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Old 04-20-2010, 09:47 PM   #1
Bad Noodle
Scooby Specialist
 
Member#: 174442
Join Date: Mar 2008
Chapter/Region: Tri-State
Location: NNJ
Vehicle:
2007 SuperWagon
I don't spell well

Default MAF Scaling - Smoothness Theory (Some Experiments)

So I've been wondering how "smooth" a maf scaling has to be. So I did some homework and made a tool that "best" fits some high order polynomial equation to the maf scaling. Taking into account suggested corrections for romraider's maf tool and airboy's spreadsheet.

So here's my original scaling that kept all my fuel trims <4%

Maf Scaling:



first discrete derivative to show smoothness or slopes between cells




Not so good. Looks like it could be smoother. So I used the smoothing tool and got:



and the smoothness looks like:





Loaded the map and tried it out. Took the CL part for a spin and found out I have 18% - 7% corrections all over the place. So then I applied the RR suggested corrections to my maf scaling and I'm back at:


for smoothness.







So, in conclusion, it looks like the maf curve doesn't have to be "super smooth" From what I can tell, as long as there are no jagged spikes or huge dips in the scaling, it's all good.

-BN
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