The iRacing European Sprint Series (ESS) is more or less a 60-minute version of the FIA World Endurance Championship that's aimed at giving you all of the excitement and challenges of endurance racing in a shorter format that's more appealing to the majority of sim racers.
The IMSA iRacing Series (IMSA) is essentially a 45-minutes version of the real-world IMSA Sportscar Championship. The IMSA iRacing Series is very similar to the iRacing European Sprint Series, with a few key differences that we'll highlight in this article.
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