Found that cars are not responding the same way to parts changing.
The best lap times have been achieved with the DEX 410 21.41 for “Jey Full GaZ” and 21,45 for Diesel. DEX Tresrey reach 21,56 respectively and 21,50. It is interesting to see that the average of all times for each of them and see : the best lap are faster to 1/100 for DEX 410 that average lap is quicker to 1/100 for DEX Tresrey that dispersal of the lap times is lesser of 55 1/10th for DEX Tresrey and 47 1/10th for DEX 410.
Conclusion:
If you like to prepare your car, DEX 410 allows you to reach high performance.
Purchase parts Tresrey allows you to limit the time of preparation to get the same result in two hours of building.
Aluminum parts is a significant reliability improvement during races. Aluminum driveshafts are better to avoid having too much mass height, specially using the carbon chassis.