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RWDboy Forums Junkie Location: South Australia Registered: July 2002	Re: map vs. afm? Sun, 10 October 2004 16:00 Just go to Phil Bradshaw's page. AFMs are good because they can calculate the air flow based off of - well - air flow. It's not an overly complicated story but the explanation is pretty long winded I guess. I think there is a bit of a debate as to how useful they are at like 3000m above sea level but I think that conjecture is kinda unfounded. AFMs CAN be a restriction, but it's hard to say how much as most people with 'proof' only have dyno results that aren't conclusive, as opposed to a proper flow-test which is conclusive. Compared to some other restrictions in the engine (example throttle size, port sizes etc) it's not a huge part of the equation, I'm guessing around about 1% or thereabouts. If you can get a hot-wire type AFM then you are laughing, but they aren't cheap. Couple this with a boost sensor (wide band MAP sensor somewhere) to handle correction factors to the a/f ratio and you are laughing even harder. AFMs are MUCH more accurate at calculating air-flow IMHO and thus the chances of getting the correct amount of fuel to the engine (to ensure more than just good power, but also longevity of the componentry) are greatly increased. Sure maybe you could get higher air-flow and thus break dynos better with MAP, but an AFM will give you more consistent a/f ratios - which is what it's all about. Why else would we have EFI if a/f ratios weren't important! [Report message to a moderator]

	Subject	Poster	Date
	map vs. afm?	4A-GTE	Sun, 10 October 2004 08:34
	Re: map vs. afm?	DunkyMonkey	Sun, 10 October 2004 12:21
	Re: map vs. afm?	oldcorollas	Sun, 10 October 2004 12:33
	Re: map vs. afm?	mrshin	Sun, 10 October 2004 14:28
	Re: map vs. afm?	THE WITZL	Sun, 10 October 2004 14:34
	Re: map vs. afm?	mrshin	Sun, 10 October 2004 14:56
	Re: map vs. afm?	THE WITZL	Sun, 10 October 2004 15:03
	Re: map vs. afm?	no_tofu_speed	Sun, 10 October 2004 15:23
	Re: map vs. afm?	inertia	Sun, 10 October 2004 15:54
	Re: map vs. afm?	RWDboy	Sun, 10 October 2004 16:00
	Re: map vs. afm?	justcallmefrank	Mon, 11 October 2004 00:13
	Re: map vs. afm?	4A-GTE	Mon, 11 October 2004 00:49
	Re: map vs. afm?	RWDboy	Mon, 11 October 2004 01:55
	Re: map vs. afm?	THE WITZL	Mon, 11 October 2004 01:58
	Re: map vs. afm?	oldcorollas	Mon, 11 October 2004 02:14
	Re: map vs. afm?	oldcorollas	Mon, 11 October 2004 02:16
	Re: map vs. afm?	RWDboy	Mon, 11 October 2004 02:34
	Re: map vs. afm?	indian	Mon, 11 October 2004 05:47
	Re: map vs. afm?	quest	Wed, 13 October 2004 23:26
	Re: map vs. afm?	RWDboy	Thu, 14 October 2004 02:37
	Re: map vs. afm?	quest	Thu, 14 October 2004 06:32

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