Big Jim
Hard-core CEG'er
Huh - I've got a Taurus PCM setup for a 3L with a top speed limited @ 200mph - just a rough tune to get it to run
Couldn't one find out the absolute top speed just be using the gear ratio's in the transmission? That is the absolute limiting factor - no HP. When you get tuned, they almost always "adjust" the top speed being it is as easy as editing a text box...
NO. The limitation is not gear ratio. It is POWER. Sometimes lowering the gear ratio will raise top speed.
As someone else mentioned, the additional power needed to even gain one more MPG is considerable. It is a logarithmic function. A 20% increase in power will not provide a 20% increase in speed.
Now if you were racing in a vacuum with no atmosphere to create interference that would be a different story.
My SWAG remains at 150 MPH. 160 MPH with forced induction. 200 MPH would take a HUGE increase in cylinder displacement as well.