Post #3
I use a Performance Box quite extensively. It's great, the video function of a Video VBOX is fantastic too, however, I can't justify the extra £1000 for the feature.
It is of most value when you actually know how to use it, you need to be a fairly competent driver in the first place, then use it to log different lines, braking points etc. From here you can then use Circuit Tools to figure out your 'delta' and find out through analysis the quickest way around the circuit.
Best place for it though is in one car, same day, same circuit with two drivers. One driver WILL be faster than the other, in my case I was the slower driver but in places I was actually faster in some places. Circuit Tools is great for looking at your ideal lap times.
Trackdays though are not the best place for trying datalogging. Firstly it's against the rules (TDs are non timed events, if you're timing then there's a chance you are invalidating the TDO insurance) and secondly, it's nigh on impossible to get a clear lap to 'set a time'.
I use some software called RaceRender2 to 'burn' the GPS data to the video as seen here:
Clicky for Vimeo
There are better and more powerful things out there on the market, but they are priced accordingly and are not as simple to use. That's the great thing about Circuit Tools, it's a piece of p!$$ to use!