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Originally Posted by Jdawgboy
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Yes, we've been talking about this extensively on other boards for a few years. COTA has tried over and over to blame the F1 cars for this, saying their great acceleration and braking ability has caused the bumps. This has been known to happen on some tracks, taking the form of rippling bumps in traction and esp braking zones. But the bumps at COTA are all the way around the track, not just in specific areas. If what COTA claims about the F1 cars were true, you'd only see bumps in the braking and traction zones. And remember, COTA was engineered specifically as a dedicated F1 track, designed to take all the forces dished out by F1 cars.
COTA has already done bump grinding operations multiple times in the past. That's basically a much cheaper attempt to hide the bumps and frankly to mask the real problem, which is the soil condition (expansive black clay). After the 2017 MotoGP race, the riders complained about the bumps, so just before the 2018 race, Epstein again had some of bumps 'shaved' or ground down just before the race. The riders rode the track in Friday practice and then commented afterward that it was even worse than before, some comparing the back straight to Motocross 'whoop-de-doos'. They said these bumps made it very unsafe and impossible to get the best speed out of the bike, esp down the back straight, where their speeds exceed 210 mph. They said that at high speeds the bikes were going airborne, launching off of the bumps, causing the traction control system to cut power, which as you can imagine must be very scary and difficult to deal with at 200mph. There are numerous bumps elsewhere around the track that have caused problems, most notably the one on the apex of Turn 18 that has caused multiple crashes, most notably Maverick Vinales crashing out from 4th place on lap 2 in 2017. During the IndyCar weekend, the drivers adopted the practice of just driving about 10 feet wide of the normal racing line there, just to avoid that big bump on the apex.
Grinding the bumps only masks the real problem, as I mentioned, but it also can create more problems down the road as the grinding thins and thus weakens the asphalt surface. Now we're starting to see numerous thick, long cracks appearing in the track surface in the same areas where track grinding has been done. This allows water under the track surface and only makes the problem even worse.
COTA has also tried to blame the weather, but everyone who's ever been out there or who lives in the area knows this was always going to be a problem, no matter the weather. All the roads out there go wavy within a year or so of smoothing and resurfacing. When COTA was built, they put in place an engineering plan intended to prevent what we're seeing - by digging down as far as 20+ feet in places, laying a water barrier layer, and then refilling with prescribe road bases to prevent the shifting. There are rumors though that corners were cut in this process to save money.
I'm told by guys in the industry on another board that the best proper fix is to smooth and repave the track from start to finish, but I hear that will cost $8-12M, and COTA/Epstein don't want to spend the money. COTA did resurface Turn 10 over the winter, and ground more bumps. The industry guys say that as long as COTA continues to take this approach, the problems will just get worse and worse.