I have never seen this topic covered, when we are running modified exhausts with no catalyst why leave the engine constantly switching from +/- 14.7 for the heater function to feed air then fuel over and over? Wouldn't we get better consumption since that extra fuel under 14.7 is pointless as we dont need to keep anything hot?

My car (me7.1) runs much smoother at idle and part throttle with o2s unplugged, killing trims and also the switching. Do others commonly do this and I am just behind the curve?

I would like to keep the sensors plugged in for trims and CL but not have it switch, I found these maps:

0x14efa - LAMSOSUF = 0.998779
0x14ef8 - LAMSOSOF = 1.001221   (you can edit them to 1.000888 as the closest to a true 1.00)

In the motronic me7.1 M-Box, I am going to try putting them both to 1, based off my reading I believe they are the upper and lower targets for the switch which in turn over shoots them both each time and forms a sine wave like afr pattern. Unless someone tells me not to I am thinking I can have both at 1 and it will not fluctuate???

Thanks in advance for any info that can be shared.

How do we do that, the sai euro switch?

I noticed this in Banish's book:
"For this reason, many OEM vehicles sold today approach L = 0.82 (12.0:1 air/fuel) or richer once catalyst protection threshold has been reached. Unlocking control of this protection can be the key to properly calibrating such vehicles." Greg Banish, Engine Management, Advanced Tuning, p. 53.

And if we did disable this protection (which is probably there to make the CC last throughout the emissions warranty) what happens, does the CC just burn through, or does it get clogged - what does enrichment protection seek to do?

B_kh = 0 once the threshold FKHABMN is reached.

Have you tried setting FKHABMN to zero?

i cannot locate those scalars/maps in m-box, h-box.  I have FKHABMN on F-box and can probably look at hex to find it in m.

B_kh and FKHABMN where two I looked into because from my reading it seemed they would be related if not responsible for the heating being on or off

FKHABMN - threshold terminating factor catalyst heating
0x1937D
Conversion - X*0.003906

Ok, had a chance to mess with it today, simply setting FKHABMN to 0.00 does indeed kill it.  I used the map settings above from phil and they worked perfect.

The idle is rock solid now and there is less fuel smell than is usually associated with running cat-less.  I am going to add this to the wiki because IMHO everyone not running cats should do this, there is no downsides that i can possibly see and the car is technically running better and more efficient.

Sweet, thanks for the location/XDF info. I'll see if this reduces my gas stank.

Just got my car back together and added this to my tune.  THIS WORKS GREAT!  Idle is now rock solid.  No more switching back and forth.  This should be kept to the top.