I knew it was only a matter of time. You won't do so well here.

please, no one copy and paste that post into MS word, the spell check blew up my other computer.

That said, FM has a handy calculator for ya

Flyin' Miata : Technical info : Gearing calculator

if you get the quaife wide ratio and pair it with a 3.308 rear end and 225/50-15 tires, you'd be good up to 194mph. I wanna see someone do that in a miata. I think our highly aerodynamic bodies would start to lift off the ground at that point...

It would also take 600-700hp to get there.

I'm thinking turbocharged ls6

And I'm thinking you should base ratios on the T56 that comes with it ;)