Solved

No develop accelerated...

Hello! Since 2 races, the system has not develop accelerated. Why?

Because you aren't researching it :)

You are researching Braking!

But for fuel and tires I get 1-1 points for improvements. For the engine, it's 1 for cooling ... So far they've always been addicted to ...

I'm not sure what you mean.

That's what I meant. The acceleration has been 83 times for 3 days. Why?

https://igpmanager.com/app/d=design

As I said earlier, you aren't researching it.

Here is what you are researching:

Then again ... Look at acceleration 81 + 2 and cooling 52 + 1. I get the acceleration points from the fuel and the tire supplier. I get the cooling point from the engine supplier. These values do not increase from 4 races ... Why?

https://igpmanager.com/app/d=design

Hi, I'm very confused, I'm not sure if it me misunderstanding you, or if it is you misunderstanding me.

Either way, I'll try to provide an answer to what I think you are asking.

If you want to improve Acceleration, you have to enable research for it or give it design points after each race.
The same applies to all the others.

The supplier bonuses don't develop anything. They only provide a boost.

Supplier bonuses just provide a passive stat bonus; they do not accelerate the development of your car.

Well said Boomer, thanks. :)