IMSA BoP shift boosts all GTP cars – except Aston Martin

TL;DR

The IMSA has adjusted the Balance of Performance (BoP) for GTP cars, benefiting all manufacturers except Aston Martin, which remains at its optimal limit. The changes come ahead of the next race at Laguna Seca, where Porsche and Acura see significant improvements in their power-to-weight ratios.

Key points

IMSA adjusts BoP for GTP cars ahead of Laguna Seca
Aston Martin remains at optimal performance limit
Porsche and Acura receive significant performance boosts
Acura ARX-06 gains the most power from BoP changes
Power-to-weight ratios vary significantly below and above 200 kph

IMSAAston MartinPorscheAcura

Motorsport photo The other GTP manufacturers are reeling in Aston Martin a little bit: BoP breaks for almost every manufacturer ahead of the upcoming round at Laguna Seca Raceway in Monterey. Following the tight corners of Long Beach, where heavier weight might not be as much of a problem, the IMSA WeatherTech Sportscar Championship heads to the hilly Laguna Seca Raceway as its next destination with a slightly tweaked Balance of Performance (BoP). Every manufacturer except Aston Martin, who is already at the best possible limit, will receive a more advantageous power-to-weight ratio compared to the Streets of Long Beach. In particular, the Porsche 963 lightens from its mandated 1,100 kilogram weight but remains the heaviest GTP car at 1,084 kilograms and 480 kilowatts of power below 190 kph.

Below 190 kph: Porsche still on a different level

#93 Acura Meyer Shank Racing w/Curb Agajanian Acura ARX-06: Renger van der Zande, Nick Yelloly, Aaron Telitz

#93 Acura Meyer Shank Racing w/Curb Agajanian Acura ARX-06: Renger van der Zande, Nick Yelloly, Aaron Telitz Crunching the numbers, the following picture emerges when calculating power-to-weight ratio below 190 kilometers per hour: Aston Martin Valkyrie - 1.981 kg/kW BMW M Hybrid V8 - 2.034 Cadillac V-Series.R - 2.045 Acura ARX-06 - 2.079 Porsche 963 (2025) - 2.107 Porsche 963 - 2.259 Aston Martin remains at the most advantageous level, one that the Valkyrie LMH has enjoyed since Sebring. The 2026 Porsche 963 is still held back in low-speed BoP after its higher rating for the 2026 Rolex 24. Compared to Long Beach, the following changes emerge: Acura ARX-06 -0.038 kg/kW Porsche 963 -0.033 Cadillac V-Series.R -0.025 BMW M Hybrid V8 -0.023 Porsche 963 (2025) -0.016 Aston Martin Valkyrie +-0.000 Here, Acura gets the biggest break. While only receiving a 3-kilo weight break, the ARX-06 is allowed 7.8 kilowatts more power, leading to more punch out of tight corners like Andretti Hairpin, Corkscrew and the final corner at the Laguna Seca Raceway. The 2026 Porsche receives a 0.033 kg/kW better power-to-weight ratio, which, after its monumental hit ahead of Long Beach, still puts its weight far above all other GTP cars. The two Dallara-based LMDhs of Cadillac and BMW receive a smaller break, with the 2025 Porsche receiving the smallest improvement following an encouraging performance at Long Beach. In comparison to the BoP at Laguna Seca Raceway in 2025, the following picture emerges. Keep in mind that all LMDh cars except the 2025 Porsche have been updated over the winter: Cadillac V-Series.R -0.099 kg/kW Porsche 963 (2025) -0.056 Acura ARX-06 -0.033 Aston Martin Valkyrie -0.004 BMW M Hybrid V8 +0.042 Porsche 963 +0.096 Cadillac gains nearly 0.1 kg/kW compared to last year, with the 2025 Porsche also receiving a big break. BMW, which had a very favorable power-to-weight ratio of 1.992 kg/kW back in 2025, has been reeled in again and brought to a similar level with the Cadillac V-Series.R. Of course, the 2026 Porsche 963 is still way above all power-to-weight ratios seen in 2025 and so receives the biggest penalty compared to last year.

Q&A

What is the impact of the IMSA BoP changes on GTP cars?

The IMSA BoP changes enhance the power-to-weight ratios for all GTP manufacturers except Aston Martin, which remains unchanged.

How does the Aston Martin Valkyrie's performance compare to other GTP cars after the BoP adjustment?

The Aston Martin Valkyrie maintains the best power-to-weight ratio at 1.981 kg/kW, while other manufacturers like Porsche and Acura receive significant improvements.

Which GTP car received the largest performance boost in the latest BoP adjustment?

The Acura ARX-06 received the largest performance boost, gaining 7.8 kilowatts more power despite only a 3-kilo weight reduction.

What are the power-to-weight ratios for GTP cars below and above 200 kph?

Below 200 kph, the Aston Martin Valkyrie leads with 1.981 kg/kW, while above 200 kph, the Porsche 963 has the best ratio at 2.079 kg/kW.

IMSA BoP shift boosts all GTP cars – except Aston Martin

TL;DR

Key points

Below 190 kph: Porsche still on a different level

#93 Acura Meyer Shank Racing w/Curb Agajanian Acura ARX-06: Renger van der Zande, Nick Yelloly, Aaron Telitz

Q&A

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