how much does the MAT sensor control fuel mixture?
05-02-2002, 11:47 AM
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Car: 87 Monte Carlo SS
Engine: 89 IROC 350 TPI
Transmission: 700R4 rebuilt w/TCI kit
Axle/Gears: 9" from 57 ranchero unsure gears.
how much does the MAT sensor control fuel mixture?
Just wondering how much does the MAT actually control the fuel mixture, and also was wondering on a MAF car does it really matter that much to change it to the newer style LT1 MAT thats in the air cleaner?
05-02-2002, 12:07 PM
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Car: 04 GTO
Engine: LS1
Transmission: M12 T56
From everything that the gurus can find so far, the MAT does not control fueling at all in MAF cars.
In SD it is used as part of the VE calcs
In SD it is used as part of the VE calcs
05-02-2002, 02:59 PM
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Car: 87 Monte Carlo SS
Engine: 89 IROC 350 TPI
Transmission: 700R4 rebuilt w/TCI kit
Axle/Gears: 9" from 57 ranchero unsure gears.
Then what does it control or do other than send the info to the computer?
05-03-2002, 01:29 AM
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Car: 1987 Trans Am GTA
Engine: Miniram'd 383, 24X LS1 PCM
Transmission: TH700R4, 4200 stall
Axle/Gears: 9", 4.33:1
Supposedly, on MAF cars, the sensor is downstream of the EGR outlet and tells the ECM if the EGR is operating or not by sensing a change in the intake air temp (hotter) when/if the EGR system operates as designed and intended.
05-03-2002, 01:58 AM
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Mass airflow sensors are the most accurate way to determine load on an engine due to air's elasticity when heated and cooled. The ECM uses this data along with the rpm to determine a fuel injection pulse width. The OXYGEN sensor is used as an auditor to trim the fuel ratio. Hope this helps.
05-03-2002, 02:16 AM
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Car: 1987 Trans Am GTA
Engine: Miniram'd 383, 24X LS1 PCM
Transmission: TH700R4, 4200 stall
Axle/Gears: 9", 4.33:1
Originally posted by transam421
Mass airflow sensors are the most accurate way to determine load on an engine due to air's elasticity when heated and cooled. The ECM uses this data along with the rpm to determine a fuel injection pulse width. The OXYGEN sensor is used as an auditor to trim the fuel ratio. Hope this helps.
Mass airflow sensors are the most accurate way to determine load on an engine due to air's elasticity when heated and cooled. The ECM uses this data along with the rpm to determine a fuel injection pulse width. The OXYGEN sensor is used as an auditor to trim the fuel ratio. Hope this helps.
05-03-2002, 09:06 AM
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Car: 87 Monte Carlo SS
Engine: 89 IROC 350 TPI
Transmission: 700R4 rebuilt w/TCI kit
Axle/Gears: 9" from 57 ranchero unsure gears.
ok so then since I have the vette alum heads with no EGR passages the MAT is useless? other than to throw a code if it goes out?
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05-03-2002, 09:24 AM
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Car: 2005 Subaru STI
Engine: 153ci of Turbo Power!
Transmission: 6-Speed
Originally posted by monte-ss
ok so then since I have the vette alum heads with no EGR passages the MAT is useless? other than to throw a code if it goes out?
ok so then since I have the vette alum heads with no EGR passages the MAT is useless? other than to throw a code if it goes out?
For MAF cars the MAT is only used to determine the temp at which the EGR can be used.
Tim
05-03-2002, 12:44 PM
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Car: 04 GTO
Engine: LS1
Transmission: M12 T56
As far as we know, yes, a relocated MAT on a MAF car does nothing for you. So far noone has found any code that uses the MAT for fuel in the MAF bin, nor has anyone shown scantool data to suggest that a relocated MAT changes fueling.
SD definitely uses the MAT for fuel calculations, i was just reading the routines the other night...
SD definitely uses the MAT for fuel calculations, i was just reading the routines the other night...
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