Using factory oxygen sensor for A/F ratio measurement

[Grim]

Is it possible to tap into the signal from the stock oxygen sensor on the front pipe to measure the air fuel ratios and tune the car?

I've seen some aftermarket gauges that apparently use the signal to report if the engine is running lean/rich but they are not reliable at all.

Is the only way to read A/F ratios to use expensive oxygen detectors at the exhaust exit?

[Cool Hand Luke]

No, any aftermarket computer will use a lambda probe (same as the standard) to measure fuel ratios. However if you disconnect your sensor from the ecu and plug it into the guage, then it will become inaccurate because the ecu needs the sensor to make fueling adjustments for part throttle, and wide open throttle. Also unless a guage gives a figure, i dont really see how its accurate... the whole rich/lean thing with a light inbetween would be no where near as accurate as a number reading.

[Grim]

So is there a way to use an aftermarket ECU (ie PowerFC) to get a reading on the AF ratio?

[BOOSTD]

I have a fuel ratio gauge connected to the oxy sensor, wouldn't use it for tuning tho unless it was calibrated against a dyno shops.

[Clint32]

You need a wide band lamba meter to get accurate air fule ratios, the factory sensor is narrow band, wide band sensors are not cheap, around 1k.

[Roy13]

You carn't use the standard items as they have a response curve centred around 14.7 : 1 were they are designed to work, you can buy a Jaycar kit that turns the output to a digital read out exetra like 12.8, 13.2 but they are only good for a rough idea.

Like mensioned above you need a wide band sensor which cost about $350 and a display to view, like the one link make for $400 expensive but look the part too.

Clint i got the ceramic clutch you sugested it is great!

[mtopxsecret6]

Which wire is the o2 sensor wire on the standard r32 ecu? or, which wire is to be used on the wiring at the o2 sensor? Thanks

[GTS-t VSPEC]

The new plug'n'play Wolfs have the ability to display the AFR's on the hand-controller from a Wide-band Lambda sensor, the sensor is additional to the cost of the ECU.

[Guest SHRIKE73]

Originally posted by mtopxsecret6

Which wire is the o2 sensor wire on the standard r32 ecu? or, which wire is to be used on the wiring at the o2 sensor? Thanks

Hey mtopxsecret6

Its wire 29 on the ECU.

Check out www.rb20det.com

[mtopxsecret6]

Thanks fella.. i have that site in my favourites.. i didnt know there was that much to it!

[4 Doorz]

What range does narrow band take into effect? E.g.13-15:1 or wider/narrower than that?

[BOOSTD]

10-19