Watching an episode of Chasing Classic Cars - so they’re restoring a 1973 BMW 3.0 CSi for a customer. Trying to chase down a damp sunroof liner, they suspected one of the drainage outlets was blocked. So BMW with their crazy German engineering, the sunroof drains out the rear of the side BMW badging on the C-pillars!
Made me wonder what sort of other obscure engineering details that most of us have missed in cars?
Not all sequential turbocharger systems from the 80s and 90s worked the same way. For example the Porsche 959, Supra, and Rx-7 all used different types of valves to control the exhaust flow. Fitment and packaging were a big constraint. It’s likely that contributed to the finicky nature of the Rx-7s turbo system.
Highly researched article I wrote a long time ago with actual paper citations: https://www.rx7club.com/3rd-generation-specific-1993-2002-16/comparison-rx-7-13b-rew-supra-2jz-gte-sequential-turbos-960727/