Daytona Beach, Florida, January 9, 2026 – IMSA has thrown down the gauntlet, mirroring the World Endurance Championship (WEC) with stricter rules around discussing the Balance of Performance (BoP). Drivers, teams, and manufacturers now face potential penalties for publicly criticizing or attempting to influence BoP decisions.
New Regulations Aim to Curb BoP Commentary
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The move comes as IMSA prepares for the 64th Rolex 24 at Daytona, a race where even the smallest advantage can mean the difference between victory and defeat.
- The new rules, outlined in Article 2.2.3 (“Conduct and Communications”) of the Sporting Regulations, prohibit public comments on the BoP process.
- IMSA officials have sole discretion in determining violations, regardless of intent.
- Penalties can be applied before, during, or after an IMSA competition.
- While BoP is less critical in IMSA than WEC, it remains a vital factor, especially at Daytona.
The regulations state that manufacturers, competitors, drivers, and constructors are barred from influencing the BoP or making public statements about its process, methodology, data, or outcomes—whether through traditional media, digital platforms, or social media. IMSA will determine violations at its discretion, and penalties can be levied at any point during a competition.
While the BoP often plays a secondary role in IMSA compared to the WEC, it’s still a crucial element, particularly at Daytona International Speedway. Frequent Full Course Yellows often mean race outcomes hinge on tire strategy, pit stop execution, and sheer determination during restarts.
IMSA utilizes a two-stage BoP system, differing slightly from the WEC’s fixed 250 kph threshold. Instead, IMSA employs a transition zone between 230 kph and 240 kph, where power adjustments occur linearly. This system was introduced in 2025. Daytona’s high speeds make both power ranges significant, with performance above 240 kph being key for overtaking.
BoP for the 2026 Daytona 24 Hours (GTP)
Establishing the 2026 BoP proved challenging, as all four LMDh cars received substantial updates. A test at Daytona in November, combined with simulation data, provided IMSA technicians with initial benchmarks.
GTP Power-to-Weight Ratio <230 kph
- Cadillac V-Series.R – 1.987 kg/kW
- Acura ARX-06 – 2.002
- BMW M Hybrid V8 – 2.004
- Aston Martin Valkyrie – 2.005
- Porsche 963 – 2.029
The Acura, BMW, and Aston Martin are closely matched in this range. Cadillac currently boasts the best ratio, while Porsche trails slightly.
GTP Power-to-Weight Ratio >240 kph
- Aston Martin Valkyrie – 1.981 kg/kW
- Porsche 963 – 1.998
- BMW M Hybrid V8 – 2.035
- Cadillac V-Series.R – 2.046
- Acura ARX-06 – 2.057
Porsche recovers ground lost at lower speeds, achieving a power-to-weight ratio below 2.0 in the higher speed range. The Aston Martin benefits from the most favorable BoP in this sector, unsurprising given its draggy design and reliance on top-end power, as demonstrated at Le Mans.
BoP Adjustments Compared to 2025
Significant data changes exist compared to last year, but direct comparisons are difficult due to extensive car updates, including aerodynamic modifications. Therefore, these figures should be interpreted cautiously.
Changes vs 2025 (below 230 kph):
- Cadillac V-Series.R: -0.133 kg/kW
- Acura ARX-06: -0.013
- BMW M Hybrid V8: +0.023
- Porsche 963: +0.025
Changes vs 2025 (above 240 kph):
- Porsche 963: -0.085 kg/kW
- Acura ARX-06: -0.031
- Cadillac V-Series.R: -0.024
- BMW M Hybrid V8: +0.042
The BMW M Hybrid V8 appears to have received the least favorable adjustment, especially considering its extensive updates—roughly 50 percent new bodywork. IMSA likely aims to prevent the revamped car from dominating immediately. Conversely, the Cadillac BoP adjustment is surprising, given the V-Series.R’s significant updates, including a striking low rear wing.
However, it’s important to remember that Cadillac struggled with its 2025 Daytona BoP. The fastest V-Series.R lap was 0.581 seconds slower than the overall fastest lap, largely due to a high base weight of 1,060 kg, which has now been reduced.
A look at maximum stint energy reveals reductions for most GTP cars. The Cadillac stands out, despite its power increase below 230 kph. The Porsche 963 is the only exception, allowed to carry more energy—likely to compensate for its nearly 10 kW power increase in the upper speed range.
IMSA is playing it safe, incorporating lessons from last year. Given the extensive updates, the BoP remains somewhat of an educated guess.
Detailed GTP BoP
(Numbers in parentheses = Change from previous year)
Acura ARX-06
- Minimum Weight: 1,041 kg (-7)
- Max Power <230 kph: 520 kW; 707 hp
- Max Power >240 kph: 505.96 kW (+4.16); 688 hp
- Max RPM: 9,512 rpm
- Max Energy per Stint: 899 MJ (-2)
- Refueling Flow Rate: 22.475 MJ/sec (-0.100)
Aston Martin Valkyrie
- Minimum Weight: 1,030 kg
- Max Power <230 kph: 513.760 kW; 699 hp
- Max Power >240 kph: 520 kW; 707 hp
- Max RPM: 8,400 rpm
- Max Energy per Stint: 913 MJ
- Refueling Flow Rate: 22.825 MJ/sec
BMW M Hybrid V8
- Minimum Weight: 1,038 kg (+8)
- Max Power <230 kph: 517.92 kW (-2.08); 704 hp
- Max Power >240 kph: 510.12 kW (-6.76); 694 hp
- Max RPM: 8,000 rpm
- Max Energy per Stint: 903 MJ (-8)
- Refueling Flow Rate: 22.575 MJ/sec (-0.200)
Cadillac V-Series.R
- Minimum Weight: 1,033 kg (-27)
- Max Power <230 kph: 520 kW (+20); 707 hp
- Max Power >240 kph: 504.92 kW (-7.08); 687 hp
- Max RPM: 8,800 rpm
- Max Energy per Stint: 896 MJ (-13)
- Refueling Flow Rate: 22.400 MJ/sec (-0.325)
Porsche 963
- Minimum Weight: 1,035 kg (-7)
- Max Power <230 kph: 517.92 kW (-2.08); 704 hp
- Max Power >240 kph: 510.12 kW (+9.88); 694 hp
- Max RPM: 8,158 rpm
- Max Energy per Stint: 903 MJ (+5)
- Refueling Flow Rate: 22.575 MJ/sec (+0.125)
