Honda's Turbo Lag Problem: Even After Using Second Upgrade in Madrid, Driveability on Energy-Rich Singapore Circuit Let Aston Martin Down

The first word Fernando Alonso said after the race at Singapore's Marina Bay Street Circuit was 'turbo lag'. This was the same turbo lag Honda had spent its second ADUO token of the year in Madrid to eliminate, fitting a new turbocharger to help. After the surprising Malaysia success, Aston Martin expected a repeat in Singapore, but the track that looked suited to the AMR26 on paper brought different questions for Honda's power unit.

After the race, Honda sent both engineers and power units back to Sakura for deeper investigation. No specific hardware fault emerged. What surfaced was turbo lag — the time it takes for the turbo to spool up, the gap between pressing the accelerator and feeling the turbo kick in. This is not a new problem in itself; it was one of the factors that hampered driveability with the new power unit spec introduced at Zandvoort. Precisely for that reason Honda used its second ADUO token in Madrid to introduce a new turbocharger intended to eliminate it.

But in Singapore the problem resurfaced. Honda's chief trackside engineer Shintaro Orihara told Motorsport.com, "Even though we introduced a new turbocharger to manage turbo lag, we still struggled to manage that lag in Singapore because of the unique track layout and also the energy-rich situation. That has given some unstable acceleration to the driver."

On energy-rich tracks, the MGU-K's role becomes a dilemma. MGU-K deployment usually compensates for turbo lag, but according to Orihara it works only up to a point. When it's difficult to harvest enough MGU-K power on an energy-rich circuit, the engine cannot run at a high operation point in off-throttle sections. As a result, the engine operation mode is insufficient to control turbo lag. This is a technical catch-22 that no single hardware upgrade can solve — part of the problem is tied to the track's energy-recovery capacity, over which the team has no control.

That Sakura's investigation found no specific fault could be a concern, because it suggests the same issue could arise when Aston Martin returns to an energy-rich circuit. Honda has stressed lessons have been learned and new measures are being prepared — but these are not in hardware, rather in how the power unit is operated through software and settings. Orihara said, "We understand that we need to improve our control of the turbo lag. At the moment, our control is not meeting the driver demands, so we apply some countermeasures. But we need to check how those work on our power unit."

Aston Martin chief trackside officer Mike Krack believes the Singapore disappointment was compounded because expectations were too high. Krack told Motorsport.com, "I always call them the emotional dynamics. Sepang probably surprised us in terms of outcome and it raised the expectation level maybe even beyond what was realistic. And when you do not deliver it for various reasons, everybody becomes disappointed."

Interestingly, such factors are hard to predict because driveability cannot be fully captured by simulation tools. Krack himself acknowledged that how much turbo lag or MGU-K cut-off costs in driveability is beyond simple sensitivity simulations.

The counter-intuitive point is that Singapore's disappointment gave Aston Martin a lesson no technical upgrade could deliver. Krack called it a mental lesson — managing expectations better and having a set of risks defined in advance, which wasn't done in Singapore. In other words, the team lost the weekend fighting its own expectations more than its technical limits.

Now the question is how far Honda's software-based solution will work when Aston Martin heads to Austin. The circuit-specific turbo lag problem could surface there too, since it is tied to energy conditions, not one piece of hardware. Honda has no new turbocharger or token left, only better control — and when a power unit's lag collides directly with driver demand, the question is whether settings can do what the Madrid upgrade could not.