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 Post subject: Re: MAF Shaping and Scaling Spreadsheet
PostPosted: Tue Feb 21, 2017 4:49 pm 
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Newbie

Joined: Mon Dec 29, 2014 12:03 pm
Posts: 94
Perscitus wrote:
hey 86inches, I took another stab at the smoothing and purposefully leaned out the top of the curve a bit more.

Let me know what you think and if I'm getting the idea of how to use the tool.

I've added a few additional tabs that make it easier for me to zoom in on particular voltage ranges (very low, idle, mid, high etc.)
Would actually be great if I could make CAL adjustments on those tabs to see how the plot changes but flipping back and forth between tabs isn't bad either.


I really like the additional sheets youve added.

It looks like you are manipulating the ouput correctly, adjusting higher voltage cells by altering the cal line in lower voltage cells. Have you observed more accurate fueling from this revision?


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 Post subject: Re: MAF Shaping and Scaling Spreadsheet
PostPosted: Wed Feb 22, 2017 11:25 am 
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Newbie

Joined: Mon Mar 09, 2015 4:22 pm
Posts: 76
86inches wrote:
I really like the additional sheets you've added.
It looks like you are manipulating the output correctly, adjusting higher voltage cells by
altering the cal line in lower voltage cells. Have you observed more accurate fueling from this revision?

Good to hear! Yes, even with the first smoothed MAF curve, fueling and low-end driveability improved significantly.
I think a lot of it has to do with what you said in your first post and what I think we've all seen (at some point)
where the ECU 'likes' a smooth MAF curve. Must have something to do with the interpolation it itself does between the points
and how the ECU logic goes iterates through the MAF curve data points as you trace up and down the curve while driving.

I've noticed smoother, improved low speed acceleration and deceleration (seem the TCU indirectly also likes a smoother
MAF curve which must translate to better Load transitions, Requested Torque, etc.), tighter CL fuel trims
and a lower OL AF Error%.


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 Post subject: Re: MAF Shaping and Scaling Spreadsheet
PostPosted: Thu Mar 16, 2017 8:14 pm 
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Newbie

Joined: Thu Jun 09, 2011 5:10 pm
Posts: 21
Hi all , I have corrected maf using vgi tool and also rescaled as the BRZ maf useable V is only around 4.1-4.2 in NA form

I have smoothed using the maf shaping utility , just wondering if someone could look over it and see if I have don't it right

thanx heaps for help


Attachments:
dirkltestmaffffffinalf.xlsx [55.83 KiB]
Downloaded 271 times
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 Post subject: Re: MAF Shaping and Scaling Spreadsheet
PostPosted: Fri Mar 17, 2017 4:19 pm 
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Newbie

Joined: Mon Dec 29, 2014 12:03 pm
Posts: 94
diggs30 wrote:
Hi all , I have corrected maf using vgi tool and also rescaled as the BRZ maf useable V is only around 4.1-4.2 in NA form

I have smoothed using the maf shaping utility , just wondering if someone could look over it and see if I have don't it right

thanx heaps for help


It Looks like youve got the right idea, the caclulated curve looks to fit the scaled MAF well. Ultimately it all comes down to performance. Is your fueling more accurate after smoothing?


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 Post subject: Re: MAF Shaping and Scaling Spreadsheet
PostPosted: Sun Jun 25, 2017 9:35 am 
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Newbie

Joined: Mon Dec 29, 2014 12:03 pm
Posts: 94
6/25 added another version with a sheet that can be set up to show AFR delivered by an incorrect scale.


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 Post subject: Re: MAF Shaping and Scaling Spreadsheet
PostPosted: Tue May 12, 2020 1:12 pm 
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RomRaider Donator

Joined: Wed Feb 06, 2019 8:45 pm
Posts: 18
Location: Harrisburg, Pa
I must be an idiot because I'm so confused, I want to smooth my maf but i'm lost. can anyone dumb it down even further?

