Dragman

does anybody have any screen shots of wideband AFR error in histogram tables on WOT runs.
what error do u guys shoot for? I shoot for -9% with AFR set @11.92. any ideas? I shoot for 0% in N/A mode.

Robert56

iTrader: (2)

I was just trying this last weekend to get my HPT to log the WB AFR error, but to no avail?
Robert

Beer99C5

iTrader: (21)

Is the difference between Commanded AFR and WB indicated AFR?

Or is it actual WB error? If WB error, how to you determine the error other than say comparing to say a Dyno WB at the same time?

Robert56

iTrader: (2)

That's just it, my WB is about a point richer compared to the dyno tail pipe sniffer.
Robert

VH5150

Id go by the wideband f the tail pipe sniffer

Dragman

Commanded is what the PE table is set at. AFR error is how far it is off of that figure in percent. To get that error u have to log it in the histogram but will have to be set up to log that error. Hope that make sense!

Beer99C5

iTrader: (21)

Yep, I plot Commanded AFR vs Actual WB AFR, I will make a calc PID and convert it to Error and see what I come up with. I have some dry and wet shot logs I can play with.

Dragman

just make sure scanner in HP Tuner matches Wideband or it will never be right.

Robert56

iTrader: (2)

Beer has EFI Live, if that matters?
Robert

Robert56

iTrader: (2)

Now for those that are running Dry hits, this will be way off. As this is the premis of a dry hit, to increase DC over n/a, so your going to get a richer than commanded a/f, but we want that. i will have to think about how, or if we can get a formula that would take this into consideration and still give a error that makes sense. But would still be a benifit for our n/a concerns.
Robert

sho-me speed

iTrader: (55)

Just load the afr pid in you histograms and you can see what afr your wideband is seeing on the shot. No need for error % if you are just interested in what it was during your run.

Robert56

iTrader: (2)

Correct. I am just wondering if there is a mathmatical equation that could give us some additional insight into how a dry hit can or is performing. I am thinking there is a ratio of error compared to n/a error that may tell us something like the efficancy of a particular dry hit compared to another. don't have time to mess with it right now, but hope i remember to mess with it later as i love to do this type of challenge, and have actually come up with a few equations for this type of situation.
Robert