Aston Martin had a disastrous preseason testing in Adrian Newey’s designed AMR26 with multiple issues originating from the Honda powerunit. Amid this, Newey’s comments about Honda’s power unit to the F1 commission have reportedly soured the relationship between the Silverstone-based team and its engine supplier.

Aston Martin announced a partnership with Honda starting with the new regulations. Honda parted ways with Red Bull after deciding to leave the sport, but then returned with Aston Martin. However, many senior engineers of the Honda F1 project joined Red Bull PowerTrains.

The AMR26 struggled during the preseason testing, with the Aston Martin being multiple seconds slower than rivals. Reliability issues were prominent with an overheating gearbox, a suffocating power unit, and vibrations damaging the battery pack.

Adrian Newey reportedly came out in front of the F1 commission, i.e., the manufacturers, the FIA, and F1 on Wednesday and made claims that the Honda power unit’s hybrid system wasn’t even reaching 250kW, whereas the regulations allow for a maximum of 350kW.

The same comments have reportedly soured the relationship between Honda and Aston Martin, as a report from Motor.es read,

“Rumors coming from Japan indicate that various people related to the project are clear that there has been a deterioration in the relationship between the team and HRC. And one of the causes would be a statement that several media have published: that Adrian Newey accused Honda of not even reaching 250 kW of electric power [the regulation allows up to 350 kW] in a meeting between manufacturers, Formula 1, and the FIA.”

An earlier report suggested that Adrian Newey’s aggressive design was suffocating the Honda power unit, which was one of the reasons behind the woes.

Honda reveals Adrian Newey’s late-stage power unit demands for Aston Martin AMR26

Adrian Newey started at Aston Martin on March 1, 2025, after serving his gardening leave. In an interview, Newey revealed how the AMR26’s development started four months after the rivals. Amid this, Honda recently revealed that Newey made some drastic demands in the late stages of power unit development.

“Since Mr. Newey came to Aston Martin in March 2025, most of what we have done so far has changed. The skeleton of the engine has not changed, but everything has changed, such as how to attach it to other peripherals and the car body,” said Satoshi Tsunoda, Honda’s F1 project general manager

“As we progressed with the development of the new car, the team requested that we make it as compact as possible and as short (in overall length) as possible, so we went with a two-tiered design. Newey asked us, ‘Can’t you do it this way?’ and we were running out of time…” he added

The Australian GP is just a week away, and Aston Martin is in danger of not meeting the 107% rule, which will stop them from entering the race.