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The original was posted on /r/cars by /u/7h3C47 on 2025-05-29 23:10:47+00:00.

If you’re running a car (with a turbo) around an on-road circuit, I get that you’re not constantly switching between throttle and braking the way you are in rally. But you still have zones of long deceleration where you lose a lot of your proverbial steam. When you’re inevitably ready to get back on the gas, wouldn’t you ideally want that turbo to be all spooled-up already and delivering boost instantly as opposed to building it up organically again?

Totally appreciate that the likely answer to any question that starts with “Why don’t” or “Why isn’t” is because the negatives outweigh the positives. I guess I’m just wondering more specifically what those negatives are when it comes to racing disciplines outside of rally. And I don’t need to ask/ get into why it isn’t a common feature on production cars that drive civilian roads…mpg, maintenance, longevity, etc.

Tried doing some general searching and the only answer that felt significantly satisfactory is that turbo-lag is becoming less and less of a thing with overall/ other advancements in automotive engineering. Fair enough, if that’s the main reason.