Do scientists know about how smart Allosauruses might have been compared to other animals? Also do we know how good their vision might of been and which sense they used most to locate prey?
Thank You

Not really, it's incredibly difficult to assess things like that from the fossil record.

However, you may find this article of interest, which compares brain endocasts of Allosaurus to other animals:

http://onlinelibrary.wiley.com/doi/10.1 … CO;2-W/pdf