Photograph by Timothy Harper
Things move quickly in the high-performance tire world courtesy of constant innovations in materials, design and manufacturing techniques. Getting an optimal combination that hits all of the possible design goals takes a huge investment of both time and money. And if the tread pattern is also new, you’ll need a bevy of shiny new molds–another large expense.
Given that the UHP …
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It would be interesting to see consistency calculated in the lap time tables to see if that's changed any, or just if the driver seems to be getting more dialed in over the day.
Lap times are not the issue with the Falken, its the center rub falling off after 3 laps. If that didn't happen, they are an improvement over the old. They burned me twice with poor quality, it will take more data to convince me to try them again.
theruleslawyer said:It would be interesting to see consistency calculated in the lap time tables to see if that's changed any, or just if the driver seems to be getting more dialed in over the day.
That's the whole point of bracketing the test. Same tires are run at the beginning and end. Gives a read on any changes related to driver or surface change.
For this test, the final set of runs on the RE71RS are about .15 quicker on both single lap best and average (not shown, but I've done the math). So a case could be made that a small portion of the 4 tenths gain from RT660 to RT660+ was due to that. But single tenths are also easily within the noise of this type of testing.
Further, we are privvy to some other unpublished real world 3rd party comparison testing of these two tires from a reliable source. And those results are similar to ours, both the objective and subjective portions. So our confidence is high on this one.
pinchvalve (Forum Supporter) said:Lap times are not the issue with the Falken, its the center rub falling off after 3 laps. If that didn't happen, they are an improvement over the old. They burned me twice with poor quality, it will take more data to convince me to try them again.
Did you do a mild initial heat cycle (or pay to have it done) before hammering on them?
I've seen this happen with RT660's that were bolted on as stickers and pushed hard.
Either way, one of the results of the change was more even pressure distribution across the face, so that should help the cause.
Andy: Did the 660+ develop a tread splice failure? Looks like something in the photo.
Also, funny typo "Flaken" in the photo caption!
jwasilko said:Andy: Did the 660+ develop a tread splice failure? Looks like something in the photo.
Also, funny typo "Flaken" in the photo caption!
Good eye!
Actually, I must have those labeled backwards -- it was the outgoing tire that did that. Pretty ironic.
I'll have the guys get the piece fixed up. This one got rammed through quickly.
....
Ninja edit now complete.
PS: Failure is too strong a word. It's cosmetic only and typically wears away in short order.
If memory serves me well, the RT660s got faster after losing 2/32nds of treadwear. Would be interested to see a test of these versus RE71Rs at a similar tread depth - I recall the RE71RS being a bit squirmy at full tread.
Andy Hollis said:theruleslawyer said:It would be interesting to see consistency calculated in the lap time tables to see if that's changed any, or just if the driver seems to be getting more dialed in over the day.
That's the whole point of bracketing the test. Same tires are run at the beginning and end. Gives a read on any changes related to driver or surface change.
For this test, the final set of runs on the RE71RS are about .15 quicker on both single lap best and average (not shown, but I've done the math). So a case could be made that a small portion of the 4 tenths gain from RT660 to RT660+ was due to that. But single tenths are also easily within the noise of this type of testing.
Further, we are privvy to some other unpublished real world 3rd party comparison testing of these two tires from a reliable source. And those results are similar to ours, both the objective and subjective portions. So our confidence is high on this one.
Yah, I understand the bracketing. However my catalyst pumps out a consistency stat. It would show how stable the lap times are. Sometimes you talk about tires falling off, or maybe that one tire is easier to drive than another. That sort of data could probably be quantified by looking at how variable lap times are. I was just looking at all the lap times and trying to figure it out in my head.
In reply to sibanez :
RT660 long-term study right here ==> https://grassrootsmotorsports.com/articles/how-optimize-tires-quicker-laps-and-longer-life/
As for the RE71RS, here's a test with both a full tread and 5/32 version -- big difference ==> https://grassrootsmotorsports.com/articles/hoosier-trackattack-pro-tire-test/
And finally, we have another long-term test result we'll be sharing soon, along with lots of other 200tw tips & tricks.
In reply to Andy Hollis :
Serious ninja editing!
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