[xSkullx]

pawn Код:

if(PRESSED(KEY_FIRE))
    {
        new Float:speed[4];
        GetVehicleZAngle(GetPlayerVehicleID(playerid), speed[3]);
        GetVehicleVelocity(GetPlayerVehicleID(playerid), speed[0], speed[1], speed[2]);
        SetVehicleVelocity(GetPlayerVehicleID(playerid),((floatadd(speed[0],floatmul(1.01,floatsin(-speed[3],degrees))))*2)/3, ((floatadd(speed[1],floatmul(1.01,floatcos(-speed[3],degrees))))*2)/3, speed[2]);
    }

Try this. If it gives errors post it here, i maked it quick !