researchers

At this moment I have 18 reseachers, still I don't see any advantage of having so many right now.
Engine today upgraded to 520 HP/80L max, aero to level 3, 10% / click/part.
With only a few researchers I would have obtained the same results. Am I missing something?
Regards, Yim

http://beta.f1m.fr/forum/?t=96

I'm redoing this part of the game and it'll be done in few days. atm they are not very important. Sorry about that.