Three GTD Pro/GTD class cars including the new BMW M4 GT3 and Chevrolet Corvette C8.R GTD have been given mid-event Balance of Performance adjustments at the Roar Before the Rolex 24.
Issued by IMSA on Saturday afternoon, one hour prior to qualifying for Sunday’s qualifying race, the BoP changes have been made “to maintain competitive equivalency” according to the sanctioning body.
The Corvette has received a 1.5 mm larger air restrictor and 3-liter increase in fuel capacity while the new-for-2022 BMW will have increased boost across all RPM levels as well as 5 additional liters of fuel.
Ferrari’s 488 GT3 Evo 2020 has also underwent changes, most notably a 30 kg addition in minimum weight and 3-degree increase in minimum rear wing angle but with a slight increase in boost levels and an added 4 liters of fuel.
The adjustments come in the wake of three timed test sessions at the Roar so far, which have seen the three manufacturers near or at the bottom of the time charts in either the GTD Pro and/or GTD classes.
It’s believed to be the first mid-event BoP change made by IMSA at the Roar pre-season test.
Sportscar365 understands that both BMW and Corvette teams had been concerned about the pace of their new or modified cars under the original BoP, which was released last week.
An additional two-hour test session is on tap for this evening following qualifying for tomorrow’s 100-minute qualifying race, which will be broadcast live on Peacock at 2 p.m. ET.