Read the data sheet for the film first: http://www.google.com/url?sa=t&sourc...mQUMMdmO-1HeEg
As I remember from the data sheet form EIR's predecessor, Kodak Ektachrome Infrared Film, they say that you need a #12 or similar filter to keep the pix from going terribly blue. They say that is MUST BE used with a #12 filter for scientific and other critical applications, and to use #8, #15, #22, or no filter at all for pictorial effects. This film with a #12 filter has EI 100 listed as a starting point in daylight in process E-4.
I imagine that EIR is pretty similar. Read the data sheet and you should find what you need to know.
If in doubt, I'd use a #12 filter at the recommended starting point, guess/bracket toward overexposure, and process it as a color negative.