Hi, I'm new here. I've have just started to use Rachchrono with a QStarz 818x 5Hz with a view to calculating approx. bhp from runs as well as the 0-60, 1/4 mile etc. I have done a few runs and have noticed a few things that I don't understand. Any help would be great, thanks in advance.
Firstly the speed data and distance data don't seem to match. There is up to a 10% discrepency on the data I have! For example:-
On a run of 11.6s to do a 0-60 my average speed is 14.57m/s
Thus, in 11.6s I have covered approx. 169m
According to the distance data I have covered 181m and so my average speed is 15.65m/s.
Secondly, why does the distance data not use the altitude in its calculation? I have been looking at the data to understand how it's calculated and it correllates with pythagoras of x and y position. Is the altitude data not accurate enough or is it assumed that you find some flat road?
Finally, to calculate power I require acceleration, kindly provided in the .csv download. However, this requires a lot of massaging to remove some big values and get it to a stage where I am confident that it's realistic. My car in 2nd can pull 0.5g (on a GTech) so I've set this as a maximum figure. What sort of averaging should I use on the acceleration data to get the best results? I've started to search but as ever it takes a while to sift through the pages and get to a result that is relevant.