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ke382TG Forums Junkie Registered: May 2002	Re: 1g-gte AFM OPTIONS Wed, 14 July 2004 06:24 Ok here are some things I have found while making changes to my car (4AGTE) I know it's a different engine but the principles are still the same. Full factory ECU on mine (vane type AFM) compressor surge (the fluttering noise) was common, after switch to aftermarket ECU removal of AFM no other changes and the compresser surge disappeared (gained significant midrange power/torque at same boost level too). The blow off valve does not make the fluttering noise when you lift of the pedal, instead this occurs when the blow-off valve is not opening or is opening in a delayed manner (i.e. fluttering noise of compressor surge then BOV opens and vents the excess pressure). The fluttering is compressor surge, an effective BOV set up correctly should eliminate this fluttering on throttle lift off. I have been in cars where the owners have thought the fluttering WAS the BOV, they didnt realise that there BOV was not even opening Compressor surge on accelleration can be most simply described as being caused by the turbo compressor creating more "air" than the engine can consume thus buffeting the compressor with the excess "air" and causing the fluttering sound you hear. This whistling noise on throttle lift off has got me confused though? Oh yeah, high flowed turbos are more prone to compressor surge if they have had the compressor wheel upsized and not the exhaust wheel. Don't know if I answered any questions but I hope I have shed some light on the situation. [Updated on: Wed, 14 July 2004 06:26] [Report message to a moderator]

	Subject	Poster	Date
	1g-gte AFM OPTIONS	indian	Wed, 14 July 2004 05:09
	Re: 1g-gte AFM OPTIONS	dcving	Wed, 14 July 2004 05:35
	Re: 1g-gte AFM OPTIONS	indian	Wed, 14 July 2004 05:42
	Re: 1g-gte AFM OPTIONS	thechuckster	Wed, 14 July 2004 05:47
	Re: 1g-gte AFM OPTIONS	indian	Wed, 14 July 2004 05:50
	Re: 1g-gte AFM OPTIONS	thechuckster	Wed, 14 July 2004 06:33
	Re: 1g-gte AFM OPTIONS	indian	Wed, 14 July 2004 06:35
	Re: 1g-gte AFM OPTIONS	Bugman	Wed, 14 July 2004 05:59
	Re: 1g-gte AFM OPTIONS	indian	Wed, 14 July 2004 06:01
	Re: 1g-gte AFM OPTIONS	BLK1GGTE	Wed, 14 July 2004 06:02
	Re: 1g-gte AFM OPTIONS	indian	Wed, 14 July 2004 06:07
	Re: 1g-gte AFM OPTIONS	ke382TG	Wed, 14 July 2004 06:24
	Re: 1g-gte AFM OPTIONS	indian	Wed, 14 July 2004 06:32
	Re: 1g-gte AFM OPTIONS	thechuckster	Wed, 14 July 2004 06:37
	Re: 1g-gte AFM OPTIONS	thechuckster	Wed, 14 July 2004 06:39
	Re: 1g-gte AFM OPTIONS	wilbo666	Wed, 14 July 2004 06:31
	Re: 1g-gte AFM OPTIONS	ke382TG	Wed, 14 July 2004 06:44
	Re: 1g-gte AFM OPTIONS	Bugman	Wed, 14 July 2004 06:48
	Re: 1g-gte AFM OPTIONS	indian	Wed, 14 July 2004 06:51
	Re: 1g-gte AFM OPTIONS	Bugman	Wed, 14 July 2004 06:50
	Re: 1g-gte AFM OPTIONS	Bugman	Wed, 14 July 2004 06:53
	Re: 1g-gte AFM OPTIONS	indian	Wed, 14 July 2004 06:54
	Re: 1g-gte AFM OPTIONS	thechuckster	Wed, 14 July 2004 06:55
	Re: 1g-gte AFM OPTIONS	indian	Wed, 14 July 2004 06:56
	Re: 1g-gte AFM OPTIONS	ke382TG	Wed, 14 July 2004 06:58
	Re: 1g-gte AFM OPTIONS	indian	Wed, 14 July 2004 07:06
	Re: 1g-gte AFM OPTIONS	wilbo666	Wed, 14 July 2004 07:57
	Re: 1g-gte AFM OPTIONS	Fattony	Wed, 14 July 2004 08:57
	Re: 1g-gte AFM OPTIONS	Bugman	Wed, 14 July 2004 09:13
	Re: 1g-gte AFM OPTIONS	Testa_Dura	Wed, 14 July 2004 09:40
	Re: 1g-gte AFM OPTIONS	indian	Wed, 14 July 2004 22:40
	Re: 1g-gte AFM OPTIONS	Norbie	Wed, 14 July 2004 22:47
	Re: 1g-gte AFM OPTIONS	indian	Wed, 14 July 2004 22:50
	Re: 1g-gte AFM OPTIONS	punkdefender	Thu, 15 July 2004 05:37
	Re: 1g-gte AFM OPTIONS	indian	Sun, 18 July 2004 22:42
	Re: 1g-gte AFM OPTIONS	punkdefender	Tue, 07 September 2004 02:49
	Re: 1g-gte AFM OPTIONS	Fattony	Thu, 15 July 2004 07:40
	Re: 1g-gte AFM OPTIONS	punkdefender	Thu, 15 July 2004 07:59
	Re: 1g-gte AFM OPTIONS	exquisit	Thu, 15 July 2004 18:40
	Re: 1g-gte AFM OPTIONS	Fattony	Fri, 16 July 2004 06:52
	Re: 1g-gte AFM OPTIONS	HKS_TRD	Sat, 17 July 2004 02:36
	Re: 1g-gte AFM OPTIONS	CrAiGzEE	Sat, 17 July 2004 08:17
	Re: 1g-gte AFM OPTIONS	indian	Sun, 18 July 2004 22:44
	Re: 1g-gte AFM OPTIONS	Fattony	Sun, 18 July 2004 08:29
	Re: 1g-gte AFM OPTIONS	EvilJack	Tue, 07 September 2004 01:14
	Re: 1g-gte AFM OPTIONS	indian	Tue, 07 September 2004 01:53
	Re: 1g-gte AFM OPTIONS	MR 1JZ	Tue, 07 September 2004 08:05
	Re: 1g-gte AFM OPTIONS	indian	Tue, 07 September 2004 22:46
	Re: 1g-gte AFM OPTIONS	MR 1JZ	Tue, 07 September 2004 23:36

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