Feature request: WUE map

[subwoofer]

I will back this up with data (scatter plots) as soon as I have sorted a MAF contamination problem.

From the AFR gauge it would seem that the %age WUE may not be the best solution. When tuned for no AFR change at idle it will go pig rich when driving off. I think an rpm/clt WUE table might do the trick. Further investigation will show if there is a large map or TPS dependency too.

What do the rest of you think?

[krisr]

100% agree that WUE needs to be a table BUT I think there should be 2 changes,

1) WUE/ASE if incorporate AFR is enabled, is a multiplier of the commanded AFR rather than a multiplier of the PW - once the wideband is warmed up, there's no reason why we couldn't enable CL fuelling from the get go.
2) WUE table is MAP/CLT. I don't think RPM/CLT would work unless you have a manual transmission - maybe the option to use rpm or map would work?

[subwoofer]

1) WUE/ASE if incorporate AFR is enabled, is a multiplier of the commanded AFR rather than a multiplier of the PW - once the wideband is warmed up, there's no reason why we couldn't enable CL fuelling from the get go.

I don't know about you, but I want my AFRs just where they are supposed to be even at warmup. I don't want to run richer, thus WUE in the form of an AFR adder is useless. I already run CL from a CLT 15°C, but it is not fast enough - nor have enough authority - to tame the WUE.

2) WUE table is MAP/CLT. I don't think RPM/CLT would work unless you have a manual transmission - maybe the option to use rpm or map would work?

I don't see how the transmission has anything to do with WUE mapping? But you could be right that the correct mapping will be MAP/CLT, will have to review a few logs to find out. I just hope it will not need to be both MAP and RPM.

[subwoofer]

In support of the feature request, and krisr's opinion I might add: http://www.linkecu.com/support/glossary/warm-up-def

[Matt Cramer]

I would expect higher air flow rates to require less WUE, similar to the EAE settings. Since WUE is to compensate for fuel sticking to cold intake ports, it would make sense for higher flow rates to pull more fuel off the walls and hence need less WUE.

[subwoofer]

Are you implying that a wall adhesion model should be used, and would produce better results than a WUE map? Could we really have any hope of tuning such a beast?

[Matt Cramer]

I'm saying that WUE is a form of wall adhesion. A 3D map would compensate for it, but I'm thinking a second 2D curve for how much to reduce WUE based on either MAF reading or MAP * RPM may be a little simpler to tune.

[subwoofer]

Good idea. So we have at least three different options to explore with scatter plots:

1. 3D map, CLT vs RPM
2. 3D map, CLT vs load (TPS/MAP/MAFload)
3. 2x 2D curves as described by Matt

Colder weather is coming, within 3 months I'll have data over a 100°C CLT span.