Closed Loop Boost/fuel Control

[Evo8John]

Are there any plans to improve the SMangager software to allow us to do closed loop boost control or allow closed loop fueling control that responds quickly enough to use at WOT in the future? Or is there processing limitations in the stock ecu that won't allow it? It would really help to expand the use of the software to keep it competitive with some of the lower level standalone setups from Fueltech and Haltech.

[Hondata]

It is a good suggestion. Last time I tested this the ECU did not have enough processing power to do PID very well, but we can look at again when we get the chance.

[Evo8John]

Awesome. Thanks for the quick reply!

[Evo8John]

Any update on this?

[1 bad em1]

Any update on this?

I asked for something similar to this but I went the other way with it, rather than try to get closed loop to respond fast enough to operate at WOT, I slowed it way down on the rate of change table.

The theory is that I have my fuel table tuned almost perfectly at WOT and then enable closed loop but keep the min s.trim value close to 0 and only allow it to really add fuel that way if it starts going lean it can add 1 percent at a time until it's back to the target afr but it does so relatively slowly to make sure it doesn't swing too far and overshoot. It works really well for minor adjustments (+1-4% or so) and your fuel table should be pretty much dialed in anyway so for me this works decently it's just not the cleanest solution and in the lower rpm I'm limited because I have to keep the s.trim min adjustment close to 0 so I occasionally run rich due to it not being able to pull out much fuel but that's the current trade off for having closed loop operate all the time during a pull and not messing with the afr negatively.

I wish there was a way to set the min/max S.Trim value based on RPM so that way I could keep the s trim set to like -10/+10 under 4k rpm but then above 4k rpm make it not able to go negative by setting the min to 0. That way in the higher rpm/WOT I don't have to worry about it going negative and pulling out too much fuel from the next cell but I get the benefit of it being able to control the afr better while cruising instead of having my car run rich to prevent the WOT from being bad.

Either way, getting the feature of being able to do "S.Trim min/max by RPM" or somehow improving the responsiveness of closed loop would be great. I really like the idea of having closed loop able to compensate at WOT, but my "slow-rate of change and prevent it from going negative" idea is the best I could come up with to keep it safe.

[Evo8John]

I guess it would be possible to have a wideband input into another controller, reference an target afr table, and then output an adjusted narrowband signal to the ecu. Then you could have a quick reaction still. Sounds much easier than it is?