The quickest GTP car at Road Atlanta in iRacing 2026 Season 4 Week 2 is the BMW M Hybrid V8 (Evo), on a 1:08.582. The Aston Martin Valkyrie AMR-LMH is next, 0.044s back.
Below is every one of the 6 cars in the class, ranked on the fastest lap our coaches set this week, with the optimal lap alongside it. All 6 ran the same conditions, so the differences are the cars, not the weather.
GTP lap times at Road Atlanta — Week 2
| # | Car | Fastest lap | Gap | |
|---|---|---|---|---|
| ✓ | 1 | BMW M Hybrid V8 (Evo) | 1:08.582 1:08.544 opt | — |
| ✓ | 2 | Aston Martin Valkyrie AMR-LMH | 1:08.626 1:08.573 opt | +0.044 |
| 3 | Porsche 963 GTP | 1:08.652 1:08.620 opt | +0.070 | |
| 4 | Ferrari 499P | 1:08.674 1:08.667 opt | +0.092 | |
| 5 | Cadillac V-Series.R GTP | 1:08.714 1:08.603 opt | +0.132 | |
| 6 | Acura ARX-06 GTP | 1:08.748 1:08.656 opt | +0.166 |
✓ marks a car within 0.05s of the fastest — close enough that the driver matters more than the machinery. opt is the optimal lap: that driver’s best sectors added together.
What the times tell you
This is a close one. BMW and Aston Martin are inside five hundredths of each other, which over a race distance is nothing at all. The driver matters more than the car here, so take whichever you are quickest and most comfortable in.
Worth noting: the Cadillac V-Series.R GTP is 5th on outright pace but 3rd on optimal lap. Its best sectors are quicker than its best lap suggests — there is time in it for a driver who can put a clean lap together.
Get the setup for the quickest car
The BMW M Hybrid V8 (Evo) is the car to be in at Road Atlanta this week.
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Conditions these times were set in
Lap times mean nothing without the conditions attached, so here are ours. Every car in this class ran the same session settings.
| Session start | 26 September 2026, 5:10pm |
| Air temperature | 79°F |
| Humidity | 60% |
| Cloud cover | Partly cloudy |
| Wind | 8 mph E |
| Track usage | 50% |
How we work these out
These are not simulated or estimated figures. Every lap time here was set by an Apex Racing Academy coach on the Apex setup for that car, in the same session conditions, and published as a VRS data pack. The fastest lap is the quickest complete lap driven. The optimal lap is that driver’s best sectors added together — what the car had in it on the day.
We publish this every week of the iRacing IMSA season, for every car in the class.
