Are these MAF housing calculations correct?

PSmalls::DoggieStyle · 08-26-2004, 12:44 PM

Stock MAF is 73mm so the area is Pi*36.5^2?

85mm MAF would be Pi*42.5^2,88mm MAF would be Pi*44^2, and 90mm would be Pi*45^2?

So a 85mm MAF would be ~1.356 times bigger, a 88mm MAF would be ~1.453, a 90mm maf is ~1.52 times bigger?

If this is accurate, Mike2kS4 flowing ~275 g/s with the 88mm housing is equivalent to flowing ~400 g/s with the stock housing?

And IIRC, Verruckt is flowing ~285 g/s with his 85mm housing. This would be equivalent to flowing ~385 g/s with the stock housing?

Any input would be appreciated. A few of us AW'ers have been discussing this for a while now, so I decided to share and get some comments. Thanks, guys. If I'm way off, be nice about correcting me

Imolavirus@BuehnEngineering · 08-26-2004, 12:47 PM

No More B5 S4 · 08-26-2004, 12:48 PM

Imolavirus@BuehnEngineering · 08-26-2004, 12:50 PM

using doc's theory....

73=4185.4mm^2
83=5410.3mm^2
85=5674.5mm^2
88=6082.1mm^2
90=6361.7mm^2

Mike2kS4 · 08-26-2004, 12:51 PM

PSmalls::DoggieStyle · 08-26-2004, 12:52 PM

HAARP project · 08-26-2004, 12:53 PM

PSmalls::DoggieStyle · 08-26-2004, 12:53 PM

RS4 housing is 83mm. Area is Pi*41.5^2. The ratio of RS4 to S4 is ~1.3?

PSmalls::DoggieStyle · 08-26-2004, 12:54 PM

Mike2kS4 · 08-26-2004, 12:54 PM

I doubt I'd get even half the variables in the flow computations.

08-26-2004, 12:44 PM	#1
PSmalls::DoggieStyle Elder Member Garage is empty, add now Join Date: Jan 2004 Posts: 30,257	Are these MAF housing calculations correct? Stock MAF is 73mm so the area is Pi36.5^2? 85mm MAF would be Pi42.5^2,88mm MAF would be Pi44^2, and 90mm would be Pi45^2? So a 85mm MAF would be ~1.356 times bigger, a 88mm MAF would be ~1.453, a 90mm maf is ~1.52 times bigger? If this is accurate, Mike2kS4 flowing ~275 g/s with the 88mm housing is equivalent to flowing ~400 g/s with the stock housing? And IIRC, Verruckt is flowing ~285 g/s with his 85mm housing. This would be equivalent to flowing ~385 g/s with the stock housing? Any input would be appreciated. A few of us AW'ers have been discussing this for a while now, so I decided to share and get some comments. Thanks, guys. If I'm way off, be nice about correcting me

08-26-2004, 12:47 PM	#2
Imolavirus@BuehnEngineering AudiWorld Super User Garage is empty, add now Join Date: Mar 2002 Posts: 17,943	Mike2ks4....what do you think? __________________ -Jacob ^^^CLICK SIG FOR BUEHN ENGINEERING WEBSITE^^^ <big><big>Website Here!!!</big></big> <big>Items For Sale</big>

08-26-2004, 12:48 PM	#3
No More B5 S4 Elder Member Garage is empty, add now Join Date: Aug 2002 Posts: 30,761	I think...I got a headache. :-P __________________ --------------------------------------------------------- "The Lord be with your spirit. Grace be with you." -2 Timothy 4:22 Click for Peer FATS Times. Updated: 03/15/05<a href="http://public.fotki.com/s4madman/scenerylandscape/wallpapers_1600x1200/"> Got Wallpapers? Updated: 10/29/04</a> The AW Database. Updated: 02/15/05

08-26-2004, 12:50 PM	#4
Imolavirus@BuehnEngineering AudiWorld Super User Garage is empty, add now Join Date: Mar 2002 Posts: 17,943	here are the "areas" of each MAF size...... using doc's theory.... 73=4185.4mm^2 83=5410.3mm^2 85=5674.5mm^2 88=6082.1mm^2 90=6361.7mm^2 __________________ -Jacob ^^^CLICK SIG FOR BUEHN ENGINEERING WEBSITE^^^ <big><big>Website Here!!!</big></big> <big>Items For Sale</big>

08-26-2004, 12:51 PM	#5
Mike2kS4 AudiWorld Super User Garage is empty, add now Join Date: Jun 2002 Posts: 12,096	The math is a bit more complicated than that for flow, but you're definitely in the ballpark. __________________ 2002 S4 Avant, 6spd. Bone stock. <a href="http://www.autospeed.us"> </a> Caveat: Any advice I express regarding potential tuning and such is purely informational. If your knowledge and abilities are not up to the task, no amount of advice can assist.

08-26-2004, 12:52 PM	#6
PSmalls::DoggieStyle Elder Member Garage is empty, add now Join Date: Jan 2004 Posts: 30,257	Sweet, at least we aren't totally off base ;p

08-26-2004, 12:53 PM	#7
HAARP project New Member Garage is empty, add now Join Date: Aug 2004 Posts: 53	my 95mm is the king :)

08-26-2004, 12:53 PM	#8
PSmalls::DoggieStyle Elder Member Garage is empty, add now Join Date: Jan 2004 Posts: 30,257	Oh yeah, forgot the RS4 housing in my post. RS4 housing is 83mm. Area is Pi*41.5^2. The ratio of RS4 to S4 is ~1.3?

08-26-2004, 12:54 PM	#9
PSmalls::DoggieStyle Elder Member Garage is empty, add now Join Date: Jan 2004 Posts: 30,257	Or not ;p

08-26-2004, 12:54 PM	#10
Mike2kS4 AudiWorld Super User Garage is empty, add now Join Date: Jun 2002 Posts: 12,096	Is there a Computational Fluid Dynamicist in the house? I doubt I'd get even half the variables in the flow computations. __________________ 2002 S4 Avant, 6spd. Bone stock. <a href="http://www.autospeed.us"> </a> Caveat: Any advice I express regarding potential tuning and such is purely informational. If your knowledge and abilities are not up to the task, no amount of advice can assist.

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