I was running a "3racing" fan 30x30mm, with timing turned up + the 3 racing fan my car was reaching about 155- 160degrees in temps.

I switched to a yeah racing fan 30x30mm, with timing the same my motor temps were about 140.

The 3Racing fan was about $5, the yeah racing one was $10. -a tad more $$ but it really pushes a lot more air.
Here is the fan I am currently using:
http://www.tqrcracing.com/shop/produ....asp?p_id=2335

BUT now I am convinced that certain fans are better than others, AND will be exploring other options as well to see if there is a better one that can get my motors even cooler. I also run a sedan class and that motor could really use a stronger fan as it is running a tad hotter than I'd like.