Andrea Stella discusses the ongoing straight-line speed challenges faced by Lando Norris following the Bahrain GP qualifying session.

Stella detailed the technical aspects related to Norris' power unit problem but acknowledged that diagnosing it is challenging due to the complexities of the current regulations and multiple influencing factors. For example, a deployment problem would be easier to detect, whereas a mechanical issue beyond the scope of sensors would be tough to pinpoint. 

The Italian estimates that this situation is costing Norris approximately 0.1 to 0.2 seconds per lap, a notable deficit considering the tight margins involved in qualifying for this weekend's Bahrain GP in Malaysia.

"I think we should specify that the problem we observe on Lando's car pertains to a lack of straight-line speed. In the power-limited section, the car accelerates slightly less and reaches a marginally lower top speed, all other parameters being equal," Stella elaborated.

"We are talking about probably a difference of one to two kilometers per hour, which may seem minor and is difficult to detect. However, as soon as Lando, for instance, benefits from a little slipstream from a car four seconds ahead, you see Lando outpacing the other car. 

Lando Norris, McLaren

"So, it’s a small difference but one we observe statistically, and we should more accurately address the lack of straight-line speed, which we can quantify as a lap time loss exceeding one-tenth of a second, possibly between one and two-tenths of a second. 

"A separate discussion revolves around the reasons behind this, and while we can immediately consider a power deficiency, there can be various contributing factors. 

"As mentioned, it is somewhat more challenging to monitor what is transpiring from a power unit perspective, as we would be able to see it if it were a deployment issue; it might relate to other parameters."

Stella emphasized that external factors could have nothing to do with the power unit itself and was eager to avoid a scenario where his comments could be interpreted as placing blame on Mercedes' High Performance Powertrains division. 

The primary issue appeared to be mostly confined to the latter part of the lap, where Piastri managed to achieve higher top speed compared to Norris between Turns 13 and 14, and subsequently on the back straight leading to Turn 15. 

"However, there are aspects of the power unit that depend on the chassis dynamics, and ultimately, there may be factors related to the car's drag," Stella continued.

"At no point are we making a definitive statement about the power unit; we are merely addressing the lack of straight-line speed, which we feel it is important to highlight - because it’s fair to Lando that we acknowledge the lap time deficit on his car that we have yet to resolve over the last couple of events. 

"But we are certainly examining all potential parameters and will consider further adjustments, although we can only implement those changes for Singapore at this point."

Additional reporting by Filip Cleeren.