G-Tech just came out with a RR for Road Race meter. It can store up to 2 hours of telemetry data at a rate of 10 samplings per second. I have the G-Tech Pro Competition model and they are providing the upgrade image for it that makes it a RR model. It looks like it will be very useful for reviewing your track runs including cornering G load and acceleration.
http://www.gtechpro.com/rr.html
http://www.gtechpro.com/rr.html