Brand-new Daytona Prototype internationals from two manufacturers are expected to be on the grid for January's Rolex 24 At Daytona and, in an encouraging sign from the IMSA series, two additional DPi programs are said to be moving forward with a longer development window.The upcoming, factory-commissioned DPis from Cadillac and...

Bentley hasn't been involved with prototype sports car racing since the Le Mans-winning Speed 8 of 2001-'03, seen here at the Goodwood Festival of Speed. But a new chapter could be starting. (LAT photo) Bentley motorsports director Brian Gush has been a vocal supporter of IMSA's new-for-2017 P2-based plans, and...

In case you missed any of them, check out RACER's Tech Talk overviews of the four new P2 cars to make their debuts so far in 2015:

The TUDOR United SportsCar Championships begins with American endurance racing's version of The Big Game – the Rolex 24 at Daytona. While the 24-hour race is important, it doesn't necessarily tell the story of the season, especially for the P2 cars in the Prototype category. While the P2 cars certainly...

Mazda Motorsports Director John Doonan tells The RACER Channel about the team's yearlong development program with its diesel-powered P2 cars, how far they've come since the prototypes were introduced in November of 2013, and how they're working to win the messaging and promotions game while searching for more speed.

All photos by Marshall Pruett With more downforce coming to Daytona Prototypes for the rest of the season, IMSA is considering an upgrade in suspension technology to help DP teams cope with the change. DP teams tried the full 2014 aero package prior to the Rolex 24 at Daytona, which...

IMSA, sanctioning body for the TUDOR United SportsCar Championship, is currently conducting a post-event crash investigation with the Corvette DP driven by Memo Gidley and the Ferrari F458 piloted by Matteo Malucelli.According to Scot Elkins, IMSA's vice president of competition and technical regulations, both cars were impounded by IMSA after...

Data from the test gave IMSA the numbers it needed to make some hard calls. (Marshall Pruett photos) The TUDOR United SportsCar Championship's dress rehearsal last week at the Roar Before The 24 has helped IMSA tech boss Scot Elkins to gather the final data points needed to lock down...

ESM car courtesy of the team. Ganassi, RSR PC courtesy of DIS. Select TUDOR United SportsCar Championship Prototype teams completed the second part of a two-day private test at Daytona International Speedway, working through aerodynamic, tire, weight and power alterations made to the Daytona Prototypes and P2 cars in attendance.DP...

The Gary Nelson-led Action Express Racing team was the first of the 2014-spec Daytona Prototypes to turn laps today at Sebring, rolling out right as the 8 a.m. session began, and based on the feedback offered by driver Joao Barbosa, the new DP package is a success. ?From inside the...