IMSA has made a significant change to its practice of applying Balance of Performance changes to its Prototype class, starting at WeatherTech Raceway Laguna Seca.
For the first time since the dual DPi and WEC spec P2s were combined in 2017, IMSA will apply BoP to the P2s, which breaks from an informal agreement held between the series and the ACO/FIA to refrain from speeding up or slowing down the spec cars. The changes are designed to slow the P2s, which have won three straight WeatherTech SportsCar Championship rounds.
IMSA has added 10 kilograms of weight to all P2 models, and has reduced the fuel capacity from 75 liters to 72L, in an attempt to bring the DPis back into a more competitive form to close the season during the two final races.
“We feel like we’ve gotten to the point where this is a more common sense approach,” said IMSA’s Geoff Carter. “The only stipulation [with the ACO/FIA] is we don’t BoP between [P2] cars. We’ve had this latitude this whole time.”
Since January of 2017, WEC P2s have served as the baseline for all BoP adjustments in Prototype, and most notably, to use as the performance standard for DPi BoP. That practice has ended with the Monterey decision.
“We felt it was time to make a change to that platform,” Carter added. “We’ve always said we’d balance against the best of the P2s. And we’re changing that.”
IMSA has also give additional fuel to the four DPi models, and assisted Mazda, only, with its RT24-Ps for the upcoming race at WeatherTech Raceway Laguna Seca.
“We’ve given all four brands plus two liters of fuel to their capacity, and from their performance, we’ve taken 10 kilos off the Mazdas,” Carter said.
IMSA’s new P2 BoP philosophy only applies to Monterey and the season finale at Road Atlanta in October. P2s and DPis will race in separate classes starting in 2019, giving Carter and IMSA’s technical staff a new set of performance balancing considerations to develop.