Getting to know Ford
Here we will go over a few of the basic details and terminologies that are specific to Ford before we begin tuning on a COBB Accessport equipped Ford Ecoboost vehicle.
MAP Based – These vehicles use a MAP based airflow system. This is also known as Speed Density. While some Ecoboost vehicles do have a MAF sensor in place, it is not used for airflow calculations.
Throttle Closures – The primary method of controlling torque on these cars is done with the assistance of the drive-by-wire throttle system (factory tune). The factory tune allows the throttle to close to less than 20% (of the 82% max) which can result in extremely consistent torque delivery, but neutered performance. There are two main offenders that will result in throttle closures: Load and Boost. We recommend adjusting these limits higher to take full control of the throttle. See our OTS maps for effective examples.
Fuel Control – Ecoboost engines operate in a constant closed-loop state, constantly utilizing the A/F values in its tables and making adjustments via its equipped wide-band O2 sensor. While certain tables are marked as "Open Loop", they are labeled as such to distinguish the difference between stoichiometric operation and air fuel targets during power enrichment (such as wide open throttle).
Boost Control – These vehicles do not directly target boost in stock form but rather engine torque. Engine torque is calculated based on numerous variables such as: pedal position, air flow, boost and RPM.
Ignition Control – The Ford ECU has an incredibly complex timing strategy. It consists of four primary methods to control spark: MBT, Borderline, Cylinder Pressure, and Pre-Ignition. The ECU also allows full dynamic advance and retard based on octane learning and knock sensor feedback. There are up to 16 primary tables for each method, along with accompanying compensations. All of these must be touched to produce desired results. To see a good example of an effective timing strategy, compare and contrast a few of our various OTS maps.
"5D" 3D Tables – The Ford ECU uses a new style of 2D axes in select 3D tables. In these tables both the X and Y axis have "paired" data. On tables that would require it, we have broken these out for editing in separate folders. The axes are generally index based and may require manipulation to both the index and/or the data to properly display graphs or to utilize greater breakpoint resolution.
Over-temp Conditions – There are numerous watchdogs in the ECU that can put the car into an over-temp mode. During this mode, additional fuel is injected in an attempt to cool the car down and bring conditions back to normal. This will result in poor performance and use excessive fuel. Care should be taken to adjust these temperatures with the appropriate sensors in place to ensure optimal power delivery and engine safety are achieved.