Turbine Housing A/R Ratios Explained!

What is the "A/R" of the turbocharger hot side?
What does that mean & Why is it measured that way?
What type or size of A/R does a gasoline vehicle need?
Does it need to be larger to support the higher RPM exhaust flow?
Do Diesels need a smaller A/R for quickly spooling the turbo while towing?
Do Diesels need a larger A/R for high HP applications a racing?

If you have asked any of these questions, we are here to help clarify any confusion on the subject!

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