Lesson 1: Foundations: how tuning works

Why tune it yourself

A setup sheet from a forum, or from a chatbot, was built for one car, one set of tires, one track and one driver. Change any of those and the numbers stop meaning what they meant. Even the slider ranges differ: every car in GT7 has its own minimum and maximum for most settings, so "set it to 3.2" can land in a totally different place on your car.

What carries over is the logic. If you can say "my car understeers mid-corner" and you know which levers move the balance toward the rear, you can fix any car in a few short test runs. That is the whole goal of this course: you diagnose, you choose one change, you check it.

You need three ideas to get there: the phases of a corner, the two ways a car loses grip, and how weight moves around the car. Then you need to know where GT7 keeps the controls.

Corner phases, understeer and oversteer

Every corner has three phases, and you diagnose a handling problem by phase, because the fixes are different in each.

1. Entry (braking and turn-in). From the brake point until you come off the brakes. Weight is on the nose.
2. Mid-corner (apex). The balanced part around the apex, at steady or neutral throttle. The car is at its cornering limit.
3. Exit (throttle). From the first squeeze of throttle until the wheel is straight. Weight moves to the rear.

Understeer: the front gives up first

Understeer means the Front tires reach their limit before the rears. From the cockpit, you add steering and nothing more happens: the car keeps running toward the outside, the wheel may feel light, and you have to wait or lift before it turns. On the replay, the front wheels point into the corner but the car travels on a wider, straighter line.

Oversteer: the rear gives up first

Oversteer means the Rear tires let go first. The tail steps out, the car rotates more than you asked, and you catch it with opposite lock or by easing the pedals. On the replay, the car points further into the corner than the line it is following.

Neither is "wrong" in small doses. A touch of rotation on entry often helps you turn; a touch of push on exit keeps a powerful car stable. You are tuning for a balance you can trust, phase by phase. So before you change anything, say the problem out loud in this form: phase + which end. "Entry understeer." "Exit oversteer." That sentence is your diagnosis.

Weight transfer: where the grip goes

The car's mass sits above the road, so every time you brake, accelerate or turn, load moves between the four tires. The car's total weight never changes; only how it is shared does.

• Braking loads the front. The nose dives, the Front tires gain load and grip, and the Rear tires go light.
• Throttle loads the rear. The car squats, the rears gain load for traction, and the fronts lose load, so the steering goes lighter.
• Cornering loads the outside. The body rolls, and the outside tires carry most of the work while the inside tires unload.

A loaded tire grips more, but less efficiently

Press a tire harder into the road and it grips more, but not in proportion. Double the load and you get noticeably less than double the grip. Engineers call this tire load sensitivity, and it explains most of what the setup does.

Now picture one axle in a corner. If the two tires share the load evenly, they make the most grip together. If more load moves to the outside tire, the outside tire gains a little grip but the inside tire loses more, so the axle as a whole grips less. That gives you the master rule of balance:

Weight transfer also explains classic driver-made balance. Trail-braking into a corner keeps load on the nose, so the front bites and the light rear helps the car rotate on entry; brake too hard while turning and the rear lets go. Lifting off the throttle mid-corner throws load forward and unloads the rear, which is why some cars snap into lift-off oversteer. Getting on the throttle unloads the front, so a car that was fine at the apex can understeer on exit. A rear-drive car can also overpower its rear tires and slide on exit despite the extra load.

The four levers of balance

Total weight transfer is set by the car's mass, its center-of-gravity height and how hard you brake, accelerate and corner. The setup mostly decides how that transfer is shared, how fast it happens, and how well each tire uses the load it gets. That gives you four groups of levers, each with its own lesson.

Don't memorize the table yet. Each lesson takes one row and explains the front effect and the rear effect separately. For now, just notice that every lever shifts the same thing: which end of the car reaches its limit first, and in which phase.

