MAF conversion on my s4???
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Junior Member
Joined: Jun 2005
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From: Canton, N.Y.
MAF conversion on my s4???
I was wondering if anybody knows or has converted the s4 air flow meter to an s5 mass air meter. If so, how did you do it? or is there a write up on how to somewhere ?
Former Moderator. RIP Icemark.
Joined: Apr 2001
Posts: 25,896
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From: Rohnert Park CA
Originally Posted by soontoBdrifting
I was wondering if anybody knows or has converted the s4 air flow meter to an s5 mass air meter. If so, how did you do it? or is there a write up on how to somewhere ?
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Rotorhead
Joined: Feb 2001
Posts: 9,136
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From: Charlottesville, Virginia, USA
Originally Posted by Icemark
why bother? there is no gain in power. Point less mod
Originally Posted by drago86
Arn't they both technically AFM's? no point.
HAILERS
Joined: May 2001
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From: FORT WORTH, TEXAS,USA
***The point is for people with busy hands and little money to have a sense of accomplishment, even if they didn't really accomplish anything significant. *******
Hey! Quit talking about me! Gotta go now. I've gotta get busy on my Roots supercharger project.
Hey! Quit talking about me! Gotta go now. I've gotta get busy on my Roots supercharger project.
Strength and Honor
Joined: Apr 2006
Posts: 391
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From: CA bay area
I believe the van-type AFM is based on air volume rate, and it's up to the ECU to calculate mass airflow rate with the intake air temperature sensor and atmospheric pressure sensor. MAF sensors (i.e. hot-wire) are based directly off of mass airflow rate (hence the mass airflow name), and require only correction by the ECU to get the mass airflow needed for EFI calculations. MAP sensors are based on manifold pressure, and require temperature sensors for the ECU to calculate mass airflow rate.
Like Aaron said though, the two AFMs will probably have very different airflow-to-voltage curves, so the ECU will add fuel based on the wrong air mass. You can correct this with an SAFC in conversion mode, or one of these puppies (I made it to convert from AFM to MAF):
http://howto.globalvicinity.com/gv_w...=120&co=1&vi=1
Like Aaron said though, the two AFMs will probably have very different airflow-to-voltage curves, so the ECU will add fuel based on the wrong air mass. You can correct this with an SAFC in conversion mode, or one of these puppies (I made it to convert from AFM to MAF):
http://howto.globalvicinity.com/gv_w...=120&co=1&vi=1
Originally Posted by stevej88na
I believe the van-type AFM is based on air volume rate, and it's up to the ECU to calculate mass airflow rate with the intake air temperature sensor and atmospheric pressure sensor. MAF sensors (i.e. hot-wire) are based directly off of mass airflow rate (hence the mass airflow name), and require only correction by the ECU to get the mass airflow needed for EFI calculations. MAP sensors are based on manifold pressure, and require temperature sensors for the ECU to calculate mass airflow rate.
Like Aaron said though, the two AFMs will probably have very different airflow-to-voltage curves, so the ECU will add fuel based on the wrong air mass. You can correct this with an SAFC in conversion mode, or one of these puppies (I made it to convert from AFM to MAF):
http://howto.globalvicinity.com/gv_w...=120&co=1&vi=1
Like Aaron said though, the two AFMs will probably have very different airflow-to-voltage curves, so the ECU will add fuel based on the wrong air mass. You can correct this with an SAFC in conversion mode, or one of these puppies (I made it to convert from AFM to MAF):
http://howto.globalvicinity.com/gv_w...=120&co=1&vi=1
Strength and Honor
Joined: Apr 2006
Posts: 391
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From: CA bay area
Yeah, progress on the display is taking longer than expected. I'm writing the PC software that lets you upload/download data, and I didn't expect Sun to no longer support RS-232 for Windows, and I just got Java working with serial again last night. I'll get back to the MAF swap soon!
