MED9.1 Multimap feature allows vehicles equipped with the Bosch MED9.1 ECU (commonly found in VAG 2.0 TFSI engines) to switch between multiple tuning profiles on the fly. This is typically achieved by patching the original ECU binary with custom code that redirects specific engine variables. Core Capabilities Dynamic Map Switching:
Switch between up to 4 different performance tunes (e.g., Anti-theft, Low Power/Valet, Full Power, and Full Power with Pops & Bangs). Switching Methods:
Maps are usually toggled using existing vehicle controls such as the cruise control stalk or a combination of the brake and throttle pedals. Integrated Features:
Many multimap patches also include additional functions like Launch Control (LC) No-Lift Shift (NLS) , and individual RPM limiters for each map. Implementation Guide 1. Preparation and Tools Binary File: You need the original file from your ECU. Patching Tool: Use a dedicated solution like the MED9.1-Multimap-Tool by EliasTuning or professional software like WinOLS Solutions Hex Editor/Ghidra:
Required for advanced adaptation if your specific ECU software version is not pre-supported. 2. Software Compatibility
Verify your Bosch software version. Most tools require a version of A4.8.6 or higher . Versions below this may lack the variable used for map switching. 3. Locating Critical Variables
To adapt a patch to a new version, you must find these four locations in your hex dump: Payload Address:
A "free space" area (usually 0x00 or 0xFF chunks) where the custom code will live. A variable related to cruise control status.
The main variable used to determine which map set is active. 20ms_loop:
The specific execution loop where the map-switching logic is inserted. 4. Patching the File Clone the tool EliasTuning GitHub repository.
to point to your specific binary and configuration YAML files. Run the script to apply the patch, which generates a new binary (e.g., yourfile_mapswitch.bin Flash the modified file back to your ECU using a compatible flashing tool. 5. Tuning the Maps
Once patched, you must define the maps for each slot. You can activate or deactivate NLS and LC individually for each map by setting specific bits (1 for active, 0 for inactive). variables using an MED9.1-Multimap-Tool/adaptation.md at main ... - GitHub
🚀 Unlock Your VAG MED9.1 Potential: Multimap Switching Now Available!
Are you running a Stage 1, Stage 2, or customized 2.0 TFSI (Bosch MED9.1) and want the flexibility of multiple tunes without flashing every time? Multimap switching allows you to change between performance modes, anti-theft, or fuel-efficient maps instantly, directly through your cruise control buttons or pedal inputs. 🛠️ What is MED9.1 Multimap?
Unlike modern MED17 ECUs, the older MED9.1 does not natively support easy map switching. However, through expert patching, we can enable 2 to 4 distinct map sets stored within the existing ROM. Common Use Cases: Map 1: Stock / Valet Mode Map 2: Stage 1 / Stage 2 Performance Map 3: High Torque / E85 / Race Fuel Map 4: Pops & Bangs / Special Features ⚙️ How It Works (Operation)
Activate: Turn on cruise control while driving or stationary (the EPC light will often flicker to indicate Map Mode).
Switch: Use the + or - buttons on the cruise control stalk to cycle through maps.
Feedback: The ECU can be configured to show the selected map (e.g., 1000 RPM = Map 1, 2000 RPM = Map 2).
Save: The chosen map is saved to EEPROM, so it stays active after turning off the engine. 🔧 Technical Implementation Based on: vkKraQu maps or custom patching of the binary.
No Lift Shift (NLS) & Launch Control (LC): Can be enabled on a per-map basis (e.g., enable on map 2, disable on map 1).
Tools: Usually implemented via WinOLS using specialized patches to rewrite the 20ms_loop to switch variables. 🧠 Why Choose Multimap? Instant Adaptability: Change power levels on the fly.
Safety: Switch to a lower power map when someone else is driving, or use an anti-theft map that limits RPM.
Fuel Savings: Run a restricted, eco-focused map for daily driving. MED9 journey to multi-map switching (likely a slow one)
The Ultimate Guide to MED9.1 Multimap Tuning MED9.1 multimap is a performance-tuning technology specifically designed for Bosch MED9.1 Engine Control Units (ECUs), which are commonly found in VAG-group vehicles like the Volkswagen Golf MK5 GTI and Audi S3 (8P). This software modification allows drivers to switch between up to four different "mapsets" or engine calibrations on the fly, without needing to re-flash the ECU. How MED9.1 Multimap Works
Modern MED9.1 multimap solutions typically utilize a variable within the ECU code known as vkKraQu (Variantenkriterium für Kraftstoffqualität), which was originally intended to handle different fuel qualities. By patching the ECU firmware, tuners can hijack this variable to point the ECU toward different tables for boost, ignition, and fueling based on user input. Common Switching Methods
Drivers can usually toggle between these maps using existing vehicle controls while the ignition is on (and sometimes while driving): MED9 journey to multi-map switching (likely a slow one)
When a bus flips or an active shooter occurs, command staff need to establish a triage area. Using Med91 MultiMap, the Incident Commander (IC) draws a "Green Zone" (walking wounded) and a "Red Zone" (critical) directly on the satellite view. These zones propagate instantly to every responder’s tablet.
For time-sensitive operations—wildfire tracking, ambulance routing, or military logistics—the Med91 Multimap supports dynamic, real-time data feeds. These can be ingested via WebSockets or MQTT (Message Queuing Telemetry Transport) protocols, displaying moving assets (vehicles, personnel) directly over static base maps.
Med91 Multimap is an integrated, multi-layered mapping and information platform designed for the healthcare sector, combining geospatial data, clinical resources, and operational analytics to support decision-making across care delivery, public health, and healthcare administration.
As of late 2025, the Med91 ecosystem is expanding into AI-powered predictive overlays. The next major release (Med91 Multimap v4) promises integrated machine learning models that can forecast traffic congestion, patient influx at ERs, or wildfire spread based on historical patterns overlaid on current maps. Furthermore, support for 3D tiles (like those used in digital twin simulations) is moving from beta to production, allowing urban planners and first responders to view buildings and terrain in full three-dimensional context.
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MED9.1 Multimap (Map Switching) allows VAG 2.0 TFSI (EA113) owners to store and switch between multiple tuning profiles, such as valet, eco, and race modes, directly via factory controls. The software patch, which often supports advanced features like launch control and no-lift shift, is implemented through specialized tools or automated services, typically requiring Bosch software version A4.8.6 or higher. For more details on the technical implementation, visit GitHub.