As soon as once more, IMSA has discovered a realistic answer to a lingering drawback. Following the BoP separation of the personal Porsche 963 from JDC-Miller Motorsports from the manufacturing unit entries, a GTP/Hypercar receives a weight specification exterior its authentic homologation parameters for the primary time ever—except Aston Martin beforehand ran decrease than 1,030 kg in WEC competitors, the place the BoP stays strictly confidential.
To assist the Aston Martin Valkyrie for the 6-hour race at Watkins Glen Worldwide, its minimal weight has been decreased to 1,020 kilograms, breaking the usual 1,030 kg GTP/Hypercar homologation ground.
This adjustment ought to increase the THOR-run Le Mans Hypercar (LMH), which is the one automobile on the grid that didn’t obtain updates over the winter. After a podium end on the 2025 Petit Le Mans, an Eighth-place end at Laguna Seca Raceway stands as its finest results of the season to this point.
This transformation additionally introduces a power-to-weight ratio under 1.981 kg/kW for the very first time within the historical past of the category.
Under 230 kph (143 mph): Big break for Porsche
The low-speed power-to-weight ratios for the 6 Hours at The Glen are as follows:
Aston Martin Valkyrie – 1.962 kg/kW
BMW M Hybrid V8 – 2.005
Porsche 963 outdated – 2.035
Cadillac V-Sequence.R – 2.044
Acura ARX-06 – 2.044
Porsche 963 – 2.143
Aston Martin enters uncharted territory and could be anticipated to be extremely aggressive on this setup. With the venture now in its second yr, the British model seeks its first joker updates for the upcoming winter.
Evaluating the values to Detroit reveals why the Porsche 963s lead the adjustment charts. The German automobiles acquired an important weight break for the lengthy, sweeping corners of Watkins Glen in comparison with the quick, 90-degree slow-speed corners of the Motor Metropolis:
Porsche 963 -0.108 kg/kW
Porsche 963 outdated -0.071
Aston Martin Valkyrie -0.019
BMW M Hybrid V8 +0.014
Cadillac V-Sequence.R +0.017
Acura ARX-06 +0.023
Aside from Porsche, the low-speed modifications are comparatively minor. Acura takes the most important hit with an almost 9 kW discount, whereas Cadillac loses simply over 7 kW, although each American automobiles shed 6 kilograms every.
BMW loses 1 kilogram and 4 kW, whereas Aston Martin capitalizes on its 10-kilogram weight reduction whereas retaining its full 520 kW allocation.
Evaluating this BoP to the 2025 Watkins Glen occasion reveals a stunning image, although it is very important keep in mind that all 4 LMDh automobiles (besides the 2025-spec Porsche) acquired technical updates over the winter:
Porsche 963 outdated -0.174 kg/kW
BMW M Hybrid V8 -0.099
Porsche 963 -0.066
Aston Martin Valkyrie -0.019
Cadillac V-Sequence.R +0.047
Acura ARX-06 +0.048
Regardless of remaining the heaviest GTP entries within the area at 1,058 kg (2025) and 1,073 kg (2026), Porsche beneficial properties a big increase within the lower-speed sections of the observe.
This stems from the truth that the 963 was pegged on the minimal 480 kW restrict again in 2025. This yr, the manufacturing unit automobiles obtain 20 kW extra, whereas the personal JDC-Miller entry reaches the alternative excessive at 520 kW.
BMW additionally advantages from a large achieve of over 15 kW alongside an 18-kilogram weight discount in comparison with 2025. With Aston Martin conserving its 10 kg benefit, the 2 American-built LMDh fashions face a demanding battle as the facility reductions take their toll.
Above 240 kph (149 mph): Extra high velocity for everybody!
For greater speeds on the 2026 Watkins Glen 6 Hours, the power-to-weight ratios of the automobiles are as follows:
Aston Martin Valkyrie – 1.962 kg/kW
Cadillac V-Sequence.R – 2.005
Acura ARX-06 – 2.018
BMW M Hybrid V8 – 2.044
Porsche 963 – 2.063
Porsche 963 outdated – 2.091
Whereas the baseline order matches the Detroit standings, each automobile receives a considerably stronger high-speed BoP in comparison with the twisty road circuit:
Cadillac V-Sequence.R -0.092 kg/kW
Acura ARX-06 -0.083
BMW M Hybrid V8 -0.065
Porsche 963 -0.052
Porsche 963 outdated -0.026
Aston Martin Valkyrie -0.019
The large hole between Aston Martin and the remainder of the sector shrinks significantly right here, though the Valkyrie nonetheless income from its sub-homologation weight.
Substantial energy additions for the remainder of the grid—excluding the 2025-spec Porsche, which has its 5 kW loss offset by a 24 kg weight break—give all LMDh automobiles a a lot stronger power-to-weight ratio.
Acura and Cadillac even surpass their Daytona baselines, incomes the most important high-speed breaks after dropping floor within the decrease speeds. The 2026-spec Porsche receives its most favorable high-speed power-to-weight ratio for the reason that season opener.
Concluding with the comparability to the 2025 high-speed figures, whereas bearing the winter updates in thoughts:
Porsche 963 -0.146 kg/kW
Porsche 963 outdated -0.118
BMW M Hybrid V8 -0.049
Aston Martin Valkyrie -0.019
Acura ARX-06 +0.022
Cadillac V-Sequence.R +0.024
Porsche sweeps the best beneficial properties as soon as extra. BMW additionally makes main steps ahead after a troublesome race at The Glen in 2025.
