AEM Wideband O2 gauges

[DaveMcKenz]

Originally Posted by david.avrahami@

Dave,
which wire (color) or? do you plug the WHITE wire coming from the AEM GAUGE?

Yes. The white wire runs from the gauge back to the O2 sensor connector in the engine compartment.
There may be a shorter route tapping into the DME, but that's not what I did.
Dave

[david.avrahami@]

Dave....I do not quite understand....let me ask again....in your original answer to me (#59) you say that i can put a bullet crimp on the white wire and connect it to the OLD DME CONNECTOR...
My question is : which wire in the DME CONNECTOR DO I PLUG THE WHITE WIRE COMING FROM THE AEM GAUGE? Can you identify it by colour or # ?
Thanks

[scarceller]

The white wire needs to be connected to pin #24 at the DME
Or simply route it back to the engine bay and connect it to the original signal line that had the original O2 sensor on it. The wire should be green.

[DaveMcKenz]

Sorry, I was unclear. This is what I did:
When I ran my cable from gauge to the engine compartment, I included an extension of the gauge's white wire. I put a bullet connector on that and ran it to the connector where the original O2 sensor signal wire previously was connected. This is located near the ignition coil. The old O2 sensor is removed, and the new WB sensor is put in its place. The WB sensor signal goes back to the gauge (along with the white wire, which is bringing the simulated NB signal back to the engine connector).
Good luck, and I hope this helps,
Dave

[david.avrahami@]

Thanks to both of you....I get it now...

[david.avrahami@]

My understanding is that I need to set my AEM 30-4110 to position #4 or as shown in the manual P4...
My question is : by rotating the dial in the back of the gauge, do I move clock wise four positions? how do you verify that you are in P4?

[scarceller]

You can double check pos 4 by measuring voltage at the white wire. It should not be higher than 1vdc and if the gauge is reading 14.7AFR the white wire voltage should be about 0.5vdc

Originally Posted by david.avrahami@

My understanding is that I need to set my AEM 30-4110 to position #4 or as shown in the manual P4...
My question is : by rotating the dial in the back of the gauge, do I move clock wise four positions? how do you verify that you are in P4?

[david.avrahami@]

Thanks Sal, I understand that you might be using this particular gauge, but i would like to set it up first in P4 position and the manual does not specify that...DO I GO CLOCKWISE ALL THE WAY TO REACH IT OR? I am afraid that setting it in a different postion might damage the gauge once the power is on.

[RD911T]

I think it will help:[IMG][/IMG]
Sorry it's upside down, but you get the drift.

[david.avrahami@]

thanks ...but do I turn the rotor clockwise as far as possible to get there?

[DaveMcKenz]

Originally Posted by david.avrahami@

thanks ...but do I turn the rotor clockwise as far as possible to get there?

Yes. You can also turn it back and forth to get a feel for the switch. Count the clicks if you want. Ultimately it looks like you will go fully clockwise.
Good luck,
Dave

[david.avrahami@]

Thanks Dave & Sal, I am almost there...just replacing the sensor and inserting to the old connector.
Hope it will all work...lots of bending and shoving, hard on the knees and hand muscles for a 72 years old porsche buff...

[DaveMcKenz]

Originally Posted by david.avrahami@

Thanks Dave & Sal, I am almost there...just replacing the sensor and inserting to the old connector.
Hope it will all work...lots of bending and shoving, hard on the knees and hand muscles for a 72 years old porsche buff...

Good luck. I'm 67 and I hope I'll still be bending and reaching in 5 years.
Dave

[Lake Guy]

I'm just wiring up my AEM 30-5130 gauge and it also has a brown wire labelled analog. In the instructions it says to wire the white and brown wires to a data logger. So now I'm confused. Should I be taking the white wire back to the old O2 sensor green as mentioned above (is that the Lambda + input)? If yes then what about the brown wire? The instructions say it must be used if the white is used. Ideally this brown would be connected to the Lambda - input if there is one or to a sensor ground if no - input or finally to a chassis ground if none of the other two exist. Who can help answer my concerns?

http://aemelectronics.com/files/instructions/30-5130%20Analog%20Wideband%20UEGO%20Gauge%20Gasoline %20AFR.pdf

Thanks, Mark.

