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About the International Motor Sports Association (IMSA)

International Motor Sports Association, LLC (IMSA) was originally founded in 1969 and owns a long and rich history in sports car racing. Today, IMSA is the sanctioning body of the IMSA WeatherTech SportsCar Championship, the premier sports car racing series in North America. IMSA also sanctions the IMSA Michelin Pilot Challenge and IMSA VP Racing SportsCar Challenge, as well as four one-make series: Ferrari Challenge North America, Idemitsu Mazda MX-5 Cup presented by BFGoodrich Tires, Lamborghini Super Trofeo North America and Porsche Carrera Cup North America. IMSA – a company within the NASCAR family – is the exclusive strategic partner in North America with the Automobile Club de l’Ouest (ACO) which operates the 24 Hours of Le Mans as a part of the FIA World Endurance Championship. The partnership enables selected IMSA WeatherTech SportsCar Championship competitors to earn automatic entries into the prestigious 24 Hours of Le Mans.

Cadillac Whelen Scores "Hometown" Victory in Chevrolet Detroit Sports Car Classic

Aitken, Bamber Team Up for Seventh Straight Podium and Championship Lead

May 30, 2026

By John Oreovicz

IMSA Wire Service

Race Results

DETROIT – American muscle was on full display Saturday as Jack Aitken, Earl Bamber and the No. 31 Cadillac Whelen Cadillac V-Series.R dominated the Chevrolet Detroit Sports Car Classic, the 100-minute IMSA WeatherTech SportsCar Championship race through the streets of downtown Detroit as part of the Chevrolet Detroit Grand Prix Presented by Lear.

Motul Pole Award winner Bamber started the race and comfortably led the first 33 minutes before handing over to Aitken, who built a 14-second lead until a full-course caution was called for debris on the track with 20 minutes remaining. That late-race reset offered a final glimmer of hope to the Grand Touring Prototype (GTP) class competition.

But it was unfulfilled hope, as Aitken aced a pair of late-race restarts and was able to pull away during the final stages while chaos broke out behind him. The No. 31 Cadillac built a 6.023-second gap before crossing the finish line ahead of the No. 25 BMW M Team WRT BMW M Hybrid V8 shared by Philipp Eng and Marco Wittmann.

Compounding the joy for General Motors in its corporate hometown at an event it sponsors, Ricky Taylor and Filipe Albuquerque took a season-best third place in GTP in the No. 10 Cadillac Wayne Taylor Racing Cadillac V-Series.R., while Corvette Racing by Pratt Miller Motorsports notched the Grand Touring Daytona (GTD) PRO class victory.

“My team absolutely nailed it, and to do it here at the home of GM and Cadillac, with so many friends and family with us…it really doesn’t get a lot better than that,” Aitken said. “It’s a win that we’ve been searching for for a while. With so many people involved in the program here, it was really meaningful. It’s pretty overwhelming, but amazing.”

“It was pretty nervy with those last yellows, just watching,” Bamber added. “I'm just really happy for Cadillac, and happy for the Corvette guys also, to finally get the win here in our home race. We had a great Cadillac this weekend that was super quick from the moment it hit the track. That’s a pretty perfect weekend.”

With seven consecutive podium finishes dating to a win at the TireRack.com Battle on the Bricks at Indianapolis Motor Speedway in September 2025, the Cadillac Whelen team is on a hot streak unprecedented in the four years of the current IMSA GTP era. The victory was the fourth in IMSA competition for Aitken and the 11th for Bamber.

Cadillac has now won five times in Detroit, but the first four came at the old Belle Isle circuit (2017, 2018, 2021 and 2022).

Other than working through GTD PRO traffic, Aitken pretty much had the 1.645-mile Detroit track to himself for most of his stint. Two cautions in the final 20 minutes did little to dampen his confidence.

“I’ve been lucky to be in that position a few times before, but especially on a street circuit, you really need to keep your focus and keep pushing – stay in that rhythm and not think too far ahead,” Aiken said. “Frankly, you know there’s a high chance of a yellow that will bring things together again and create that knife-fight to the finish.

“I tried not to think too far ahead,” he continued. “But on Sector 3 of the last lap, I let myself realize, ‘This is going to be pretty cool!’”

The No. 25 BMW earned its second consecutive podium finish. Eng credited BMW M Team WRT for a late-stopping strategy that helped them overcome a loss of two positions in the hectic opening laps.

“Marco drove fantastically and we didn’t make any mistakes,” Eng said. “But the No. 31 Cadillac was just out of reach for us this weekend.”

