Quote:
Originally Posted by kart driver
These damn OPFs are such a pain in the ass.
They just destroy the sound and they don’t let you avoid those using aftermarket exhaust full system not doing the tune to DME.
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I read from someone who scheduled to service his M2C (2 years / 15K km) that the dealership needs his car a full day as they also are required to upgrade the DME software: rumored to be improved BMW protection of OPF/emissions levels and against tuning. The engine start should be a little quieter after the software update.
Does anyone have more info about that DME software update ?
"Digital Motor Electronics [DME]
The comprehensive management system for your engine: Digital Motor Electronics (DME) controls all key aspects of the engine's operation, ensuring optimum reliability, maximum performance and the lowest possible fuel consumption and emissions.
By managing key engine functions, Digital Motor Electronics (DME) guarantees optimum reliability, maximum performance and the lowest possible fuel consumption and emissions. It sensors continually all factors affecting the operation of the engine. The data is then evaluated by a microprocessor and translated into commands for the fuel injection and ignition systems.
The DME system receives up to 1,000 separate items of data input per second, including engine speed, air intake volume, air temperature and density, coolant temperature, throttle position, accelerator position and vehicle speed.
DME verifies all incoming data by comparing it with the reaction of the rest of the system. If a defective sensor delivers unrealistic data, DME replaces this with preset standard values. If a spark plug fails, DME immediately cuts fuel flow to this cylinder in order to prevent engine damage.
DME looks after the electrical power system too, with sensors measuring the charge and condition of the battery as well as current electrical power consumption. By maintaining optimum battery charge levels and thus avoiding flat batteries, it prevents damage to the battery and guarantees maximum battery life, thereby helping to ensure the engine always starts readily.
BMW introduced the world's first Digital Motor Electronics system in the BMW 732i in 1979."
(source: here)