if you're interested in using your v4 AUX input for
Wideband logging there are a few things you have to do before hand:
1. most
wideband systems out on the market (AEM uego, Innovate, Zeitronix, etc...) output a 0-5v signal. in order for your v4 MJLJ's Aux input to read the 5v input signal you'll have to perform a slight modification to the board that
brentp has described already
here towards the near bottom of the page.
a visual for those already familiar with the instructions.
* for v3 owners you'll need to update your firmware to v3.3.0 (currently in Beta) and download the latest v3 configurator software (also in Beta), and fab a secondary board for the aux interface. read more about it
here.
2. afterwards, you'll need to provide the MJ with the appropriate calibration info in order to output the correct visual data. i've already done the math and outputted the data to 2 separate .txt files. the first is the spread just so you can see the voltage intervals from 0-255. the second .txt is the actual file you can upload to your MJ as the calibration file which i've gone through and rounded up the measurments to whole numbers and no more than 3 places. you can change the calib. file to your liking by using the spread.txt file as a reference.
3. and according to your brand of
wideband O2, make the necessary ground and +12v connections and most importantly the 5v output connection from your WB to the MJ's aux input.
*reminder, if you haven't already done so be sure to perform a free air calibration on your O2 before putting in place. just follow the manufacturer's instructions on how to do so.
another side note, you'll get a more accurate reading with the WB O2 in the collector than from the tailpipe. at the tailpipe, there's too much available free air that can provide a leaner reading than if you were taking your reading from the collector. i take mine from the tailpipe inspite of the afore mentioned "fact". i run a narrowband simultaneously for comparison since i never leave my WB in for permanent use.
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