lambda sensor wiring

[martinlaw]

Vehicle electrics are not my forte.

I am fitting a fuel/air ratio guage to my GTR and the lambda sensor I have has three wires, two white and one black.

I assume the black is the signal wire which attaches to the signal input on the guage. The two white wires must be for the heater in the sensor??

This is the problem - does it matter which way around the white wires are connected assuming one white wire to earth and one to 12v supply.

Can i used the same earth and 12v supply to power the guage?

Finally, I assume the 12v supply should come from the ignition switch?

Any advise would be appreciated.

Thanks,
Martin.

[Pb3]

You have a three wire narrow band sensor, the black is the signal and yes the two whites provide heater power, ie one +ve and one to chassis ground.

Really a wide-band sensor would have been better, specially as you will probably be running rich and well off the narrow band range of operation in most cases!.

[eliot]

Indeed.
I have a wideband in one bank and a narrowband in the other bank. I find the narrow band gives a reasonable indication from about 14.7 through to 11:1 afr, but is next to useless for anything leaner. In order to save fuel, I have tuned my cruise mixture down to a safe 15:1 ratio and my 20 LED narrow band doesn't even light up.

Still its better than nothing - and its good fun being able to see in real time what your engine is doing - Enjoy!

[kylemrushall]

Martin, I would say you definately want a wide band, these engines are old technology and from what i have seen so far struggle to stay in narrow band constaints!!

[Pb3]

Don't forget also that a 14.7:1 air fuel ratio is not where the power is either, at some points ie wide open throttle you want 12.5 to 13.5. That is not best for emissions though, for which a narrow band sensor is really imployed for.

[martinlaw]

Thanks for the advise guys - it looks like a wide band sensor then.

Cheers,
Martin.

[crafty]

Martin.... have a look at the Innovate products with datalogging.

http://www.innovatemotorsports.com

http://www.innovatemotorsports.com/support/manual/...

[ringram]

I distro innovate products if it helps anyone

[eliot]

martinlaw said:

Thanks for the advise guys - it looks like a wide band sensor then.

Cheers,
Martin.

Indeed - I hope you didn't spend too much on the narrowband.

[ringram]

The innovate LC1 has 2 outputs both programmable, one by default is configured as narrowband and the other wideband.
They arnt too much. They are pretty much the best value widebands around.

You can probably wide just about any generic narrow band in there cheaper mind you.
It depends if you fancy knowing more about what your fueling is doing. Innovate also do gauge kits with digital or analog 52mm gauges that read wideband output. Backlit for night etc too.