E46 323i Related Code

This is the git repository related to my 2000 BMW E46 323i. I'm using this repository to keep track of coding and ECU data.

Table of Content

1. Introduction
2. Directories
   1. Tree
   2. ECU
      1. Tests
      2. E85
3. Maths

Introduction

This E46 comes from Germany and has been made for the French market. It thus has the european options by default.

Being a 323i with a M52TUB25 engine, the ECU is a MS42, with the version 0110C6.
The version of each module gotten via NCS Expert is written in the file name.

The stock injectors are Siemens VDO 13537546244, with a flow rate of 215cc/min (~20.5lb/h).

Directories

Tree

• E46_323i_backup
  • / contains the 32 and 512kb ROM files from the ECU. Extracted with Ms4x Flasher
  • /CODING contains the stock module data. Extracted with NCS Expert
• ECU
  • / contains tuned maps
  • /tests contains maps only used for testing purposes
  • /E85 maps relative to E85
• logs
  • /RomRaider_logs contains logs acquired by RomRaider

ECU

This directory contains the tuned maps. Currently, only maps for E85 are being developed.

Tests

ECU/tests/
 - MS42_0110C6_32KB_hatrix_test_1.bin

This directory contains test bins. They are mostly used to try out some options and see if everything, from tuning, flashing to operation, is working properly.

• MS42_0110C6_32KB_hatrix_test_1.bin
  • Engine Speed Soft Limiter (AT & MT): 4000 RPM
  • Engine Speed Hard Limiter (AT & MT): 4100 RPM
  • Throttle Body Speed: 60, instead of 44

E85

ECU/E85/
 - MS42_0110C6_32KB_hatrix_E85_V0.1.bin
 - MS42_0110C6_32KB_hatrix_E85_V0.2.bin
 - MS42_0110C6_32KB_hatrix_E85_V0.3.bin
 - MS42_0110C6_32KB_hatrix_E85_V0.4.bin

Each iteration is a modification upon the previous bin. The first one being a difference to the stock bin.

MS42_0110C6_32KB_hatrix_E85_V0.1.bin

This is the first map for my E85 tune. The engine should start and run without too much trouble.

• Fuel Maps -> Multiplying by 1.3
  • Fuel Injection before Cranking: +30%
  • Cranking Fuel at Cold Engine Start: values ranging from +130% to +50%
  • Full Load Enrichment: +30%
  • Fuel Injection Base: +30%
  • Fuel Injection Idle Speed Warm Engine: +30%
  • Fuel Injection Idle Speed Cold Engine: +30%
  • Fuel Injection Part Load Bank 1 Warm Engine: +30%
  • Fuel Injection Part Load Bank 2 Warm Engine: +30%
• Limiting the engine RPM -> Max duty cycle of 80%
  • Engine Speed Soft Limiter (AT & MT): 5000 RPM
  • Engine Speed Hard Limiter (AT & MT): 5100 RPM
  • Engine Speed Limiter (VSS Error): 5000 RPM
• Full Load Recognition -> Turning off full load by putting max value
  • Full Load Basic: 120%
  • Full Load DISA Active: 120%
  • Full Load VANOS Active: 120%
• Lambda Adaptation for flex fuel:
  • Multiplicative Fuel Learning - Min Limit: -30%
  • Multiplicative Fuel Learning - Min Limit: 30%
  • Multiplicative Fuel Learning - Min RPM: 600
• MPG Gauge Correction -> divided by 1.3
• After Start Enrichment -> values ranging from 65% to 10%

MS42_0110C6_32KB_hatrix_E85_V0.2.bin

• MPG Gauge Correction -> Reverted to original values

MS42_0110C6_32KB_hatrix_E85_V0.3.bin

• Alpha/n Injection Table -> +30%

MS42_0110C6_32KB_hatrix_E85_V0.4.bin

Applied the function 0.0325611168538154 x + -0.14561668444972975 with x being the load, on the following maps:

• Fuel Injection Base
• Fuel Injection Part Load Bank 1 Warm Engine
• Fuel Injection Part Load Bank 2 Warm Engine

MS42_0110C6_32KB_hatrix_E85_V0.5.bin

This map is based on the V0.3 version.

• Changed the LTFT (Multiplicative Fuel Learning) limit values:
  • Minimum Limit: -35%, to account for a possible change for regular gas
  • Maximum Limit: +10%, to trigger a fault if too much gas is needed

MS42_0110C6_32KB_hatrix_E85_V0.6.bin

• Activating Full Load Enrichment
  • Full Load DISA Active: reverted to original
  • Full Load VANOS Active: reverted to original
  • Full Load Basic: reverted to original
• Full Load Enrichment: +35% compared to base map

MS42_0110C6_32KB_hatrix_E85_V0.7.bin

• Changed the rev limiter. Even though the IPW can have a too-high duty cycle at those RPMs, it is very unlikely the incoming air is enough to reach them.
  • Changed soft limiter from 4992 to 6784 RPM
  • Changed hard limiter from 5088 to 7008 RPM
  • Changed Speed Sensor (VSS) Error limiter from 4992 RPM to 6496 RPM

Improvements

Below are listed improvements that could be made on that map.

• Multiplicative Fuel Learning - Min Load: ?
• Additive Fuel Learning - Max RPM: ?
• Idle Speed
  • Drive Engaged
  • Without Extra Load
  • With Drive + AC
  • With AC
• Fuel Injection Warmup Enrichment
• Correct Full Load Enrichment to match E85 Max Power Rich AFR