Bosch LSU ADV lambda sensor
The Bosch LSU ADV lambda sensor is the next generation wideband oxygen sensor. Compared to the older 4.9 (and 4.2) sensor the LSU ADV is more accurate at wider working temperature range. It also heats up quicker.
It is now the recommended sensor for motorsport applications.
- 7.4 AFR to 25.5 measurement range
- Accuracy <0.1AFR
- Simple to install and operate
- 0-5V Analogue Output
- 100% Accurate digital signal between Controller and Display
- Smart warmup feature ensures long life of the lambda sensor.
- Uses PID algorithm to control probe temperature
- Initial Heat up of sensor designed according to Bosch specification
- Immediate sensor turn-off under fault condition to protect sensor
- 3D Printed enclosure
- Good visibility, fast response screen
- Adjustable brightness
- 0-5V Signal input or LDperformance digital signal (automatically recognised)
- Big digit size – 1 inch, instead of the common 0.56".
- Size: 78mm x 40mm
- <0.5% accurate voltage reference
- Separate voltage reference from display supply
- 10bit ADC with improved resolution using successive approximation algorithm
- Hardware and software noise filter
Brightness can be controlled using a potentiometer connected as shown below.
Or alternatively, to dim the display just connect 12V to the "12V Brightness" port of the connector.
How to use
- Connect Bosch LSU ADV oxygen sensor using the extension lead to the Controller
- Connect 12V and GND to the corresponding terminals of the Controller and AFR display
- Connect one of the Controller signal wires to the AFR Display input
The analogue 0-5V output corresponds to 7.35AFR to 22.39AFR. To convert from voltage to AFR use the formula: V*15.04/5+7.35. The output is compatible with many Wideband AFR displays as well as the LDperformance AFR display.
During the initial heat-up phase of the sensor, the output will toggle 10AFR, 20AFR. This is done to verify the accuracy of the signal and the gauge.
The Digital Output works only with the LDperformance AFR display and is used to 100% accurately display AFR on the gauge.
The LDperformance AFR display has a single input which can automatically detect if analogue or digital signal is connected.
It is possible to reconfigure the 0-5V wideband output to show 0-1V Narrowband signal. To do this connect the wire to ground and turn on the controller for 3 seconds. To switch back to 0-5V output repeat the same precedure.
- If the wideband kit is going to be permanently installed in a vehicle, the Smart warmup function must be activated.
- It prolongs the life of the sensor by avoiding rapid heat up during the initial water-condensation phase.
- To activate it, connect the digital output wire to ground and power up the controller for 3 seconds. (Repeating the same procedure will disable the function.)
- Many wideband sensors fail prematurely because rarely aftermarket controller manufacturers pay attention to the sensor warmup procedure when the engine is cold. What usually happens is condensed water from the exhaust hits the hot sensor and the shock damages the sensing element.
- The LDperformance Smart warmup process monitors the sensor temperature and applies full sensor warmup only after the exhaust is heated sufficiently by the engine. This means that when exhaust is cold the sensor will become fully operational in 2-7minutes after engine is started.
- This feature is used by all OEM car manufacturers but neglected by the aftermarket.
- Smart warmup feature is disabled by default.
By integrating the CJ125 chip which is specifically designed by Bosch for their lambda sensors, faster response times and more accurate readings can be achieved. The kit also uses the best and newest lambda sensor technology LSU ADV which is the successor of LSU 4.9.
LDperformance wideband is the only aftermarket controller that uses Smart warmup function to avoid premature failure of the lambda sensor.
No user calibration is required for proper operation.
It is possible to reconfigure the controller for use with 4.9 sensor.
- Connect both 0-5V output and digital output wire to ground.
- Turn on controller for 3 seconds and turn off.
- Confirm the setting is changed by checking the initial reading on the display when initialising - 4.9 or ADV.
- Repeat the same process to switch back.