What makes PLX Wideband controllers better than the rest?
Tech Article: PLX Critical Response Wideband Technology
PLX Devices Inc. has carefully and meticulously designed the wideband
controller circuitry to maximize the oxygen sensor characteristics. Response
time, overshoot, settling time and steady state accuracy are key parameters
which define a wideband oxygen sensor control system. PLX Devices employs a
digital PID controller specially designed to maximize and to take advantage of
all these key parameters in both the Bosch and NTK wideband sensors.
Wideband oxygen sensor controllers require very precise electrical tolerances
to provide accurate steady state AFR readings (accuracy of your measured AFR).
PLX Devices puts a special emphasis on strict testing and quality assurance to
all of it's products ensuring that all electrical tolerances meet very stringent
specifications. Internal voltages which deviate as little as 50 mV can skew the AFR
readings more than 0.1AFR. All PLX widebands are measured and tested to
guarantee excellent accuracy and performance.
What's the difference between the NTK and the Bosch sensor?
Side by side comparison tests between the NTK and the Bosch sensor showed negligible differences and are almost identical in reaction time and accuracy. The main difference is the price. Bosch produces a much higher volume of wideband sensors than NTK. As a result, Bosch's sensor prices are slightly lower.
Does the M-250/M-300 come with the wideband oxygen sensor?
Yes, both the M-250 and M-300 kits come with the controller, sensor wire harness and the wideband oxygen sensor. The kit is complete and is everything you need to start measuring accurate air/fuel ratio.
Can the M-Series narrowband output be used to replace my stock oxygen sensor?
Yes, if your vehicle comes equipped with a standard narrowband oxygen sensor, you can use the narrowband output (gray wire) to feed that directly into your ECU. This eliminates the hassle of having to weld a second oxygen sensor bung onto your downpipe. PLXApp004 contains more details.
Does the M-Series wideband controllers work with my engine management system?
If your engine management system (stand alone or piggy back), is capable of a 0-5V input signal and your software is capable of defining the relationship between voltage and air/fuel ratio, the M-Series Controllers will be compatible with your setup. Check out our Application Notes page for more information. If you have a successful setup that we have not published yet, let us know about it!
I would like to weld another sensor bung on my downpipe. Where is a good location to mount the wideband sensor?
Anywhere before the catalytic converter and approximately 24 inches downstream from the engine block or turbo is a good location. The sensor element will fail if it is exposed to exhaust gas temperatures above 850 deg Celsius. Both the Bosch and NTK sensor fit into 18 x 1.5mm thread.
Can I run the wideband setup all the time in my vehicle or am I only limited to using it during tuning?
Yes, you can install the M-Series controllers permanently in your vehicle if you wish. It was designed to be a self contained unit small enough for non intrusive dash mounts. Its size is no larger than a typical radar detector. 4.5 X 2.625 X 0.9 inches (L x W x H).
Can I use the narrowband and linear wideband outputs from the M-Series controller at the same time?
Yes! Both narrowband (gray wire) and linear wideband (white wire) can be utilized at the same time. They are completely independent signals from each other.
What types of signals can the M-400/M-500 data log?
The M-400/M-500 accepts two types of signal for data logging.
1. 2 Speed (Measures the frequency of signal pulses)
2. 4 Analog (Measures the voltage of a signal)
A compatible speed input is defined as an oscillating pulse which switches between a high voltage and a low voltage. A valid high voltage is 2V-25V with respect to ground (black wire) and a valid low voltage is 0-0.8V with respect to ground (black wire).
A compatible analog input is defined as a voltage between 0-5V with respect to ground (black wire). Any voltage between 5-25V will be capped to 5V and above 25V will cause damage to the logger.
M-400/M-500 data logger is NOT vehicle specific and was designed to be compatible with most signals to and from you ECU, but not all of them. It is up to the user to determine the viability and compatibility with the intended vehicle to be used based on the descriptions above.
I lost my capacitors. What are the specifications of the included noise filtering capacitors?
The noise filtering capacitors are standard 0.1uF 50V capacitors. They can be picked up from your local electronics store. Radio Shack also has them.
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