Debunking the S650 Acceleration Timers & Track Apps

[Zig]

For my own insight, I was curious what Ford was using in these apps as a reference for movement.

When Ford initially rolled out Track Apps in 2012, the reference source for movement was an internal accelerometer. I'm also finding posts discussing this reference as well.

https://www.motortrend.com/news/video-find-ford-shows-off-mustangs-track-apps-181097/

Interestingly, Ford began installing GPS as far back at 2007.

https://themustangsource.com/forums/f730/mustang-factory-gps-446140/

In the S550 and S650, the roof-mount shark fin antenna is the car's GPS receiver. In the S550, the receiver is connected to Accessory Protocol Interface Module (APIM), which is itself attached to the backside of the center console screen. I couldn't readily confirm if the APIM moved in the S650 to support the updated interior.

From several searches, it appears Ford never changed their reference. It seems Ford vehicles continue to use an internal accelerometer. While GPS is readily available, the received civilian signal more accurate than previous generations, Ford is not relying on it.

Edit,

For the physical part of the equation, which will have higher resolution: Ford's accelerometer or received GPS? I cannot answer that.

For the logical formulas, as others have asked, what is Ford's math? I'd be curious. But I wouldn't expect Ford to offer deeper insight.

Does placement impact results? Ie, inside trunk vs atop dashpad.

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[Skye]

Does placement impact results? Ie, inside trunk vs atop dashpad.

It could. I found some references in Porsche forums, people doing deep dives on where placed and how oriented, so as to get the most accurate readings. But these were folks tracking consistently. People who had dedicated track cars.

IMO, companies selling dedicated software, hardware and systems are going to be more accurate than manufacturer in-car results. Many aftermarket vendors even tout their development time on the algorithms alone.

Personally, I would not rely on the Ford app. It's nice and all, but Ford's main motive isn't making the best track recording systems or applications, but selling the most-profitable Mustang.

I'd always accept the results from the organization supporting those races or venues. The NHRA has a standard used at their tracks for every vehicle. For others, the FIA is at least one body that publishes their standard, each team and car using the same devices and software.

YMMV.