WBO2 Heating

[Tcal]

What´s the recommended heating time to that LSU4 sensor?
If that time is too short, will it cause problems like false reading or something?

[dnb]

I use 25 seconds.  It seems to work OK.

[Tcal]

I´d like to hear others comment on this too, anybody?
What are your experiences on this, i´ve read somewhere that normal ecus heat that LSU about 20 secs??

[rob@vems.co.uk]

The sensor's heater is monitored and a reading is not given until it reaches its operating temperature.
Which warm-up time setting are you thinking of?

[Tcal]

So if i set it like 2 seconds, it won´t give me any reading before it´s heated properly and is giving correct value? correct?
Will this cause problems?

I have that time set to 40 secs now.

[rob@vems.co.uk]

Where are you setting this?

[Tcal]

Settings -> EGO control -> Warmup time.

Hmm i did think this again..
That doesn´t change that O2 heating, it´s the time when vems starts to show/use lambda ?
It´s the warmup ramp in settings -> wideband settings, that change´s that heating time ?

[rob@vems.co.uk]

Leave the wideband settings alone! They should be setup as per the instructions here: http://www.vems.co.uk/forum/index.php?topic=55.0
As for the EGO value - 60seconds is usually enough.

Cheers

Rob

[Tcal]

Those WB settings are bit modified by the previous owner:

fallback V after maxt is 96

Pump KP 64
Pump KI 46
Pump KD 8

Other´s values are as in instructions...
I don´t know the reason why those are changed.
IMO are those pump settings more aggressive than factory or how would those make difference?

And what does that fallback change?

Maybe i should try those "original" settings too and see if that lambda behaves differently.

And the reason why i´d like to set that EgoC on as fast as possible is because in cold weather like today (-28c) engine doesn´t run as it should when warm engine is started and that IAT looks like -14. No problems usually in norm temperatures.

[rob@vems.co.uk]

Use the suggested PID settings, these are the ones that have been developed specifically for driving this sensor.
What do they change? I cant honestly say as I have very limited knowledge on the way the Pump and Nerst closed-loop control actually works.

Its going to take an amount of time to get the sensor hot enought to provide a correct reading, no matter what you do.

If you are having problems at lower temperatures then this is really a cold start enrichment issue rather than the way the sensor is being driven - chances are you're way too lean.  Although this graph is for crank fueling it does show how the fuel requirement increases massively with small temperature changes as things get colder - note the difference in fueling between -15 and -25