Solved

Max parts stored

Is it possible to store more than the max amount of parts the hq can store which in my case is 800? And will that affect the hq? 

It is, by having it at full then recieving a daily reward part, and it will not behave any differently to when you start the game with 50 for a 40 capacity building (e.g no change)

Yeah, thanks I manage to reach 820 parts and I was wondering if it was a bug or not not it maxes out in 800 after each race