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SUPRAGTE Forums Junkie Location: North Sydney Registered: May 2002	Re: How does the 7m-gte boost retard ?? Sun, 01 December 2002 06:13 Ed the volume of air going through the airflow meter on a 7MGTE engine will tell you exactly how much pressure is in the manifold. The 7MGTE also measures the temp of the incoming air and this gives you the exact density so you have precisely the amount of air going into the engine. Density X Flow = Volume From this pressure is calculated. Thats how the ignition is retarded. Quote: no, youre right about the calculation of airflow, but im talking about timing...when you increase intake pressure, you're effectice compression ratio increases, and this needs to be compensated for by timing rertard. trying to calculate this effective CR simply through predicitve RPM, TPS and AFM signals is not an optimum solution... The ECU doesn't care what the effective CR is. It's only concerned with A/F ratios out the exhaust and if they are within setpoints. Different compression ratios will affect the AF ratios and thats what i was saying in the first place. I stand by that. It will affect it. If you have the same injector pulse width on a 10:1 engine as a 8:1 CR engine you will get vastly different AF ratios. [Report message to a moderator]

	Subject	Poster	Date
	How does the 7m-gte boost retard ??	ed_ma61	Wed, 27 November 2002 03:51
	Re: How does the 7m-gte boost retard ??	SUPRAGTE	Wed, 27 November 2002 04:22
	Re: How does the 7m-gte boost retard ??	inferno	Wed, 27 November 2002 13:36
	Re: How does the 7m-gte boost retard ??	Norbie	Wed, 27 November 2002 04:33
	Re: How does the 7m-gte boost retard ??	scottee78	Wed, 27 November 2002 04:44
	Re: How does the 7m-gte boost retard ??	Norbie	Wed, 27 November 2002 05:27
	Re: How does the 7m-gte boost retard ??	scottee78	Wed, 27 November 2002 05:40
	Re: How does the 7m-gte boost retard ??	ed_ma61	Wed, 27 November 2002 08:24
	Re: How does the 7m-gte boost retard ??	SUPRAGTE	Wed, 27 November 2002 13:15
	Re: How does the 7m-gte boost retard ??	ed_ma61	Wed, 27 November 2002 13:41
	Re: How does the 7m-gte boost retard ??	gianttomato	Wed, 27 November 2002 20:52
	Re: How does the 7m-gte boost retard ??	humble	Wed, 27 November 2002 22:20
	Re: How does the 7m-gte boost retard ??	Norbie	Wed, 27 November 2002 22:42
	Re: How does the 7m-gte boost retard ??	gianttomato	Wed, 27 November 2002 23:05
	Re: How does the 7m-gte boost retard ??	SUPRAGTE	Thu, 28 November 2002 12:19
	Re: How does the 7m-gte boost retard ??	ed_ma61	Thu, 28 November 2002 13:25
	Re: How does the 7m-gte boost retard ??	SUPRAGTE	Fri, 29 November 2002 06:38
	Re: How does the 7m-gte boost retard ??	ed_ma61	Fri, 29 November 2002 12:32
	Re: How does the 7m-gte boost retard ??	justcallmefrank	Sat, 30 November 2002 07:28
	Re: How does the 7m-gte boost retard ??	SUPRAGTE	Sun, 01 December 2002 06:13
	Re: How does the 7m-gte boost retard ??	Esteban	Mon, 02 December 2002 06:56
	Re: How does the 7m-gte boost retard ??	SUPRAGTE	Tue, 03 December 2002 02:50
	Re: How does the 7m-gte boost retard ??	1G-GTEFreAk	Thu, 02 January 2003 17:05

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