The Canadian Tire Motorsport Park-winning Chevrolet Camaro GT4.R and Mercedes-AMG GT4 that was victorious last time out at Lime Rock Park have been hit with Balance of Performance adjustments ahead of this weekend’s IMSA Michelin Pilot Challenge race at Road America.
Both cars will head into Saturday’s two-hour race with a 20 kg increase in minimum weight, with the Mercedes also getting a 3-liter reduction in fuel capacity following Hugh Plumb’s fuel-saving run that took he and Team TGM co-driver Owen Trinkler to victory at Lime Rock.
BoP changes have been made to three other GT4-spec cars in the GS class.
The Ford Mustang has been given a 10 kg weight increase, although offset by a 2 mm larger air restrictor and 1-liter fuel capacity boost.
McLaren’s 570S GT4, meanwhile, has been given a 10 kg weight break with the 2019-spec Porsche 718 Cayman GT4 Clubsport getting the biggest break with a 25 kg decrease in minimum weight.
The Porsche is now the lightest GT4 car in the field by 35 kg over the next-lightest, the previous-gen Aston Martin Vantage GT4.
Bumper Grid for Road America
A total of 37 cars are entered for the seventh round of the season, including a 24-car GS class field.
It includes a second PF Racing Mustang GT4 for Jeff Courtney and Fred Roberts, and several drivers still to be confirmed in the Automatic Racing Aston Martins.
Kuno Wittmer’s co-driver in the No. 75 Compass McLaren GT4 is also yet-to-be-announced after two races driving with Paul Rees.
The 13-car TCR class features a number of other changes as well, including Chris Miller in for Mikey Taylor in the No. 17 JDC-Miller Motorsports Audi RS 3 LMS TCR, which claimed class victory at CTMP.