The Aim Solo DL is a really good starter system. It plugs into your ecu to give you a ton of read outs. Have an instructor do a few laps in your car to set some good data to compare your own to.
You can analyze inputs such as throttle/brake inputs, steering input, gps location, etc. There's a lot more to going fast than watching a laptimer.
However, don't bother until you have done about 3-5 track day events. Up until then, you'll just be getting comfortable driving the car at speed. Having any type of data system, such as a laptimer display or what I described above will just be a distraction right now.
There are also other systems, such as the DL1, which I am not terribly familiar with.
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