Red Bull was willing to let Ricciardo's engine fail in Monaco F1 race

Christian Horner refused to let the Red Bull Formula 1 team retire Daniel Ricciardo from the lead of the Monaco Grand Prix even if it meant his engine failed

Red Bull was willing to let Ricciardo's engine fail in Monaco F1 race

An MGU-K failure early in the race meant Ricciardo lost 120kW (roughly 160bhp) of power from the energy recovery component, and he was forced to manage extreme rear brake temperatures and avoid using seventh or eighth gear.

Red Bull considered getting Ricciardo to retire but Horner explained later he was adamant it needed to continue even though that decision carried a significant risk.

"He reported a sudden loss of power, and the engine guys could see from the data that the MGU-K had stopped completely," said Horner.

"At that point there was talk in the background of retiring the car.

How Ricciardo eclipsed a Schumacher classic

"With the potential damage with the MGU-K, it can go into the [combustion] engine and then it's a whole load of other problems.

"My position was 'we're leading the Monaco Grand Prix, we'll run until this engine stops'."

The MGU-K harvests energy under braking and is fundamental to the performance of the whole ERS package.

Losing its assistance puts more duress on the rear brakes, and Horner revealed the rear brake temperatures rose so much in the immediate aftermath of the MGU-K failure that they were "not far off going on fire".

To combat this Ricciardo shifted the brake bias of his Red Bull forward by "6-7%", three times as much as might be shifted during a normal race, and employed more lift-and-cost into corners.

"There were three laps where he pushed really hard in the corners because he was nervous about how slow he was at the end of the straights," said Horner.

"We just left him alone for a few laps to find a rhythm. He has all the brake temperatures and warnings that he can see on the dash, so he was just trying to get those under control.

"You could hear he was asking for a lot of information about Max's tyres, how they were lasting, which was the tyre that gave up first; he was asking about [Nico] Hulkenberg, how far did his tyres go [in the opening stint].

"He also had the capacity to be thinking about the global picture."

Ricciardo topped every practice session and qualifying segment in the build-up to the race.

Horner said he was "so focused" during that domination that "there was no way he was going to let this victory slip through his fingers".

"It was important for him to keep his cool, keep track position, don't kill the tyres, don't kill the brakes, don't kill the engine, and bring it home," said Horner.

"Monaco's special for any driver, but that put heightened emphasis on this race because of the disappointment of two years ago [when a botched pitstop cost Ricciardo victory].

"It was great that he was able to make up for that."

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