The German publication Auto Bild have just tested five 235/35 R19 track day tyres using a Ford Focus ST, and included a "normal" maximum performance road tyre as comparison.
Given the location of the test (Continentals proving grounds in Texas), and the performance of the included road tyre, we're going to assuming the tyre was the Continental Sport Contact 6, and it demonstrates just how good road tyres have become!
Dry
In the dry testing, the Pirelli shines. It is the fastest in the dry lap, just beating the Michelin to the top spot. The summer road-tyre would have placed fourth overall, averaging 117.1 Km/H, which is faster than both the Yokohama and Toyo track day tyres!
Again, the Pirelli just beats the Michelin to the top spot during the dry braking test, but this time the Toyo matches the Michelin for second place. Again, surprisingly the summer road-tyre places fourth, at 35.4 meters.
Wet
Perhaps the biggest surprise of the test is the Pirelli in wet handling, winning the test and beating the road-bias summer tyre which lapped at an average of 78.2 Km/H. The Michelin and Dunlop were close behind, with the Yokohama and particularly the Toyo struggling.
During wet braking, the summer tyre dominated, stopping the Ford Focus ST in just 31.5 meters, where the best track day tyre could only manage 34 meters. Again the Yokohama and Toyo struggled.
The summer tyre again showed its wet weather advantage, winning the aquaplaning testing, managing 71.5 Km/H before the car started floating. This time the Michelin track day tyre surprised, almost matching the summer tyre and with a huge gap to the second placed Dunlop. Aquaplaning is where the Pirelli tyre struggled, and lost a lot of points.
Results
It's a shame the Pirelli P Zero Trofeo R struggled in the aquaplaning tests, as looking at the other tests it just beat the Michelin as the best track day tyre on test. The real surprise is how well the summer tyre did in the dry, but it's worth mentioning the testers said the summer tyre felt soft and slow to steer when comparing against the best track day tyres, and there's no way the road-bias summer tyre would manage as long on track as the track day tyres without overheating.
In short, the Michelin is the best tyre if you're spending some time on the road too, but if you want the pure dry-track experience, go with the Pirelli. Or a slick.
First (bad?) test of the AD08R and second of the 888R on tyrereviews. And there lies the problem, the results are very different from experience, these two should perform a lot better in the dry. And the 888R did perform a lot better in Sport Auto UHP test, better than the Cup2! Also, the comment of the AD08R 'slow steering' sounds very out of place, as it is a very sharp steering tyre!
I strongly suspect that in this test they made a typical 'beginners mistake', or made a misguided decision based on 'same conditions for all' and ran the AD08R and 888R on too high standard pressures. These two are, contrary to the other tyres in this test which are track optimised sports tyres, more of a road legalized semi slicks with reinforced sidewalls. As such, they should be ran approx. 0,5bar lower in pressure for them to grip in the dry. If not, they simply won't heat and hook up, and just slide over their hard shoulders.
Unfortunately Auto Bild did not write anything on the pressures used, but anyhow, results are inconsistent here as actually also TireRack has tested these tyres against 'normal' sports tyres and these semi's most definitely do better in the dry.
Anyhow, nice to see the aquaplaning results (water depth?) and the unsuspected good results in the wet for the Trofeo R. More data needed though.