Meanwhile, Taylor and Albuquerque earned the first trip to the rostrum this year for Wayne Taylor Racing in a year that has seen the No. 31 Cadillac finish on the podium every race.

“Huge relief here in Detroit,” said Ricky Taylor. “We got very unlucky in qualifying and that could have changed our day, so the team was on the back foot again at the start of the race. I’m glad everything worked out as planned and the team was flawless.”

With the win, Aitken unofficially took over the lead for the GTP drivers championship by 144 points over Laurin Henirich, whose title hopes took a turn for the worse at Detroit with an 11th-place finish. Heinrich incurred a stop-plus-60-seconds penalty for incident responsibility that dropped the No. 5 JDC-Miller MotorSports Porsche 963 two laps down after he forced the No. 23 Aston Martin THOR Team Aston Martin Valkyrie into the wall.

Felipe Nasr and Julien Andlauer, who rallied to finish fifth at Detroit after starting 10th, are third in the driver standings, 10 points behind Heinrich. Cadillac has leapfrogged Porsche to lead the GTP manufacturer standings by 17 markers.

The next round of the IMSA WeatherTech SportsCar Championship is the Sahlen’s Six Hours of The Glen, June 25-28 at Watkins Glen International. In the interim, nearly three dozen full-time IMSA drivers will compete in the 24 Hours of Le Mans from June 10-14.

Corvette by Pratt Miller Captures Elusive Detroit IMSA GT Win

Garcia, Sims Deliver a GTD PRO Victory in Front of Chevrolet Brass

May 30, 2026

By Tony DiZinno

IMSA Wire Service

Race Results

DETROIT – For Corvette Racing by Pratt Miller Motorsports, winning in Detroit was an important milestone to achieve. The team had not delivered an IMSA points race triumph in the city since 2008 on the former Raceway on Belle Isle Park.

They did so on Saturday in the Chevrolet Detroit Sports Car Classic. But despite leading 73 of 79 laps in the fourth round of the IMSA WeatherTech SportsCar Championship Grand Touring Daytona Pro (GTD PRO) season, Alexander Sims and Antonio Garcia did not have it all easy in their No. 3 Corvette Z06 GT3.R.

Sims led the opening 24 laps from pole position and pitted 32 minutes into the 100-minute race, turning the car over to Garcia. As he explained, he had the easy part.

“I was honestly pretty nervous going into the race, because of knowing how much mayhem can unfold that's outside of your control around here,” Sims said. “Once the race got off to a clean start for us, I was able to maintain position after the first corner and our Corvette was working really, really well. The tires switched on nicely and I was able to, you know, sensibly pull out a pretty good gap. Even with one restart, it was fairly smooth sailing, to be honest. That also reduced the amount of times the GTPs came past me.

“But then with GTP traffic and the restarts at the end, it was mad to watch.”

Garcia’s stint covered the “mad” portion of the race in Motown.

In the middle portion of the race, the Spaniard lost a significant chunk of his multiple-second lead behind the tail end of the GTD PRO field. A snarling pack of rivals behind, including Jack Hawksworth in the No. 14 Vasser Sullivan Racing Lexus RC F GT3, gave chase but were unable to make a move past. The gap fell to under a second before he was able to get past and then expand the lead.

“It's part of managing and knowing how fast he is, and defending against the cars behind you,” Garcia explained. “So, you also need to know how much you can push him in order to be as fast as possible. Because there were laps where I was really on him, and he was really defending very hard, but I knew when you do that, you lose a lot of time.

“There was a point where they were getting really close, so I had made a move. I mean, I know I'm the leading car. They don't want to lose a lap, and I also knew once I cleared them that he didn't care anymore.”

Garcia, too, had to dodge the outward-leaning walls of the 1.645-mile Detroit Street Circuit and drove most of the second half of the race with a loose right hand driver’s side mirror. He then also had to navigate what he thought was fluid on the track, and as the first car through, had to tiptoe through.

A pair of late-race full-course cautions increased the drama and the respective heart rates.

At one stage, it appeared Hawksworth had made a pass of Garcia after contacting the rear of the No. 3 car and emerging ahead exiting the tight and narrow Turn 1.

But that pass was negated after it was deemed to have been completed after the full-course caution started. A subsequent reorder put the No. 3 Corvette ahead of the No. 14 Lexus, and with a drive-through penalty then assessed to the No. 14 car for incident responsibility, it dropped down the order.

“I was completely on top of oil,” Garcia said. “Out of Turn 9, last corner, he had a good run, but as soon as we went across the line, I saw the yellow flags and in my dash with the flag, too. I didn’t know how our car is right now, and that's something that I didn't know also on the next restart, how the car would behave after pretty heavy contact we had on that situation.”

