Tuning Advice & Wideband recommendations

[m_w]

After getting a new idle speed regulator installed, and the throttle stop adjusted, my car starts easily and idles. I'm now to the point (I think/hope) that I need to make the adjustments necessary to get it to idle appropriately (current idle is too high and rough).

I plan on following the fine tuning in the factory manual in section D:04:01. I also would like to use a Wideband 02 in place of the dwell meter as I think that would have a more accurate reading for CO adjustment. I plan on putting the Wideband 02 in the bung of the current 02 (first step of D:04:01 is to unplug the O2 sensor and leave it unplugged for the duration of tuning).

Does anyone have any input on this? Does anyone use a Wideband 02? if so which do you recommend?

[FABombjoy]

I think a few of us are using the LC1 or LC2 by Innovate Motorsports. I'm using the factory O2 location as well with the narrowband output connected to the Jetronic box and wideband output to a WBO2 gauge.

I've also added the Innovate LMA-3 to log RPM, MAP, and duty cycle % on the frequency valve.

[Chris 16409]

I like how Bitsyncmaster's digital Idle ECU stabilizes the idle and negates the need for the idle microswitch. I also am using a newer Volvo idle speed motor.

[Bitsyncmaster]

If you remove the stock narrow band sensor, then your lambda system will be running open loop and you won't be able to set the mixture via dwell. narrow band sensors are very accurate but only for setting 14.7 AFR. They can not be used to set any other mixture ratio.

Now if you want to run open loop then yes you can install a wideband setup into the stock bung and setting the mixture you want. The problem with that is you cannot leave the wideband sensor in the exhaust unless the wideband is powered up and running or it will damage the sensor.

I have an LC-1 wideband running in the stock bung and it drives the stock lambda system. So even with that setup, I still adjust the mixture via reading the duty cycle (dwell) so the lambda system is center in the middle of it's range. When the system is centered, it will hold the mixture you set even with altitude, air temp, barometric pressure, etc changes.