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YelloRolla Forums Junkie Location: On your mum! Registered: May 2002	Re: t28 boost Wed, 23 February 2005 07:00 ke35 - 4AGZE wrote on Wed, 23 February 2005 14:57 ok then what else will affect the efficiency of the turbo?? yeah i am using it on a 4age, but what else will effect the airflow : pressure ratio?? if thats what ur talking about? wat do u think would be the pressure output of the t28 at peak efficiency and when will it be made?? And so it begins that I wonder why I bothered replying in the first instance. The pressure ratio/airflow peak efficiency covers quite an area of any given compressor map (ideally you will cut a line right through the middle of the peak efficiency island). Pressure ratio = pressure abs + boost/pressure abs. Where pressure abs = 14.7 and boost = 14.7 psi the answer will be a pressure ratio of 2. Now if you shove a restrictive filter (say 2psi pressure drop) and a restrictive intercooler (say 3 psi drop) your pressure ratio (to achive 14.7psi manifold pressure) will now = edit/2.55 and in-turn your turbo will need to spin about edit/22.5% harder to achieve the desired boost - figure another 35,000 rpm shaft speed (based on a base shaft speed of 200,000rpm). This is what will hurt the turbo. As far as your T28 is concerned? I don't have the comp map for it so I cannot determine it's suitability. none of which was the intended point to mentioning this in the the first instance. Rather that there is more to it than just 17psi! edited due to late night realisation that I frigged up the math. [Updated on: Wed, 23 February 2005 13:03] [Report message to a moderator]

	Subject	Poster	Date
	t28 boost	ke35 - 4AGZE	Mon, 21 February 2005 03:53
	Re: t28 boost	cramet	Mon, 21 February 2005 06:17
	Re: t28 boost	4agte	Mon, 21 February 2005 07:31
	Re: t28 boost	NVD05X	Mon, 21 February 2005 08:51
	Re: t28 boost	ke35 - 4AGZE	Mon, 21 February 2005 08:38
	Re: t28 boost	ke35 - 4AGZE	Mon, 21 February 2005 09:26
	Re: t28 boost	TE72_Turbo	Mon, 21 February 2005 10:24
	Re: t28 boost	fatmr2	Mon, 21 February 2005 10:56
	Re: t28 boost	4agte	Mon, 21 February 2005 11:06
	Re: t28 boost	ke35 - 4AGZE	Tue, 22 February 2005 20:04
	Re: t28 boost	nabs478	Wed, 23 February 2005 01:50
	Re: t28 boost	YelloRolla	Wed, 23 February 2005 02:03
	Re: t28 boost	4agte	Wed, 23 February 2005 07:42
	Re: t28 boost	NVD05X	Wed, 23 February 2005 12:48
	Re: t28 boost	4agte	Wed, 23 February 2005 12:54
	Re: t28 boost	ke35 - 4AGZE	Wed, 23 February 2005 03:57
	Re: t28 boost	YelloRolla	Wed, 23 February 2005 07:00
	Re: t28 boost	NVD05X	Wed, 23 February 2005 13:29
	Re: t28 boost	ke35 - 4AGZE	Thu, 24 February 2005 06:59
	Re: t28 boost	NVD05X	Thu, 24 February 2005 09:34
	Re: t28 boost	Allan	Thu, 24 February 2005 09:43
	Re: t28 boost	NVD05X	Thu, 24 February 2005 09:46
	Re: t28 boost	TE72_Turbo	Thu, 24 February 2005 10:47
	Re: t28 boost	ke35 - 4AGZE	Thu, 24 February 2005 20:04
	Re: t28 boost	Allan	Sat, 23 April 2005 13:19
	Re: t28 boost	EldarO	Sun, 24 April 2005 16:36

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