The stock throttle map has been bugging me for a while. It feels progressive at first, but then quite aggressive, and the 2nd half of the pedal travel does not do anything, particularly at mid rpms (3500-5500). Modifying this was actually one of my justifications for buying ME in the first place, but 2 years then went by with me not really being able to figure out the throttle maps...
In that time I had a couple of spins on track in low grip scenarios out of slow corners:
Turn 2 at Sonoma in the dry on factory tires, and then a couple of times in the wet in different places. Particularly in the wet, it feels like there is a point where 1mm of pedal travel simply has too big an effect on the power output.
Finally I decided to record some data and came up with these graphs:
Note: Throttle pedal position % is along the bottom (x-axis), g/s % is along the side (y-axis). g/s% is the measured g/s as a % of the max achievable g/s for the rpm at the time.
Aha!.. proof that I am not crazy. Or at least some kind of validation. Looking at the relationship between measured g/s and pedal position, g/s ramps from close to minimum at 10% pedal position to close to max by 40% pedal position, and is basically at the max at 50% pedal for all the rpm ranges I measured.
After staring at data (Accelerator pedal position, throttle and absolute throttle position) and the available maps in MazdaEdit for some time I finally decided to modify the "Desired Engine Torque" table.
My theory being that the "throttle duty" tables are used to calibrate the throttle (they alter the amount of throttle requested for a given pedal position), while the "Desired Engine Torque" table modifies the amount of torque (engine output) the ecu tries to achieve for a given throttle.
Here is the stock "Desired Engine Torque" table. You can see that it seems to ramp pretty close to max by 39 throttle (which is a little under 50% of the 84 max).
So, I made the "Desired Engine Torque" table linear, with the hope of getting a linear engine torque output to throttle pedal position.
I have yet to re-generate my graphs, but this seems to have had the desired effect.
I then altered my throttle duty tables a little bit to make the pedal progressively more responsive with the aim of improving control for small amounts of throttle. Some of this is already build in to the stock map. I just smoothed it out a bit, to end up with this for all the variants (A, B, C, etc):
In that time I had a couple of spins on track in low grip scenarios out of slow corners:
Turn 2 at Sonoma in the dry on factory tires, and then a couple of times in the wet in different places. Particularly in the wet, it feels like there is a point where 1mm of pedal travel simply has too big an effect on the power output.
Finally I decided to record some data and came up with these graphs:
Note: Throttle pedal position % is along the bottom (x-axis), g/s % is along the side (y-axis). g/s% is the measured g/s as a % of the max achievable g/s for the rpm at the time.
Aha!.. proof that I am not crazy. Or at least some kind of validation. Looking at the relationship between measured g/s and pedal position, g/s ramps from close to minimum at 10% pedal position to close to max by 40% pedal position, and is basically at the max at 50% pedal for all the rpm ranges I measured.
After staring at data (Accelerator pedal position, throttle and absolute throttle position) and the available maps in MazdaEdit for some time I finally decided to modify the "Desired Engine Torque" table.
My theory being that the "throttle duty" tables are used to calibrate the throttle (they alter the amount of throttle requested for a given pedal position), while the "Desired Engine Torque" table modifies the amount of torque (engine output) the ecu tries to achieve for a given throttle.
Here is the stock "Desired Engine Torque" table. You can see that it seems to ramp pretty close to max by 39 throttle (which is a little under 50% of the 84 max).
So, I made the "Desired Engine Torque" table linear, with the hope of getting a linear engine torque output to throttle pedal position.
I have yet to re-generate my graphs, but this seems to have had the desired effect.
I then altered my throttle duty tables a little bit to make the pedal progressively more responsive with the aim of improving control for small amounts of throttle. Some of this is already build in to the stock map. I just smoothed it out a bit, to end up with this for all the variants (A, B, C, etc):
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