Board Thread:Game Discussion/@comment-33340837-20180115030719/@comment-28622501-20180115124849

I have a rule of thumb: usually one upgrade is worth 0.2-0.3% in lap time. Of course there is some dependence on many factors such as speed or grip related upgrades fitting to the circuit type etc. But in my experience the rule has often proved to be quite useful.

As an estimate for this WTTT the 2 GC upgrades will give you an improval of some 0.5 sec. It is up to everybody to decide whether this is of an advantage in your situation.