Posted 29 November 2011 - 09:49 PM
Your network connection to the router has no effect on your Internet providers line speed...
You simply changed the speed you connect with your router (moving from 802.11G to 802.11N) Respectively, connection speeds of 54Mbps(G), 130-150Mbps(N).
Some quick math will tell you (at very best, but not reality) 150Mbps (Mega bits per second) is equal to 18.8Mb/ps (Mega bytes per second)
So the Fastest you could ever hope for would be 18MB Per second while connected via wireless (actually a top speed of 15MB might be the practical limit). If for some reason you have an internet connection that is rated for 20Mb (or more) Download speeds you can't even touch that while connected wirelessly. (The wired connection is the fastest - for now)
Also consider the destination site while downloading your file, do you feel they have a big fat +20MB pipe coming directly to your house? They may not have the capability to upload data that fast, so no matter what YOU do... it's only going to come as fast as it can... even if you have some massive Fiber line at 150MB+ it may only download at 1.5MB/sec.
Hope that helps...