Keigwin’s at The Track Novice School
Laguna Seca August 5th & 6th
Ambient high 65F
Having seen only one set of Dunlop Q3 tires so far this year prior to the School that were on a Triumph Speed Triple, I didn’t have much repetitive data to draw from other than the carcass was completely different to the Q2 and I mean COMPLETELY.
Fortunately there were 4 riders using these tires on different bikes with different ability levels:- CBR1000RR, CBR600RR, GSXR 750 and Triumph 675. This would provide me with a great sample between horsepower and rider ability to really get into some data points and find some consistent information.
In all cases. riders started with 30psi cold front and rear. As each one came in, tire carcass temps taken with an Intercomp 5mm probe showed 120F front and 140F rear. In all cases, tire pressures were then lowered to 25 rear and 27 front cold for the next session after 45 minutes of cooling time between session (on track was 45 minutes.
With the 600, 675 and 750 tires came in cold again after 20 minutes at 135F front and 150F rear with only a 3psi gain cold to hot. All three bikes had 2psi (hot) removed from the tires and were sent back out. At the end of the session with a mandatory fast lap into the pits, temps improved to 150F front and 160F rear. Tires were left to go completely cold during the 45 minutes plus one hour before lunch, and then reset to 21 rear and 23 front cold. The following session saw gains of 6psi on average cold to hot and the same carcass hot temps.
With the CBR1000, pressures were brought down to 23 rear and 25 front cold, and after 20 minutes we saw gains of 5psi cold to hot and carcass temps from 150-170F.
The most unusual part of the tire wear was that under no circumstances would the rubber ball up on the edges of the tire. For those that have ridden the Pirelli Pro slick, the surface wear looks the same so at all times (to date) all we have seen is a very polished surface indeed.
In the afternoon the coastal fog burned off and in one case (the CBR600) the tire gain cold to hot exceeded 7psi, so that bike would have needed an extra 1-1.5psi hot to get the contact patch to the right size to regulate carcass temps. How did I know that? Look at the small debris on the back edge of the outer sipes on the rear tire. For day 2 of the school we started all four bikes at 23 rear and 25 front as ambient temps were predicted to be higher and we saw gains of 4-8psi from the morning to the afternoon. Again, each rider needs to find their own hot pressure that day, that track, with those ambient temps!!!
I’m trying to get a set from Dunlop to test myself for a much more thorough review so hopefully that can be done in the next 3-4 weeks. I’ll get that data up right after the test.