After some wind tunnel testing this week, the sanctioning body chose to introduce an air deflector above right-side window, mandating it for all Cup cars this weekend at Daytona. It matches an existing ‘shark fin’ on the left-side of the car, designed to make the liftoff speed higher. In essence, cars will have to be going faster to reach a point where blow-over crashes become possible.
Last weekend, Corey LaJoie spun on his own flipped down the backstretch at Michigan. The wreck was the first blow-over incident at non-superspeedway track in the Cup Series since 2010, when Brad Keselowski flipped upside down at the old version of Atlanta Motor Speedway.
John Probst executive vice president and chief development officer for NASCAR, said that the change will increase the velocity needed for the cars to lift off the ground by another 15% to 20%. The part is crucial in the early seconds of the spin when roof and hood flaps aren’t yet in full effect.
Corey LaJoie, Spire Motorsports, Celsius Chevrolet Camaro
Photo by: Danny Hansen / NKP / Motorsport Images
Speaking on the change, Daytona pole-sitter Michael McDowell wondered what it will do to the cars “balance-well” throughout the race.
“We got a tiny little bit of information, but even that in a wind tunnel by itself isn’t a real indicator of what it will be like in the pack,” explained McDowell. “I don’t think anybody knows. I think everybody is taking their best guesses. I don’t think it’s gonna be terribly different, but there might be some positives from it, too. We’ll see how the cars suck up. Every situation is different and that’s what’s hard about superspeedway racing as rules packages change. Sometimes you’re three-wide in the middle and the car responds like this and sometimes you’re three-wide in the middle, but a car two car lengths off of you and all of a sudden you get something completely new and you’re like, ‘Whoa, where did that come from?’
“When guys are caught off guard or just lose it, it’s because there is a situation that they haven’t been in before, so with this deflector I’m sure there will be some of that.”
William Byron, who won the Daytona 500 earlier this year, believes “it’s going to change the air somehow around the car. Any aero change does.” With no practice, these 40 drivers and teams will have to wait until they are racing on Saturday night to find out exactly how.
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