aem wideband is CRAP - Miata Turbo Forum - Boost cars, acquire cats.

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Old 01-14-2015, 08:22 AM   #1
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Default aem wideband is CRAP

So who uses one. First thing I noticed when I got it out of the box it the analogue gauge is cheap plasticky and slightly bigger diameter then specified (needed to get a file in and open up the hole I'd drilled for it that the other two gauges dropped into). No biggie.

The thing that really pisses me off though is that the connectors on the gauge would be sub par on a PC let alone anything that vibrates. The small connector falls out of the gauge if you look at it wrong and not only kills power to the gauge but also the whole controller so your ecu loses the signal too. Depending on where you mount the gauge it can be a real bastard to get back in.

Right that's me done venting (I've already thrown some tools around the garage). Solutions wise would it be worth trying to get the back off the gauge and solder all the connections straight to the pins or is that going to be more trouble then its worth? Actually I've got a mate with an innovate controller not in use I might try to persuade him to part with it.

Lastly in AEMs defence when it works it seems to work pretty well and it fires up and gives a reading bloody quick.
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Old 01-14-2015, 09:00 AM   #2
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Yeah the connectors suck dick.
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Old 01-14-2015, 10:00 AM   #3
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I've used literally dozens of AEM's and the only ones with loose connectors were damaged. All others were actually really tight and needed convincing to come out.

They're made in china now iirc, so I'm not too surprised at the lacking QC. They work tho, so there's that.
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Old 01-14-2015, 10:22 AM   #4
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I had a AEM UEGO digital wideband gauge in my NB1 and had not complaints or any of the issues you describe and have another one waiting to be installed on my NA.
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Old 01-14-2015, 11:22 AM   #5
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I dislike that what the gauge reads is off verse what TS gets in for its AFR value. I have played with voltages a bit using the settings from 18PSI, but TS still reads my tune as .3-.5afr leaner then it actually is. Overall I think it is a wash between the AEM and the MXT-L. For my next one it will be whichever is cheapest.
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Old 01-14-2015, 12:00 PM   #6
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I am reading about the the new 14point7 wideband. I don't like that it doesn't have a traditional gauge for mounting purposes but supposedly it is the most accurate one out there. Sigma Lambda Controller Pure Plus 2 | 14Point7

Also, by hand tweaking my settings I have gotten my AEM Uego to match from gauge to megasquirt by no more than point one.

I am seriously looking at the 14point7 "iDash" without gauge for my next wideband. It is about $100 more than the UEGO and has accelerometers and all kinds of other cool inputs you can run into the megasquirt. It also interfaces with your iphone or android... iDash | 14Point7
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Old 01-14-2015, 01:03 PM   #7
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All of my AEM's work fantastic, no issue with connectors. I dont have the WB though so it could just be that.
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Old 01-14-2015, 01:06 PM   #8
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I've also never once had an issue with an AEM wideband connector.
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Old 01-14-2015, 01:10 PM   #9
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Solid motor mounts, solid diff mounts, zero compliance bushings and a BP motor. Read it will vibrate the teeth out of your skull......but not the connector off the AEM wbo2 gauge. You must have received a bad one.
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Old 01-14-2015, 01:26 PM   #10
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Connector sucks bad on my coolant temp gauge.
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Old 01-14-2015, 01:29 PM   #11
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AEM UEGO working fine here...
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Old 01-14-2015, 01:45 PM   #12
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I've seen a few with connectors that were loose right out of the box. After plugging them in, I just held the wiring harness down on the back of the gauge, and glued it to the back of the gauge with something like Shoe Goo.

It works to hold the wires still, and doesn't give them enough slack to wiggle out of the connectors anymore.

Ghetto? Sure. Holds up to racing levels of vibrations/bumping/off-road excursions? Yes.
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Old 01-14-2015, 01:57 PM   #13
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Quote:
Originally Posted by Chiburbian View Post
I am reading about the the new 14point7 wideband. I don't like that it doesn't have a traditional gauge for mounting purposes but supposedly it is the most accurate one out there. Sigma Lambda Controller Pure Plus 2 | 14Point7

Also, by hand tweaking my settings I have gotten my AEM Uego to match from gauge to megasquirt by no more than point one.

I am seriously looking at the 14point7 "iDash" without gauge for my next wideband. It is about $100 more than the UEGO and has accelerometers and all kinds of other cool inputs you can run into the megasquirt. It also interfaces with your iphone or android... iDash | 14Point7
None of the consumer grade widebands are any more accurate then any other ones. Bowling and Grippo (people who made MS) had a very good talk about wide bands a few years ago at a MegaMeet. They went in to all sorts of technical details to explain why they were all "crappy" and not the most accurate. Most of it was over my head, the important part that I do remember is that all consumer grade ones are about the same, so whatever one is cheapest that you like is what you should go with.
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Old 01-14-2015, 02:19 PM   #14
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Quote:
Originally Posted by shuiend View Post
None of the consumer grade widebands are any more accurate then any other ones. Bowling and Grippo (people who made MS) had a very good talk about wide bands a few years ago at a MegaMeet. They went in to all sorts of technical details to explain why they were all "crappy" and not the most accurate. Most of it was over my head, the important part that I do remember is that all consumer grade ones are about the same, so whatever one is cheapest that you like is what you should go with.
Except for the NGK AFX, the holy grail of widebands?
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Old 01-14-2015, 02:23 PM   #15
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Quote:
Originally Posted by 18psi View Post
I've used literally dozens of AEM's and the only ones with loose connectors were damaged. All others were actually really tight and needed convincing to come out.

They're made in china now iirc, so I'm not too surprised at the lacking QC. They work tho, so there's that.
any idea on when they switched production? i got a aem wideband from 2012, works fine for me.
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Old 01-14-2015, 04:55 PM   #16
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The new AEM units use the revised LSU 4.9 sensors rather than the older 4.2. I'm not sure what model you have but the 4.9 are supposed to be improved in many ways. I read a tech article a while back but forgot the details.

Either way, another happy AEM wideband user here with no issues.

EDIT: Found it

http://www.ecotrons.com/technology/b...su_42_sensors/
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Old 01-14-2015, 08:54 PM   #17
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Quote:
Originally Posted by shuiend View Post
I have played with voltages a bit using the settings from 18PSI, but TS still reads my tune as .3-.5afr leaner then it actually is.
Not sure how yours is configured, but I've got mine to be within .1 difference between TS and the AEM gauge

I've got the power tapped into 1B, ground tapped into 2A, and sensor wire tapped into 2N on the ECU harness of my '94.

TS is configured to use a Custom Linear WB with the following values:
Point 1: 0.00v = 10 AFR
Point 2: 4.99v = 19.40 AFR

It took a bit of testing and trial/error but other than the response time in TS being much slower that the gauge reads, I'd say 70% of the time the AFR values match, and the other 30% of the time they're off by .1.

AEM is .1 richer than TS, IIRC.

Pretty sure I still have my testing notes around here as well.. if you're interested in them?

Just let me know and I can provide more info for you?
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Old 01-14-2015, 09:32 PM   #18
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I've never had a problem with the connector on my uego 4110
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Old 01-14-2015, 10:29 PM   #19
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Get some tape on that connector.
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Old 01-15-2015, 12:10 AM   #20
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calibrating the gauge to TS really isn't difficult and I've come to the conclusion that there isn't any 1 set of universal values to use. Just adjust until it's perfect. it's linear
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