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View Full Version : AEM wideband gauge

Koolsilver
02-06-2011, 11:51 PM
When I bought my car the previous owner included an AEM wideband gauge, I have pretty much been using it to look at the numbers mindlessly not knowing at all what they mean. I've tried to learn about them but with no real luck, so pretty much I'm looking for a breakdown of what these numbers mean. My numbers will range wildly from 13-15 but mostly stay around 14.6 is this normal? I have heard of the terms lean and rich and it can be bad to go too far either way. My car is 6-speed GTS, N/A stock ECU just basic mods I/E and random other minor things. So any basic explanation would be great.
gts_02
02-07-2011, 12:10 AM
Wideband measures your exhaust gases. Tells you if you're running too lean or too rich. widebands are usually used with turbo cars.
GSBoek
02-07-2011, 02:29 AM
The numbers show the air/fuel ratio. The numbers you are seeing are normal for a stock ECU. When you go WOT at high rpm they should drop into the 12-11 range meaning running rich, as the ECU sends a lot of fuel by default. Here's graph on a stock ECU:

http://www.newcelica.org/photopost/data/500/Dyno_base_AFR.jpg
Koolsilver
02-07-2011, 01:34 PM
Thanks for the graph and explanation so just to check when idle I get 14.6-14.9 while driving it's all over the place no consistency at all doesn't stay on the same number at all is this normal? And like you said in lift it's at 12ish. I'm just checking all this to maybe explain bad mpg I'm getting.
themuffinman
02-07-2011, 02:28 PM
It's suppose to bounce everywhere when on the throttle. just not insanely. Ideal is for it to stay Stoch. which is mid way between lean and rich. It will move around because the engine is always compensating fuel flow for air flow.Especially with our VVTI
GSBoek
02-07-2011, 02:32 PM
As long as the variation doesn't go out of range (about 17 max and 10 min) you'll be fine. Remember that the graph I gave is a dyno pull so the car is at WOT and thus in open loop. During normal driving the ECU runs mostly in closed loop so it's constantly adjusting AFRs based on what the sensors send as information. Try cleaning the MAF sensor and see if that helps.
1fastae101
02-07-2011, 04:26 PM
to me it seems like ur ecu is doing its job right
Koolsilver
02-07-2011, 07:04 PM
Ok great thanks for info I did clean my maf I think I'm gonna change u2 sensors soon
mad.mdx
02-07-2011, 08:31 PM
why the hell did he give you a wideband lol.
themuffinman
02-07-2011, 08:49 PM
why the hell did he give you a wideband lol.

Pretty sure our 02's are heated and wideband.
Smaay
02-07-2011, 09:15 PM
Pretty sure our 02's are heated and wideband.

im pretty sure you are WRONG again! this is getting to be out of hand, im gonna slap your wrist!
themuffinman
02-07-2011, 09:27 PM
WRONG again!

Again? I mean, I know I'm not always right, but what was I wrong about before?
1fastae101
02-08-2011, 02:23 AM
as far as i know theres no toyota that comes with a factory
o2 sensor, heated yea wideband No...
Smaay
02-09-2011, 05:02 PM
as far as i know theres no toyota that comes with a factory
o2 sensor, heated yea wideband No...

you are correct