[Konstantinos]

https://sampwiki.blast.hk/wiki/SetVehicleVelocity

An example of using speedboost while pressing the left mouse button:

pawn Код:

public OnPlayerKeyStateChange( playerid, newkeys, oldkeys )
{
    if( ( newkeys & KEY_FIRE ) && !( oldkeys & KEY_FIRE ) )
    {
        if( GetPlayerState( playerid ) == PLAYER_STATE_DRIVER )
        {
            new
                Float: vx,
                Float: vy,
                Float: vz
            ;
            GetVehicleVelocity( GetPlayerVehicleID( playerid ), vx, vy, vz );
            SetVehicleVelocity( GetPlayerVehicleID( playerid ), vx * 1.2, vy * 1.2, vz * 1.2 );
        }
    }
    return 1;
}