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Vehicle Backfire & Ignition (WD1)

Source: community notes, author not recorded. Values below were tested in game by the original author; they are a loose-file integration guide, still marked WIP there.

Covers three separate tweaks to the same vehicle XMLs: restoring backfire, fixing the backfire sound, and making ignition sound realistic.

Vehicle XMLs involved:

  • Vehicle_Police.xml
  • Vehicle_Speed.xml
  • Vehicle_Agile.xml
  • Vehicle_Offroad.xml
  • Vehicle_Muscle.xml
  • Vehicle_Traffic.xml
  • Vehicle_Bike.xml

Vehicle backfire​

  1. Open the XML(s) and search for BackfireSettings.
  2. You will find multiple blocks. Replace each one, one by one, with the matching template below.

Speed, Agile, Traffic, Police​

<BackfireSettings
    fBackfireRpmChangeMinSpeed="1000.0"
    fBackfireRpmChangeSpeedLag="0.25"
    vec2BackfireRpmRange="4000.0,10000.0"
    bBackfireRpmIsUp="0"
    bBackfireRpmIsDown="1"
    bBackfireNonPlayer="0"
    fBackfireFireChance="5.0" />

Muscle, Offroad​

<BackfireSettings
    fBackfireRpmChangeMinSpeed="1000.0"
    fBackfireRpmChangeSpeedLag="0.25"
    vec2BackfireRpmRange="4000.0,10000.0"
    bBackfireRpmIsUp="0"
    bBackfireRpmIsDown="1"
    bBackfireNonPlayer="0"
    fBackfireFireChance="4.0" />

The only difference between the two is fBackfireFireChance (5.0 vs 4.0).

Bikes​

Bikes rev up to the 20,000 range, so the RPM window has to be widened:

<BackfireSettings
    fBackfireRpmChangeMinSpeed="1000.0"
    fBackfireRpmChangeSpeedLag="0.25"
    vec2BackfireRpmRange="4000.0,20000.0"
    bBackfireRpmIsUp="0"
    bBackfireRpmIsDown="1"
    bBackfireNonPlayer="0"
    fBackfireFireChance="5.0" />

Exhaust fire sound​

Applies to Speed, Bike, Agile, Offroad, Police, and some Muscle cars.

  • Some Muscle cars have their own distinct exhaust fire sounds worth keeping.
  • Find the FF nulled values and replace them with 61 4A. FF means no sound, so the backfire is silent until you do.
  • The Speed XML does have its own sound values, but they are very weak, so replace them with 61 4A as well.

  1. Search for sndExhaustFireSound.

  2. Change its value:

    sndExhaustFireSound="61 4A"

Realistic ignition​

Every car with hiding support has a distinct ignition and turn-off sound. Syncing the normal ignition to the hiding one makes startup feel more authentic, and raising the engine start time to 2.75 s makes the audio line up with the animation.

Important: if sndEngineIgnitionFromHiding or sndTurnOffEngineWhileHiding is FF, leave that vehicle alone. FF means the car does not use the hiding mechanic, so there is nothing to copy.

For each XML:

  1. Search for fEngineStartTime and replace it with fEngineStartTime="2.75".

  2. Search for sndEngineIgnitionFromHiding or sndTurnOffEngineWhileHiding. You will find this block:

    sndEngineIgnition=""
    sndEngineIgnitionFromHiding=""
    sndTurnOffEngine=""
    sndTurnOffEngineWhileHiding=""

  3. Copy the "FromHiding" values over the normal ones:

    • sndEngineIgnitionFromHiding → sndEngineIgnition
    • sndTurnOffEngineWhileHiding → sndTurnOffEngine