Thanks Greg. Yeah, as you know hard data is paramount when you are trying to figure out what is happening.
Basically you only need a stopwatch to realize that the correlation between what you think is fast and what really is fast hovers around zero.
Next step is to get some software that creates a virtual dash to overlay on my videos, that will be interesting. Get one of those g-bungycord-diagrams as thay have in the F1 broadcasts and tach/speedo.
I was a bit suprised to see in my logs that my speed at Kinnekulle when I turn in under the bridge on the straight is actually over 160Km/h, I was quite certain it wasn't over 140Km/h (remember, I didn't have a tach until recently).
About the plots in my first post, the idea is to use
all the available grip during the transition from braking to cornering, ideally you want the plot to follow one of the circles. For instance, if I can brake and corner at 1.2g the plot should go from full brake, follow the circle to 1.2g at full cornering. That means that you will have to release the brakes at a perfect rate during the turn-in, not an easy task (but the F1 drivers seem to be able to nail it every turn...)
The tracks we drive are seldom just corners with a straight leading up to it though, usually there are a lot of stuff going on at the same time and that's why you can see strange loops from when I brake in a long corner for instance.
The "weirdness" in the last graph is from a lap where I actually go from the left hander under the bridge to the loong right hander without going straight in between, the braking have to be squeezed in there somewhere and that's why you see the large hump with the little twist on it.