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Learn more about MD-Lambda-View, the universal data logger for adjusting the carburettor with lambda sensor

Technical Data

Power supply:

9V -15V

Power consumption:

0.8A - 4A (depending on the heating current of the lambda sensor)

Connection protocol:

WIFI, password 8 characters

Entrances:

Engine speed, throttle position, lambda sensor

Outputs:

RGB LED

Operation and settings

Web server

Dimensions:

70mm x 36mm x 18mm

Lambda sensor controller based on

SLCFree by 14point7

How does MD-LAMBDA-VIEW work

Block diagram

MD-Lambda-View is an electronic module. It consists of a controller for controlling a Bosch LSU 4.9 broadband sensor and a second controller for processing the lambda signal and detecting the throttle or carburetor position, engine speed, and on-board voltage. The second controller also provides the Wi-Fi access point and the user interface as a website. By providing a website, MD-Lambda-View is platform-independent. It can be accessed with any Wi-Fi-enabled device. The provided Wi-Fi is password-protected. There is an initial password that can be changed by the user at any time.

MD-Lambda-View permanently writes all four measured values (lambda value, engine speed, throttle position, and on-board voltage) to a table. This data is retained in the table until the browser cache is cleared. The table is updated when MD-Lambda-View is restarted.

The table can be exported in CSV format and further processed with MD-Lambda-View 3D-Surface or with all common spreadsheet programs.

Connection of lambda sensor and carburetor

You need a power supply from terminal 15 (switched +12V) and a ground connection. This will get MD-Lambda-View up and running. To obtain information about the mixture composition, you need a Bosch LSU 4.9 broadband sensor and a suitable weld-in sleeve, which must be welded into your vehicle's manifold if one isn't already present.

I do not intend to offer lambda sensors and weld-in sleeves in my online shop, as these can be obtained cheaply on relevant websites.

Instructions for installing the lambda sensor and the sensor's technical data can be found in the data sheet on Bosch's website.

Lambda_Sensor_LSU_4.9_Datasheet

To determine the engine speed, MD-Lambda-View is connected to terminal 1 of your vehicle's ignition coil. This works for all conventional breaker and transistor ignition systems. For CDI ignition systems, the engine speed signal is picked up via an adapter on the ignition cable. A suitable adapter can be ordered from motogadget Berlin, among others. Ignition signal pickup | motogadget GmbH .

The throttle valve or carburetor slide position is determined using a potentiometer, a conventional throttle position sensor, or the specially developed cable adapter. MD-Lambda-View provides three connection cables for this purpose as part of a separately available wiring harness. Red = 5V, black = ground, and blue = measured value. For a conventional potentiometer, this means that red and black must be connected to the ends of the wiper track, and blue to the wiper itself.

Connection Diagram for Transistor or Breager Ignitions

MD-Lambda-View cable pull sensor

A very simple solution for determining the throttle valve position or the position of the carburetor slide is to use the cable sensor specially developed for MD-Lambda-View. This is installed in place of the standard throttle cable. The cable sensor behaves like a conventional throttle cable. All commands to the throttle grip are transmitted to the throttle valve or carburetor as usual, except that a potentiometer continuously determines the current position via an integrated cable guide and transmits it to MD-Lambda-View.

More Info

Throttle position sensors

The MD-Lambda-View cable sensor or simply a potentiometer with at least 5kOhm resistance is best suited as a throttle position sensor. If it's also waterproof, everything's fine. Of course, you have to think about the mounting to the throttle body and the connection to the throttle shaft.

Another solution is to use a throttle position sensor from the automotive sector. These are also essentially simple potentiometers, but often have additional functionality. They usually have one or two mounting holes, a connector for watertight connection via standard vehicle connectors, and some even have an internal return spring. It's important to note the direction of rotation here.