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st184 sillycar Forums Junkie Location: Melbourne Registered: June 2004	Re: Aftermarket ECU legalities Tue, 07 June 2005 11:29 Modern factory ECU's generally only run in "closed loop" mode up to a certain throttle/rev range. Beyond that, the O2 sensor is just a reference, like the knock sensor, temp sensors etc. The best emissions output isn't able to be judged solely from the O2 sensor at higher loads - otherwise emissions labs would be ghost-towns ! As an example, the Gen III basically runs the injectors from a loop with the MAF sensor and O2 sensor, while the Ignition timing is more or less set to max, until the knock sensor picks up detonation. Get to around 40% throttle though, and it jumps to the maps set in memory. This is why aftermarket tuners can ditch the MAF sensor from the intake tract when they get up around 300kw, running the ECU in "speed-density" mode (like the 300kw GTS). [Report message to a moderator]

	Subject	Poster	Date
	Aftermarket ECU legalities	no_tofu_speed	Mon, 06 June 2005 11:50
	Re: Aftermarket ECU legalities	justcallmefrank	Mon, 06 June 2005 11:54
	Re: Aftermarket ECU legalities	4agte	Mon, 06 June 2005 12:09
	Re: Aftermarket ECU legalities	Merudo	Tue, 07 June 2005 00:19
	Re: Aftermarket ECU legalities	EMP-2TG	Mon, 06 June 2005 12:08
	Re: Aftermarket ECU legalities	justcallmefrank	Mon, 06 June 2005 15:03
	Re: Aftermarket ECU legalities	4agte	Mon, 06 June 2005 21:44
	Re: Aftermarket ECU legalities	justcallmefrank	Mon, 06 June 2005 23:54
	Re: Aftermarket ECU legalities	Fattony	Tue, 07 June 2005 00:20
	Re: Aftermarket ECU legalities	4agte	Tue, 07 June 2005 07:40
	Re: Aftermarket ECU legalities	justcallmefrank	Tue, 07 June 2005 00:22
	Re: Aftermarket ECU legalities	Fattony	Tue, 07 June 2005 03:13
	Re: Aftermarket ECU legalities	Chris Davey	Tue, 07 June 2005 04:21
	Re: Aftermarket ECU legalities	no_tofu_speed	Tue, 07 June 2005 05:01
	Re: Aftermarket ECU legalities	justcallmefrank	Tue, 07 June 2005 05:11
	Re: Aftermarket ECU legalities	CrUZsida	Tue, 07 June 2005 06:20
	Re: Aftermarket ECU legalities	CrUZsida	Tue, 07 June 2005 07:49
	Re: Aftermarket ECU legalities	Fattony	Tue, 07 June 2005 10:54
	Re: Aftermarket ECU legalities	4agte	Tue, 07 June 2005 11:43
	Re: Aftermarket ECU legalities	st184 sillycar	Tue, 07 June 2005 11:29
	Re: Aftermarket ECU legalities	RWDboy	Tue, 07 June 2005 13:08
	Re: Aftermarket ECU legalities	sideshow	Tue, 07 June 2005 13:15
	Re: Aftermarket ECU legalities	4agte	Tue, 07 June 2005 13:17
	Re: Aftermarket ECU legalities	draven	Tue, 07 June 2005 13:19
	Re: Aftermarket ECU legalities	Fattony	Wed, 08 June 2005 00:31
	Re: Aftermarket ECU legalities	4agte	Wed, 08 June 2005 02:25
	Re: Aftermarket ECU legalities	Fattony	Wed, 08 June 2005 03:16
	Re: Aftermarket ECU legalities	4agte	Wed, 08 June 2005 03:25
	Re: Aftermarket ECU legalities	trd3sg	Wed, 08 June 2005 04:47
	Re: Aftermarket ECU legalities	fatmr2	Wed, 08 June 2005 04:43
	Re: Aftermarket ECU legalities	trd3sg	Wed, 08 June 2005 04:58
	Re: Aftermarket ECU legalities	fatmr2	Wed, 08 June 2005 05:21
	Re: Aftermarket ECU legalities	trd3sg	Wed, 08 June 2005 06:19
	Re: Aftermarket ECU legalities	4agte	Wed, 08 June 2005 08:05
	Re: Aftermarket ECU legalities	trd3sg	Wed, 08 June 2005 08:41
	Re: Aftermarket ECU legalities	4agte	Wed, 08 June 2005 09:26
	Re: Aftermarket ECU legalities	[TOYROTA]	Wed, 08 June 2005 08:14
	Re: Aftermarket ECU legalities	BOCKA	Wed, 08 June 2005 09:00
	Re: Aftermarket ECU legalities	Fattony	Wed, 08 June 2005 09:25

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