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Old 09-13-2009, 07:21 AM   #1 (permalink)
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"Instant" values bounce around?

Are mpguinos supposed to have stable Instant MPH, MPG, GPH, etc, readings, under steady driving conditions?

I'm still adding code to my mpguino & havent wired it into my car yet. For my testing, it's running on dcb's signal generator, which I thought should provide the most stable inputs possible, but my numbers are quite jumpy.

GPH ranges from 2.01 - 2.37, MPH is 93-100 (no, i'm not using the default #defines ), MPG is 35-48, RPM is 5300-5800. My Current & Tank data are all rock steady; the problem is only with Instant. Somebody's post about GPH going "0.12 0.12 0.12 0.15 0.12 0.12 ..." made me wonder if actual - rather than simulated - driving would produce stable figures.

I'm guessing the problem is due to vss & injector pulses landing on random sides of the 1/2-second sample window. (?)

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Old 09-13-2009, 08:23 PM   #2 (permalink)
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What version of the software are you using?
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Old 09-13-2009, 08:43 PM   #3 (permalink)
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0.75. I looked at 0.82 & didn't see a change in that part of the code.
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Old 09-13-2009, 08:57 PM   #4 (permalink)
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In that case, I'm not sure. Mine was jerky on .69 but I heard about it being smoothed out, but I'm not sure for which update that was.
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Old 09-13-2009, 08:59 PM   #5 (permalink)
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So is yours still jerky? What version?
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Old 09-13-2009, 09:05 PM   #6 (permalink)
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Still jerky on .69. I'm not sure if I'll ever update it so unfortunately I can't tell you if it did indeed smooth out for my computer

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