Ummm, I think I'm getting what you mean, but it doesn't make perfect sense.
Guitar --> Wah Pedal --> Amp
There is an effects loop on my amp, and I've tried it through there but it sounds even worse.
The wah works, and it sounds reasonably ok, but it sounds weak and lacks a grundge.
I've had it for a while now, maybe it's not working the same, dunno.