Upon a final restart, Garcia was able to streak away to the checkered flag by 1.935 seconds.

This secured Garcia’s 32nd IMSA win, tying him with a trio of sports car veterans in Allan McNish, Ricky Taylor, and Sascha Maassen for 18th on the all-time sports car winners’ list. But it’s his first at Detroit. For Sims, it’s his ninth win.

The podium positions changed drastically in the final 10 minutes as nearly the entire rest of the GTD PRO field leaned into Detroit’s propensity for fisticuffs, set against the prominent Joe Louis “The Fist” that sits inside the Turn 3 hairpin.

At the final restart, the order was Garcia, Nicky Catsburg in the sister No. 4 Corvette and Aaron Telitz in the sister No. 15 Vasser Sullivan Racing Lexus RC F GT3. Contact between Cars 4 and 15 in Turn 3 saw Car 4 assessed a drive-through for incident responsibility.

Another incident between Cars 59 and 64, also in Turn 3, saw the No. 59 car assessed a drive-through for incident responsibility.

“It was a bit of a Mario Kart scene behind my rearview camera,” Garcia laughed.

Two blue cars that ran otherwise quiet races and stayed out of the wars benefited as a result. The Lamborghini Temerario GT3 scored its first IMSA podium in second with Andrea Caldarelli and Sandy Mitchell second in the No. 9 Pfaff Motorsports entry. Then Ford Racing made it back to the podium with Monterey winners Frederic Vervisch and Christopher Mies in third in their No. 65 Ford Mustang GT3.

To reflect how chaotic the finish was, the No. 9 car and No. 65 car took the final restart from fifth and seventh places and wound up on the podium.

The points also are in close quarters leaving Detroit. Catsburg and Tommy Milner in the No. 4 Corvette unofficially lead Connor De Phillippi and Neil Verhagen in the No. 1 Paul Miller Racing BMW M4 GT3 EVO by 18 points, Mies and Vervisch by 20 and Detroit winners Garcia and Sims by 31.

The No. 4 Corvette finished seventh and No. 1 BMW finished fourth on the roller coaster day.

The next GTD PRO round is part of the next all-class WeatherTech Championship race, the Sahlen’s Six Hours of The Glen at Watkins Glen International on Sunday, June 28.

Big Day for GM as Cadillac, Corvette Claim Detroit Poles

Bamber, Deletraz Sweep GTP Front Row at Chevrolet Detroit Sports Car Classic

May 29, 2026

By John Oreovicz

IMSA Wire Service

Qualifying Results

DETROIT – General Motors basked in the Motor City sunshine Friday as its entries earned the Motul Pole Award for both IMSA WeatherTech SportsCar Championship classes competing at the Chevrolet Detroit Sports Car Classic.

Earl Bamber was fastest in both practice sessions in the No. 31 Cadillac Whelen Cadillac V-Series.R, and he converted that speed into the overall and Grand Touring Prototype (GTP) class pole. Meanwhile, Alexander Sims sped to the top starting spot for Corvette Racing by Pratt Miller Motorsports in the Grand Touring Daytona Pro (GTD PRO) class.

Bamber was delighted with the balance in his Cadillac after no less than three and half hours of practice time. The 35-year-old New Zealander was correct in his confidence that he could break Nick Tandy’s two-year old track-record for the tricky 1.645-mile street course along the Detroit Riverwalk in the shadow of the Renaissance Center, GM’s former corporate headquarters.

Bamber was one of five drivers who lapped under one minute, 6 seconds, finally lowering the benchmark to 1:05.313 with four and a half minutes remaining in the 15-minute session, for an average speed of 90.670 miles per hour. That was quick enough to top Tandy's previous track record of 1:05.390.

Bamber and his competitors might have gone even faster, before the session met a premature end. Felipe Nasr ran wide at Turn 1 in the No. 7 Porsche Penske Motorsport Porsche 963 and his teammate Kevin Estre in the No. 6 Porsche slapped the wall in avoidance.

Louis Deletraz secured the outside front row staring berth in the No. 40 Cadillac Wayne Taylor Racing Cadillac V-Series.R (1:05.635/90.226 mph), ahead of Nick Yelloly in the No. 93 Acura Meyer Shank Racing w/Curb Agajanian Acura ARX-06 and Marco Wittmann in the No. 25 BMW M Hybrid V8 fielded by BMW M Team WRT.

This is Bamber’s third pole position in IMSA competition, but first in GTP or any prototype class. His last start from the top spot came in the GT Le Mans (GTLM) class at the 2015 Motul Petit Le Mans at Michelin Raceway Road Atlanta.

