Race-Tech DL1 Data Logger. 30 November 2004.

Screen-shot showing Race-Tech’s data logger analysis software. This is a sample showing one corner (a back-road leading onto a small dead-end road). On the right is the layout of the corner, starting from where the dot is and progressing to the left. On the left is a G/G plot of that corner. Longitudinal acceleration is on the Y axis and lateral acceleration on the X axis. The plot starts in the centre close to 0/0. The “straight” road has a slight left kink to it and you can see that I start with a lateral acceleration of 0.08 G. I straighten the car up (going to 0 G lateral) and brake hard going immediately back to 0.08 G lateral and down to 0.6 G braking (ok, this is a Buick .. no jokes please). The little jiggle at the bottom is probably me trying to make sure I hit my turn-in point. I keep the brakes on as I turn in, getting off them as the side load increases. At 0.6G lateral I am completely off the brakes. That little wiggle on the left is the moment when I’m moving from the brake peddle to the throttle (and proof that there is an advantage to left-foot braking). Finally the corner is over and I am back on the throttle taking it up to 0.2 G acceleration.

What amazes me is the incredible detail on just this one corner. The total length of this sample is 8.5 seconds.

G/G plot. On the way to lunch today. Cold summer tyres, cold day (-3ºC). 0.86 G lateral.

Same corner. This time data shown over time. Green, speed in MPH. Black, longitudinal acceleration. Red, lateral acceleration. The early braking was due to traffic.

G/G graph or friction circle. 2000 Audi S4 on about 2/3rd worn studded Nokian Hakkapeliitta 2 tyres in 2-3 inches of fresh or packed snow. -3ºC. Connecticut, USA, 27 December 2004.

A G/G plot or friction circle for Falco's Porsche 996 GT3 lapping the Nürburgring. The data for this was collected with a DL1 this summer.

Image of track layout showing a doubling back of the track where none actually exists.

Track map produced by Race Tech DL1 using 5.1.6 Analysis software on route from Mansfield to Hartford, Connecticut, USA (approx. 29 miles).

Track map produced by Race Tech DL1 using 5.1.6 Analysis software on route from Hartford to Mansfield, Connecticut, USA (approx. 29 miles).