iRacing’s Top 10 Most-Raced Series

10. iRacing Porsche Cup by CONSPIT

This single-car championship replicates real-world Porsche Cup competitions, including the Formula 1-supporting Porsche Supercup series, plus multiple national championships.

The Porsche 911 GT3 Cup is a tricky car, without ABS or traction control. However, in iRacing’s Season 1 2026 content update, the 992.2 edition of the car will witness the addition of these driving aids, dramatically changing the dynamic of this series - something where AI Coaching could be very useful.

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9. IMSA iRacing Series

One of the more complex series in this ranking - many popular combinations are single-class and short races - this is one of the many IMSA-affiliated competitions.

In this instance, races are 45-minute recreations of the longer, real-world IMSA events. So, there is multiclass racing, with GTP and GT3 machinery, but on a condensed scale. It adds in a hint of fantasy, with the schedule visiting tracks from around the globe, instead of being restricted to North America.

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8. Formula 1600 Rookie Series

There’s a strong likelihood that this is the series you first race in as a new iRacing subscriber.

It features the base content (i.e. included) Ray FF1600 single-seater and circuits that are also part of your membership.

The car is a bit more unpredictable than the Mazda MX-5 (see further near the top of this list), so it isn’t the most-raced series that uses bundled content, but seeing as it has ‘rookie’ in its title, this is where you’ll find many beginners.

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7. iRacing Porsche Cup Fixed by CONSPIT

‘Wait, isn’t this the same as number 10?’

Yes, it is, except here car setups are the same for everyone on the grid, whereas the less-popular version allows the driver to tweak settings. If you combine both, however, the Porsche Cup would be fourth overall.

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6. Sports Car Challenge by Falken Tyre

Multi-class racing, but unlike the aforementioned IMSA series, using much more palatable GT4 and LMP3 machines.
The races are also shorter, too, with 30-minute affairs that allow for close racing and a hint of traffic management.

An ideal starter series to begin your journey up the iRacing endurance racing ladder.

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5. GT4 Falken Tyre Challenge

Like number six, this also uses GT4 cars, but exclusively. While not as exciting as the more popular GT3 vehicles, in both iRacing and actual motorsport GT4 machines are seen as an ideal stepping stone.

Thinking of entering races in the number one and two slots on this list? Try this one first.

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4. Production Car Challenge by Sim-Lab

Much like the Formula 1600 Rookie Series, the Production Car Challenge uses base content.

However, it sets itself apart by using four different vehicles:

• Renault Clio
• BMW M2 CS Racing
• Toyota GR86
• Global Mazda MX-5 Cup

The Toyota and Mazda feature very similar characteristics, being light, rear-wheel drive, naturally aspirated sports cars. The BMW, however, is turbocharged, and when the torque kicks in, it can be difficult to control. The Renault, meanwhile, is front-wheel drive and requires a completely different driving technique.

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3. Global Mazda MX-5 Cup by Fanatec

Sim racing TikTok clips, Instagram Reels and YouTube Shorts just wouldn’t be the same without the Mazda MX-5 Cup on iRacing. Not only is the car included as base content, it only races on complimentary venues too within the introductory ‘Rookie’ series.

This roadster is also straightforward to drive - you can really lean into the brakes without fear of a lock, and when the rear slides, it does so progressively. Mercifully, if you do lose control, you won’t be going quickly, either, with the Mazda one of the platform’s slowest vehicles.

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2. GT Sprint Series by Simucube

GT3 racing is equally ubiquitous in sim racing and real-world motorsport; the sports car-based formula with driving aids and slick tyres provides approachable vehicles.

What’s notable here, however, is that unlike the MX-5 or the Formula 1600 series, no GT3 car is included within the iRacing subscription. Every single one is an extra fee. It just goes to show, especially following some physics changes earlier this year, that the racing in this category is so enjoyable that most people are willing to pay extra to take part.

The first two spots are taken by series that use these vehicles - the GT Sprint Series typically runs 40-minute long races.

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1. GT3 Challenge Fixed by Fanatec

Which is why the GT3 Challenge Fixed takes the top spot. It also used GT3 cars, but unlike the GT Sprint Series, its races are half the length at 20 minutes.

Which, admittedly, is slightly odd for a series with ‘sprint’ in its title to run longer races, but there’s a third GT3 championship that is ‘Endurance’, which has even longer events.

This series also prohibits car setup changes, so the shorter races, combined with less complexity, see this become the most raced-in series iRacing has.

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Written by the teams at trophi.ai and Traxion.GG.