Installing Custom Vehicles on FiveM: Add-On Cars and Performance Tips

Custom vehicles are one of the most visible ways to make your FiveM server unique. But poor implementation tanks performance. Here's how to do it right.

Vehicle Types

Add-On Vehicles

New vehicles added alongside existing GTA V cars. Players can spawn them with custom model names. This is the standard approach.

Replace Vehicles

Replace existing GTA V vehicles with custom models. Players see the new model wherever the original would spawn. Risky - breaks if the replacement model has different properties.

File Structure

A typical add-on vehicle resource:

my_custom_car/
  fxmanifest.lua
  stream/
    my_car.yft    (vehicle model)
    my_car_hi.yft (high detail model)
    my_car.ytd    (textures)
  data/
    vehicles.meta
    carvariations.meta
    handling.meta
    carcols.meta

fxmanifest.lua

fx_version 'cerulean'
game 'gta5'

files {
    'data/vehicles.meta',
    'data/carvariations.meta',
    'data/handling.meta',
    'data/carcols.meta'
}

data_file 'HANDLING_FILE' 'data/handling.meta'
data_file 'VEHICLE_METADATA_FILE' 'data/vehicles.meta'
data_file 'CARCOLS_FILE' 'data/carcols.meta'
data_file 'VEHICLE_VARIATION_FILE' 'data/carvariations.meta'

Installation Steps

1. Download the vehicle from a trusted source
2. Check file structure - ensure all required files are present
3. Upload to your resources folder
4. Add to server.cfg: ensure my_custom_car
5. Restart the server
6. Test in-game: Spawn with /car modelname

Performance Impact

Each custom vehicle adds to your server's streaming budget. Impacts include:

Texture Memory

Each .ytd file contains vehicle textures. A single vehicle typically uses 8-32MB of VRAM. With 50 custom vehicles loaded, that's 400MB-1.6GB of VRAM.

Model Complexity

Custom vehicle models range from 50,000 to 500,000 polygons. GTA V's default vehicles average 70,000-100,000 polygons. High-poly custom cars reduce client FPS.

Streaming

More vehicles in the stream folder means more data the client needs to download and keep ready. Large vehicle packs (100+ cars) can cause client crashes on systems with limited RAM.

Best Practices

Quality Over Quantity

50 well-optimized custom vehicles outperform 200 poorly converted ones. When selecting vehicles:

• Check polygon count (prefer under 150,000)
• Verify texture resolution (4096x4096 is overkill for a car - 2048x2048 is plenty)
• Test each vehicle for visual glitches before adding to production

Organize by Category

[vehicles]
ensure vehicle_police_pack
ensure vehicle_emergency
ensure vehicle_civilian_sedan
ensure vehicle_civilian_suv
ensure vehicle_civilian_sports

Handling Tuning

Custom vehicles often have unrealistic handling. Adjust handling.meta:

• fInitialDriveForce: Acceleration (default cars: 0.2-0.4, customs often set to 1.0+)
• fBrakeForce: Braking strength
• nInitialDriveGears: Gear count
• fSteeringLock: Turning radius

Deduplication

Vehicle packs from different sources may include the same base vehicle with different names, wasting resources. Check model names and remove duplicates.

Server-Side Vehicle Spawning

Control vehicle spawning server-side to prevent unauthorized vehicles:

RegisterCommand("car", function(source, args)
    local player = source
    local model = args[1]
    
    -- Whitelist check
    if not IsModelAllowed(model) then
        TriggerClientEvent("notify", player, "Vehicle not available")
        return
    end
    
    TriggerClientEvent("spawnVehicle", player, model)
end)

With proper hosting on Space-Node, the NVMe SSD handles vehicle streaming efficiently, and the high RAM allocations prevent memory-related crashes during heavy vehicle usage.