Ask Ross

Q&A with Ross Bentley

 

Q: How can I “test” for grip by turning the steering more in the middle of a corner on a race track?

Q: How can I “test” for grip by turning the steering more in the middle of a corner on a race track?

Q: “Can you clarify something for me? What do I learn, and how, from the quick input understeer? I don’t get how that helps me understand how much grip is available. I’m guessing that maybe the answer is paying attention to how much understeer a quick input causes? Lots of understeer meaning that I was already close to the limit? I’m used to using slower turns of the wheel to see if I have more grip available than I am using. If the radius tightens, I was not at the limit. Is this not as valid a test as I think?”

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Q: How do I improve my corner minimum speed?

Q: How do I improve my corner minimum speed?

Q: “I have a question not about corner entry speed but rather about MID-corner speed (minimum corner speed). A friend of mine and I compare lots of data when we go to DE’s. He drives a nearly stock 987 Cayman S, is a pretty good driver, and runs tires he can get 30 track days out of. I drive a 718 Spyder with quite a bit of negative camber, Michelin Cup 2s, and have to replace tires every 6-10 track days — fronts more frequently than rears. I feel more comfortable with the car moving around than my friend does, and very comfortably trail brake as needed to balance/rotate the car. I have more grip, more power, and I do turn faster laps, BUT… his mid-corner speeds (or minimum speed in the corner) are sometimes equal to mine! That shouldn’t be the case. What am I doing wrong? Am I just being a wimp? Or does it go deeper than that? I generally brake VERY hard and VERY late and do a lot of trail braking (I go through brakes faster than anyone else I know). Is that part of the problem? Am I overworking my front tires? I record and analyze my tire temps after every session and pay attention to which end of the car I’m ‘overworking’ (determined by tire temps). Throughout any given day, I tend to transition from overworking the fronts to overworking the rears — it’s not significant in either direction, but that’s my trend. Can you help figure out if I’m being too cautious, or if I’m doing something else wrong?”

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