an iRacer called Patrick Moore has created an exporter tool to extract data from iRacing into a format that Motec i2 Pro can read. There is (quite a long) thread at the official iRacing forums about this tool for iRacing here. The tool itself can be downloaded here while the Motec i2 Pro software can be found here. Personally my data logging starts at "How much of the grey stuff did I use?" and ends at "How much of the green stuff did I use?"