E31 aftermarket ecu ?

[YounusZambia]

Hey.

Keen to know anyone running an aftermarket ecu on a 850i v12 auto ?
If so any advise or tips ?

[shogun]

I only know of some which use the M70 in replica cars like the Cobra replica. Please read here how complicated the system is, the M70 has 2 DME and 1 EML and many, many sensors, units have to deliver signals to these units and if there is something out of range, the unit goes into limp home mode :
INTRODUCTION
The Electronic Throttle Control System (EML) regulates the operation of the throttle valve(s). The scope of EML design on BMW engines provides:
• Throttle valve positioning for optimum starting
• Precise idle speed regulation without the use of an external idle control valve/circuit
• Progressive throttle opening curves matched to the driving program (with EGS/AGS interface)
• Cruise control operation without additional control modules and linkages
• Automatic synchronization of the throttles (airflow balancing) for two independent banks, throughout the entire engine speed range (M70, S70, M73 engines only)
• Intake air volume control for ASC/DSC (Automatic Slip Control/Directional Stability Control) systems
• Maximum road speed limiting
• Emergency “Failsafe” operation in the event of component failures
The EML control module is a link in the total scope of Engine Management Control. The EML is interfaced with other control modules to complete the management system, which includes:
• ECM(s) - Except E46 (EML integrated in MS42.0 ECM)
• EGS/AGS
• ABS/ASC
The main components of the EML system are:
• Accelerator pedal position sensor (PWG)
• Accelerator pedal position sensor (driver’s wish sensor - integrated in throttle housing,E46 MS42.0)
• Throttle valve assembly/assemblies with electronic control motor(s) - DK/MDK
• EML control module (MS42.0 ECM - E46)
EML SYSTEM OVERVIEW
Throttle valve control is managed electronically, using an electric motor(s), without the use of mechanical linkages or cables (except E46 - MDK).The EML system uses a microprocessor to convert the input signal for the position of the accelerator pedal into output commands for control of the throttle valve. The position of the pedal is merely a request to the control module for throttle opening. The EML module processes this input request along with other pertinent operating parameters. The throttle valve
is then moved to its proper position according to specific control unit programming. The total scope of output control functions for the EML includes:.....

more here https://www.europeantransmissions.co...MW/EML-BMW.pdf