Response to @greaser9273: "The relationship is potentially infinite. If you went faster that the expansion you would reach the "edge"
"This is a truly mind-bending concept that made me think really hard, and I legitimate appreciate that. Remember that the expansion of the universe is not measured as a speed, but rather as a speed-per-unit-distance with no upper limit. So if you were to exceed the rate of expansion, you would be moving faster than the speed of light with greater-than-infinite mass. You would therefore no longer be moving forward through space, but rather you would be traveling backward through time, so you would be experiencing the expansion of the universe in reverse. From your perspective, the universe would appear to be contracting.
"This might initially appear to allow you potentially reach the edge, until you remember that, since you are no longer moving through space, your position within it is now fixed in relation to everything around you, so as the universe contracts, the space you occupy also contracts along with it. When you eventually slow down to subluminal speeds again, you will be no farther from or closer to the edge than you ever were when you exceeded the speed of light; you'll just be about a million years in the past as the universe goes back to expanding again at a rate you can never physically catch up to."