I was trying write in Bug Tab, but didn't work.
I was spying downforce, with a Downforce CD. In the end of race I receive point in acceleration.
My Acc is already at maximum.
Are you sure that you researched downforce? You could have inserted your CD in this race with downforce strength but you forgot to put flag to downforce.
I checked what you said, your acceleration is maximized thanks to suppliers.
If you check your acceleration in your car review, you notice that it is still not complete at all......so your research was in acceleration and not in dowforce.
Your acceleration (200 points) is not true; you reach 200 points thanks to your engine murk (+10 points). If you change your engine supplier, you notice that you have not 200 points.
Adding, if you go to research page and you flag acceleration, you notice that it's green, it means that your car hasn't max acceleration points. When it will be red, you reached the max points available and you have to move the research to another skill and click save button on the top right side......check it back after you do it.
Change your murk engine and notice that your car has not full points in acceleration without suppliers bonus.