How people tune their cars, V8s in particular, to have that deep, “galloping” sound and that slow, almost stalling idle? And what’s the purpose of doing that, other than to “make it sound” like so?

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Answer 1

It is a cam profile that only runs well at high RPM, but not very well at idle. It also makes more power at high revs at the expense of drivability. This is why variable valve timing was invented, which is a “best of both worlds” technology.