TPITuned Port Injection discussion and questions. LB9 and L98 tech, porting, tuning, and bolt-on aftermarket products.
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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?
__________________ '87 Monte Carlo SS,with '89 IROC 350,700 trans, blew up 3.73 posi stuck with crappy 2.73's neeed gears! hooker headers, flowmaster 2 1/2" exhaust true dualls, alum vette heads 58cc, 1.6 RR's and RCR's SLP runner, plenum and base all highly ported.
Look cool go fast.
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.
__________________ 1987 GTA / Miniram'd 383/ TH700R4 3000RPM stall / 9" w/4.33s : Far from stock, far from done.... Link to the GTA
1999 Trans Am / LS1 / T56 : Patriot Heads and Cam, the usual bolt ons... Link to the Trans Am
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.
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.
We are talking MAT (Manifold Air Temperature) not MAF (Mass Airflow Sensor).
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?
AFAIK - that is correct
For MAF cars the MAT is only used to determine the temp at which the EGR can be used.
Tim
__________________ 2005 Subaru STi, Got RlCE?
My old 11 second 1990 IROC-Z (sold to TGO Member 92 Formula)
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...
