Wideband 4.9 lambda afr setting

[Lundegaard]

Have just installed a plx wideband bluetooth.
Very easy to install and works great, you can custom setup the colors on your phone😀
My question is, can you adjust the AFR, i have a idea that the lamba is trying to set the AFR at 14,7 all time except when you have WOT? When idle and crusing 1500-3000 rpm i read 14,4-14,9 AFR all the time only when WOT it drops to 12-13AFR?

[76FJ55]

You are correct in that when the system is operating in closed loop, it is trying to achieve 14.7.

[dicklague]

14.7 is optimum mixture.

You do want WOT and high power production to be bit richer just to be safe.

[Lundegaard]

Dicklague.
But how du i adjust WOT, or is it even possible?

[76FJ55]

what year and model are you working on? yes there are methods of adjusting WOT mixture but it varies depending on what type of system you are running.

[Lundegaard]

1980 sc lamba original system.

[Pazuzu]

1980 has the simplest (dumbest) lambda system, there is no modifying it. It doesn't have the idle and WOT switches that the 81-83 has.

Best option is to disconnect the O2 sensor from the harness which defaults it to an open loop.