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__NOTOC__
 
<strong>The SimosWiki</strong>
 
<strong>The SimosWiki</strong>
  
 
This site is dedicated to tuning the Simos(18) family of ECUs commonly found in the MQB platform of VW/Audi cars.
 
This site is dedicated to tuning the Simos(18) family of ECUs commonly found in the MQB platform of VW/Audi cars.
  
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As with anything, you make modifications at your own risk. Nobody else is responsible for anything that happens while you're tuning your car.  
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Much of the information here revolves around the use of Eurodyne Maestro since it was the first end user tuning software available.  Eurodyne does change some maps and axis names, but the vast majority of ecu strategies are kept consistent with the way Continental designed it. An example of where there's a change in the software is the Boss file wastegate duty tables.  The factory uses a complex scheme to calculate the exhaust flow vs Boost, while Eurodyne changes this to use a simple RPM vs. Boost level.  Examples of the two different tables are on the [[Eurodyne_Tables|Eurodyne Maestro Tables]] page.
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<strong>THIS WIKI IS A WORK IN PROGRESS</strong>.  We went live with it on 9/21/2020, and we're working on getting info in place.
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=== Select a topic from the left nav bar or the links below ===
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[[High_Level_Overview|High level overview of ECU operation]]
  
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If the information here has been helpful, consider donating. Domain names and web hosting aren't free.
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[[Boost_Management|Boost Management]]
  
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SIMOS is a registered trademark of CONTINENTAL AUTOMOTIVE GMBH.  This site has no affiliation.
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[[Fuel_Management|Fueling Management]]
  
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== High level ecu functionality ==
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[[Reverse_Engineering_Information|Reverse Engineering]]
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The ecu in any car is designed to control how the engine operates. Car manufacturers want their engines to produce power, while still being fuel efficient, reliable, quiet, etc.  The way they accomplish this is by defining "maps" which contain modifiable parameters that the ecu will use to make decisions on how the engine should be working. In the case of the Simos18, there are both measured values and modeled values in these maps.
 
  
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=== In short: ===
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[[Open_Source_Tuning|Open Source Tuning]]
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The accelerator pedal tells the ecu how much torque the driver wants the engine to produce.
 
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That driver input is referenced against a table that defines the maximum torque available at any given RPM.
 
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That target torque value is referenced against other maps which define how much airflow, followed fuel and timing, the ecu should target to achieve the driver request torque value.
 
  
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=== Editing Software ===
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Eurodyne Maestro (and HPTuners as of late 2020) are the only software suites that allow for end user modifications to the calibration tables
  
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== Boost management ==
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[[Eurodyne_Tables|Eurodyne Maestro Tables]] is an overview of the tables available in Eurodyne Maestro
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The replacement for displacement is boost. We can achieve impressive power levels in small displacement motors by putting turbos on them. We'll assume a working knowledge of forced induction... If you don't already have that, there's plenty of places to look.
 
  
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Once the ecu has calculated the amount of torque the driver wants, it'll use that to dictate how much boost it should try and create. The engine will convert the driver request torque value into an airflow volume. I.e. to make T torque at R rpm we need V volume of air.
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[[HP_Tuners|HP Tuners]] is an overview of HP Tuners software
  
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Modeled tables:
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=== Helpful Links ===
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The ecu has no way to calcute actual airflow. There's no MAF. what it does have is PUT and MAP sensors ("PUT" stands for pressure upstream throttle, vs "MAP" which you should already be familiar with.), Baro sensor, temperature sensors, etc. If you know the airflow characteristics of the turbo, you can calcute the volume of air that it flows given its output pressure. So to target V volume of air, the ecu assumes that it should target B boost pressure (PUT set point or PUT_SP)
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Note: External links will attempt to open in a new tab<br>
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[https://cobbtuning.atlassian.net/wiki/spaces/PRS/pages/143753246/Volkswagen+MQB+Tuning+Guide Cobb Tuning Volkswagen MQB Tuning Guide]<br>
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[https://ecutek.atlassian.net/wiki/spaces/SUPPORT/pages/21430325/VW+EA888+Engine+Tuning Ecutek EA888 Tuning Guide]<br>
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[https://cobbtuning.atlassian.net/wiki/spaces/PRS/pages/619872308/Volkswagen+MQB+6+Speed+DSG+Tuning+Guide Cobb Tuning 6-Speed DSG Tuning Guide]<br>
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[https://cobbtuning.atlassian.net/wiki/spaces/PRS/pages/1052606501/Volkswagen+MQB+7+Speed+DSG+Tuning+Guide Cobb Tuning 7-Speed DSG Tuning Guide]<br>
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[https://www.youtube.com/watch?v=5wQ9lQq2vDQ Maestro MK7 GTI MQB, Basic overview (YouTube video)] <br>
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[https://www.youtube.com/watch?v=0Yglshxokv4 Understanding AFR and Lambda]<br>
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[http://www.nefariousmotorsports.com/forum/ Nefmoto] (Not a whole lot that's simos specific)<br>
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[https://s4wiki.com/wiki/Tuning S4 Tuning Wiki] (Not Simos - but still can be helpful)<br>
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[https://docs.google.com/spreadsheets/d/17nKlgeqHBmVnqw4OKaAGOJwZtXGkLNJo1yFMqe5oHck/edit?usp=sharing PID List (work in progress)]
  
