Summary of GTP Power-to-Weight Ratio Changes (2025 vs 2026)
This text details the Balance of Performance (BoP) adjustments for the GTP class cars heading into the 2026 season, comparing them to the 2025 BoP. Here’s a breakdown of the key takeaways:
Overall trends:
* Narrower Gaps: The power-to-weight ratios are generally closer together in 2026 compared to 2025,indicating a tighter competitive field.
* Notable Updates: all four cars (Cadillac, Acura, BMW, Porsche) have undergone ample aerodynamic updates, making direct comparisons challenging.
* Speed-Dependent Adjustments: BoP is adjusted based on speed ranges (below 230 kph and above 240 kph), reflecting different aerodynamic characteristics and performance profiles.
Car-Specific Changes:
* Cadillac V-series.R: Received a significant BoP adjustment, likely to address struggles in 2025 (being 0.581 seconds slower than the fastest lap).It saw a reduction in power-to-weight ratio in both speed ranges, and a reduction in maximum stint energy, despite a power increase.
* Acura ARX-06: Experienced slight reductions in power-to-weight ratio in both speed ranges.
* BMW M Hybrid V8: Received the least favorable adjustment, with a slight increase in power-to-weight ratio in the lower speed range and a more substantial increase in the higher speed range. This is likely due to the extensive bodywork updates, with IMSA aiming to prevent it from dominating.
* Porsche 963: Regained performance in the high-speed range, achieving a power-to-weight ratio below 2.0. It saw reductions in power-to-weight ratio in the higher speed range and is the only car allowed to carry more energy, likely to compensate for a power increase.
* Aston Martin Valkyrie: Benefits from a favorable BoP, particularly in the high-speed range, due to its draggy design. It wasn’t included in the 2025