I made some changes, now it is much easier to drive :)
File: drivetrain.ini
[GEARS]
COUNT=5 ; forward gears number
GEAR_R=-3.727 ; rear gear ratio
GEAR_1=3.647
GEAR_2=2.045
GEAR_3=1.367
GEAR_4=0.990
GEAR_5=0.820
[CLUTCH]
MAX_TORQUE=600
File: power.lut
0|610
500|610
1000|453
1500|500
2000|578
2500|600
3000|665
3500|740
4000|780