Adding to Keyboard Jockey's point - the track conditions from night to night at the same track and then across multiple tracks make comparison of data pretty difficult.
DIY basic data acquisition is something i've thought about such as mounting air flow sensors to the top wing to measure the difference in speed of the air flowing above the wing versus the air flowing on the underside of the wing. Also mounting a go pro camera on each corner looking at shock movement to adjust rebound, compression, bump rubbers etc. Both of these are relatively accessible to all teams (ebay Anemometer and used GoPro camera) who were interested in that sort of information.
The thread talking about Trey Starks funnel wing has me interested in why they would want to increase velocity of the air above the wing as in theory that is actually reducing downforce on the car by lowering the pressure of the air flowing over the top of the wing. Only my understanding of how to create downforce.
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