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The ratio multipler box of 1.5 or 2.0 would in IMO make a power steering box WAY too fast,

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I thought so too. But everyone that has driven that Hotchkis Emax Challenger loves it.

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I suspect the ratio is likely speed dependant, ie slow speeds a slow ratio, med speeds a fast ratio, and ala superspeedway/nascar speeds, they go back to a slow ratio to likely make more precise steering corrections and prevent oversteering, is my guess.

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No, those multipliers are just straight gear reduction boxes. Nothing fancy with variable ratios.

On a 1.5:1 multiplier the input makes 1 revolution the output make 1.5 revolutions. Ok, thinking this word problem though...

So 2.0 turns of the steering wheel then into a 1.5:1 reducer box yields 3.0 turns of the steering shaft into the steering box.

Stock 16:1 power steering cars are 3.6 turns lock to lock.

So .4 turns at the steering wheel into a 1.5:1 reducer box yields .6 turns of the steering shaft into the steering box....

So additively, using a 1.5:1 gear reducer in line with the steering shaft with a 16:1 power steering box will give you 2.4 turns lock to lock at the steering wheel and yeilds 3.6 turns into the steering box.

I think the T/A fast ratio is 2.7 turns lock to lock.

I think I answered my own question.