what are you using to d/l torrents,
azureus?
Here's what you need to do:
confirm the ip address your machine is assigned for wireless - start, run, cmd, ipconfig /all ..
check your torrent prog for the port it's using. change it if it's the standard 6889. change it to the 25K range
update your router's port forwarding to the ip you determined earlier.
understand that when you switch between wired and wireless, you will have to update your router, unless you're forwarding a range of ports.