This is an exclusive Supercars.com column by championship-winning Race Engineer Scott Sinclair. Sinclair will preview and debrief each round of the 2025 Repco Supercars Championship from his own perspective, and also shed light of his stories and analysis of the sport.

James Courtney clocks up 600 championship races this weekend, a massive number when you stop to think about the effort that goes into even a single race.

I engineered James’ car for four seasons from 2009 to 2012, a period covering nearly 100 of his 599 races to date. Two of those races were at Homebush on that memorable weekend that secured him the 2010 championship. I still get goosebumps just thinking about it.