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Joined: Jun 2013
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dann28
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dann28 Jun 14, 9:23pm - #449403 
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Joined: Jun 2013
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tn
Maf Sensor Location

I was wondering why is the Maf Sensor located close to the throttle body on 2003 celicas. Is there a performance gain or what?
Joined: May 2002
Posts: 421
CaffeineKid
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CaffeineKid Jun 14, 11:57pm - #449404 

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2008 Scion tC

Joined: May 2002
Posts: 421
California
The throttle body and mass ar flow (MAF) sensor go hand-in-hand:

Quote:
A mass air flow sensor is used to find out the mass flowrate of air entering a fuel-injected internal combustion engine. The air mass information is necessary for the engine control unit (ECU) to balance and deliver the correct fuel mass to the engine. Air changes its density as it expands and contracts with temperature and pressure. In automotive applications, air density varies with the ambient temperature, altitude and the use of forced induction, which means that mass flow sensors are more appropriate than volumetric flow sensors for determining the quantity of intake air in each piston stroke.

SOURCE: http://en.wikipedia.org/wiki/Mass_flow_sensor

This is why they are next to each other.

TLDR / VERY BASICALLY put:
AIR FLOW > Air Filter > Intake PIPE/TUBE (or STOCK AIR BOX) > MAF > THROTTLE BODY > FUEL INJECTORS, SPARK PLUGS and other ENGINE "STUFF"

Linked Image
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dann28
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dann28 Jun 15, 1:14am - #449405 
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tn
Yes I know that what I was meaning is why is it moved closer to the throttle body on Injen and AEM Intakes.Instead of the original location in front of the air box
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CaffeineKid
CelicaSpecialist
CaffeineKid Jun 15, 4:39am - #449407 

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2008 Scion tC

Joined: May 2002
Posts: 421
California
There really are not too many other good mounting locations on an aluminum Intake system.

The same rational could be said about mounting to the stock plastic air-box (which is solid) VS mounting on the flexible rubber fitting:
Linked Image

On the Blitz SUS Short Ram Intake, it's also mounted to a secure location:
Linked Image

AEM CAI MAF sensor mount location is here:
Linked Image

Injen CAI MAF sensor mount location is here:
Linked Image

I see the mount location is more of an attachment-type of detail, than anything else. And obviously, someone specialized in aerodynamics (as related to air flow temperatures) would know more about this smile
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dann28
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dann28 Jun 15, 11:10am - #449409 
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tn
yea your right I just thought there was some performance gains to be had by putting the maf closer to the the throttle body vs at the end of the filter.thanks for the response.
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