Gastester

Wide band oxygen sensors, such as the Bosch LSU 4.2, utilize a more sophisticated sensing element which enable it to produce precise voltage output in proportion to the air/fuel ratio (see Fig 2.) As a result a wide band sensor can measure accurately from as rich as 9.0:1 to as lean as free air.

O2 Sensors - Wide vs. Narrow
Standard "narrow band" O2 sensors operate between 0 and 1 volts, and are only capable of accurately measuring a stoichiometric air/fuel ratio (e.g. 14.7:1). A richer or leaner condition results in an abrupt voltage change (see Fig 1.) and thus is only useful for qualitative determination. Modern automobiles use this "switch" like sensing at idle and part throttle to make small compensations in fuel delivery to keep the air/fuel ratio near 14.7:1.

If you don't have a access to a dyno or don't want to pay for dyno time you can use a wideband O2 sensor to measure air fuel ratio from the tail pipe or mount the sensor in an exhaust pipe. The innovative tail pipe adapter lets you mount the sensor in the tail pipe without worry about water damage or air sucked back into the tail pipe (causing erroneous AFR readings).

Bosch LSU Wideband O2 Sensor

Bosch Technical Information

Replacing a narrow band O2 sensor with a wideband sensor

Available Models

	2A0	2E0	3B1
Air Fuel Ratio Measurement	Yes	Yes	Yes
RPM Input	Yes	Yes	Yes
Internal Data Logging	Yes 32K	No	Yes 1 Meg
Integrated Display	No	Yes	No
Logging to PC	Yes	Yes	Yes
Analog Channels	3 Channels	2	0
Thermocouple Input	3 Channels	0	0
Narrowband Replacement	Yes	Yes	Yes
Logging Software	$20	$20	$20
Wideband Sensor	Bosch	Bosch	Bosch
Price with cables and sensor	$399.95	$349.95	$349.95

Display Unit LD02

Intelligent Display Unit LA1

Program the LA1 for numeric or text display.

To download the latest software, click here for Justin Luton's TEWBLOG (2.1 rev-b) utility (in ZIP format).

The 2.1b User's Guide describes in detail how to use the Raptor 2E0 dyno software. Click here for the TEWBLOG User's manual (2.1b).

Large, easy to read gauges that display the data in real time.

A running graph that plots the history of the gauges as the car is running. This makes it simple to look back in time a few seconds as you are driving.

Completely configurable "gauges". Each of the gauges can be configured to display the data from most types of sensor that can be connected to the Raptor.

Configurable real time graphs. Each of the graphs can be configured to display the data how you like it to be displayed.

Time stamped data (Accurate to 10ms)

Data is stored in a simple CSV (comma separated value) for easy import into other applications for analysis.

Wideband Sensor Positioning

The wideband sensor must be carefully placed in order to prevent damage to the sensor itself and to maximize 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 should always be placed on the engine side of a catalytic converter, unless you are testing the effectiveness of the converter itself.
The gas temperature to the sensor should never exceed 850 degrees C (about 1560 degrees Fahrenheit).
The sensor should never be run without power to the WideBand unit (a hot sensor burns off carbon residues)
Always have the long axis of the sensor perpendicular to the gas flow (stops sensor clogging)
Installation angle should be inclined at least 10° towards horizontal (electrical connection upwards) thus preventing the collection of liquids between sensor housing and sensor element during the cold start phase.

Tail Pipe Adapter

Prices subject to change without notice John Abbott

Copyright 2007 by Auto Expert Products Inc. John Abbott
Headquarters: 2574 nw 29th Drive, Boca Raton FL 33434
1 800 795-6958

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