This is a gold maker. Curious to know if anybody can duplicate or has duplicated. 

1. Sign out of Game Center but stay online. 

2. Open rr3 and check back on series you've completed. 

If its like mine, you should see some of your series showing less than 100% complete. Mine have 1 or 2 tt's showing "new". If I race that time trial, I get the 3k r$ and 3 gc completion bonus, yet it doesn't take away he "new" status, so I can rerun it again. And again. And again. I've made over 100 gc today alone by running the same tt over and over again. With 2 pips, you can make 6 gc every 16-18 minutes or so. If you can do it, use one of the top tier series and short races. I'm using speed demons, agera at Dubai. Run it at 1:10 a pop, so 6 gc in about 2:30 then wait to reload. I've got another lower tier series doing the same thing, but its only 2 gc, so I eschew it. (Word of the day for last Sunday on my calendar, but I forgot to use it then.)

feel free to hit me up for any clarification. Good luck and happy mining. Hope it works for you guys.