Oxygen sensor extension

[xXxFLiPKiDxXx]

How would i be able to extend my header's oxygen sensor?
What kind of wire should i use?
Connectors?
Insulation or protection from engine heat?

Thank you in advance

[drift]

Originally posted by xXxFLiPKiDxXx
How would i be able to extend my header's oxygen sensor?
What kind of wire should i use?
Connectors?
Insulation or protection from engine heat?

Thank you in advance

you cant just extend the wires. the additional resistance caused by lengthening the leads could alter the sensor signal, providing false readings.

[fjt]

Originally posted by drift




you cant just extend the wires. the additional resistance caused by lengthening the leads could alter the sensor signal, providing false readings.

Are you serious????? Mines where extended.Is it bad idea????

[igo4bmx]

Originally posted by drift




you cant just extend the wires. the additional resistance caused by lengthening the leads could alter the sensor signal, providing false readings.

I'm getting an A/F gauge and need to tap into the O2 wires. will that affect the senors, since i will be connecting them in parrallel?

[j.fuggi]

just connect it to your ecu instead. easier...

[drift]

Originally posted by igo4bmx


I'm getting an A/F gauge and need to tap into the O2 wires. will that affect the senors, since i will be connecting them in parrallel?

no, since the tap will not create resistance since the line isnt patched or extended.

[drift]

Originally posted by j.fuggi
just connect it to your ecu instead. easier...

the lead off the ecu is a direct line to the sensor. either way, an A/F meter wont harm the readings.

[drift]

Originally posted by fjt

Are you serious????? Mines where extended.Is it bad idea????

yes.


here's why:

Bosch style oxygen sensors (all are bosch style for auto applications) measure the amount of fuel in the exhaust. the sensor uses one volt, i repeat, 1 VOLT, and monitors the resistance. as unburned fuel collects on the sensor, it decreases the resistance on the sensor, lowering the output voltage of the sensor. if the motor is burning fuel properly, then there will be less unburned fuel running thru it, allowing the resistance to increase and the sensor sends out a lower voltage. it works on 0-1 volt, and changes monitored to the 100th of a volt. if you add more wire to lengthen the leads, the wires have resistance themselves, and will lower the total output voltage at any reading. with 12 volts, this is not much of a concern. at 0-1 volt being measured to the hundredths to determine fuel mixture, this could lead to leaning out of the fuel system due to the erroneous readings. .45-.55 volts is considered stoichiometric, or "perfect combustion"

[SilverY2KCivic]

Damn, well how would one go about lengthening the wires to the sensor, if say I were to want to add headers to my 6th gen Civic DX since removal of the stock headers would also elimiate the stock catalytic converter, and I'd need to get an EX or after market cat which would sit a bit further back than the stock one....

[drift]

Originally posted by SilverY2KCivic
Damn, well how would one go about lengthening the wires to the sensor, if say I were to want to add headers to my 6th gen Civic DX since removal of the stock headers would also elimiate the stock catalytic converter, and I'd need to get an EX or after market cat which would sit a bit further back than the stock one....

buy the EX oxygen sensor. crimping on longer wires or using lower quality wires will increase resistance. using an OEM harness of the proper length will keep this to the absolute minimum.

[igo4bmx]

Originally posted by drift



buy the EX oxygen sensor. crimping on longer wires or using lower quality wires will increase resistance. using an OEM harness of the proper length will keep this to the absolute minimum.

getting higher quality wiring or even thicker wiring should help right?

[xXxFLiPKiDxXx]

where would they sell OEM harness'?

[drift]

Originally posted by xXxFLiPKiDxXx
where would they sell OEM harness'?

www.oxygensensors.com

[drift]

Originally posted by igo4bmx


getting higher quality wiring or even thicker wiring should help right?

yeah, but you'll have to solder the leads, not crimp connect.

[Tofuboy]

Bosch style oxygen sensors (all are bosch style for auto applications) measure the amount of fuel in the exhaust. the sensor uses one volt, i repeat, 1 VOLT, and monitors the resistance. as unburned fuel collects on the sensor, it decreases the resistance on the sensor, lowering the output voltage of the sensor. if the motor is burning fuel properly, then there will be less unburned fuel running thru it, allowing the resistance to increase and the sensor sends out a lower voltage

Sorry to bust ya drift, this is not how an Oxygen Sensor works.

The O2 sensor is actually a little battery (galvanic Generator). It has the ability to produce a low voltage signal, but it has to be hot (approx. 600 F) before it will send a signal that the ECU will respond to.

The O2 sensor compares the oxygen content in the exhaust stream to the oxygen content in the ambient air not the HC (raw fuel). There is a passage from the top of the O2 sensor to the inner chamber to permit outside air to enter.

As the exhaust gas passes by the O2 sensor in the exhaust manifold, the O2 sensor will "sense" the amount of oxyen that the exhaust gas content, not the amount of fuel, and generate a voltage signal.

When the exhaust gas is lean (more oxygen), the voltage output is low, below approx. 450 mV. When the exhaust gas is rich (less oxygen), the voltage output is high, above approx. 450 mV.

The voltage output of a normal O2 sensor will fluctuate rapidly back and forth between approx. 100 mV to 900 mV (0-1V).

In reality there is a big difference on sensing the O2 instead of the HC and that's why it's called an Oxygen sensor, not HC sensor.:smoker2: