Isn't the IR remote simply a trigger? If so you will be limited to 30 Sec exposures. If you want to go longer you will need either a manual cable release for Bulb setting,
http://shop.centre.net.au/index.html...1DM&it=product
If you want automated in this style of product you will need to get the one for the 20D and an adapter.
It would be much cheaper to get the serial cable and operate from a laptop with DSLR Focus or similar