Where GT7 keeps the settings

Make settings sheets a habit. Keep one sheet as your known-good baseline and Duplicate Sheet before you experiment, then give the copy a name that says what you changed. If the experiment fails, you switch back in two button presses instead of trying to remember five numbers.

Parts unlock settings

GT7's manual puts it simply: the more parts you buy from the Tuning Shop, the more settings become available. The shop is split into Sports, Club Sports, Semi-Racing, Racing and Extreme. Which tier sells a given part can vary, so look in the Suspension and Drivetrain sections of the shop for your car.

The split between the two adjustable suspension parts follows player reports rather than the manual, so if a slider is missing, check which suspension part is fitted. Race cars such as Gr.3 and Gr.4 models usually come with adjustable suspension and an adjustable LSD already fitted, which makes them great cars to learn on.

One related lever you'll meet later is the brake balance. If you shift Front/Rear Balance toward the rear, the car usually rotates more on entry and can feel nervous under hard braking; shift it toward the front and the car feels more stable but pushes more on entry. The in-game wording on this setting is easy to misread, so verify the direction with a quick test on your car.

PP, BoP and locked-down events

Your edits can move PP

Performance Points (PP) are a simulated rating of the car's performance, driven by things like top speed and acceleration. Polyphony's own guide names "stiffening your suspension" as a choice that affects it, so suspension and diff edits can push your PP up or down. That matters in events with a Max. PP Limit: a few clicks of tuning can take you over.

• After any edit, check the PP figure in Car Settings.
• If PP shows a "!", it was not calculated properly and counts as invalid. Press Triangle in Car Settings to recalculate. PP-limited races need a valid PP.
• PP is simulated and can change with game updates, so recheck saved setups after a big patch.

Balance of Performance and tuning locks

With Balance of Performance (BoP) on, Gr.1, Gr.2, Gr.3, Gr.4 and Gr.B cars have their weight and power adjusted, and installed tuning parts are returned to stock. BoP comes in three types, for high-, medium- and slow-speed tracks. Other cars are restored to their default state. In practice, your carefully built sheet may not apply at all.

In online lobbies, the host controls this with BoP/Tuning Forbidden (On or Off). When it is On, a further Tuning option can be set to "No Limit" or "Prohibited". Rooms can also set a Max. PP Limit (up to 1000), a tire type, limits on tuning parts and a drivetrain filter. Which settings stay open in a given Sport-mode or event race varies, so read the regulations screen before you spend time on a setup.

The test loop: one change at a time

Tuning is an experiment, and an experiment only works if you control everything except the thing you are testing. Here is the routine the rest of this course assumes:

1. Fix the conditions. Same track, same tires, same fuel and weather, same driving line. Time trial or practice is ideal.
2. Set a baseline. Duplicate your sheet, then drive three clean laps. Write down your best time and, more importantly, what the car does in each phase: "slight entry understeer at the hairpin, rear loose on exit at the last corner."
3. Make one change. One setting, one end of the car, a clear step. Write it on the sheet name or in your notes.
4. Drive three more laps. Lap one is for getting used to it. Judge on laps two and three, and judge the feel in the phase you were trying to fix, not just the lap time.
5. Keep it or revert it. Better: keep it and pick the next change. Worse or no different: revert to the baseline sheet. A change that made no difference was a wasted variable; take it out.

Which order to tune in

GT7's official magazine, Beyond the Apex, sets the platform first, does compression before rebound, and treats toe and the anti-roll bars as final tweaks. This course turns that into an order that works from big foundations down to fine balance:

1. Ride height and springs (Body Height Adjustment, Natural Frequency): set the platform first.
2. Dampers: Damping Ratio (Compression) first, then Damping Ratio (Expansion).
3. Alignment (Negative Camber Angle, Toe Angle): toe in tiny steps, front first.
4. Anti-roll bars and the differential as fine-tuning tools for balance and traction.

That order matters because the early steps change what the later ones are doing. Rebalancing with the anti-roll bars before the springs are right is like adjusting your mirrors before you've set the seat.