gregturek

Has anyone figured out a way to create a math channel that gives the A/F ratio, but only at full throttle. The idea is to create a report that calculates min/max/ave, but only while at full throttle.

Thanks,
Greg

Matt Romanowski

Yes. You have to do an if statement with the condition tps greater than of 90%, 0 if not, lambda if true. Then do you channel report using average if not zero for lambda. You will. Also get a good graph with this.

You also want to look at areas of increasing throttle to check enrichment. That is an area many carburetored and aftermarket injected cars don't have correct.

gregturek

Thanks Matt! Worked like a charm. I just wish there was a min/max when not zero option for reports in addition to average.

I must be a little dense. What kind of graph were you referring to?

Thanks again,
Greg

Matt Romanowski

Just the regular measures graph (strip chart). That math channel will give you a good graph where you can see how the lambda changes as the RPMs change (look at both at the same time). The chart will only tell you the average, but not were the lambda deviates.

mglobe

Maybe it exists, and I am missing it, but the system really needs a null values. That way you could code if WOT, AFR=AFR, AFR=NULL. Then the non-value data wouldn't affect min-max, nor averages.

Matt Romanowski

They are working on that. Only 2 system do that to my knowledge. The average without zero fixes averages, max is good, it's only min that is affected.

Mahler9th

I am interested in creating math channel like this... showing AFR versus RPM at WOT. It will be my first math channel. Can any of you recommend a good video that shows the basics of setting up math channels?

Matt Romanowski

Mahler9th

Thanks Matt. I think need something more basic than that. I have no familiarity with the analysis software and speed traces, et cetera.

Matt Romanowski

http://www.aim-sportline.com/downloa...ls_101_eng.pdf

Mahler9th

Thanks Matt. I re-read that instruction. Clear as mud.

ProCoach

Matt Romanowski

Do you actually want a math channel or an XY plot?

Mahler9th

Thanks for the suggestions. I'll look into the webinars.

I am tying to do some additional tuning on track. I can use the SmartyCam video as a visual tool. But I think it should be also possible to use the logged rpm and AFR data.

What I am trying to do is create a graph or table that shows rpm versus AFR at full throttle. Ideally every 250 rpm between say 3-7k rpm, and at WOT I would have an AFR value. I think I understand that to get the table or graph I'll need a math channel first.

A "how to" video of the process would be helpful. Or even just a posting of the necessary steps/equation(s).

Does anyone here know of other forums where this has been discussed?

If necessary I can try to reach Mr. Cadell or ping Dave and Ellen, but I want to see if there is a resource already out here in cyberspace.