Tech Edge now offers three low cost wideband oxygen content (or Lambda) sensing units, in DIY (Do It Yourself) and prebuilt form. There's the :
They all offer a high performance but low cost means to accurately monitor the AFR (Air Fuel Ratio) of your vehicle. You can add our small low cost TE-5301 LED display for continuous AFR (or Lambda) readout. An L1H1 NTK UEGO sensor (supplied by you, and obtainable from a number of outlets) is also required and an interface cable completes the setup. You can order items described above or follow the links for more information.
TE-WB Wideband Unit (Vers 1.5)
The newest (version 1.5) unit offers the following improvements over version 1.0 :
TE-WB Wideband Unit (Vers 1.1)
Note : The version 1.0 has been discontinued and replaced with the version 1.1 which is the 1.5 unit without the logger function.
Oz DIY-WB (Vers 1.0) Discontinued
The original DIY-WB version (vers 1.0) unit is currently in use by thousands. It has been replaced by the 1.1 unit, but still has these features :
TE-5301 Wideband LED Display
The TE-5301 display interprets the WB unit's raw Vout signal and produces a 3 digit AFR display. It can be modified internally to display Lambda. It features :
The TE-5301 unit is available as a prebuilt unit (order it here) or as a DIY Kit. We are working on the next version of this display to support some of the features added with the TE-WB (v1.5), and continuing with 2.0.
We also have a number of supporting items available.
Printed Circuit (PCB)
As well as parts kits for the version 1.1 and 1.5 wideband units, we make the PCBs individually available. (We may still have some version 1.0 PCBs available)
The Wideband units described here are not an adapter for an existing oxygen sensor you may already have, but a conversion using a specific five wire NTK UEGO sensor and a box of electronics that interfaces to the sensor. This NTK sensor is designed specifically to measure both rich and lean, and is ideal for tuning your EFI or carby vehicle (note however that leaded fuels will dramatically reduce the life of the sensor). Here is more technical information on the L1H1 sensor.
Most people using the 1.0 WB interface unit will mount the new sensor alongside their existing narrow band sensor, or perhaps in a more convenient position before the catalytic converter. The version 1.5 WB unit has a narrowband output and, with care, it can replace the existing narrowband sensor you may have, but note that you run the risk of damage to your vehicle if you run very rich or very lean mixtures for extended periods of time, or for very short period of time on forced induction motors, incorrect mixtures can rapidly cause damage.
The wideband sensor must be carefully placed in order to prevent damage to the sensor itself and to maximise accuracy. Also, if you use the sensor's output directly (via the simulated narrowband output) to drive your ECU then you should be doubly careful. Please follow all of these "rules" :
The sensor reads the partial pressure of gases in the exhaust and infers the AFR, rather than by measuring some magical AFR directly. This may be an issue on forced induction, and in particular, on turbo-charged engines.
A solution is to ensure you locate your sensor away from the turbo, and certainly on the exhaust (low pressure) side of the turbo rather than the engine side.
There are a number of software projects that will let you log the output of the version 1.0/1.1 or 1.5 wideband units.
We hope to have links soon for Win32 and perhaps WinCE applications.
We are developing a logger that can work with the version 1.0 DIY-WB unit. It can also work as a stand alone logger for other similar logging tasks. At present you can log the 5301's data using software from Jonathan Burchmore.
We appreciate your feedback on the content and any corrections necessary to this article.
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