Coyote 5.0L Engine Contol System & Tuning

[GT Pony]

So why does the Coyote need a "tune" when only the intake system is opened up? I see that it uses a MAF (Mass Air Flow) sensor in the intake tube, so why doesn't the ECM automatically adjust the A/F to the correct level when it's reading higher airflow into the engine at the same throttle opening?

I had a C5 Z06 for years, and I believe you could throw on an aftermarket CAI system and exhaust without worrying about a re-tune because the ECM used the sensor inputs which could tell when more airflow was going into the engine, even at WOT conditions.

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[Khyber]

because it's a set number

 

[GT Pony]

because it's a set number

You mean because the ECM uses fuel and spark maps?

What's the MAF sensor for? MAF sensor along with IAT and MAP sensors are supposed to determine density of the air and the real-time actual volumetric intake to the engine.

 

[Trackaholic]

You mean because the ECM uses fuel and spark maps?

What's the MAF sensor for? MAF sensor along with IAT and MAP sensors are supposed to determine density of the air and the real-time actual volumetric intake to the engine.

MAF only measures the airflow in a small portion of the tube, and the ECU uses the sensor info to calculate overall airflow based on the intake diameter and flow properties that were tested by Ford.

If you change the intake diameter or flow characteristics (direction, amount of turbulence, etc.), the MAF will still measure the flow in the area it is located in, but the overall air moving through the tube has changed. The airflow calculations based on the MAF signal are no longer correct. The tune is basically resetting the conversion factor so the computer will once again calculate the correct amount of overall air based on the MAF signal.

-T

 

[Nick@JDM]

MAF only measures the airflow in a small portion of the tube, and the ECU uses the sensor info to calculate overall airflow based on the intake diameter and flow properties that were tested by Ford.

If you change the intake diameter or flow characteristics (direction, amount of turbulence, etc.), the MAF will still measure the flow in the area it is located in, but the overall air moving through the tube has changed. The airflow calculations based on the MAF signal are no longer correct. The tune is basically resetting the conversion factor so the computer will once again calculate the correct amount of overall air based on the MAF signal.

-T

Well said. :clap2:

A larger housing (such as on the JLT) will need calibration to keep the fuel trims in check. The PCM will adjust fueling accordingly and correct any error but it will be way out of acceptable spec and could throw a CEL if the correction factor is too great.

 

[GT Pony]

So is the MAF sensor the one just inside the intake tube after the air filter? I was thinking that was the air temperature sensor (AIT). Is the AIT sensor deeper down inside the intake manifold?

 

[Grimace427]

So is the MAF sensor the one just inside the intake tube after the air filter? I was thinking that was the air temperature sensor (AIT). Is the AIT sensor deeper down inside the intake manifold?

The MAF also measures IAT.

 

[craigsix]

bbk does alot of testing with stock tune.

 

[jasonstang]

You need a tune when the intake diameter is different.

 

[Higgs Boson]

;)

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