How a lot will the Porsche 963 should be slowed all the way down to deliver again thrilling competitors within the IMSA SportsCar Championship? Following the 1-2 end on the 12 Hours of Sebring, officers are bringing out the heaviest hammer of their arsenal.
For the primary time within the historical past of the whole Hypercar/GTP laws, a automobile is receiving essentially the most unfavorable power-to-weight ratio potential: 480 kilowatts at 1,100 kilograms. The utmost further weight for LMDh automobiles was elevated to a most of 70 kilograms by the Worldwide Vehicle Federation (FIA) forward of the 2024 season, on the time as a result of Toyota GR010 Hybrid dominating the World Endurance Championship (WEC).
Now, the unfavourable most score is being utilized for the primary time in IMSA. Porsche Penske Motorsport must compete within the important velocity vary as much as 190 km/h (completely different reference values apply on avenue circuits than on everlasting race tracks) with a power-to-weight ratio of two.292 kg/kW, or 480 kilowatts at 1,100 kilograms. In distinction, the Aston Martin Valkyrie continues to obtain essentially the most favorable power-to-weight ratio potential of 1.981 kg/kW.
The burden penalty in comparison with Sebring is at least 45 kilograms or 99 kilos for Porsche. With its dominance, Penske has now pushed the officers to the restrict, because the laws don’t enable for greater than 1,100 kilograms. It is going to be fascinating to see what occurs with this stability of efficiency within the city canyons of Lengthy Seaside.
For the primary time, there’s additionally a separate BoP for JDC-Miller Motorsports’ previous-year Porsche. It receives a considerably extra average BoP than the 2026 963s of the Penske manufacturing facility staff. The “you’re all in the identical boat” precept not applies. The completely different homologation statuses of the automobiles make this potential.
Classification as much as 190 km/h: BMW advantages essentially the most
When it comes to power-to-weight ratio, the load allocation for the GTP automobiles at Lengthy Seaside is as follows:
1. Aston Martin Valkyrie – 1.981 kg/kW
2. BMW M Hybrid V8 – 2.057
3. Cadillac V-Sequence.R – 2.070
4. Acura ARX-06 – 2.117
5. Porsche 963 (2025) – 2.123
6. Porsche 963 (2026) – 2,292
After all, Porsche’s energy discount is dominating the headlines. There has by no means been a blow like this within the historical past of the Hypercar laws. Even the non-public Porsche should take successful.
It’s nearly simple to miss that Acura can also be taking fairly successful. The ARX-06 can be eight kilograms heavier and obtain ten kilowatts much less energy. With a 15-kilogram weight penalty and one kilowatt extra energy, the Cadillac V-Sequence.R nearly stands out because the winner.
BMW, nevertheless, comes out on high: Whereas the M Hybrid V8 should add 11 kilograms, it additionally beneficial properties almost 7 kilowatts of energy.
The explanation for the load achieve of the opposite GTP automobiles is probably going the Aston Martin Valkyrie, which couldn’t actually sustain at both Daytona or Sebring. As talked about earlier, its classification stays at the very best power-to-weight ratio of 520 kilowatts at 1,030 kilograms.
Adjustments for the 2026 12 Hours of Sebring. It’s essential to notice that the low-speed vary there went as much as 230 km/h, not 190 km/h because it does now:
1. BMW M Hybrid V8 -0.006 kg/kW
2. Aston Martin Valkyrie +-0.000
3. Cadillac V-Sequence.R +0.025
4. Porsche 963 (2025) +0.047
5. Acura ARX-06 +0.057
6. Porsche 963 (2026) +0.215
The BMW M Hybrid V8 is thus the one GTP automobile to obtain a greater score than it did at Sebring. The Aston Martin retains its very best score, whereas all different GTP automobiles obtain a much less favorable power-to-weight ratio.
After all, Porsche’s 0.215 kg/kW stands out. Neither in IMSA nor within the WEC has there ever been such a drop in efficiency between two races.
In 2025, Porsche dominated the race in a battle with BMW, whereas Cadillac and Acura remained within the shadows. Listed here are the modifications from the earlier 12 months, although they need to be taken with a grain of salt as a result of all LMDh automobiles acquired updates final winter. Moreover, the 230 and 240 km/h velocity limits had been nonetheless in impact in 2025, so direct comparability is restricted.
1. Cadillac V-Sequence.R -0.072 kg/kW
2. Aston Martin Valkyrie -0.070
3. Acura ARX-06 -0.042
4. Porsche 963 (2025)+0.008
5. BMW M Hybrid V8 +0.057
6. Porsche 963 (2026) +0.177
Cadillac tops this listing, although that is largely attributable to a somewhat unfavorable classification in 2025. The identical applies to Acura and Aston Martin, which was nonetheless comparatively new on the time. Though BMW is best labeled in comparison with Sebring, its classification at Lengthy Seaside is definitely considerably worse than the earlier 12 months.
Inside simply three races, a exceptional hole has emerged between the person autos: Whereas on the season opener in Daytona, all autos within the low velocity vary as much as 230 km/h had been inside 0.017 kilograms per kilowatt, the distinction between Porsche and Aston Martin is now a most of 0.311 kg/kW.
