Say go team in Chinese? Normally I would say 加油. On my city's news page this morning, they asked 10 people how to say "Go Syracuse (雪城)". There's a video of two men debating what to say, and then they say something like 雪城 __. I'm not sure what the other 2 words are. BiXue? 

Can anyone tell me what the characters are?

Is this something more popular in China? In Taiwan, I always used 加油. 

Here's the link (it's in the middle and right at the end):
http://www.syracuse.com/news/index.ssf/2014/03/what_does_lets_go_orange_sound_like_in_10_different_languages.html#incart_river_default
At Chinese mainland, we use 必胜 or 加油, they are both OK.

And, no, there are no phrase more popular than those two phrases, at least in my experience.