0.94 0.98 1.02 1.05 1.09 1.13 1.17 1.21 1.25 1.29 1.33 1.37 1.41 1.48 1.56 1.64 1.72 1.80 1.88 1.95 2.03 2.11 2.19 2.27 2.34 2.42 2.54 2.66 2.77 2.89 3.01 3.13 3.24 3.36 3.48 3.59 3.71 3.83 3.95 4.06 4.18 4.30 4.41 4.49 4.57 4.61 4.65 4.69


1.36 1.79 2.02 2.27 2.52 2.90 2.97 3.16 3.16 3.52 3.80 4.23 4.77 6.07 7.27 8.27 9.75 11.92 13.73 15.41 17.61 19.68 22.40 25.43 28.24 32.11 37.80 43.63 48.74 54.77 61.78 69.66 78.04 88.20 100.21 113.65 127.78 142.38 156.30 168.11 183.00 212.00 260.70 280.86 301.03 311.14 315.24 319.36


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 Post subject: Re: MAF Shaping and Scaling Spreadsheet
PostPosted: Tue May 12, 2020 1:26 pm 
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Experienced

Joined: Fri Jan 10, 2020 4:31 pm
Posts: 210
Location: Canaduh
ThrobbinWilliams wrote:
I must be an idiot because I'm so confused, I want to smooth my maf but i'm lost. can anyone dumb it down even further?

0.94 0.98 1.02 1.05 1.09 1.13 1.17 1.21 1.25 1.29 1.33 1.37 1.41 1.48 1.56 1.64 1.72 1.80 1.88 1.95 2.03 2.11 2.19 2.27 2.34 2.42 2.54 2.66 2.77 2.89 3.01 3.13 3.24 3.36 3.48 3.59 3.71 3.83 3.95 4.06 4.18 4.30 4.41 4.49 4.57 4.61 4.65 4.69


1.36 1.79 2.02 2.27 2.52 2.90 2.97 3.16 3.16 3.52 3.80 4.23 4.77 6.07 7.27 8.27 9.75 11.92 13.73 15.41 17.61 19.68 22.40 25.43 28.24 32.11 37.80 43.63 48.74 54.77 61.78 69.66 78.04 88.20 100.21 113.65 127.78 142.38 156.30 168.11 183.00 212.00 260.70 280.86 301.03 311.14 315.24 319.36


If you use ECU flash and look at your MAF area with the graph view you can see how smooth your curve is. Anything that is spiky or uneven could use some work.

Also smoothing out your MAF will take some data logging of your STFT and seeing where you are running rich or lean.

LTV if you can use it will also show you were your MAF is off.


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 Post subject: Re: MAF Shaping and Scaling Spreadsheet
PostPosted: Tue May 12, 2020 6:19 pm 
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RomRaider Donator

Joined: Wed Feb 06, 2019 8:45 pm
Posts: 18
Location: Harrisburg, Pa
i have my maf pretty well dialed in. working on the closed loop my biggest ltv is like 4-5%, as for open loop i have afr almost dead on but the curve is bugging me though and i need to smooth it or i wont be satisfied lol


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 Post subject: Re: MAF Shaping and Scaling Spreadsheet
PostPosted: Thu May 21, 2020 3:07 am 
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RomRaider Donator

Joined: Tue Apr 29, 2014 12:48 am
Posts: 946
ThrobbinWilliams wrote:
i have my maf pretty well dialed in. working on the closed loop my biggest ltv is like 4-5%, as for open loop i have afr almost dead on but the curve is bugging me though and i need to smooth it or i wont be satisfied lol


plot both the stock MAF scale and your modified one (2 times) start modifying one of them to be smooth perfectly like the Stock MAF Scale and be as close as possible to the modified one that gives you the best AFR.

hope it's clear!

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 Post subject: Re: MAF Shaping and Scaling Spreadsheet
PostPosted: Sun Feb 21, 2021 9:30 pm 
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RomRaider Donator

Joined: Fri Oct 07, 2016 12:36 am
Posts: 55
So I have been playing with my o2 sensor trying to smooth my idle. I remembered this thread and decided to plot my o2 sensor map along with the a couple derivatives just for giggles.

I found a jumping 2nd Derivative. You are right about how hard it is just to input numbers and see what you get. I was able to smooth it out a little and noticed improvement.

So I am having trouble understanding how you built the spreadsheet. Do you have any hand calcs that might give be a better idea of what you did? Now on the o2 sensor map, the current crosses 0. I am not sure what that will do to the equation you developed for the MAF.

Any help would be appreciated.


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