SLC Free 2 will only work with genuine Bosch LSU 4.9 sensors. Clone sensors are not compatible.

SLC Free 2 is the successor to our very popular SLC Free Open Source Wideband Lambda Controller. This new version requires much less assembly than the previous version. Most components are now surface mount and come pre-soldered to the PCB.

Soldering of two Molex connectors and two 16-pin headers, as well as constructing cables, is required. All components are included; you only need to supply cable and wiring. All cable connectors are included, and a 3D-printed case is also included.

Recommended cable specifications are 4-conductor stranded 20 AWG and 6-conductor stranded 20 AWG.

Features:
Two new major features have recently been added to SLC Free 2: Output Sequencer and user-selectable Lambda or AFR display for gasoline fuel.

SLC Free 2 utilizes the Bosch LSU 4.9 Wideband O2 Sensor, a cost-efficient wideband O2 sensor providing 0.01 Lambda accuracy, fast response, and a rated life of 100,000 km.
Compatible with all fuel types.
Lambda Range: 0.68 Lambda linear to 1.36 Lambda.
0.01 Lambda accuracy without the need for any calibration.
O2 Sensor Temperature Monitor.

Did you know that the most common cause of inaccuracies and premature O2 sensor failure is improper control of O2 sensor temperature? Only 14Point7 branded Wideband O2 Controllers are able to monitor O2 sensor temperature.

Linear output allows easy interfacing with gauges, fuel management systems, and dataloggers.
Linear Output: 0 V at 0.68 Lambda linear to 5 V at 1.36 Lambda, 10 AFR linear to 20 AFR equivalent for gasoline.

Our innovative Output Sequencer feature means our Wideband O2 Controllers have the most accurate linear output on the market. Any device connected to the linear output will receive the most accurate AFR or Lambda signal possible.

The Output Sequencer provides a dual-level precision voltage signal to the linear output. This allows you to verify that the AFR or Lambda seen by any connected device is accurate, or to generate a two-point calibration to achieve perfect accuracy.

• MegaSquirt users can check how to use the Output Sequencer for maximum AFR accuracy.

Simulated Narrowband Output allows you to install a wideband O2 sensor in place of your narrowband O2 sensor.
Switch point at 1 Lambda, 14.7 AFR equivalent for gasoline.

SLC Free 2 features an attractive two-line backlit LCD display showing Lambda with 0.01 Lambda resolution, AFR for gasoline fuel with 0.1 AFR resolution, and O2 sensor temperature with 1 C resolution.