You'd be surprised how cool it all runs. I was running my new 22-4 with a 6.5 all weekend without a fan and only seeing 4 led's once i dumped the pack. Considering there's NO airflow in the stock 22-4 body I'd say that's more than fine.

People that race with me often know I will not be pulled down the straight away

I always suggest running it without the fan for however long your mains are, full race pace. Pull it and check the led's showing temp. If you're 4 led's or lower, no fan required.