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Wide band reading vs megasquirt

  • Thread starter Thread starter showtime603
  • Start date Start date Jan 4, 2020
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showtime603

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Dec 22, 2019
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mississippi
Jan 4, 2020
#1
  • Jan 4, 2020
  • #1
Hey guys.. have a question.. my wide band seems to match exactly what tuner studio is seeing at idle and at cruise.. when I go to make a WOT pull or roll into boost a bit.. I swear the gauge in the car is reading leaner than what it has on the data log.. is it possible the gauge in the car just isn’t reading it out as fast as it’s being logged? For instance, I feel like I’m seeing 12.0-?11.9 but then when I look at the log it gets to 11.8-11.7 or so.. I have had to adjust the voltage to get the wide band in the car and tunerstudio to match up. But that was done at idle and cruise.. I didn’t know if I also needed to adjust for wide open throttle and if so, how? Make a pull log it and see if they match up? Maybe I’m over thinking it a bit?
 
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showtime603

New Member
Dec 22, 2019
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mississippi
Jan 4, 2020
#2
  • Jan 4, 2020
  • #2
I forgot to add it’s an AEM wide band
 

Blown88GT

Founding Member
Nov 13, 1999
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Palm Beach Gardens, FL
Jan 4, 2020
#3
  • Jan 4, 2020
  • #3
You only have a 0.2 or 0.3 difference, which happens to be 2-3%. Not enough to worry about.
 
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showtime603

New Member
Dec 22, 2019
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mississippi
Jan 4, 2020
#4
  • Jan 4, 2020
  • #4
ok thank you!
 

a91what

SendMeUrDataLog
10 Year Member
Apr 6, 2011
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Hillsborough county
Jan 4, 2020
#5
  • Jan 4, 2020
  • #5
agreed, for the hassle required to fix that much offset I would not worry about it.
 

Blown88GT

Founding Member
Nov 13, 1999
2,283
524
164
Palm Beach Gardens, FL
Jan 5, 2020
#6
  • Jan 5, 2020
  • #6
The difference is likely due to the speed (or the lack thereof) of the Megasquirt. The control loop is not that fast because it doesn't have to be fast. You will always have a difference in readings because they are not synchronized.

If you're interested, here's a NASA paper which discusses control theory for a jet engine (specifically p.3).
Not all that different from a car.
https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20100037768.pdf
 
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Fundiform

New Member
Jan 9, 2020
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Los Angeles, California
Jan 9, 2020
#7
  • Jan 9, 2020
  • #7
Yeah, to fix that much offset is nothing to worry about.
 
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