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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: map vs. afm?
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Mon, 11 October 2004 02:14
 
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what they all said 
what was said when Megasquirt was developed was:
although AFM may be a better measure of air, for 95% of applications the difference is small enough to be negligible.
MAP is much easier to set up for a variety of engines, whereas making a circuit to couple to a variety of AFM's is not so easy.
a MAP sensor is good, but will suffer when you have large overlap cams and poor idle vacuum. not a prob for you.
a MAP sensored ECU will only be as good as it's tune to the particular state of the engine. if you modify the motor (intake, exhaust etc) then it can go out of tune easily, since it is tuned to the manifolds pressure, rather than airflow directly.
with AFM, you are tuning to the amount of air going in, so unless you have massive air leaks, the AFM will be able to respond to a large range of engine mods WITHOUT retuning.
ideally, you would get a vane type AFM, which is large enough to not pose a restriction (the square hole, not the vane), and has nearly full vane defleection at max rpm-WOT.
if you have an AFM with a 1" square hole, of course it will "literally" suck.
with hot wire AFM's, need to remember to have good temp compensation, as different air temps will change the cooling effect on the hot wire.
Cya, Stewart
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| | Subject | Poster | Date |
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map vs. afm?
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4A-GTE | Sun, 10 October 2004 08:34 |
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Re: map vs. afm?
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DunkyMonkey | Sun, 10 October 2004 12:21 |
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Re: map vs. afm?
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oldcorollas | Sun, 10 October 2004 12:33 |
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Re: map vs. afm?
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mrshin | Sun, 10 October 2004 14:28 |
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Re: map vs. afm?
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THE WITZL | Sun, 10 October 2004 14:34 |
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Re: map vs. afm?
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mrshin | Sun, 10 October 2004 14:56 |
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Re: map vs. afm?
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THE WITZL | Sun, 10 October 2004 15:03 |
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Re: map vs. afm?
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no_tofu_speed | Sun, 10 October 2004 15:23 |
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Re: map vs. afm?
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inertia | Sun, 10 October 2004 15:54 |
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Re: map vs. afm?
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RWDboy | Sun, 10 October 2004 16:00 |
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Re: map vs. afm?
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justcallmefrank | Mon, 11 October 2004 00:13 |
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Re: map vs. afm?
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4A-GTE | Mon, 11 October 2004 00:49 |
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Re: map vs. afm?
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RWDboy | Mon, 11 October 2004 01:55 |
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Re: map vs. afm?
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THE WITZL | Mon, 11 October 2004 01:58 |
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Re: map vs. afm?
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oldcorollas | Mon, 11 October 2004 02:14 |
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Re: map vs. afm?
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oldcorollas | Mon, 11 October 2004 02:16 |
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Re: map vs. afm?
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RWDboy | Mon, 11 October 2004 02:34 |
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Re: map vs. afm?
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indian | Mon, 11 October 2004 05:47 |
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Re: map vs. afm?
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quest | Wed, 13 October 2004 23:26 |
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Re: map vs. afm?
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RWDboy | Thu, 14 October 2004 02:37 |
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Re: map vs. afm?
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quest | Thu, 14 October 2004 06:32 |
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