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IMSA Confirms Porsche BoP Changes for Road America

Porsche 911 RSR among cars in latest round of BoP adjustments…

Photo: John Dagys

Photo: John Dagys

IMSA has issued clarifications to the Balance of Performance adjustments for the Porsche 911 RSR ahead of next weekend’s Continental Tire Road Race Showcase at Road America.

Released in an amended bulletin late Friday, the GT Le Mans class Porsche 911 RSR will run with a 1 mm larger air restrictor, instead of the 0.6 mm increase that was originally listed prior to Indianapolis.

Additionally, the German manufacturer will be permitted to utilize a 50 mm front splitter instead of the originally confirmed 25 mm increase, while also benefiting from a 3 liter increase in fuel capacity and 1 mm larger refueling restrictor.

IMSA’s Scot Elkins told Sportscar365 the pre-Indy adjustments were incorrectly listed in the previous bulletin, with the clarification correcting the original error.

The pair of Porsche North America entries did not run with any of the BoP changes at Indy due to an issue sourcing the newly mandated reconfigured rear wing in short notice. Per IMSA rules, a team must utilize all of the changes or none at all.

It’s expected all three of the 911 RSRs, including the Team Falken Tire entry, will be in the new configuration for Road America.

Other BoP changes include the GTLM class BMW Z4 GTE receiving a 1 mm larger refueling restrictor, while both the Ferrari 458 Italia GT3 and Audi R8 LMS cars in GT Daytona gain 3 liters of fuel capacity and larger refueling restrictors as well.

The Riley HPD, meanwhile, has reappeared on the BoP table in the Prototype class and will be permitted to use a 33.7 mm air restrictor, the same size utilized in the car’s last outing at Sebring.

The Starworks Motorsport-run entry completed a successful test at Road Atlanta earlier this week, although it’s unclear if the team will be ready for next weekend’s Road America round.

John Dagys is the founder and Editor-in-Chief of Sportscar365. Dagys spent eight years as a motorsports correspondent for and SPEED Channel and has contributed to numerous other motorsports publications worldwide. Contact John


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