I don't know mate. I was using the PAL version, which has just been released. They may well have tweaked it since then. Having said that I am using a chunky PS2, maybe if some other people come on we will find out for sure.
Seems strange that the pedals didnt come up at all in the calib screen, but its true that the MOMO does not work in *exactly* the same way as the GT Force so the pedals could be where they differ. I assume you've tried unplugging and re plugging in the pedals from the back of the wheel etc.
You could also try it in the Player 2 USB port? I dunno, I'm clutching at straws here.
This is a shame for you though because the MOMO is the perfect wheel for this game!
Mike