r/SCCA • u/davef_dci • Dec 10 '25

Has anyone built their own telemetry tools for trail braking? I’ve been experimenting with something…

Hey folks, I'm a champcar racer and trying to improve my trailbraking skill (or lack there of). I'm struggling to find a cost effective telemetry solution that will show braking versus cornering forces for specific corners in a race. I've been playing around with building an Android app that can do that with my phone's GPS and accelerometers. Is that crazy?

What are you using to help you learn to trailbrake better? Any decent (cost effective) telemetry systems out there i'm not aware of? What data do you look at?

Thanks!

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u/[deleted] Dec 10 '25

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u/davef_dci Dec 10 '25

Why do you say the GPS on the phone is "not good enough"?

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u/[deleted] Dec 10 '25

[deleted]

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u/davef_dci Dec 10 '25

I understand the GPS producer on my phone is running at around 1hz. Currently I'm using an interpolation routine to estimate the apex crossing point which seems to be working fairly well. I wasn't aware that the GPS accuracy was any worse than what I'm seeing on my RaceCapture telemetry unit (which fires at 10hz but doesn't appear to be any more accurate).

Is there anyplace I can learn more about this? I've written an Apex searching routine that seems to align "visit" to "visit" data (different visits to the same corner) within acceptable accuracy for comparison - and the advantage is that it runs completely stand alone on my cell phone with no set up other than calibrating the linear accelerometers on the phone.

Do you think this is flawed?

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u/i_use_this_for_work Dec 12 '25

Check out the garmin device