Engine stability fix

Engine Shake & RPM Bounce fix

This mod improves engine shake and RPM bounce, two issues that in the current game version v. 260123-02 are not related to actual car condition and cannot be solved using vanilla game mechanics.

What this mod does

• []Reworks engine shake so it is based on piston wear, not static values.

  []Fixes excessive RPM bounce caused by a static Vacuum Throttle value.

  Engine Shake Rework

  In vanilla game, engine shake uses fixed minimum and maximum values (±8) and applies force based on flywheel mass, which causes constantly shake.

  A constant, strong engine shake even on a brand-new engine is confusing and little bit unrealistic.

  For players using force-feedback wheels, this constant shake makes the car nearly undrivable due to continuous steering wheel vibration.

  This mod recalculates shake min/max values, while the game continues to apply shake using flywheel mass and RPM.

  Engine Shake Modes:

  Pistons Balance

  • []Pistons are split into two groups: (1–3) and (4–2)

    []Wear is calculated for each group

    []The wear difference between groups is used to calculate new minimum and maximum shake force

  Worst Piston
  • []Finds the piston with the highest wear

    []Uses that piston’s wear value to calculate new minimum and maximum shake force

  Manual
  • []Shake force is set manually using a slider

    []No wear calculations are applied

  Disabled
  • []Engine shake behavior is unchanged

    []Default game values are used (min/max = ±8)

  Engine Shake Settings

  These settings control how much force can be applied:

  • []Minimum Shake Value

    Base vibration always applied, representing natural engine imbalance[]Maximum Shake Value

    Maximum shake force for a heavily worn engine[]Sharpness

    Controls how quickly shake grows with wear:

    []Lower value → shake appears earlier and smoother

    []Higher value → shake appears later but becomes much stronger on heavily worn pistons

    
    Manual Force Slider
    • []Used only in Manual mode

      []Sets constant min/max shake values without calculations

      RPM Bounce Fix

      RPM bounce is caused by a static Vacuum Throttle value.

      When the carburetor is idling, it operates in State 1 and uses a small calculated idle value (around 0. 0013), which keeps the RPM at roughly 700. Because the ai