“It’s been a great weekend so far,” Bamber said. “I loved the old Belle Isle track, but as soon as I drove here, I really clicked with this place and we decided to shake it up a bit this weekend and have myself run the qualifying, and it’s really nice to get my first GTP pole.

“The car has been fantastic all weekend, and obviously it’s really cool for Cadillac to get pole position at our home race – and Corvette too, with ‘Simmsy,’” he added. “Hopefully we can just run away and hide and stay out of trouble. But we know this race has brought a lot of surprises over the years.”

The difficulty of the “concrete canyon” street course in the heart of downtown Detroit was on display during practice, when no fewer than 40 reports of spins or runs down escape roads were reported. But qualifying was clean until the Porsche Penske drivers experienced the double disaster that will leave them starting eighth and 10th in the 11-car GTP field.

The No. 5 JDC-Miller MotorSports Porsche 963 qualified by Tijmen van der Helm and co-driver Laurin Heinrich may look to pull a strategic gamble to leapfrog from P11 and repeat its last-to-first win achieved last time out at WeatherTech Raceway Laguna Seca; Heinrich enters this race at Detroit atop the GTP points.

But Bamber and his co-driver Jack Aitken are on a hot streak, starting the 2026 season with four consecutive podiums after wrapping up ’25 with a pair of wins. Detroit would be the ideal venue to find their way back to the top step of the podium. Aitken entered the weekend second in points, 21 behind Heinrich, and with Friday’s qualifying result is unofficially only six back to start Saturday’s 100-minute race.

“We’ve sort of got a motto in the team that if we keep knocking on the door, if we’re in that top two or three all the time, then eventually it opens,” Bamber said. “We’re racing against some great teams. It’s never easy to win one of these things, but we’re staring up front and hopefully we can lead and execute.

“We just have to our thing the best we can,” he smiled. “Today we converted it; we’ll see if we can do the same thing tomorrow.”

The Chevrolet Detroit SportsCar Classic will be broadcast live on NBC and streamed domestically on Peacock, with the green flag set for 4:10 p.m. ET Saturday, May 30. International streaming options include the official IMSA YouTube Channel and IMSA.TV.

Three Takeaways: Chevrolet Detroit Sports Car Classic

Standard of the World; What in the World; and World Class

June 1, 2026

By John Oreovicz

IMSA Wire Service

DETROIT – There’s more flag waving than usual this year in the United States, with 2026 being the 250th anniversary of America’s Declaration of Independence. The IMSA WeatherTech SportsCar Championship Chevrolet Detroit Sports Car Classic provided another reason to celebrate the Stars and Stripes, as Cadillac and Corvette swept to overall and class victories on the streets of Motown - the historical hometown of the American automotive industry.

Detroiters love their cars, and that was abundantly apparent throughout the Chevrolet Detroit Grand Prix weekend as large crowds packed the downtown circuit each day. The WeatherTech Championship served up a 100-minute sprint race as the Saturday headliner, and the local fans – especially enthusiasts of General Motors and its marques – had to have liked what they saw.

The narrow 1.645-mile track defines the term “concrete canyon,” yet IMSA’s Grand Touring Prototype (GTP) and Grand Touring Daytona Pro (GTD PRO) classes staged a compelling race that featured fender-banging action to the very end. Here are three takeaways from the WeatherTech Championship’s version of ‘Motown Madness’:

Standard of the World

Cadillac adopted “Standard of the World” as its corporate slogan after winning the 1908 Dewar Award from the Automobile Club of England. And over the last nine months, Cadillac – the No. 31 Cadillac Whelen Cadillac V-Series.R, to be specific – has set the GTP standard in the WeatherTech Championship.

Since winning the TireRack.com Battle on the Bricks at the Indianapolis Motor Speedway’s road course in September 2025, the No. 31’s finishing record is 1-1-2-3-2-2-1. Jack Aitken and Earl Bamber have earned a Motul Pole Award apiece in ‘26, and Aitken has established a comfortable points cushion over Porsche pilots Laurin Heinrich, Felipe Nasr, and Julien Andlauer in the GTP driver’s championship.

During that remarkable seven-race streak capped by the Detroit victory, Aitken and Bamber could or should have won at least one other race. Four weeks earlier at WeatherTech Raceway Laguna Seca, Bamber lost the lead and the win on the last lap to an inspired move by Heinrich in the No. 5 JDC-Miller MotorSports Porsche 963.

Detroit was therefore redemptive – especially when you consider Aitken lost a 14-second lead to a full-course caution with 20 minutes remaining. The bunching of the field caused a bit of nail-biting for the Whelen crew, but such was the No. 31 Cadillac’s advantage that Aitken built a 6-second lead over the last six green-flag laps.

