Help to edit handlings?

Good evening, my friends, I’m using google translator to get a little confused, but thanks in advance for helping.

I need help on the controls issue, I think I can change the top speed / acceleration, but when I change a line, it looks like it’s a drug in another, I wonder if there’s anyone there who understands and can explain me in such a simple way way. … type “when changing the acceleration has to change the gear too” that kind of thing I would like to know …

I hope someone has a complete tutorial but easy to understand! thank you

hello? :frowning: