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Originally Posted by fatoni
you dont need to speculate or make a hypothetical argument regarding the difference in tires. there was already an actual test in which changing tires yielded the least gains in the frs compared to the 1 series and mustang. there is zero need for speculation. you are also omitting the fact that they changed width, height, compount, and rims in that test so even in the data you are using to construct your hypothesis, doesnt provide much if any evidence.
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The evidence is right there from the Road And Track link.. Did you not read it? There is a chart at the bottom of the article that has all the data collected for their test. Since you cannot seem to read here is the data for you using the same size tires (stock vs upgrade):
Primacy HP
Size: 215/45-17 87W
Lap Time: 1:29.3
Max Track Speed: 93.6mph
0-60: 6.6
Skidpad: .89g
Slalom: 67.8mph
Dunlop Star Spec:
Size: 215/45-17 87W
Lap Time: 127.0
Max Track Speed: 94mph
0-60: 6.5
Skidpad:.94g
Slalom: 70.2mph
Those are real and tangible differences. No hypothesis needed.
Here is their take:
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Install the Dunlops on the stock wheels, and presto-bingo! We have a new winner. The FR-S dropped 2.3 sec. with a simple tire swap. And not only does the car maintain its wonderful balance, it's vastly improved. The FR-S' sharp steering is enhanced by the tires' grip, providing a dramatic increase in feedback—with the Dunlops' greater forgiveness at higher slip angles, you can literally turn the steering wheel more. The rear rotates more gently on turn-in and the suspension easily handles the added grip. This is the way the FR-S was meant to run! I'm surprised the engineering team didn't murder the bean counter who forced the low-rolling-resistance tires on them.
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