- Jul 31, 2022
Does anyone has this info? I would like to know it please
The ECU definitely interpolates between adjacent AFR and Timing cells, in all directions. This is why some people prefer to set for example 11 degrees of timing in all the cells ranging from 4500 RPM and 1.5 Load to 8000 RPM and 2.5 Load, if that makes sense. That way no matter what, the ECU is going to be giving you the demanded 11 degrees of timing. Same applies for the AFR table. It's not the most efficient way to do it but it works.The MAFT and other tuning solutions that change the airflow values presented to the ECU in effect change the Load the ECU computes and thereby change what the ECU looks up from both the fuel and timing maps.
If you haven't yet, you might want to read the ECU section in the Fuel System Chapter of the 1G Technical Information Manual. https://www.dsmtuners.com/threads/1g-dsm-1990-technical-information-manual.517385/
I forget off hand if the ECU interpolates between cells or not here (I know it interpolates between the high and low maps based on it's perceived fuel quality) and what it does once you go off the edge of the map, but as many of us know it will continue running until the load exceeds the fuel cut threshold and then you hit a brick wall.
Do you know how can I reflash the stock ECU? No ECM
Steve, when you hit the last load row timing is static in "load" it can still move in rpm if you are not at 7000+ That why kylet etal did the double load map back in like '03ish, and I figured out how to use the map sensor to do it off of boost directly back in '10.1G ECU's do not have flash memory. They have their software either in masked ROM which is hard coded when the chip is made or in a EPROM which requires external hardware to program the bits and UV light to erase the whole chip.
DSMLink/ECMLink replaces that EPROM with a board that has flash/EEPROM storage and their logic to program it.
There are other devices that are EPROM emulators being used to reprogram the ECU software on the fly but you need to have a solid understanding of how the ECU software works to know what/where to change. The 98/99 2g ECUs are flash based but you still need to know what to change to use them and they don't work with the 1G harness.
Around here that kinda stuff was a bad word and you got told to get dsm link and move on.
I just got to dsmecu.com on my phone idk if there is anything past the login screen though.It's 10+ years since most of us played with the code so I couldn't remember 100%.
Speaking of dsmecu.com, I haven't been able to reach it for almost as long. The DNS records for it are long gone.
I don't remember this site being hostile to discussing code modifications, some people were, and the drama caused site issues that no one needed.