Can you convert speed density to mass air on 1987 ford 5.0 mustang?

You can't directly *convert* a Speed Density system to a Mass Airflow (MAF) system on a 1987 Ford 5.0 Mustang. They are fundamentally different methods of measuring air intake. A speed-density system uses manifold pressure, engine speed (RPM), and air temperature to calculate the amount of air entering the engine, while a MAF system uses a sensor to directly measure the mass airflow.

To switch from speed-density to MAF would require a significant modification, involving:

* Replacing the intake system: You'll need a new intake manifold designed for a MAF sensor. The stock speed-density intake won't work.

* Installing a Mass Airflow Sensor (MAF) and housing: This is the core component of the MAF system. The sensor must be appropriately sized for your engine's airflow requirements.

* New computer (ECU): The existing ECU is programmed for speed-density and won't be compatible with a MAF system. You'll need a reprogrammed ECU or an aftermarket standalone ECU that supports MAF.

* Wiring harness modifications: You'll need to wire the MAF sensor to the ECU and potentially make other adjustments to the existing wiring.

* Calibration/Tuning: Even with the correct hardware, you'll need to have the ECU calibrated (tuned) to properly utilize the MAF sensor data. This often requires a professional tuner and a dyno.

In short, it's a major undertaking, far beyond a simple conversion. It's essentially a complete engine management system upgrade. The cost and effort involved would likely exceed the potential benefits for a stock 1987 Mustang 5.0. Consider whether the potential gains justify the expense and complexity. It's far easier to optimize the existing speed-density system before considering such a significant change.