Change vehicle handling like a pro

Vehicle handling is the difference between a car that feels planted and one that slides into every wall. FiveM lets you tune every physics parameter through handling.meta. Use a local test server and keep a backup so each change can be compared and reversed.

You'll build: A modified handling.meta for any vehicle - tweak mass, traction, suspension, and top speed with repeatable test drives.
Time: ~25 minutes
You need: A local FiveM server, a carpack or add-on vehicle, and a text editor.
You'll learn: What each handling parameter does (mass, traction, suspension, braking, acceleration), how to read handling.meta, how to compare changes on a test server, and what changes improve control vs what breaks physics.

BEFORE YOU START

Build it

Read the current handling

You know what each parameter controls.

Open data/handling.meta in your carpack. Find the <handlingName> for your vehicle:

code

<handlingName>s98</handlingName>
<fMass value="1400.000000" />
<fInitialDragCoeff value="9.500000" />
<fPercentSubmerged value="60.000000" />
<vecCentreOfMassOffset x="0.000000" y="0.000000" z="-0.100000" />
<vecInertiaMultiplier x="1.000000" y="1.000000" z="1.000000" />

Key parameters:

fMass - vehicle weight in kg. Higher = heavier, slower acceleration, more stable
fInitialDragCoeff - air resistance. Higher = lower top speed
fPercentSubmerged - how much of the car is underwater before it floats
vecCentreOfMassOffset - shifts center of gravity. Negative Z = lower, more stable

Traction and suspension are in sub-nodes:

code

<fTractionCurveMax value="2.400000" />
<fTractionCurveMin value="2.000000" />
<fSuspensionForce value="1.400000" />
<fSuspensionReboundDamp value="1.800000" />

Tune mass and traction

The car feels heavier or lighter as you intend.

To make a car more stable (less spin-outs):

code

<fMass value="1600.000000" />  <!-- was 1400 - heavier, more planted -->
<fTractionCurveMax value="2.800000" />  <!-- was 2.4 - more grip -->

To make a car more agile (drifty, responsive):

code

<fMass value="1100.000000" />  <!-- was 1400 - lighter, more nimble -->
<fTractionCurveMin value="1.500000" />  <!-- was 2.0 - less grip at limit -->

Rule: change one parameter at a time. Test. Then change the next. If you change 5 values at once and the car flips over, you won't know which one caused it.

Compare one change on your test server

You can compare the edited handling with your original settings.

Back up handling.meta before editing. Change one value, save the file, then restart your local test server and reconnect. Spawn a fresh copy of the vehicle so you are not testing an existing entity with old handling data.

Drive the same route at similar speeds. Record the value you changed and what happened during acceleration, braking and cornering. Restore the backup and repeat if the result is worse. Do not restart a live player server for a handling experiment.

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