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Tam Lin
Joined: 17 Dec 2008
Posts: 15
Location: Near London, Great Britain
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 Posted: Wed Sep 15, 2010 10:58 pm Post subject: Got a MAF? Then you need one of these.. |
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My 924S has a 944S2 3 L motor, and since about May, a Vitesse MAF with piggyback. The reason for the MAF was primarily to improve low end response, which I felt was lacking with the OEM AFM.
One of the issues with MAFs is that they are very sensitive to turbulence, and prefer to see about a foot of pipe before e.g. a K&N filter install. With a LARGE filter behind the light bucket, that was just not going to happen.
After MAF ibnstall, I had surging from low speed, but a much improved top end: Not at all what I expected beforehand!
I did some research, and came across this: http://www.saxonpc.com/100mm-cells-for-100.html It's cheap, and the delivery service received from them was excellent, given I'm in the UK. Result: No more surging.
I have no connection to them whatsoever, but if you've got a MAF without a decent propper large filter chamber, I hope this solution helps.. |
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flosho
Joined: 01 Jul 2004
Posts: 3160
Location: Eau Claire, Wisconsin
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| Posted: Wed Sep 15, 2010 11:21 pm Post subject: |
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The 2.0L do not use an MAF FYI.
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[This Space For Rent] |
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Min
Joined: 04 Nov 2002
Posts: 2368
Location: Vernon, British Columbia, Canada
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| Posted: Wed Sep 15, 2010 11:55 pm Post subject: |
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I find this information useful, thank you for posting it 
Min
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Custom means it didn't come from a box.
1980 n/a with EDIS and Megasquirt II Injection. 7 different colors and counting. |
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Rasta Monsta
Joined: 12 Jul 2006
Posts: 11733
Location: PacNW
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| Posted: Thu Sep 16, 2010 12:12 am Post subject: |
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| flosho wrote: | | The 2.0L do not use an MAF FYI. |
Yeah, and neither does my lawnmower. FYI.
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Toofah King Bad
- WeiBe (1987 924S 2.5t) - 931 S3
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ic932
Joined: 11 Feb 2005
Posts: 1104
Location: UK
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| Posted: Thu Sep 23, 2010 12:42 am Post subject: |
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| Min wrote: | I find this information useful, thank you for posting it
Min |
Yeah me too, cheers for sharing.
flosho wrote:
The 2.0L do not use an MAF FYI.
Yeah but the 2.5S model could do, and therefore this is sound performance related info. |
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Rich H
Joined: 10 Jun 2007
Posts: 2665
Location: Preston, Lancs, UK
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| Posted: Thu Sep 23, 2010 12:48 am Post subject: |
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Interesting stuff...
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1994 Lotus Esprit S4 - Work in progress...
1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec |
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trey3670
Joined: 12 Aug 2010
Posts: 17
Location: greeley co
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| Posted: Wed Nov 03, 2010 1:10 am Post subject: |
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| where do you mount this thing? inside the mass airflow sensor? so after the filter? |
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924RACR
Joined: 29 Jul 2001
Posts: 9075
Location: Royal Oak, MI, USA
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| Posted: Wed Nov 03, 2010 2:53 am Post subject: |
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Wow, that makes a lot of sense, very cool, thanks for posting!
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Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype |
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bnoon
Joined: 12 Oct 2009
Posts: 607
Location: West Des Moines, IA USA
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| Posted: Sun Nov 07, 2010 12:27 am Post subject: |
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| trey3670 wrote: | | where do you mount this thing? inside the mass airflow sensor? so after the filter? |
You mount it in the MAF tubing right before the actual sensor. The cells straighten air flow for more accurate MAF thermal transfer. This is an advantage at low speeds where air turbulence can cause the MAF readings to be all over the place (which causes ECU fuel demand to be all over the place). It's really a fuel saver and performance mod all in one for cars without honecomb cells in their MAF stock, especially custom installs.
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'80 924 Turbo - SOLD!
1986 Porsche 944 Turbo - SOLD!
Porscheless  |
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Martijnus
Joined: 29 Dec 2006
Posts: 2019
Location: Netherlands
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| Posted: Sun Nov 07, 2010 2:08 am Post subject: |
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I like this info too.
Not that I'm using a MAF, but i could... and this seems sensible.
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"Rule: Turbo's make torque, and torque makes fun." (C. Bell)
924 "50-jahre", 1981.
MSII/extra, LPG, ITB's, 5lug.
To be turbo'ed in a while.
Killed her at the Nurburgring, Porscheless at the moment |
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