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I've had students compare their 5hz HLT plots to the plot collected by an AIM or Racepak, and they're often shocked at the results.
Additionally, HLT unfortunately is often limited by the questionable quality of many GPS and OBD2 scanners out there.
Compared to a dedicated setup like the AIM, there is, unfortunately, no comparison. For instructional purposes, just standard PIDs are not enough, whereas with a car-specific data logger, I can use all of the OBD2 output to 1. show the student what they actually did (they can't deny the data), and 2. what the results were.
HLT is great for the price point, but keep in mind that if you add your own external GPS and OBD2 readers, you're already spending quite a bit of money. While the phone itself is a sunk cost, it's still an expense.
IMO, the single biggest strength of HLT is the built-in overlay feature, so that you can watch your own video n the fly.
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