Moody Posted November 1, 2011 Report Share Posted November 1, 2011 Dear Steve, I race in the 600cc National championship in Dubai - UAE, I would consider my self with the front runners, 1 sec max off the fastest track record here. We have been racing on Dunlops D211 Gps as the controlled tire, 190 rear for the 600s. While last year we were on the UK made 6838 compound front and back, which worked great, good grip and we could do 15min warm up, 20min qualifying and 2 x 20min races. Plus a 4x20 min track day (they wouldnt be that grippy on the track day though!) This season, Dunlop has switched to 2 compounds, UK made 6854 rear with a 6838 front / or the French D211 GPR front and rear. (which are much cheaper) After the 1st round, everyone experienced very hard tear on the 6854 rear, mind you it was very hot (about 36 dec C air temp), I have tried significant suspension changes to try and help the wear which it did but not too significant. Dunlop UAE, mentioned that we had the same issues with the 6838 last year as well, but after a couple of rounds it was brilliant, couldve been the climate temp getting cooler in the season (which is the case here in the UAE plus the 1st round is on a short, twisty and tight track with a lot of braking) I opted for the French ones for round 2, and while surely the wear was very good, and Dunlop says it has more longevity, I have to say the grip level is not the same as the UK 6854 ones and not even near the 6838 UK. My questions are: - How much difference in lap times would the UK provide on the French? (both N-tech, and same pressure, 23 -24 hot) anything more than 0,5 sec would be a bid deal in our class! - What is the actual compound for 6838 vs 6854? I have been told its medium hard - endurance. - I was told the french has longer longevity, which I agree but is there an indication on the compound for the GPR? - Can I use a 6838 UK front and a French rear? - Does having more pressure in the front affects chattering while entering corners and braking or is it less pressure? Thanks a lot for your help. Cheers, Mahmoud Quote Link to comment Share on other sites More sharing options...
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