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Dynamic track in Assetto Corsa makes the track gain grip as cars drive on it, like rubber building up on a real circuit. On your server it is set in the [DYNAMIC_TRACK] section of cfg/server_cfg.ini with four keys: SESSION_START (grip % at the start), RANDOMNESS, SESSION_TRANSFER (how much gained grip carries into the next session) and LAP_GAIN (laps needed for +1% grip).

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How dynamic track works

The track starts at SESSION_START grip, plus or minus up to RANDOMNESS. Every LAP_GAIN laps driven add 1% grip. When the session ends, part of the gained grip moves to the next session. Kunos’ example for SESSION_TRANSFER: a session starts at 90% grip and ends at 96%, so it gained 6%. With SESSION_TRANSFER=50, the next session starts at 93% (half of the 6% gain). The console confirms it at the start: DynamicTrack: first session, resetting grip.

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How to change the track grip

1

Stop the server

Stop your server.
2

Edit [DYNAMIC_TRACK]

In Files, open cfg/server_cfg.ini and change the section, for example:
3

Save and start

Save and start the server. The new grip applies from the first session.

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Example settings

These are starting points. With few players, use a low LAP_GAIN so the grip still builds.

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How dynamic track affects a race

  • Lap times drop as grip rises, so practice times are slower than race times.
  • With a high SESSION_TRANSFER, the grip built in practice and qualifying carries into the race.

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Frequently asked questions

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How do I turn off dynamic track?

Set SESSION_START=100 and RANDOMNESS=0. The track then starts at full grip.

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Why do lap times improve during a session?

Grip is building up. Each LAP_GAIN laps add 1%.

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Does a restart reset the grip?

The grip starts again from SESSION_START when the server starts. The console shows DynamicTrack: first session, resetting grip.

Assetto Corsa server guide

Every Assetto Corsa page in one place.

Practice, qualifying and race

Session lengths and laps.

Tyre wear, fuel and damage

Realism settings.

server_cfg.ini explained

Every setting in the file.
Tested by the FREAKHOSTING team on our Game Panel on 30 October 2026 (Assetto Corsa dedicated server, official Kunos acServer on Linux). Key descriptions checked against the Kunos server_cfg.ini notes reproduced in Assetto Server Manager. Steps may differ slightly if the game changes.

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Last Updated: October 2026