How Driver Changes in Endurance Racing Actually Work

Watch a 24 hour race closely and you will see it at almost every pit stop: the door opens, one driver unclips and climbs out, another drops in, and the car is gone again in well under a minute. Driver changes in endurance racing look chaotic on television. Up close they are one of the most rehearsed moves in the sport, and they decide more races than most fans realise.

I have spent nights in the pit lane at club endurance events and many more nights running driver swaps in online leagues. The two worlds share more than you would expect. Here is what actually happens during a driver change, why the rules shape strategy, and what sim racers can borrow from it.

Why Endurance Races Need Driver Changes at All

No one can drive a prototype at full attack for 24 hours. Concentration drops after two to three hours, reaction times slow, and mistakes creep in at night. So endurance cars run with crews of two to four drivers who share the seat.

Rules also force the sharing. At Le Mans, a driver may not spend more than four hours in the car within any six hour window, and there is a cap of around 14 hours of total driving across the race. Other series set minimum drive times per driver, so a team cannot simply leave its fastest driver in all day. That turns driver rotation into a strategic puzzle as much as a physical necessity.

What Happens Inside the Pit Box, Step by Step

A typical change in a closed cockpit car follows roughly this order, with every person knowing their exact job:

The car stops on its marks. The outgoing driver has already loosened the belts on the in lap, if the rules allow.
A crew member opens the door. The driver unplugs the radio and drink tube, then climbs out.
The incoming driver is already standing at the door with helmet on and gloves fastened. They drop in, often with a personal seat insert pushed in first.
A crew member reaches in to fasten the belts and reconnect radio and drink.
Refuelling and any tyre change happen around this, depending on what the regulations allow at the same time.

A well drilled swap takes about 6 to 10 seconds of the stop. A clumsy one can take 20, and over a race with 30 stops that adds up to more than a lap.

The Hidden Problem of Different Body Sizes

A crew might pair a 1.68 metre driver with one who is 1.92. Same car, same seat shell. Teams solve this with removable foam inserts moulded to each driver, adjustable pedal boxes on some cars, and steering wheels set up so every button is reachable for everyone.

The compromise is real. The tallest driver often sits lower than they would like and the shortest one stretches for the pedals. Teams usually optimise the car for the driver who will spend the most time in it, and the others adapt.

Why the slowest driver still matters

In classes with mixed driver ratings, such as amateur categories where a less experienced driver must complete a minimum stint, the race is often won by the team whose slowest driver loses the least time. A professional who is two tenths faster than a rival matters less than an amateur who is two seconds faster than another amateur.

How Driver Changes Shape Race Strategy

Teams do not change drivers at every stop. Fuel stints may last around 45 minutes to an hour, but a driver often stays in for a double or triple stint. Fewer changes mean fewer slow stops, and a driver who has settled into the rhythm is usually quicker on the second stint than the first.

Choice	Benefit	Cost
Change every stop	Fresh driver, steady pace	Extra seconds every stop
Double stints	Fewer swaps, driver in rhythm	Fatigue late in the stint
Triple stints at night	Best driver on a cool track	Risk of mistakes after 2.5 hours

Teams also plan who drives when. The quickest drivers often take the start, the cold early morning hours when grip is high, and the final stint. Under a safety car period, many teams take the chance to change drivers because the time lost in the pits shrinks.

Where Common Advice About Pit Stops Gets It Wrong

Fans often assume the fastest pit stop wins. That is the Formula 1 habit of mind, where two second tyre changes are celebrated. In endurance racing, a stop that is three seconds slower but avoids a dropped belt, a missed radio plug or a penalty for an unsafe release is the better stop. Penalties for infringements in the pit lane, such as a drive through, cost far more than any time saved.

The best crews aim for consistency, not records. The comparison between the two worlds comes up often in the piece on what real motorsport pit crews do differently from sim racers.

What Sim Racers Can Learn From Real Swaps

Online endurance leagues now run full driver changes, where one teammate hands the car to another over the network. The real world lessons translate directly:

Agree on settings beforehand. Brake bias, traction control and fuel maps should be noted for each driver so nobody changes them by accident on the out lap.
Brief the next driver. Tell them about tyre wear, any damage, and where the track has rubbered in or got slippery.
Plan stint lengths against fatigue. Most people concentrate well for 60 to 90 minutes in a sim, not three hours.
Practise the handover itself. Connection drops during swaps are common; test the process before race day.

If you are new to league racing in general, start with what rookies get wrong in their first league race before trying a team event.

FAQ

How long does a driver change take in endurance racing?

The swap itself takes roughly 6 to 10 seconds for a well practised crew. The whole pit stop takes longer because of refuelling and tyre changes.

Can one driver drive the entire 24 hours?

No. Major series cap individual driving time and set minimums for each driver, so every crew member must take their share of the race.

Why do drivers loosen their belts before the pit stop?

It saves a few seconds during the change. Where allowed, drivers start loosening belts on the slow pit lane approach so they can climb out quickly.

Watch the Door, Not the Tyres

Next time you watch an endurance race, ignore the wheel gun for one stop and watch the door instead. Count the seconds from door open to door closed and compare teams. You will quickly see which crews have drilled the handover and which are hoping for the best. More stories from real racing sit in the motorsport section.