Bosch M3.3.1 506-965 Alpha-N MAF Limp Mode map
Posted: Thu Aug 13, 2020 5:04 pm
Hi guys,
I am looking to see if i can do a Alpha-N tune for my S54 ITB S52 (3.2liters) using the Bosch M3.3.1 506 DME.
I am looking at a 965 chip definition and BIN and I see there is a MAF-related limp mode map. This appears to be a transfer function between TPS % and load. Can anyone confirm? If so, could someone confirm what the formula is for CC (TPS % Position?).
If so, what do the values in the table represent? I am guessing the values are a VE% representation (raw value over 128?) of what the theoretical airmass Q (at 100%VE) would be at at the given RPM and throttle position?
For example the 506 ECU may calculate that at 4800RPM at 100%VE the airmass in in kg/hr would be 529kg/hr. The value in the 506 bin in the MAF table i see at 4800rpm and 100% TPS is 160.
Therefore, I assume the value of 160 does the following modification to the Q:
160/128 = 125%
125% * 529kg/hr = Load is 661.25kg/hr
Let me know if im way off base...
Also, i am finding this table located @DBB0:
D0 06 , 6 rows RPM
CC 07, 7 columns TPS position
If the above is true and some folks can help me with what the values in the table represent, my thought process is the following to resize the table to say 16x16 for greater resolution:
I'll move the map pointer at the end of the code to say...B980
Make it say a 16x16 table...
RPM - D0 10
Load CC 10
Thanks,
Michon
I am looking to see if i can do a Alpha-N tune for my S54 ITB S52 (3.2liters) using the Bosch M3.3.1 506 DME.
I am looking at a 965 chip definition and BIN and I see there is a MAF-related limp mode map. This appears to be a transfer function between TPS % and load. Can anyone confirm? If so, could someone confirm what the formula is for CC (TPS % Position?).
If so, what do the values in the table represent? I am guessing the values are a VE% representation (raw value over 128?) of what the theoretical airmass Q (at 100%VE) would be at at the given RPM and throttle position?
For example the 506 ECU may calculate that at 4800RPM at 100%VE the airmass in in kg/hr would be 529kg/hr. The value in the 506 bin in the MAF table i see at 4800rpm and 100% TPS is 160.
Therefore, I assume the value of 160 does the following modification to the Q:
160/128 = 125%
125% * 529kg/hr = Load is 661.25kg/hr
Let me know if im way off base...
Also, i am finding this table located @DBB0:
D0 06 , 6 rows RPM
CC 07, 7 columns TPS position
If the above is true and some folks can help me with what the values in the table represent, my thought process is the following to resize the table to say 16x16 for greater resolution:
I'll move the map pointer at the end of the code to say...B980
Make it say a 16x16 table...
RPM - D0 10
Load CC 10
Thanks,
Michon