You could go to the next level and video your riding, and on from that you take lap times, but you need to ride consistant, if you get tired your times will be worse and it will not give a true reflection of the suspension.Suspension testing is hard for some, even some world class riders have no feel for good or bad suspension, but if you try you can tune in to the suspensions behaviour, however i tend to now think more about how the suspension is, than what i should be doing to go faster in the race.