What is the racing line in go-karting?

The racing line is the fastest path through a corner. It runs from a braking point while the kart is straight, to a turn-in point, to an apex on the inside of the corner, and out to an exit point. Driving it well is the biggest piece of free speed available to any driver.

What does slow in, fast out mean?

It means giving up a little entry speed into a corner so you can get the kart turned and pointed at the exit sooner, then accelerate earlier and harder. The speed you carry onto the following straight matters far more than the speed you carried into the corner.

Driving TechniqueFIELD GUIDE // 6 MIN READ

The Racing Line: How To Drive A Corner

The racing line is the fastest path through a corner, and it is the largest piece of free speed available to any driver. It costs nothing, it just has to be understood.

A Corner Has Four Parts

Every corner, on every track, breaks into the same four points. Learn to see them and a confusing ribbon of asphalt turns into a series of simple problems.

Braking pointWhere you start slowing down, while the kart is still straight.
Turn-in pointWhere you begin to steer into the corner.
ApexThe point where you run closest to the inside of the corner.
Exit pointWhere the kart unwinds back out to the edge of the track, accelerating.

Slow In, Fast Out

The instinct is to carry as much speed as possible into a corner. The instinct is wrong. The corner that matters is the one feeding the longest straight, and what wins a straight is the speed you carry onto it, not the speed you carried into the corner before it.

So you give up a little entry speed, get the kart turned and pointed at the exit early, and then you can accelerate sooner and harder. "Slow in, fast out." It feels backwards for about a lap, and then it feels obvious.

The Late Apex

Beginners turn in early and clip the apex too soon. It feels natural and it is slow: an early apex sends you running wide at the exit, off the throttle, fighting the kart.

Aim for a slightly later apex. Turn in a fraction later, brush the inside a little further around the corner, and the track will open up in front of you on exit. A later apex straightens the exit, and a straighter exit means earlier throttle and more speed everywhere after it.

Connect The Corners

A fast lap is not a string of perfect individual corners. It is a flow. A corner that leads onto a straight is worth sacrificing for, because exit speed compounds down the whole straight. A corner that only leads to another corner matters less.

Walk the track or watch a few laps before you drive. Find the corners that feed the long straights. Those are the ones to get right. Everything else is just connecting them.

Reference Points Make It Repeatable

A fast lap you cannot repeat is luck. To make it repeatable, pick visual reference points: a mark on the track, a patch in the asphalt, a sign. Brake here, turn there, apex at that point.

With references, you stop guessing and start adjusting. You can move a braking point a kart-length later and feel exactly what it did. That is the difference between driving fast once and driving fast on demand.

The Short Version

Every corner has four parts: braking point, turn-in, apex, and exit.
Slow in, fast out. Exit speed onto a straight beats entry speed into a corner.
Aim for a slightly late apex to straighten and speed up your exit.
Prioritize the corners that feed the longest straights.
Use fixed visual reference points so a fast lap becomes repeatable.