Hello,
As I have recently acquired a A3 AGU 1.8T 150hp and can't leave anything stock calibration-wise, I began to study Motronic M3.8.x that can be found in 1.8Ts AEB / AGU and AJL.
Those are basically all the 1.8Ts which are throttle cable driven (as opposed to DBW which are ME7.x)
I propose this thread as I will learn more about this ECU and tuning it so that everyone can benefit from it. As there seems to be professional tuners (companies) on the forum, please tell me if some infos are not well seen to be shared here.
First things first:
Those "old" Motronics are doing almost everything based on MAF info (pay attention to vacuum/boost leaks and that your MAF and O2 sensor are in good condition). All those infos are from some documentation found either through official documents or on the web.
What this software does is convert MAF into LOAD => Tl in milliseconds
Q: airflow | n: engine speed | Ki: injector constant
LOAD is the theoretical Injector Time needed to reach Lambda= 1 with the current injector setup
Injector opening time is then corrected (calculated) to take into account the varieties of engines (fuel trims...) and operating conditions by introducing MULTIPLICATIVE factors to correct the theoretical injector time to the ACTUAL time for injection (Ti) needed at that instant and an ADDITIVE factor (Tv) is added to compensate for the different injector latency time based on battery voltage (known as TVUB on ME7)
I can continue sharing some info on M3.8.x if this kind of old softwares are still interesting for some of you willing to understand what the ECU does or to tune their engine themselves
As I have recently acquired a A3 AGU 1.8T 150hp and can't leave anything stock calibration-wise, I began to study Motronic M3.8.x that can be found in 1.8Ts AEB / AGU and AJL.
Those are basically all the 1.8Ts which are throttle cable driven (as opposed to DBW which are ME7.x)
I propose this thread as I will learn more about this ECU and tuning it so that everyone can benefit from it. As there seems to be professional tuners (companies) on the forum, please tell me if some infos are not well seen to be shared here.
First things first:
Those "old" Motronics are doing almost everything based on MAF info (pay attention to vacuum/boost leaks and that your MAF and O2 sensor are in good condition). All those infos are from some documentation found either through official documents or on the web.
What this software does is convert MAF into LOAD => Tl in milliseconds
Q: airflow | n: engine speed | Ki: injector constant
LOAD is the theoretical Injector Time needed to reach Lambda= 1 with the current injector setup
Injector opening time is then corrected (calculated) to take into account the varieties of engines (fuel trims...) and operating conditions by introducing MULTIPLICATIVE factors to correct the theoretical injector time to the ACTUAL time for injection (Ti) needed at that instant and an ADDITIVE factor (Tv) is added to compensate for the different injector latency time based on battery voltage (known as TVUB on ME7)
I can continue sharing some info on M3.8.x if this kind of old softwares are still interesting for some of you willing to understand what the ECU does or to tune their engine themselves