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Michigan - Tony Stewart, one of motorsport's biggest names, announced on Wednesday he would retire from Nascar driving after the 2016 season, saying: "Deep down you know when it's time to do something different."
Stewart, a three-time Nascar champion and winner of 48 races at the circuit's top level, said Clint Boyer would get behind the wheel of the Stewart-Haas Racing Chevrolet after next season.
He will remain co-owner of the four-car Stewart-Haas Racing team
'It's time for a change'
Stewart told a news conference in Kannapolis, North Carolina: "Everybody in their career makes the decision that it's time for a change.
"It's nothing that you plan. Deep down you know when it's time to do something different and make a change like this."
It has been a rough stretch for Stewart, who has not had a top-5 finish in 28 Nascar races this season. In each of his first 15 seasons, Stewart, known as "Smoke," won at least one race.
Racing slump
In year, he fatally struck 20-year-old fellow driver Kevin Ward Jr. in a sprint car race in upstate New York. Ward's parents have filed a wrongful death lawsuit against Stewart.
Stewart denied that his driving slump, the death of Ward, or the broken leg he suffered in a sprint car crash in 2013 had anything to do with his decision to quit Nascar racing.
He said: "Not 1% has that had anything to do with it. This is strictly what I want to do. My leg feels fine. The (Ward) tragedy, nothing's going to change that. It happened, but it's not going to direct the rest of my life."
Stewart, who has fought with other drivers and never shied away from bumping competitors to secure position on the track, insists he will continue to race, just not in Nascar.
It was not uncommon for Stewart to race in an obscure low-level series during the week and return to Nascar on Sunday.
He said: "I'm not retiring from racing. I'm just retiring from the (Sprint) Cup series."
The only driver to win a title in both IndyCar and Nascar, Stewart said he would love to win Nascar's premier event, the Daytona 500, for the first time in 2016.
He said: "This added year is not just a ride-it-out year. We're going to gouge your eyes out. We're going to do everything we can to win races and win another championship."
Incredible contribution @TonyStewart has made on & off the track. Thanks Tony! Look forward to calling your final Daytona 500 next year!
— Jeff Gordon (@JeffGordonWeb) September 30, 2015