Description
The first round of controllers + gauges have sold out. New inventory expected by late Jan/early Feb.
Wideband controllers, without a gauge are still in stock.
This wideband controller requires no custom wiring! It simply plugs into the factory rear (or front) oxygen sensor connector. The controller will receive power directly from the ECU via the oxygen sensor pre-heater circuitry. The ECU will also receive the measured air to fuel ratio via the oxygen sensor signal input channel.
This controller comes with a genuine Bosch LSU4.9 sensor and an optional wireless display. The wireless display has a high contrast 2.3″ x 1.8″ AMOLED touch screen and is powered via USB-C. For those who don’t want to have the display visible all the time, the controller will continue to function even when the display is turned off or unplugged. Adding a display to a controller originally purchased without a display is not possible.
A demo of the screen can be seen here: https://youtube.com/shorts/r884OhlGlmk
For those who order the controller with a display, a MAP sensor capable of measuring from vacuum to 58PSI absolute (~44psi gauge) of boost pressure will be included. A vacuum line will need to be connected to the barb on the side of the controller enclosure. The display can be switched from displaying boost to AFR by tapping on the touch screen. A resettable peak hold feature will record the maximum boost pressure since the controller was powered on. The controller will only use the MAP sensor signal for output to the display.
Since the wideband sensor’s power is controlled by the ECU, the sensor will only start pre-heating after the engine has started. This prevents the most common failure mode of aftermarket installed wideband sensors – thermal shock of the ceramic sensing element. If a wideband sensor is pre-heated prior to engine start, cold water from the engine will hit the hot sensor and over time, cause the sensing element to crack. When an aftermarket wideband controller is installed, the controller receives power as soon as the key is turned to POSII. This means that the sensor is always heated, at least somewhat, before engine start.
This controller uses an extremely accurate and robust all digital control strategy, with a very fast response time of 10ms. The power and analog output ground are separated and since the analog ground is fed directly to the ECU, the signal that the ECU receives is extremely accurate and noise free. For those running wideband lambda control, this means you get the highest amount of accuracy possible.
In order for this controller to be plug and play using the stock oxygen sensor connector, a modified tune must be flashed to the ECU and a single ECU pin bridged internally. The tune modification reconfigures the oxygen sensor pre-heater code so that the controller will receive power only while the engine is running. The solder bridge connects the oxygen sensor signal ground pin to common sensor ground. For those who already have a tune from us, we will modify your tune to suit and modify your ECU, if ordered at the same time as a tune. If you’re tuning the car yourself or have someone else tuning the car, we will provide a tune patch free of charge.
For those who wish to use this gauge without connecting to the Volvo narrowband oxygen sensor connector, we can provide the controller without the connector. You will just have to connect at least 3 wires (connection of the analog output is optional). The controller has an option for ‘smart’ warmup, where the sensor will not start pre-heating until after the sensor temperature exceeds 350ºC. This is useful if the controller’s power isn’t controlled directly by the ECU.
When this controller is used along with wideband lambda control, it will completely replace the stock front oxygen sensor. While this controller comes with a rear oxygen sensor connector, it can be plugged into the front oxygen sensor connector by simply cutting the ‘key’ on the side of the connector.
You can read more about wideband lambda control here.
