Logging with the AEM UEGO

[ljaviation]

I've asked this on the old Autronic website from Ray to no avail.
2003 WRX US spec WRX with PNP board.

I have the AEM being wired to the b17 pin as I/P 1 analog. The logged data and the AEM display never are close.
1) How can I log O2 data with this guage for some road tuning and it be relatively close.

2)The other thing I noticed is that with B17 enabled, my A/F changes as compared to when I disable it. I am running manual tune, so I don't know why it would chnage. Any advise?

3) Should I change it to the D29 pin O2 as signal input, and would that make a difference?
Thanks in advance
L J

[Wroom]

Are you using an SM4 based PNP unit?

What chip version do you have?

Can you upload the map, so we can have a look at how it is configured?

[ljaviation]

Yes it's the SM4 PNP unit, and I bought and installed the 1.06 chip from Ray.
I will have to upload my calfile afterwork.
Thank you for the quick response

[Ian]

I've asked this on the old Autronic website from Ray to no avail.
2003 WRX US spec WRX with PNP board.

I have the AEM being wired to the b17 pin as I/P 1 analog. The logged data and the AEM display never are close.
1) How can I log O2 data with this guage for some road tuning and it be relatively close.

2)The other thing I noticed is that with B17 enabled, my A/F changes as compared to when I disable it. I am running manual tune, so I don't know why it would chnage. Any advise?

3) Should I change it to the D29 pin O2 as signal input, and would that make a difference?
Thanks in advance
L J
A couple more questions for you;
1. What is the AEM output range of AFR's and what voltages correspond to these AFR's?
2. When you say you disable B17 what exactly do you mean? Are you disabling the Open Loop Table or just the Input?
3. Don't use D29 (E29 on newer looms) as an O2 input for an Analogue output from a AFR meter. The Subaru front A/F sensor is a 4 wire version of a 5 wire sensor and requires a special input which D29 is. Stay with B17 but is sounds like either or both of the AEM output and Autronic input are not calibrated for each other. To get them talking to each other should be possible without too much difficulty.

[ljaviation]

In the AEM manual, there is a voltage per A/F ratio table. I do not have it with me.
The back of the AEM A/F guage has a position that is supposed to be Autronic compatable. The AEM uses a Bosch 0-5 volt, 5 or 6 wire sensor.
When I disable B17, I mean only the input.
I have attached my calfile.
It drives very well, but I need more tuning on the high end.
I thank you all very much for any input.
L J

99

[RAC]

Most gauges that have an "Autronic compatabe" output setting have the 0-1volt output type.
That should still be able to work but needs setting up in the sm4 software.
The better way is to see if you can change the output of the wideband so 0v=10:1 and 5v=30:1 this would be done in the widebands software. Then you would set the sm4 software up to read it just like the Autronic wideband.

[Wroom]

Looking in your cal file, in the "I/P A/F Ratio" menu:

When selecting B17 as input i see that Linerarize is set to "Linearize 1".
It should be set to "Linear". Then the Span and Offset parameters will appear.

For a 0-1 Volt input, set to the following:Span = 500
Offset = 1000
For a 0-5 Volt input, set to the following:Span = 2500
Offset = 1000
Then adjust the Analyzer output to be Autronic compatible for either one or five volts.
That is probably the easiest way.

[ljaviation]

I will do so today, and post my results.
I thank you all for your input.
L J

[awdgsx92]

I have the AEM controller. Should I still run the normal o2 sensor on the 37 pin and then run the AEM as the secondary o2 on the 08 pin or the 38 pin? This is with an SM4.

[MRMRacing]

If you have a wideband controller why would you keep the regular O2?

[awdgsx92]

I tried it with the wideband hooked up instead, but it wouldn't run with it like that.

[MRMRacing]

What do you want to do with it ? Autotune, Log, run clc, Lean highway mode ?

[awdgsx92]

I would like to autotune. But I would settle for logging.

[MRMRacing]

Then you should use O2 input än coonect your wideband meter to that.

[Java]

Bringing back an old thread:

AEM UEGO guage.

According to the chart 0v=10:1, and 4.99V=19.98:1
I have the complete chart if I have to manually enter in the numbers but I am unsure which menu I use in the Autronic to set up a custom linear.

How do I set up the SM4 in order to use this for logging and a little bit of tuning?

I have left the switch on the guage to P0 so that I can use the 0-5v.

There is a setting, P3, that emulates an Autronic 0-1v. I would prefer not to use this.

Thank you,

Paul

[MRMRacing]

If you got a Sm4 or a SM4 based pnp you should set Span to 5000 and offset to start with 1000, adjust offset until it matches the meter.

[Java]

Thank you, much better now.

Is there a way to edit/make your own linear table in the SM4?

Paul

[MRMRacing]

Yes you use Linear and adjust span and offset.....

Do you mean for O2 or other functions?

[Java]

For O2 and logging.
I have the offset to where both guage and SM4 log are very close.

However, I was wondering if it was possible to copy the AEM coordinates (from the chart in the instructions) into a linear chart.

I understand the limitations of the AEM and I would not use it other than a rough tune or logging.


On another topic, what inputs/conditions does the SM4 use to determine if hwy lean mode (once it has been set up in the menu)?

Paul