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SVTPerformance's Chain of Restaurants
Tuning À la carte
Some weird PIDs?
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<blockquote data-quote="15PSI" data-source="post: 15208762" data-attributes="member: 175675"><p>Your MAF numbers are measured in Lbs per minute of airflow. Older MAFs translated the air mass into voltages, but newer MAFs employ A/D converters that digitize the voltage output (0-5V) into results the ECU will use in various lookup tables. The numbers will reflect the amount of air mass moving through the MAF based on your engines pumping capability and efficiency. These numbers will change dependent on modifications to your engine. VE is Volumetric Efficiency; the efficiency of the cylinder(s) to fill with air. As was stated, this is Fords 'Load'. VE will exceed 100% with boosted motors, and is normally less with NA motors. Having said that, highly tuned NA motors can exceed 100% - the new 5.2L flatplane engine supposedly has a VE of 110% (ie. It can pump more than 5.2 Liters of air because it benefits from pretty slick resonance tuning). To describe VE another less confusing way is it specifies an engines cylinder filling efficiency by how much AIR MASS enters the engine during the intake cycle compared to the amount of air mass the cylinder could theoretically hold. Dependent on your mods, the output frequency of the MAF could be exceeded by the engines air demands; the MAF would be pegged at it's highest measuring point and would have to be rescaled. LTFT refers to changes in STFT but averaged over a longer period of time. A negative fuel trim percentage indicates a taking away of fuel while a positive percentage indicates an adding of fuel. STFT is referenced by the 02 sensors (HEGOs on the newer Stangs). The numbers you mentioned for your LFTF are normal. If you use LiveLink GEN-II (SCT), look under 'TOOLS' then 'LIST'. You will find code lookup tables for TORQUE, ETC TORQUE and TORQUE DD. And honestly, I know just enough about the TORQUE codes, to know I shouldn't try to explain them. And. finally, try to always think in terms of LAMBDA. LAMBDA will be a value of '1' at Stoich for the type of fuel you are using. e.g. 14.64:1 AFR for pure gasoline would equal '1' Lambda. 11.5:1 AFR (100% Gasoline) would calculate a LAMBDA of .79 (11.5/14.64 = .785).</p></blockquote><p></p>
[QUOTE="15PSI, post: 15208762, member: 175675"] Your MAF numbers are measured in Lbs per minute of airflow. Older MAFs translated the air mass into voltages, but newer MAFs employ A/D converters that digitize the voltage output (0-5V) into results the ECU will use in various lookup tables. The numbers will reflect the amount of air mass moving through the MAF based on your engines pumping capability and efficiency. These numbers will change dependent on modifications to your engine. VE is Volumetric Efficiency; the efficiency of the cylinder(s) to fill with air. As was stated, this is Fords 'Load'. VE will exceed 100% with boosted motors, and is normally less with NA motors. Having said that, highly tuned NA motors can exceed 100% - the new 5.2L flatplane engine supposedly has a VE of 110% (ie. It can pump more than 5.2 Liters of air because it benefits from pretty slick resonance tuning). To describe VE another less confusing way is it specifies an engines cylinder filling efficiency by how much AIR MASS enters the engine during the intake cycle compared to the amount of air mass the cylinder could theoretically hold. Dependent on your mods, the output frequency of the MAF could be exceeded by the engines air demands; the MAF would be pegged at it's highest measuring point and would have to be rescaled. LTFT refers to changes in STFT but averaged over a longer period of time. A negative fuel trim percentage indicates a taking away of fuel while a positive percentage indicates an adding of fuel. STFT is referenced by the 02 sensors (HEGOs on the newer Stangs). The numbers you mentioned for your LFTF are normal. If you use LiveLink GEN-II (SCT), look under 'TOOLS' then 'LIST'. You will find code lookup tables for TORQUE, ETC TORQUE and TORQUE DD. And honestly, I know just enough about the TORQUE codes, to know I shouldn't try to explain them. And. finally, try to always think in terms of LAMBDA. LAMBDA will be a value of '1' at Stoich for the type of fuel you are using. e.g. 14.64:1 AFR for pure gasoline would equal '1' Lambda. 11.5:1 AFR (100% Gasoline) would calculate a LAMBDA of .79 (11.5/14.64 = .785). [/QUOTE]
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Some weird PIDs?
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