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Sigma Lambda Controller Free 2

by 14Point7
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Due to illness, retail sales have been suspended until further notice.

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; 2 molex connectors, and two 16 Pin headers, as well as constructing cables, is required. All components are included, you just have to supply cable/wiring. All cable connectors are included as well as a 3d printed case is included.

Recommended cable specifications are; 4 conductor stranded 20 AWG and 6 conductor stranded 20 AWG 


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 rated life of 100,000 km
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Compatible with all fuel types
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Lambda Range: 0.68[Lambda] linear to 1.36[Lambda]
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0.01 Lambda accuracy without the need for any calibration
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O2 Sensor Temperature Monitor 
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Did you know that the most common cause of inaccuracies and premature O2 sensor failure is attributed to the O2 sensor temperature being improperly controlled? Only 14Point7 branded Wideband O2 Controllers are able to monitor O2 sensor temperature?
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Linear output allows easy interfacing with gauges, fuel management systems, and dataloggers
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Linear Output: 0[v]@0.68[Lambda] linear to 5[v]@1.36[Lambda], 10[AFR] linear to 20[AFR] equivalent for gasoline
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Simulated Narrowband Output allows you to install a Wideband O2 Sensor in place of your Narrowband O2 sensor 
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Switch point @ 1[Lambda], 14.7[AFR] equivalent for gasoline
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SLC Free 2 features an attractive 2 line backlight LCD display - displaying Lambda with 0.01[Lambda] resolution and displaying O2 sensor temperature with 1[C] resolution
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Software and Documentation

Package Contents
  • 1x SLC Free 2 Printed Circuit Board with pre-soldered surface mount components
  • 1x 3d printed case and cap
  • 1x character LCD screen
  • 1x 0 ohm resistor (only for new version with Black and Gold PCB)
  • 1x 16 pin male pinheader
  • 1x 16 pin female pinheader
  • 1x 6 pin male right angled Molex connector
  • 1x 4 pin male right angled Molex connector
  • 1x 6 pin male Molex receptacle
  • 1x 4 pin male Molex receptacle
  • 10x contacts for Molex receptacle
  • 2x 5 Amp fuses
  • 1x fuse holder
  • 1x LSU 4.9 receptacle (black)
  • 1x gasket for LSU 4.9 receptacle (Orange)
  • 6x contacts for LSU 4.9 receptacle
  • 6x grommets for LSU 4.9 receptacle (Grey)
  • 1x locking tab for LSU 4.9 receptacle (Purple)

SLC Free 2 Compatible Products:

Solid AFR Gauge

Premium Oxygen Sensor Bung

Standard Oxygen Sensor Bung

Bosch LSU 4.9

Premade Bosch Cable for LSU 4.9 and ADV

5 out of 5, based on 2 reviews
Hazwan Rahman from Malaysia on Nov 05, 2016
Cheap! Accurate and easy to assemble as long as you know how to follow instructions and know how to solder. Did I mention cheap?
Nicholas M Chang from Jamaica on Jan 12, 2015
Good quality components, easy to assemble, great price and functionality

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