Audi are set to enter F1 in 2026, but they could already be on the back foot after missing out on an engine regulation loophole that Mercedes and Red Bull have reportedly taken advantage of.
The German manufacturer will make its first appearance this season, having completed a takeover of Sauber to establish themselves as a factory team. Unlike new entrants Cadillac, who will run Ferrari power units, Audi have developed their own engine for the start of the 2026 regulations.
The technical overhaul for 2026 is significant. Formula 1 is moving away from the current rules by increasing the electrical share of power from a previous 20/80 split in favour of ICE to an even 50/50. On top of that, they’re removing the MGU-H and switching to sustainable fuels.
Audi have been working on their first F1 engine at their Neuburg facility since 2022. Despite their efforts, they’ve joined Ferrari and Honda in raising concerns that Mercedes and Red Bull may have exploited a gap in the new regulations.
Audi Won’t Stand for Mercedes and Red Bull Using the 2026 Engine Loophole All Year
There are concerns that Mercedes and Red Bull have found a way to push their internal combustion engines beyond the 16:1 compression ratio limit, up to 18:1. Red Bull maintain their setup is within the rules, pointing out that the FIA only tests compliance at ambient temperature.
The potential advantage from this could be significant — estimated at three to four tenths of a second per lap, depending on how power-dependent the circuit is. Manufacturers plan to discuss possible solutions with the FIA ahead of pre-season testing in Barcelona.
Audi technical director James Key has made it clear that he expects any loopholes around engine compression ratios to be closed off quickly. He warned that allowing some teams to benefit would force others into a lengthy redevelopment process just to catch up.
Key told Autosport: “We have to, as we do, trust the FIA with making the right decisions here. It’s new regs. You’ve got to have a level playing field.
“If someone came up with a clever diffuser and you said it’s not the right thing to do, no one else can have it, but you can have it for the rest of the year? It doesn’t make sense. We’d never accept that.”
FIA Can’t Force Red Bull and Mercedes to Build New Engines Before the 2026 F1 Season
According to The Race, engine manufacturers who haven’t already taken advantage of the 2026 rule loophole allowing for increased compression rates may not be able to introduce a new power unit until the following year.
The FIA also doesn’t have time to require Red Bull and Mercedes to redesign their engines before the 2026 season kicks off. The engines teams have now are likely what they’ll use when racing starts in Australia on March 8.
As Key mentioned, one option could be letting Red Bull and Mercedes keep their current engines for 2026 but requiring changes for 2027. However, this approach could lead to significant performance gaps between teams throughout the year.
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