been running for 5+ minutes AND the TPS is above Idle TPS AND the TPS is below Cruise TPS AND the RPM is below Cruise RPM AND the load is below Cruise Load, the MAFT pro will begin to scale the AFM input to achieve Cruise A/F Ratio.
Lean
In short once the engine has been running for 5+ minutes AND the TPS is above Idle TPS AND the TPS is below Cruise TPS AND the RPM is below Cruise RPM AND the load is below Lean Load AND Lean Delay has passed, the MAFT pro will begin to scale the AFM input to achieve Lean A/F Ratio.
Gain- Applies to all PTT, this is the speed at which PTT will attempt to maintain XX A/F Ratio. (units?)
Part Throttle AFR Tracking
The idea behind Part Throttle AFR Tracking (PTT) is wide ranging. It allows you to disconnect the O2 sensor connection to the ECU and let the MAFT pro trim your AFM input accordingly during idle and closed loop. Note that PTT idle correction is only +/- 10% and cruise/lean is +10/-25%.
There are three parts to PTT- Idle, Cruise and Lean: Idle is meant for idle conditions, Cruise is meant for steady-state cruising conditions, Lean is an additional level of adjustment allowing for a time delay before engaging.
In order to make proper use of this, I HIGHLY recommend you start off tuning the MAFT Pro with the O2 sensor connected. This will enable the Vf function and allow you to trim the low/mid throttle maps according to what the ECU wants. Once you've properly tuned your car, you can switch over to using PTT and ditch the ECU O2 sensor.
Here's a breakdown of the parameters of PTT:
Afterstart (in the System Settings panel)- the duration of time before PTT kicks on (?, perhaps there's a base 5 min there?)
Idle
- Idle TPS- the TPS V below which idle PTT is active
- Idle RPM- the RPM level below which idle PTT is active
- Idle A/F Ratio- the desired idle AFR
In short once the engine has been running for 5+ minutes AND the TPS is below Idle TPS AND the RPM is below Idle RPM, the MAFT pro will begin to scale the AFM input to achieve Idle A/F Ratio.
Cruise
- Cruise TPS- the TPS V below which cruise PTT is active
- Cruise RPM- the RPM level below which cruise PTT is active
- Cruise Load- the load level (KPa) below which cruise PTT is active
- Cruise A/F- the desired AFR
In short once the engine has been running for 5+ minutes AND the TPS is above Idle TPS AND the TPS is below Cruise TPS AND the RPM is below Cruise RPM AND the load is below Cruise Load, the MAFT pro will begin to scale the AFM input to achieve Cruise A/F Ratio.
Lean
- Lean Load- the load level (KPa) below which Lean PTT is active
- Lean Delay- the time (in seconds) before PTT Lean is activated AFTER all other parameters have been met
- Lean A/F Ratio- the desired AFR
In short once the engine has been running for 5+ minutes AND the TPS is above Idle TPS AND the TPS is below Cruise TPS AND the RPM is below Cruise RPM AND the load is below Lean Load AND Lean Delay has passed, the MAFT pro will begin to scale the AFM input to achieve Lean A/F Ratio.
Gain- Applies to all PTT, this is the speed at which PTT will attempt to maintain XX A/F Ratio. (units?)