Datalogging afrs using Greddy E01

[Tannhauser]

As far as I know, I should be able to do this - in as much as the wiring is in place for it. However, the manual tells me that I first have to enter a conversion factor for the input signal. I have the AEM wbo2 guage and sender.

 

Does this look correct:

 

Volts: 0-5

Range: 11.0 - 16.75 ?

 

Surely, it can't be that simple?

 

Other information:

 

As far as I can figure out from the documentation, the guage shows rich below 11.125 and lean above 16.625. There is also a table showing 'analog output voltage modes' for four different calibrations. P0 and P1 seem to be identical and run from 0.5V at 11.0 to 3.38 at 16.75, the others run between 1.1- 1.68, 0.05-0.34 and 0.9 -0.08. Needless to say, I don't know which mine is set to.

 

Any suggestions appreciated.

 

Cliff

[Tannhauser]

OK, I just tried it out using the 0-5v = 11.0 -16.75 conversion. There is a definite discrepancy between the AEM gauge and the figure showing on the E01 using this conversion, though it's hard to see a consistent pattern.

 

Any ideas?

[Chris Wilson]

You need top find out the voltages the sensor gives at certain mixture ratios, for example the Techedge kits sensor uses a conversion of 0 volts = 9 and 5 volts = 19 (9 and 15 being the A/F ratios).

[Guest Terry S]

Cliff firstly I read your mail then switched PC's and lost it, can you resend mate.

 

Secondly, Ian C and I listed all the AEM voltages Vs Values. Ian has them in excel form.

 

HTH

[SimonB]

Cliff, have a read of this thread. Basically the E01 can only cope with a linear input properly, as you can only put in the voltages and values at min and max. The AEM wideband has a non-linear output (there should be a graph of it in the instructions) so the best you can do is approximate it. If you look at my post in that thread there is a graph showing the output from the AEM wideband and a straight line which is the approximation. In the middle of the range it will be very close, at the top and bottom the errors are greater.

 

I have the WB without a display - I think the output is slightly different from the one you have.

[Tannhauser]

Thanks to one and all.

 

Simon, I'd forgotten about that thread; I should have gone for the FJO. Still, the AEM gauge has all those coloured LEDs so it's not all bad news.

 

Terry, I'll re-send that mail (and I'll ask Chis nicely for the excel spreadsheets).

 

Regards

 

Cliff