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SUPRAGTE Forums Junkie Location: North Sydney Registered: May 2002	Re: knock sensor location ?? Thu, 03 October 2002 10:04 The ecu goes open loop until operating temp is reached then closed loop whilst "cruising". IE 0% to 75% as Norbie says then anything else it goes to open loop lookup tables. But there are also other times when closed loop activates. IE if you accelerate quickly(faster than a preset milisecond value, not sure what it is on a standard 7mgte ecu) it's commonly refered to as "PUMP". It gives the engine extra timing and added fuel so the response feels crisp in response to your foot. Ever see a Sti WRX blow a heap of black smoke when he's dragging someone off? This is exactly whats happening, well similar actually cause the added fuel actually helps the density in the exhaust gases be heavier and this will turn the exhuast turbine faster thus minimising turbo lag. Closed loop, also reads in the O2 sensor to get the stoichiometric ratio of 14.7 by triming fuel mixtures. [Report message to a moderator]

	Subject	Poster	Date
	knock sensor location ??	ed_ma61	Wed, 02 October 2002 11:39
	Re: knock sensor location ??	SUPRAGTE	Thu, 03 October 2002 01:48
	Re: knock sensor location ??	gianttomato	Thu, 03 October 2002 02:03
	Re: knock sensor location ??	SUPRAGTE	Thu, 03 October 2002 05:11
	Re: knock sensor location ??	gianttomato	Thu, 03 October 2002 05:47
	Re: knock sensor location ??	ed_ma61	Thu, 03 October 2002 06:07
	Re: knock sensor location ??	Norbie	Thu, 03 October 2002 08:20
	Re: knock sensor location ??	ed_ma61	Thu, 03 October 2002 08:40
	Re: knock sensor location ??	gianttomato	Thu, 03 October 2002 08:45
	Re: knock sensor location ??	ed_ma61	Thu, 03 October 2002 08:54
	Re: knock sensor location ??	SUPRAGTE	Thu, 03 October 2002 10:04
	Re: knock sensor location ??	justcallmefrank	Thu, 03 October 2002 11:02
	Re: knock sensor location ??	SUPRAGTE	Fri, 04 October 2002 13:41
	Re: knock sensor location ??	bluesupra	Sat, 19 March 2005 01:06
	Re: knock sensor location ??	CrUZsida	Sat, 19 March 2005 09:20

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