So Rev hang is the new norm in order to reduce tailpipe emissions by ensuring combustion is complete in a controlled reduction in engine speed. It dulls the whole driving experience when paired with a manual trans (which is the only way to go) and often results in grinding 2nd gear due the the large ratio difference between 1st and an engine speed too fast for smooth synchromesh engagement.
It's a pain in the ass, but it's better for the environment so...yeah. We either live with it or we tune it out at the detriment to greater tailpipe emissions.
...but I had a couple of questions. Why is rev hang much worse on certain engines, and how on earth do quick-shifting automatics reduce engine speed so quickly and pass emissions? I'm not even talking about the farting autos out there (which I assume fart to burn off NOx); just the regular torque converters fitted to normal or higher performing engines. Many of these automatics shift gears in a small fraction of the time it takes from physically shifting from 1st to 2nd in a manual and yet we're grinding gears because of emissions. Is there a way to have an engine behave like it was bolted to an auto with its engine speed agility + emissions friendliness? There's something I'm not understanding here.