Nonetheless, the observe traits of the 2026 Porsche will distinction sharply with its 2025 predecessor, using the utmost 520 kW as a substitute of the 480 kW ground, regardless of carrying 13 kg extra.
BMW enjoys a break on all fronts with 3 kW extra energy and 18 kilograms much less weight. Aston Martin holds onto its 10 kg weight break, whereas Cadillac and Acura stay nominally forward in uncooked power-to-weight ratios however see their hole to Porsche and BMW closely decreased.
Conclusion
The whole swing within the habits of the Porsche 963 from one excessive to the opposite shall be fascinating to look at. It represents an entire black field with its options inverted from the 2025 occasion. Will the additional energy compensate for the burden enhance, or will the Penske automobiles battle with 1,073 kilograms within the lengthy, demanding corners?
Each the older-spec Porsche and the BMW M Hybrid V8 are prime contenders to look at as effectively given their large steps ahead since final yr.
Cadillac and Acura look weaker on numbers in comparison with 2025, once they had been the dominant power at The Glen. With the 2026 Cadillac V-Sequence.R working a considerably lower-downforce configuration, it stays to be seen if it may well keep aggressive on a observe the place downforce is significant.
In the meantime, Aston Martin’s record-low weight seems extra spectacular on paper than its precise on-track benefit warrants, given the sweeping enhancements handed to its rivals. Nonetheless, Watkins Glen shares clear traits with Highway Atlanta, the place the Valkyrie registered its strongest efficiency to this point.
We’re an unpredictable race with main year-over-year changes. On paper, BMW seems like the favourite and we may additionally brace ourselves for one more Laurin Heinrich masterclass within the 2025-spec Porsche.
However whether or not these numerical benefits translate into pure cornering efficiency at Watkins Glen Worldwide stays the last word query. This weekend guarantees to be an exhilarating spectacle.
BoP 2026 6 Hours at The Glen
Acura ARX-06
Min. Weight: 1,045 kg (-6 kg / +7 kg)
Max. Energy <230 kph: 511.16 kW (-8.84 kW / -8.84 kW); 685 hp
Max. Energy >240 kph: 517.92 kW (+17.68 kW / -2.08 kW); 695 hp
Max. Engine Velocity: 9,512 rpm
Max. Vitality per Stint: 911 MJ (+4 MJ / -4 MJ)
Gas Replenishment: 22.775 MJ/sec (+0.100 MJ/sec / -0.100 MJ/sec)
Aston Martin Valkyrie
Min. Weight: 1,020 kg (-10 kg / -10 kg)
Max. Energy <230 kph: 520.00 kW (+0.00 kW / +0.00 kW); 697 hp
Max. Energy >240 kph: 520.00 kW (+0.00 kW / +0.00 kW); 697 hp
Max. Engine Velocity: 8,400 rpm
Max. Vitality per Stint: 914 MJ (+5 MJ / +1 MJ)
Gas Replenishment: 22.850 MJ/sec (+0.125 MJ/sec / +0.025 MJ/sec)
BMW M Hybrid V8
Min. Weight: 1,030 kg (-1 kg / -18 kg)
Max. Energy <230 kph: 513.76 kW (-4.16 kW / +15.60 kW); 689 hp
Max. Energy >240 kph: 503.88 kW (+15.08 kW / +3.12 kW); 676 hp
Max. Engine Velocity: 8,000 rpm
Max. Vitality per Stint: 901 MJ (+5 MJ / +7 MJ)
Gas Replenishment: 22.525 MJ/sec (+0.125 MJ/sec / +0.175 MJ/sec)
Cadillac V-Sequence.R
Min. Weight: 1,032 kg (-6 kg / +2 kg)
Max. Energy <230 kph: 504.92 kW (-7.28 kW / -10.92 kW); 677 hp
Max. Energy >240 kph: 514.80 kW (+19.76 kW / -5.20 kW); 690 hp
Max. Engine Velocity: 8,800 rpm
Max. Vitality per Stint: 903 MJ (+7 MJ / -8 MJ)
Gas Replenishment: 22.575 MJ/sec (+0.175 MJ/sec / -0.200 MJ/sec)
Porsche 963 (2025 Homologation / “outdated”)
Min. Weight: 1,058 kg (-24 kg / -2 kg)
Max. Energy <230 kph: 520.00 kW (+6.24 kW / +40.04 kW); 697 hp
Max. Energy >240 kph: 505.96 kW (-5.20 kW / +26.00 kW); 679 hp
Max. Engine Velocity: 8,158 rpm
Max. Vitality per Stint: 909 MJ (-5 MJ / +34 MJ)
Gas Replenishment: 22.725 MJ/sec (-0.125 MJ/sec / +0.850 MJ/sec)
Porsche 963 (2026 Homologation)
Min. Weight: 1,073 kg (-27 kg / +13 kg)
Max. Energy <230 kph: 500.76 kW (+11.96 kW / +20.80 kW); 672 hp
Max. Energy >240 kph: 520.00 kW (+0.00 kW / +40.04 kW); 697 hp
Max. Engine Velocity: 8,158 rpm
Max. Vitality per Stint: 913 MJ (+3 MJ / +38 MJ)
Gas Replenishment: 22.825 MJ/sec (+0.075 MJ/sec / +0.950 MJ/sec)
Watch: The Rolex 24 at Daytona: Precision, Perfection, and The Highway To Victory (IMSA Endurance Racing)
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