Disconnecting the O2 sensor

[Java]

Will my 1981 911SC run leaner or richer with the O2 sensor disconnected? The reason I ask is that I have been running with 87 Octane gas and I never noticed any pinging. Recently, I disconnected the O2 sensor, I heard a very slight ping when it is under load. Does it make sense? Will the engine gain more low end performance. I notice a little bit of low end performance increase. Is that my imagination?

[emcon5]

It depends on where the base mixture is set.

With the sensor disconnected, the Lamda system will assume a cold engine and default the frequency valve to 60% duty cycle (for 1981-83). With everything connected and working, the Lamda system will tweak the frequency valve duty cycle up and down based on the signal from the O2 sensor.

Tom

[Java]

Thanks Tom. If the base mixture is set at factory setting, is 60% duty cycle richer or leaner? Also, how do I determine the level the base mixture is set at?

[Java]

Can any one explain to me how to adjust base mixture? I recall reading performance improvement by disconnecting the O2 sensor and setting the mixture a little richer (1981 911SC). Please share your experience. Thanks