Looking for guidance for coding hybrid thresholds

mr.turbo95 · 06-27-2025, 11:35 AM

Hi everyone,

I own a 2019 530e, and while I am generally happy with the car, I find myself toggling between electric and petrol manually quite a bit, due to the fact that the car seems to be programmed to be an EV-first, rather than petrol-first.

Just to leave it out here, the electric modes are as follows:

AUTO eDrive
- Runs on electric motor until either more than 40% power is requested or the speed exceeds 95 km/h.

MAX eDrive
- Runs on electric motor until either more than 60% power is requested or the speed exceeds 140 km/h.

My country doesn't have highways, and the highest legal limit is 90 km/h. The issue here is that even if I have as little as 10% battery, in AUTO eDrive mode the car will drive on electric at legal speeds, thus draining the battery quite fast, at a speed that the petrol engine would be very efficient.

What I would like to do is to be able to change the thresholds for the electric motor in AUTO eDrive to 65 km/h and 30% power demand. These numbers are just what sounds good in my head right now, and maybe a different combination of thresholds would work better for my needs.

I am a software developer, with quite a bit of experience of reverse engineering and writing ASM x86. However, I have never done anything related to cars, and I'm thinking maybe this would be a good opportunity to start. If anyone knows anything that could point me in the right direction, I would be very grateful.

Some hints that could help me out are:

Which ECUs could contain the values I'm looking for? I assume there would be two - one for displaying the stuff on the instrument cluster and one for the actual behavior of the car.
Which programs would I need to do this? Find values, write the new values, etc.

Thank you in advance to anyone who can point me in the right direction.

06-27-2025, 11:35 AM	#1
mr.turbo95 New Member 0 Rep 7 Posts Drives: BMW 530e G30 Join Date: Sep 2024 Location: Moldova iTrader: (0)	Looking for guidance for coding hybrid thresholds Hi everyone, I own a 2019 530e, and while I am generally happy with the car, I find myself toggling between electric and petrol manually quite a bit, due to the fact that the car seems to be programmed to be an EV-first, rather than petrol-first. Just to leave it out here, the electric modes are as follows: AUTO eDrive - Runs on electric motor until either more than 40% power is requested or the speed exceeds 95 km/h. MAX eDrive - Runs on electric motor until either more than 60% power is requested or the speed exceeds 140 km/h. My country doesn't have highways, and the highest legal limit is 90 km/h. The issue here is that even if I have as little as 10% battery, in AUTO eDrive mode the car will drive on electric at legal speeds, thus draining the battery quite fast, at a speed that the petrol engine would be very efficient. What I would like to do is to be able to change the thresholds for the electric motor in AUTO eDrive to 65 km/h and 30% power demand. These numbers are just what sounds good in my head right now, and maybe a different combination of thresholds would work better for my needs. I am a software developer, with quite a bit of experience of reverse engineering and writing ASM x86. However, I have never done anything related to cars, and I'm thinking maybe this would be a good opportunity to start. If anyone knows anything that could point me in the right direction, I would be very grateful. Some hints that could help me out are: Which ECUs could contain the values I'm looking for? I assume there would be two - one for displaying the stuff on the instrument cluster and one for the actual behavior of the car. Which programs would I need to do this? Find values, write the new values, etc. Thank you in advance to anyone who can point me in the right direction.
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