Realistically, the entire MAF range is probably better off broken up into two separate 3rd orders that intersect at a point (and most likely share the same slope at that point). This will do any section you want, based on any data set you punch in. As mentioned, zeros are ignored.
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As an Excel junkie, I love the spreadsheet you made. It looks awesome and I love the simplicity of the formulas. Sometimes the most basic mathematics can provide powerful results.
Well done
gee, looks, ... familiar
hey DSteck, LARGE favor to ask... remember the dirty worksheet i posted? >.>
though from ur post in my thread: "The third order poly thing is nice to get you a rough starting point if you're way off base... but I'll never rely on it. If it results in my WOT AFR drifting away from commanded, you'd better believe I'm going to tweak the MAF table to get my desired result. Being a practicing engineer, I know all too well how "on paper" is rarely what actually happens."
somewhat goes against your OP here
Last edited by Wnts2Go10O; 12-19-2011 at 01:55 PM.
It doesn't go against it at all. It helps fill in the blanks... It's not meant to make a perfect MAF curve. I've repeatedly stated that.
I can almost guarantee the Excel sheet I posted doesn't use anything somebody's already posted. ANYBODY can plot some data, fit a trendline, and copy the coefficients out. My spreadsheet automates everything. Punch in numbers, get immediate results. I also did this completely on my own, have been doing it since well before your May 2011 post, and just decided to pretty up an existing spreadsheet I had. It also isn't back calculating on fuel delivery... It is smoothing an existing table. Why the hell am I even defending myself? I kind of read your post as saying I'm copying something you've done.
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yea, the worksheet i made is "dirty" and even said that someone could take it and clean it up make it better, etc. in my post i even suggested that maybe you could go through and add a portion with the formula from mine.
i said it looked familiar, not a copy, just familiar.
sometimes coincidences are a bit eyebrow raising.
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This will work awesome for those killer KB 4.5" tubes.
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Well this is just nasty! Thanks Steck! I'm gonna go put it to work on a non-enhanced rescaled E67 and see what happens.
Gray Ghost- The abomination. 2007 Chevrolet Silverado CCSB. 98mm turbo, nitrous, 428LSX, Rossler 80E with a brake. Finally finished. 23 psi, no numbers, Slow as hell.
PBM G8- Aluminum 364, twin Precision 67/66 turbos, 6L90 trans swap, CTS-V/Vaporworx fuel system, slowly making progress.
Dads 2011 CTS-V- Stock bottom end, stock heads, LS9 cam, pullies, ported blower, ported TB, D3 goodies, and lots of nitrous.
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Gray Ghost- The abomination. 2007 Chevrolet Silverado CCSB. 98mm turbo, nitrous, 428LSX, Rossler 80E with a brake. Finally finished. 23 psi, no numbers, Slow as hell.
PBM G8- Aluminum 364, twin Precision 67/66 turbos, 6L90 trans swap, CTS-V/Vaporworx fuel system, slowly making progress.
Dads 2011 CTS-V- Stock bottom end, stock heads, LS9 cam, pullies, ported blower, ported TB, D3 goodies, and lots of nitrous.
618/618 motor
906/862 spray
Caterpillar 50 Forklift- Duramax swap
I'm really close to finishing up a spread sheet sorta similar to extrapolate unknown values in the MAF but more handy the VE table using only KNOWN good values. Basically what you'll do is come back after a long log or tuning session and find what you where able to hit driving the car then extrapolating the rest. I've taken it out to a 6th order poly just to try to fit it as best as I can
The key thing to remember though is this is extrapolating.. Its just a guess
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Well, to be technical, mine is mostly meant for interpolating (filling in a grey area between low load and WOT), although it can be used for extrapolating.
I was going to do something for the VE table, but I don't know how to do regression for a 3D surface.
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Wow, Cool tool Steck, i'll give it a try this afternoon
@Alvin, don't get too carried away with high degree polynomials, at one moment you're overfitting. You gotta understand why the polynomials make a good approximation of the underlying physical model, and exactly what limits they come with.
Clear your PM box, Marcin.
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