FC Datalogit hookup

[apalmer]

Could anyone explain the best way to hook up the VEMS analogue output for lambda directly into datalogit for the PowrFC. Basically the aux in on datalogit needs a low voltage to afr calibration say 0v to 9 and a high calibration say 5v to 16. With Megatune I noticed that to calibrate you have various options, the one that suits the most is probably linear 0-5v, but this begs the question what AFR’s would it be reading at the low and high points so I can calibrate datalogit correctly. Option 4 could be used but could change the afr curve and give different readings to my logging software.

Did that make any sense?

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I never was able to understand what the 0-5v range offered, and never got a proper explanation:(
I would suggest that you use one of the linear scaled outputs:



And use 153 which is 3V/Lambda (Motec default).

[apalmer]

OK, unfortunately that doesn't really help me too much as the graph only shows one clear reference point at 3v for 1.4 lambda. From that graph would i assume the 2.4v would be 0.8 lambda?

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Yes 2.4V is 0.8L

Seems I've got the thing wrong  - 3V * L

3 * 0.7 = 2.1
3 * 0.8 = 2.4
3 * 0.9 = 2.7
3 * 1.0 = 3.0
3 * 1.1 = 3.3
...

[liquidsmoke]

http://www.sxoc.com/vbb/showthread.php?p=5394761#post5394761

Can it be hooked up in this manner instead, using linear 0-5v output?