Subject	Go figure
Posted by	-Grimm- on September 27, 2013 at 10:58 AM
	This message has been viewed 232 times.
In Reply To	Most cars are designed with them at atmospheric pressure posted by -Grimm- on September 27, 2013 at 09:32 AM
Message	After some calculations... Assumptions: Before turbo: 80F, 14.696 psia (1 atm) After turbo/intercooler: 120F, 34.696 psia (2.36 atm) Before the turbo you have lower temp, lower pressure, higher velocity air. After the turbo you have higher temp, higher pressure, lower velocity air. The convection coefficient of air in the two states differs only slightly. Warmer, compressed, lower velocity air removes in the area of 53% more heat (from the MAF sensor). From the RPM range of 2000-7500 RPM the max difference (calculated) is 54.1%, minimum 53.1% Unfortunately pressure has a large effect on it. The differences at 24.7 psia are 27.5-28.8% So in order to work the correction circuitry must also have a pressure transducer to correct to the pressure also. I can make the circuit, who wants to give it a shot? :)
Follow Ups	Theoretical: Why not put MAF after the turbo? - -Grimm- 17:33:04 09/26/13 One thought - part would probably require more - jzack 18:24:55 09/26/13 Re: Theoretical: Why not put MAF after the turbo? - 300ZMang 18:36:17 09/26/13 Most cars are designed with them at atmospheric pressure - -Grimm- 09:32:00 09/27/13 Go figure - -Grimm- 10:58:06 09/27/13 if you consider that the MAF measures mass flow - aliaZ 18:33:36 09/27/13 The method the MAF uses to monitor air flow - -Grimm- 19:16:23 09/28/13 hmm...after the intercooler would be best in my opinion - inf 23:32:50 09/26/13 That's what I would think - -Grimm- 13:01:34 09/27/13 The purpose of the MAF is not to measure air intake temp. - Dark Diver 06:49:44 09/28/13 Because after the turbo air is hotter and so has greater - Dark Diver 06:54:22 09/28/13 air after the turbo is actually much slower - aliaZ 16:16:58 09/28/13
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