[Healeys] Gunson Colortune

[Bob Spidell]

re: "The sensor does not use the exhaust as a ground" 

I believe the one-wire sensors do. All the ones I've installed have come with a special (copper-based?) anti-seize to guarantee a good ground to the exhaust. 

Since three-wires have a separate ground I can see how it would work. I think the K&N guy assumed you would use their sensors, which I believe are one-wire. 

Bob 


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Bob Spidell - San Jose, CA 

----- Original Message -----


You dont have to isolate the sensor, only the meter. The sensor is a 3 wire type (heater, sensor, ground). The sensor does not use the exhaust as a ground. Its not theory. Been there done that. 

Gergo 




2011/11/17 Bob Spidell < bspidell at comcast.net > 




Would be very interested in exactly how you did this. How do you isolate an O2 sensor? They emit a (very small) voltage signal, referenced to chassis ground, and I was told by K&N tech support that their indicators absolutely would not work on +gnd, because of their input polarity (isolation or no). 


Bob 


-------------------------------- 
Bob Spidell - San Jose, CA 







You can use it on + ground cars with no problem. Just have to isolate it from the chassis. My car is also + ground. 
BTW it may be good to point out, that there are two different types of O2 sensors awailable. The wideband and the narrow band. Though the narrow band may be usefull as a controll device, it is not particulary usefull when setting up an engine. Esp. if the negine is nonstandard. 

Gergo