Classification above 200 km/h
Because of the low threshold of simply 200 km/h, this vary is kind of related, particularly on the lengthy full-throttle part throughout the beginning/end line:
1. Aston Martin Valkyrie – 1.981 kg/kW
2. Cadillac V-Sequence.R – 2.095
3. Acura ARX-06 – 2.097
4. BMW M Hybrid V8 – 2.102
5. Porsche 963 (2026) – 2.115
6. Porsche 963 (2025) – 2.123
As soon as once more, the numerous hole between Aston Martin and the opposite producers is putting. The Valkyrie has excessive aerodynamic drag and subsequently requires quite a lot of downforce. Consequently, the power-to-weight ratio will increase for many of the different GTP automobiles.
In comparison with Sebring, the modifications are as follows, once more with the caveat that these values apply right here beginning at 200 km/h, whereas in Sebring they apply solely beginning at 240 km/h:
1. Acura ARX-06 -0.001
2. Aston Martin Valkyrie +-0.000
3. Cadillac V-Sequence.R +0.010
4. BMW M Hybrid V8 +0.026
5. Porsche 963 (2026) +0.026
6. Porsche 963 (2025) +0.034
Acura is the one producer to obtain a barely higher score above 200 km/h than at Sebring. Aston Martin retains its very best score, whereas all different GTPs are additional restricted.
And the modifications in comparison with final 12 months, once more with the beforehand talked about limitations (updates, velocity ranges):
1. Aston Martin Valkyrie -0.062 kg/kW
2. Acura ARX-06 +0.043
3. Cadillac V-Sequence.R +0.053
4. Porsche 963 (2026) +0.058
5. BMW M Hybrid V8 +0.059
6. Porsche 963 (2025) +0.066
The 2026 Porsche swings from one excessive to the opposite when it comes to engine energy: it’s allowed to attract the utmost permitted 520 kilowatts above 200 km/h. Consequently, the earlier 12 months’s Porsche truly loses barely extra in power-to-weight ratio within the higher velocity vary than the present Porsche.
Translated from German
GTP BoP Values at a look
Values in parentheses = Change from Sebring 2026/Lengthy Seaside 2025 (Word concerning energy specs: The bounds had been set at 230 and 240 km/h for each Sebring 2026 and Lengthy Seaside 2025)
Acura ARX-06
Minimal weight: 1,059 kilograms (+8/-1)
Max. energy <190 km/h: 500.24 kW (-9.88/+9.24); 680 hp
>Max. energy at 200 km/h: 504.92 kW (+4.16/+13.92); 686 hp
Max. RPM: 9,512 revolutions per minute
Max. vitality per stint: 901 megajoules (+3/-2)
Gasoline circulate throughout refueling: 22.525 megajoules per second (+0.075/-0.050)
Aston Martin Valkyrie
Minimal weight: 1,030 kilograms (+-0/-8)
Max. energy <190 km/h: 520.00 kW (+-0/+14.00); 707 hp
Max. energy at 200 km/h >: 520.00 kW (+-0/+14.00); 707 hp
Max. RPM: 8,400 revolutions per minute
Max. vitality per stint: 913 megajoules (+1/+11)
Gasoline circulate throughout refueling: 22.825 megajoules per second (+0.025/+0.275)
BMW M Hybrid V8
Minimal weight: 1,059 kilograms (+11/+29)
Max. energy at <190 km/h: 514.80 kW (+6.76/-0.20); 700 hp
Max. energy at 200 km/h >: 503.88 kW (-3.00/-11.12); 685 hp
Max. RPM: 8,000 revolutions per minute
Max. vitality per stint: 908 megajoules (+8/+9)
Gasoline circulate throughout refueling: 22,700 megajoules per second (+0.200/+0.225)
Cadillac V-Sequence.R
Minimal weight: 1,058 kilograms (+15/+2)
Max. energy at <190 km/h: 511.16 kW (+1.04/+18.16); 695 hp
>Max. energy at 200 km/h: 504.92 kW (+4.68/+18.16); 686 hp
Max. RPM: 8,800 revolutions per minute
Max. vitality per stint: 906 megajoules (+11/+3)
Gasoline circulate throughout refueling: 22.650 megajoules per second (+0.275/+0.075)
Porsche 963 (2025)
Minimal weight: 1,060 kilograms (+5/+11)
Max. energy <190 km/h: 499.20 kW (-8.84/-9.80); 679 hp
>Max. energy at 200 km/h: 499.20 kW (-5.72/-11.83); 679 hp
Max. RPM: 8,158 revolutions per minute
Max. vitality per stint: 906 megajoules (+4/+7)
Gasoline circulate throughout refueling: 22.650 megajoules per second (+0.100/+0.175)
Porsche 963 (2026)
Minimal weight: 1,100 kilograms (+45/+51)
Max. energy <190 km/h: 479.96 kW (-28.08/-29.04); 653 hp
>Max. energy at 200 km/h: 520.00 kW (+15.08/+8.96); 707 hp
Max. RPM: 8,158 revolutions per minute
Max. vitality per stint: 913 megajoules (+11/+14)
Gasoline circulate throughout refueling: 22.825 megajoules per second (+0.275/+0.350)
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