Project: BMW E12 with an M30B35 engine from an E34 '88 currently controlled with standard motronic and running great. However I want more control and learn more about engine management systems. So I will make a break out box where I can measure all signals without cutting in the original wiring. I'll post a picture when it's installed.
I installed a vaporized injection LPG system with Keihin injectors based on a master slave principle. Hence my interest in the new firmware release with dual mapping capabilities.
Current running affairs:
- Waiting on loom connectors and some additional items so I can start my initial testing and datalogging with Motronic still in control.
- I love to learn more about the firmware itself an more detailed inside information for development purposes in the future. Hence the BOB so I can preform easy testing.
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EGT
My GenBoard (preassembled serialNr=355)
MegaTune will log both mcp3208channel4 and mcp3208channel3 (raw values). However, only mcp3208channel4 is displayed on LCD page0 (mlp00).
Raw values mean that the
- real_celsius_value = egt1_offs + (raw_value * egt1_cal / 256) where typical values:
- egt1_offs=00
- egt1_cal=49 (that is decimal 73)
Fuses
These are commonly used :
| Current consumer | Fuse rate | 'Description/Comment |
| VEMS Genboard | 3A | It actually draws a couple of hundre mA, but this is the smallest automotive fuse commonly found in gas stations |
| Lambda | 5A | |
| Injectors | 10A | This could be the main fuse, and a separate 3A fuse for each injector for safety if you get a short in an injector you could fry the driver with only one main fuse |
| Ignition coil | 10A | Possibly even higher, depending on the coil primary resistance |