The sweep range of an inductor wah depends on how much gain the first transistor has. The emitter cap of the second transistor is multiplied by the gain of the first transistor. More gain, more capacitive multiplication, and more range. The wah pot can't possibly make the range wider - all it does is select points inside the maximums set by the gain. Using less of the pot sweep restricts you further, of course, but the more first stage gain, the wider the range.

There is a point of diminishing returns, of course. The frequency of the LC circuit varies as the square root of the product of L and C. So with a fixed inductor, the frequency range varies as the square root of the multiplied C. Doubling the gain makes the effective max C twice as big, but gives you only 1.414 times the frequency. Quadrupling the gain gives you only twice the frequency sweep range. And large gains can introduce other problems as well.

See "The Technology of Wah Pedals" at GEO.