Michelin made its IMSA racing return to The Raceway on Belle Isle Park in Detroit this past weekend for the first time since 2008. While some rain affected setup and take-down, on-track sessions were unaffected.

Here are additional post-race notebooks from Daytona, Sebring, Long Beach and Mid-Ohio.

DPi

• Acura has won back-to-back races in DPi for the first time with the ARX-05. It marks Acura’s first back-to-back wins in IMSA since Detroit and Watkins Glen in 2017. That year, Katherine Legge and Andy Lally shared the Michael Shank Racing NSX GT3 in GT Daytona. Acura was also the last non-GM brand to win overall in Detroit, in 2008.
• The wins are Team Penske’s first back-to-back wins in sports car racing since Sebring and St. Petersburg to start 2008 in the American Le Mans Series, with the Porsche RS Spyder.
• Dane Cameron last won back-to-back races at Canadian Tire Motorsport Park and Road America in the Whelen Engineering Corvette DP in 2016. That year, he and Eric Curran won the championship.
• As for Juan Pablo Montoya, it’s been a while since he’s gone back-to-back to win races. He won consecutive Rolex 24 At Daytona races in 2007 and 2008. Prior to that, he won the 2000 Indianapolis 500 and then at Milwaukee a week later in separate Indy car series. His rookie season in Champ Car, 20 years ago in 1999, Montoya won three races in a row on two occasions. The second of those started at Mid-Ohio, a race after he’d scored pole at Detroit. Pole at Detroit and a win at Mid-Ohio 20 years later driving for the same affiliated brand (Honda in Champ Car, Acura in IMSA) is something to behold.
• The No. 5 Mustang Sampling Cadillac DPi-V.R led a single lap at Detroit. After leading 752 of 1,014 laps through the first three races, the Cadillacs have only led a combined 1 of the last 181 laps in Mid-Ohio and Detroit.
• Just 17 points cover the top five in DPi after Detroit. DPi is the only class of this race that counted for the full-season WeatherTech Championship.
• JDC-Miller Motorsports had its best result yet this season with finishes of fourth and fifth place for its two Cadillacs.
• CORE autosport finished seventh with its Nissan DPi. The team seeks to dial in its new-for-2019 car following a series of tests in-between Watkins Glen and Detroit.
• Contact from other cars left Mazda an unrepresentative 10th and 11th, a race after both cars were on the podium in Mid-Ohio.

GTD

• For the first time this year in GT Daytona, the car that led the most laps in the race won the race. The No. 14 AIM Vasser Sullivan Lexus led 30 of 56 laps. Jack Hawksworth passed Patrick Long’s Park Place Porsche after a restart.
• The wins are Lexus’ first back-to-back with the RC F GT3 car in IMSA.
• Magnus Racing had its best Detroit finish yet with fourth place. After some recent tests and the team delivering a clean weekend with its Lamborghini Huracan GT3 Evo, Andy Lally said, “We’ve had some incredibly fruitful tests in recent weeks and our pace is the great reward for that. The crew really earned this for us between our pace and excellent pit work, it’s been a lot of fun.”
• Defending GTD champions Paul Miller Racing also rebounded to a top-five finish. Ryan Hardwick gotgoing despite contact at the first corner and Bryan Sellers making a late pass of Ryan Dalziel for sixth.
• Dalziel and Parker Chase brought the Starworks Motorsport Audi to sixth place, its best finish of the year.
• WeatherTech Sprint Cup entrants Lone Star Racing (Mercedes-AMG) and Compass Racing (McLaren) improved from their Mid-Ohio season debuts. They ended seventh and eighth in Detroit. The Compass team rebuilt its chassis after an incident in Friday practice.
• Turner Motorsport nearly scored a podium but retired inside the final five minutes with transmission issue.
• Meyer Shank Racing endured a challenging race with a pit stop delay, then incident for its No. 86 Acura and contact from another car nudging the No. 57 Acura into a spin. The No. 86 pairing still leads the full-season GTD standings though since this race only counted for the WeatherTech Sprint Cup.