Wideband and resistance

Maxbou92 wrote:

Hello everyone, simple question for you all !! I have stock Coil and Ton’s wire 0ohm with 1kw NGK cap and B8es plugs .. Do my AEM  AFR gauge gonna give me trouble if I dont have at least 5kw resistance? False reading? 
thank you and Merry Christmas 🌲🙂

Maxbou92 wrote:

Ok!! So it can « flicker » and show different numbers at the same time?

Maxbou92 wrote:

Aem wideband!! My spark is supposed to be « better » with 1000ohms and no resistor wires? I had resistor wires and 5000ohm cap before!!

bry195 wrote:

if you tried your hardest you probably couldn’t introduce electrical noise into the system - There is a reason why the likes of "Motogadget" and Axel Joost" tell you to mount control units away from HT sources ? unsurpressed ignition does create interference to varying degrees.. The measurements come from current not voltage. - Wideband relies on both voltage and current - the voltage gives a measurement and the current value required to produce the required voltage reading is measured by the ECU (see below)  The ground is not a real ground it’s a virtual ground. The wiring is twisted pair which means any noise that is picked up will be picked up by signal and ground. That cancels noise because the measurement is the difference between signal and ground. if they both rise then its canceled out. I have never seen a twisted pair on a lambda sensor (shielded yes) twisted pairs are normally used for "can-bus" data transfer (to the best of my knowledge)

• Do I get extra credit because I work for Bosch? I’m just kidding, I really dont have a deep need to be right but it would be good to know if I am wrong considering how many standalone and integrated sensors ive used. A non-wideband is a voltage outputting sensor for sure. I know this first hand from using a meter to tune bikes before wideband came out. I believe AEM (wideband) still uses the LSU 4.9 from Bosch with built in signal conditioning (built into gauge). There is an analog output (voltage) and serial for use by an aftermarket engine control unit. That analog is not shielded but its also mounted somewhere near the dash. 
• 
  From the highlighted text

  “The amount of current required to maintain a specific oxygen level indicates the air fuel ratio.”

  That sentence is the entire proof.
• Measured Nernst voltage
• Drives pump current to null error
• Reads the required current
• Converts current → lambda
• If you connect a wideband sensor to a voltmeter:
• You get a flat ~450 mV
• No AFR information exists
• The voltage is not the measurement
• The voltage is clamped
• The voltage contains no AFR information once regulated
• 
  
  
  A wideband oxygen sensor is a current-mode electrochemical transducer in which lambda is encoded in the pump cell current required to maintain a fixed Nernst cell voltage.
  
  and the Bosch block diagram supports it.
  
  
  
  I think that depending on where you look and which sensor/controller, you could find an analog signal that is scaled to AFR but the only signal that should be in proximity to the ignition system comes from the current in the controller. voltage is fixed before the conditioner. Thats why they need calibration. After the signal conditioner some controller have an analog voltage signal. If its referenced to ground and near the ignition system you should use noise mitigation techniques but the conditioner is usually at least 6 foot away from the sensor. Maybe there are more that arent twisted pair than are but I dont think its really relevant other than just discussion and half of the readers are technically lost and just trying to decide who is the idiot, LOL. Im not implying anyone is ann idiot but we both know that you would have the most social support.
  
  Anything that uses a virtual ground or differential measurement benefits from twisted pair and I have seen it, if its interesting maybe i can find something for you. Analog voltage speaker outputs or current driven ethernet communications (current driven like CAN) are both differential and twisted pair.  I do have a bias against “noise though”. Ive literally had at least 500 people tell me there problems must be from noise and so I have had to scope all of these problems just to put someone mind at ease and maybe 10 times noise was present and 2 times it caused a problem. You really have to do things the wrong way to get noise that is a problem. Just watch wire routing and grounds.
  
  I hold nothing for or against expertise or experts other than I treat them the way i like to be treated. Most people do not assume someone posting on a forum could be an expert but the content of what someone is saying should be evaluated on its own. None of what i have said is intended to be a knock on you. It’s just my perspective that may be wrong but I share what I know. Ive already conceded you are at least partially right.