In GTD PRO, Antonio Garcia and Alexander Sims enjoyed a similar dominant run at the front in the No. 3 Corvette Racing by Pratt Miller Motorsport Corvette Z06 GT3.R, completing a memorable hometown event sweep for General Motors. The Corvette victory was especially sweet given that the Detroit GTD PRO class win in 2025 went to archrival Ford and its Mustang GT3.

“What a special day for General Motors and Cadillac Racing and Corvette Racing teams in Detroit,” stated GM President Mark Reuss. “Winning both classes of the Chevrolet Detroit Sports Car Classic on the streets of the Motor City is a tremendous achievement for our motorsports, design, and engineering teams.

“Congratulations to Whelen Cadillac and Corvette Racing by Pratt Miller Motorsports teams on hard-earned victories at our home race.”

What in the World?

It’s well-known that the Detroit street course inaugurated in 2023 is short, and at places, extremely narrow. The nature of the track, with a single long straight and an abundance of 90-degree corners places a premium on braking performance.

Perhaps it’s not surprising that IMSA’s Pit Notes – which were not compiled for the first time since 1999 by Lee Driggers, who sadly passed away recently after a short battle with cancer – recorded more than 50 spins or overruns into escape roads during the course of practice. Thankfully, those incidents produced only three red flags. But would the race prove to be so clean?

In a word, mostly. After an early caution for debris, the field ran 62 laps under green flag conditions until chaos prevailed in the final 20 of 100 minutes. Most of the “argy bargy” occurred in the GTD PRO class, though in GTP, the No. 6 Penske Porsche Motorsport Porsche 963 lost out on a near-certain podium finish when Laurens Vanthoor got roughed up in the closing lap, requiring a pit stop for a new tail that dropped the entry to an eighth-place finish.

Antonio Garcia, who completed the winning anchor stint in the GTD PRO-winning No. 3 Corvette Racing by Pratt Miller Motorsports Corvette Z06 GT3.R, described what unfolded in his rear-view mirror/video feed as “a bit of a Mario Kart scene.”

Two cars in the wars were the pair of Vasser Sullivan Racing Lexus RC F GT3s, which were in either win or podium contention before a pair of collisions with the two Corvettes. In both cases, the two Lexus cars came off worse to end an unrepresentative sixth and 10th.

World Class

It’s well known that the WeatherTech Championship features a stellar lineup of sports car drivers from around the world. There’s a certain appeal to racing in America, whether it’s the perceived laid-back paddock atmosphere and overall camaraderie, or the unique spectrum of racetracks across the U.S. In short, IMSA is a popular destination for sports car pilots.

Philipp Eng and Marco Wittmann finished second overall and in GTP at Detroit in the No. 25 BMW M Team WRT BMW M Hybrid V8. It was Eng’s 10th podium in IMSA competition, and the Austrian driver was delighted to note that believes he has earned more top-three finishes in the WeatherTech Championship than any other sports car hunting ground.

“That really cheered me up,” he said. “The team did a really good job with the strategy, bringing us in before we hit the GT traffic. My job was basically just bringing it to the end – I had the easiest job of everyone.

“Hearing all the chat on the intercom on the strategy channel, I must say, those guys are so clever,” he added. “I’m just happy that I only drive around in circles. It was a masterclass by the team.”

While Eng has competed in IMSA as a Michelin Endurance Cup driver since 2018 and run full-time in the WeatherTech Championship for the last four years, reigning Australian Supercars champion Chaz Mostert ran his first WeatherTech Championship sprint race at Detroit after five previous Michelin Endurance Cup starts that netted a class win in the 2020 Rolex 24 At Daytona International Speedway and two other podiums.

Mostert joined Toyota’s worldwide driver lineup this year, and the 34-year-old Australian was stoked to be invited to co-drive Vasser Sullivan’s No. 15 Lexus RC F GT3 “guest” GTD PRO car on the streets of Detroit with Aaron Telitz. Their podium hopes faded to a 10th-place finish in the hectic closing laps.

“This track is definitely an eye-opening experience, but the Gold Coast track in Australia is pretty gnarly too and keeps your heart in your throat,” Mostert said. “No doubt, the first few laps here in Detroit were the same.

“I’m just super-honored to be here this weekend,” he added. “To come to America and compete in an IMSA sprint race is a box I’ve wanted to check off. The Toyota family is massive in racing, and it’s always fun to drive these GT3 cars. It’s cool to say I was able to drive this Lexus.”

International Motor Sports Association Lamborghini Super Trofeo series

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