Setup work is systematic rather than intuitive, and each adjustment has a defined effect.
Springs
Controlling how much the car moves under load.
Which affects aerodynamic platform and mechanical grip together.
Dampers
Controlling how quickly it moves.
Which is where transient behaviour is tuned.
Anti-roll bars
Distributing load between wheels in cornering.
Which is the primary balance adjustment.
Geometry
Camber, toe and caster affecting tyre contact.
Which is set for the circuit and the tyre.
The order to work in
Ride height and geometry first, then springs, then bars, then dampers.
Which reflects how much each affects the others.
Adjusting dampers to fix a problem caused by the wrong spring rate is a common and frustrating way to waste a test session.
Understeer and oversteer
Balance adjusted primarily through anti-roll bar stiffness.
Which is the fastest change to make between sessions.
Kerbs and bumps
Compliance needed for circuits with rough surfaces.
Which conflicts with aerodynamic platform control.
Fuel load effects
Balance changing as the car gets lighter.
Which setups have to accommodate across a stint.
Amateur application
The same principles apply on a track day car with far fewer adjustments available.
What each adjustment actually does
Springs set how far the car moves, dampers set how fast, bars set how the movement is shared between wheels, and geometry sets how the tyre meets the road through all of it.
Which is a clean division that setup discussion frequently muddles.
Understanding which of the four is responsible for a symptom is most of the diagnostic skill.
Damper adjustment
Bump and rebound, high and low speed.
Which are separate controls on developed systems.
Corner weights
Balancing load across the four wheels.
Which is set on scales before an event.
Tyre temperature as feedback
Across-tread temperatures indicating camber and pressure correctness.
Where to start on a road car
Alignment and tyre pressures before anything else.
Diagnosing before adjusting
Establishing whether a handling complaint occurs on entry, mid-corner or exit before changing anything.
Which narrows the likely cause immediately.
Entry problems point at front geometry and brake bias, mid-corner at balance and roll stiffness, exit at differential and rear grip.
One change at a time
Testing changes individually to know what did what.
Which is slow and is the only way to build a usable setup.
Baseline setups
Known configurations to return to.
Which prevents getting lost.
Driver preference
Two drivers wanting different balance from the same car.
Which is normal and legitimate.
Recording everything
Setup sheets logged for every session.
A note on sources and figures
Technical detail in motorsport is unusually well documented in some areas and closely guarded in others. Regulations, safety standards and championship structures are published openly by governing bodies. Setup data, aerodynamic figures and strategy models are competitive assets and are not.
What circulates publicly about the guarded material comes from team personnel speaking in general terms, from technical journalists with paddock access, and from the small amount that emerges through regulation disputes. It is generally directionally right and rarely precise, and anything quoted as an exact figure should be treated with some caution.
Why any of this matters to a spectator
Motorsport is more interesting when you can see what is actually being decided. A driver lifting on a straight, a team pitting a lap earlier than expected, a car running a visibly different wing setting from its team mate: each of those is a choice with reasoning behind it.
Broadcast coverage has become much better at explaining this than it once was, and there is a limit to what fits between corners. Knowing the underlying mechanisms fills the rest in, and it turns a procession into something considerably more absorbing.
Where to look for more
Governing body technical and sporting regulations are freely available and are the authoritative source on what is and is not permitted. Specialist technical journalism, engineering society publications and books by former engineers cover the underlying principles properly. Team media output is informative and is promotional material rather than documentation.
One correction worth making
Motorsport coverage tends to attribute outcomes to individual brilliance, because that is the better story. Most results are produced by preparation, process and a large number of people who never appear on screen.
Both accounts are partly true, and the second one explains considerably more of what actually happens over a season. The drivers themselves are usually the first to say so, and it rarely makes the highlights package.
Further reading
Books written by working engineers and team personnel are the best accessible source on this, and several are written for general readers rather than for specialists. Governing body regulations are dry and are the definitive answer to most questions about what teams are and are not allowed to do.
A closing observation
Almost everything in this sport that looks like a single dramatic decision turns out, on inspection, to be the visible end of a long process that was mostly settled beforehand.
That is true of pit stops, of strategy, of car performance and of driver careers. It makes the sport less romantic to describe and considerably more interesting to understand.