How Pit Stop Strategy Can Win or Lose a WEC Race

In Formula 1, pit stops are usually over in a matter of seconds. A fresh set of tyres, a quick getaway and hopefully a position gained. But in the World Endurance Championship (WEC), things are a little more complicated. Pit stops aren't just about changing tyres. They're about managing fuel, energy, drivers and, perhaps most importantly, time.

Over a six-hour race, or even the 24 Hours of Le Mans, a well-timed pit stop can help a team leapfrog its rivals without ever overtaking them on track. And sometimes, the fastest car isn't necessarily the one with the best chance of winning.

So how exactly do teams use pit stops to their advantage?

Are Pit Stops Mandatory in WEC?

Unlike Formula 1, where drivers must normally use at least two different dry tyre compounds during a dry Grand Prix, WEC doesn't have a fixed number of mandatory pit stops or a standard pit-stop window.

Instead, stopping is a necessity. Cars simply cannot complete six, eight or 24 hours of racing on a single tank of fuel, and tyres need to be managed throughout the race.

That gives teams considerable freedom to decide when to stop, how much fuel to take on, whether to change tyres and when to swap drivers. There are strict regulations governing how pit stops are carried out, including engine shutdown, crew limits and refuelling procedures, but the strategy itself is largely up to the teams.

And that's where things get interesting.

Fuel Management: Why One Extra Lap Can Make a Difference

One of the biggest factors determining WEC pit strategy is fuel consumption. In the Hypercar class, teams must also manage something called the virtual energy tank.

Essentially, each Hypercar is given a maximum amount of energy it can use during a stint, measured in megajoules (MJ). This allowance is determined through the Balance of Performance (BoP) regulations, which aim to keep different manufacturers competitive.

The system measures energy delivered through the powertrain, including the contribution of hybrid systems where fitted. Once that energy allowance has been used, the car needs to replenish it during a pit stop.

And here's the catch: having physical fuel left in the tank doesn't necessarily mean a car can continue racing indefinitely. The team must manage both its actual fuel supply and its permitted energy usage.

Drivers can help extend their stints by lifting off the throttle earlier before corners, known as lift-and-coast, or adjusting how aggressively they use the car's power. These small savings can add up over several hours.

Why does that matter? Imagine two cars running similar lap times. One can consistently travel an extra lap before stopping, while the other has to pit earlier. Across a long race, that flexibility could help the first team avoid an additional stop, shorten its final refuelling stop or take advantage of a safety car period.

Those are potentially race-changing advantages, even if neither car is noticeably quicker on track.

The Undercut and Overcut: Gaining Positions Without Overtaking

If you watch Formula 1, you'll probably be familiar with the undercut and overcut. Both strategies exist in WEC, but fuel loads, traffic and tyre management make the calculations more complicated.

An undercut happens when a team pits earlier than a rival, hoping to gain enough time on fresh tyres or in clearer air to emerge ahead once its competitor stops.

The overcut works in the opposite direction. A team stays out longer, hoping that its existing tyres and track position allow it to run faster than a rival that has already stopped.

In WEC, however, fresh tyres aren't always part of the equation. Teams may decide to keep the same tyres through several fuel stops, particularly if the tyres are performing well. That means the advantage can come from pit timing, fuel strategy or avoiding slower traffic rather than tyre performance alone.

And because Hypercars and LMGT3 cars share the circuit, traffic is another consideration. A driver stuck behind slower cars could lose valuable time, while a rival enjoying clean air may be able to make the most of their strategy.

The important thing to remember is that the car leading on track isn't necessarily the car effectively leading the race. Until the different pit-stop cycles play out, the order can be misleading.

Why Teams Don't Change Tyres at Every Stop

Another major difference from F1 is that WEC teams don't necessarily fit fresh tyres every time they pit.

Tyres in endurance racing are designed to last much longer, and drivers can complete multiple fuel stints on the same set. This is known as double-stinting or triple-stinting the tyres.

There is a tactical advantage to doing so. Under the 2026 WEC procedures, routine refuelling and tyre-changing operations are separate, meaning teams can save valuable stationary time by skipping a tyre change.

But there's a trade-off. As tyres wear, performance can deteriorate, particularly on circuits that are hard on the rubber. Teams therefore have to calculate whether the time saved in the pits outweighs the potential loss of pace on track.

A team might leave the pits ahead because it didn't change tyres, only to lose that advantage later when its rival begins closing in on fresher rubber.

Driver Changes: Another Part of the Strategy

Unlike F1, where one driver completes the entire race, WEC cars are shared between drivers. Teams must therefore manage not only the car's performance but also who's behind the wheel and for how long.

In the LMGT3 category, which combines professional and amateur drivers, minimum driving times are particularly important. During a standard six-hour race, Bronze- and Silver-rated drivers have a minimum driving-time requirement of one hour and 45 minutes, subject to the applicable regulations.

This means teams can't simply leave their fastest professional driver in the car for most of the race. They have to plan when each driver will take over, balancing the rules with fatigue, track conditions and race position.

Sometimes a driver will complete two or three fuel stints before handing over to a teammate. Other times, a team may bring a driver change forward to take advantage of a neutralisation or avoid putting a less-experienced driver into particularly difficult conditions.

At Le Mans, the challenge becomes even greater. Teams need to consider night driving, changing temperatures and driver fatigue, while respecting strict maximum driving-time limits.

It's another reason why pit strategy in endurance racing can be so complicated. The person driving the car at any given moment can be just as important as the tyres fitted to it.

How Safety Cars Can Turn a Race Upside Down

One of the biggest opportunities for gaining positions comes when racing is neutralised.

Under normal racing conditions, entering the pits costs a significant amount of time compared with cars travelling at racing speed. But during a Full Course Yellow or Virtual Safety Car, competitors on track are moving much more slowly.

That can reduce the relative time lost by making a pit stop, potentially giving a team a substantial advantage over rivals that stopped under green-flag conditions.

Of course, it's not quite that simple. Pit-lane access and permitted work can be restricted during certain neutralisation procedures, particularly under a Safety Car. Teams must therefore respond quickly while ensuring they comply with the rules.

There's also an element of luck. A team might be perfectly positioned to pit just as a caution is called, while another may have stopped moments earlier and lost valuable time.

Over six hours, these moments can completely reshape the running order. Over 24 hours, they can be even more influential.

Endurance Racing Is About More Than Being Fast

Perhaps the biggest difference between F1 and WEC is how teams approach the bigger picture.

A Formula 1 team might be trying to find a few seconds over a 60-lap Grand Prix. In WEC, strategists are constantly recalculating their plans over hundreds of laps, accounting for fuel consumption, energy allowances, tyre wear, traffic, changing weather and driver availability.

A team might deliberately sacrifice track position early in the race to give itself a better chance later. It might stretch a fuel stint, skip a tyre change or adjust its driver rotation, all in the hope that those decisions pay off several hours down the line.

And that's what makes endurance racing so fascinating. It's not always the car that's fastest over a single lap that wins. Sometimes, it's the team that makes the smartest decisions when it matters most.