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But there's more involved in choosing a PUT_SP than just modeled airflow tables. We also have tables that define the maximum turbo pressure ratio.  At certain target airflow volumes and RPMs, we can tell the ecu to limit the PUT.  
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=== Just saying ===
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As with anything, you make modifications at your own risk. Nobody else is responsible for anything that happens while you're tuning your car.  
  
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And once we've got our PUT_SP, how do we limit the boost?  Wastegate duty cycle (or wastegate_sp). 
 
  
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The Simos family of ECUs use electronic wastegate control rather than a traditional boost actuated wastegate. Typically there's a spring that will operate at a fixed boost pressure, and a boost controller will bleed off a certain amount of pressure so the spring operates at a higher boost.  An electronic wastegate works by having a target position at a certain boost level.
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If the information here has been helpful, consider donating. Domain names and web hosting aren't free.  
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*Paypal: webmaster@simoswiki.com
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*Bitcoin:  34JVVe9pE7gZJ5Pu1B3rhWCPiV5SWavQL2
  
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== Fueling ==
 
  
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== Timing ==
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SIMOS is a registered trademark of CONTINENTAL AUTOMOTIVE GMBH.  This site has no affiliation.

Latest revision as of 22:24, 31 January 2021

The SimosWiki

This site is dedicated to tuning the Simos(18) family of ECUs commonly found in the MQB platform of VW/Audi cars.

Much of the information here revolves around the use of Eurodyne Maestro since it was the first end user tuning software available. Eurodyne does change some maps and axis names, but the vast majority of ecu strategies are kept consistent with the way Continental designed it. An example of where there's a change in the software is the Boss file wastegate duty tables. The factory uses a complex scheme to calculate the exhaust flow vs Boost, while Eurodyne changes this to use a simple RPM vs. Boost level. Examples of the two different tables are on the Eurodyne Maestro Tables page.

THIS WIKI IS A WORK IN PROGRESS. We went live with it on 9/21/2020, and we're working on getting info in place.


Select a topic from the left nav bar or the links below

High level overview of ECU operation

Boost Management

Fueling Management

Reverse Engineering

Open Source Tuning

Editing Software

Eurodyne Maestro (and HPTuners as of late 2020) are the only software suites that allow for end user modifications to the calibration tables

Eurodyne Maestro Tables is an overview of the tables available in Eurodyne Maestro

HP Tuners is an overview of HP Tuners software

Helpful Links

Note: External links will attempt to open in a new tab
Cobb Tuning Volkswagen MQB Tuning Guide
Ecutek EA888 Tuning Guide
Cobb Tuning 6-Speed DSG Tuning Guide
Cobb Tuning 7-Speed DSG Tuning Guide
Maestro MK7 GTI MQB, Basic overview (YouTube video)
Understanding AFR and Lambda
Nefmoto (Not a whole lot that's simos specific)
S4 Tuning Wiki (Not Simos - but still can be helpful)
PID List (work in progress)

Just saying

As with anything, you make modifications at your own risk. Nobody else is responsible for anything that happens while you're tuning your car.


If the information here has been helpful, consider donating. Domain names and web hosting aren't free.

  • Paypal: webmaster@simoswiki.com
  • Bitcoin: 34JVVe9pE7gZJ5Pu1B3rhWCPiV5SWavQL2


SIMOS is a registered trademark of CONTINENTAL AUTOMOTIVE GMBH. This site has no affiliation.

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