[DaveMcKenz]

Hi Mark,
You don't need to hook up either the white or the brown wires. The car will run open loop and be OK. You can watch the air fuel ratio on your new gauge. If you want to feed a simulated narrow band signal to your car's brain so it can try to adjust its mixture, just connect the white wire to the place where you disconnected your old O2 sensor. You can watch how it controls air and fuel. I have no experience with data logging, but I think the brown wire provides a ground for that purpose only.
Good luck,
Dave

[Lake Guy]

Thanks for the help Dave, I've pulled two spares to the back for the white and brown and then tied them off. I guess when I get the new sensor installed I'll connect the white and see how it goes.

I've read that using these gauges without a data logger is kind of tough to get any real information. Sounds like it's hard to record/remember much while driving. I'll be working with Sal when the car is back on the road in preparation for his injector and DME upgrades. If there are some wiring points to adjust at that time I'll be fine - there's enough wire run.

I have to say, tearing apart the front suspension is more fun than running wires.

Mark.

[scarceller]

Mark,

If you DO NOT have a cat converter then no need to feed anything back to the DME. Without the cat converter it's best to run the DME in Open-Loop mode just like the Euro engines.

Also, for initial data gathering you do NOT want the O2 closed-loop feedback trying to influence the mixture. If you review my data gathering sheet it specifically says you must gather AFR numbers without O2 feedback.

You also do not need recording ability to gather the basic AFR numbers, it can be done by just looking at the gauge quickly or having a passenger look at the gauge while you drive under the conditions for the test case.

Originally Posted by Lake Guy

Thanks for the help Dave, I've pulled two spares to the back for the white and brown and then tied them off. I guess when I get the new sensor installed I'll connect the white and see how it goes.

I've read that using these gauges without a data logger is kind of tough to get any real information. Sounds like it's hard to record/remember much while driving. I'll be working with Sal when the car is back on the road in preparation for his injector and DME upgrades. If there are some wiring points to adjust at that time I'll be fine - there's enough wire run.

I have to say, tearing apart the front suspension is more fun than running wires.

Mark.

[scarceller]

Mark,

The AEM gauge you bought 30-5130 does not have the ability to simulate a Narrow Band Sensor. That particular gauge does have a white output but it is not configurable, it's output is 0-5vdc and is NOT able to simulate the 0-1vdc narrow band signal. This gauge also uses the older LSU 4.2 sensor not the LSU 4.9. It's a decent gauge but the other AEM 30-4110 is the more modern slightly better gauge.

The AEM 30-4110 has a programmable white wire output that CAN be set to mimic a narrow band 0-1vdc output. This gauge also uses the most modern LSU 4.9 sensor. It's simply the very latest technology gauge from AEM but the face is digital (not analog) I wish they made this same gauge in analog.

Bottom line: the AEM 30-5130 is a decent gauge but CAN NOT be wired to the DME, do not bother trying to wire it up as it will only make your DME think the motor is rich at all times and the DME will get confused and lean the mixture. Again, DO NOT tie that white wire to the original O2 harness! If you send a voltage above 0.7vdc back to the DME it will tell the DME motor is RICH!

I did not realize what AEM you bought, most folks use the other 30-4110 unit.

Originally Posted by Lake Guy

I'm just wiring up my AEM 30-5130 gauge and it also has a brown wire labelled analog. In the instructions it says to wire the white and brown wires to a data logger. So now I'm confused. Should I be taking the white wire back to the old O2 sensor green as mentioned above (is that the Lambda + input)? If yes then what about the brown wire? The instructions say it must be used if the white is used. Ideally this brown would be connected to the Lambda - input if there is one or to a sensor ground if no - input or finally to a chassis ground if none of the other two exist. Who can help answer my concerns?

http://aemelectronics.com/files/instructions/30-5130%20Analog%20Wideband%20UEGO%20Gauge%20Gasoline %20AFR.pdf

Thanks, Mark.

[Lake Guy]

Well I'm glad we cleared that up Sal. Thanks for the info. There is so much info floating around on this work it's sometimes confusing (as anyone can sees from my questions). Thankfully this forum has knowledgeable people willing to share.

Yes I specifically did not want the digital gauge so this AEM 30-5130 was my selected option. I'm sure some other people have done the same for that reason. Hopefully everyone is clear now.

Thanks again for the help, Mark

[DaveMcKenz]

Thanks, Sal. I did not see that his gauge does not provide 0-1V simulated NB signal.
Dave