UHP Tire Test raw data: Grassroots Motorsports forum: Grassroots Motorsports Magazine

Subscribe get a full year for only $19.95 Sample get a free issue—no strings attached

May 12, 2009 10:02 a.m. Andy Hollis

We ran out of space in the print mag for all the run data from the recent UHP tire shootout "Texas Toasted Tires". For those that want to drill down, here's that data. First set of four runs on each tire was Andy driving, second four was Per. There are segment times for the opening 90-degree turns, slalom, and the esses/sweeper section, and then a total time for each run. See the print mag for a course map. Lots of interesting stuff here.

And BTW, test #2 is done, written, and going to print for the August edition. That one will compare the top three from this test (run in reverse order) to the new Yoko AD08 and the Toyo in 225 size.

Enjoy!

--Andy

90's Slalom Sweepers Total

Falken RT-615

12.206 7.440 15.673 35.319

12.153 7.433 15.638 35.224

12.208 7.527 15.698 35.433

12.107 7.413 15.713 35.233

12.319 7.843 16.024 36.186

11.923 7.585 16.248 35.756

11.869 7.634 15.796 35.299

12.063 7.342 15.720 35.125

Dunlop Direzza Z1

12.096 7.323 15.780 35.199

12.111 7.323 15.627 35.061

12.199 7.440 15.634 35.273

12.154 7.497 15.652 35.303

12.580 7.802 15.882 36.264

12.197 7.920 16.028 36.145

12.329 7.618 15.868 35.815

12.364 7.973 16.008 36.345

Toyo R1R

11.954 7.272 15.328 34.554

11.752 7.335 15.365 34.452

11.948 7.275 15.341 34.564

11.902 7.297 15.318 34.517

11.703 7.706 15.485 34.894

11.836 7.663 15.321 34.820

11.704 7.628 15.543 34.875

11.707 7.543 15.596 34.846

Bridgestone RE-01R

11.943 7.308 15.303 34.554

11.930 7.268 15.232 34.430

11.914 7.253 15.269 34.436

11.923 7.370 15.199 34.492

11.873 7.377 15.407 34.657

11.823 7.471 15.525 34.819

11.999 7.670 15.602 35.271

12.007 7.420 15.758 35.185

Bridgestone RE-11

11.898 7.232 15.109 34.239

11.930 7.224 15.116 34.270

11.846 7.234 15.235 34.315

11.743 7.251 15.244 34.238

11.746 7.415 15.165 34.326

11.735 7.461 15.131 34.327

11.772 7.789 15.270 34.831

11.729 7.576 15.228 34.533

Kumho XS

11.845 7.146 15.039 34.030

11.662 7.148 15.253 34.063

11.754 7.356 15.119 34.229

11.812 7.228 15.316 34.356

11.692 7.465 15.046 34.203

11.791 7.323 15.323 34.437

11.721 7.580 15.100 34.401

11.668 7.528 15.123 34.319

Falken RT-615

12.043 7.283 15.568 34.894

12.028 7.285 15.426 34.739

12.011 7.404 15.468 34.883

11.968 7.390 15.414 34.772

11.911 7.425 15.434 34.770

11.895 7.452 15.570 34.917

11.863 7.704 15.471 35.038

11.874 7.294 15.675 34.843
May 12, 2009 11:45 a.m. P71 Dork

Why did you run the original Falken times instead of the second set? It seems like the drivers learned the course or the weather improved or something to bring the tires way down (when we're talking tenths of a second). Also, after such an improvement why not retest the Dunlops as well, especially since they seem to be the "hot" one right now and the stats don't make sense compared to actual results in autocrosses.
May 12, 2009 12:25 p.m. John Brown MegaDork

Pretty standard tire testing, you rerun the first set to verify the tires data over the drivers learning curve.
May 12, 2009 12:43 p.m. P71 Dork

So why not print the second set of times as the results for the Falkens? No reason that they should have to suffer the half second penalty just for being first.
May 12, 2009 12:59 p.m. Tom Heath Production Editor

The second test is simply to check the original test results. If we saw something way off, we'd have to retest everything. If we had used the better Falken results, someone would be accuse us of preferring them by giving two chances at the test.

Autocross results are somewhat "noisy" data compared to measured testing.

Event results are more indicative of driver talent, and you're rarely dealing with a large sample group using identical equipment. For what its worth, so far this year the highest Street Touring finish at a national tour on Dunlops is 14th. Not the hot one on a national level, at least in this size.
May 12, 2009 1:00 p.m. Per Schroeder Technical Editor/Advertising Director

the retest Falken numbers were printed in the summary.

Actually, the results do makes sense, relative to national competition, for the size that we tested. If we were testing on a WRX Sti, the Dunlop would have done better.
May 12, 2009 1:31 p.m. VanFab

Per: your impressions weren't published in the mag; are you willing to share them here?

I ordered the Kumhos last week, and the raw data certainly seems similar enough to justify the purchase of the 'underdog'. $91/tire FTW!
May 12, 2009 6:31 p.m. Per Schroeder Technical Editor/Advertising Director

Hi! The tone and the impressions that aren't specifically attributed to Andy are mine. I liked the RE11 and the XS the best and really couldn't get a handle on the R1R—Andy has the familiarity with both the car and Toyos to make them sing to their potential. The Falken felt the fastest to me, but the timers said otherwise.
May 22, 2009 7:22 p.m. HotRodMex None

Do you guys have any opinion/insight/random guesses on how these results would translate to heavier cars and larger tires?