Money spent on upgrade in vain

wow thanks for this great info 7ru3blu3! I had no idea this is how it works... then I'll leave the Huracan alone and work on the Ferrari LaFerrari which is currently at 818 PR and it's still not enough to get past Off the Cuff race in chapter 15!

@mhorga All the parts works on the same way, green to blue, blue to purple, purple to gold, you lose some PR when you rebuilt them but you can recover them with 1-2 parts installed on it, some players complain about this but at the end if you full upgrade one part to purple (max) or gold (max) you always gain PR so is a real advanced do that, happy racing!!!

@peniastall I have only noticed this when converting from Blue to Purple (and may be Purple to Yellow). No other conversion resulted in loss of PR as far as I remember.

@7ru3blu3 That happened to me in only one car, lost  1-2 PR, don't remember exactly which car but I remembered was a hyper car, only rebuilt two parts because most of them upgrade obtaining purple parts, happy racing!!

Actually, you can see the parts PR drop in all cases, where the new part has fewer stars than the old one. That is always for blue to purple and purple to gold parts, and sometimes even from green to blue (classic sport and muscle cars).

And just for the record, there is always drop of PR of that part (when losing a star), but it may not transfer into cars PR status (usually for less important parts like Ecu/Nitro).