The quickest GTP car at Road Atlanta for iRacing Petit Le Mans is the Ferrari 499P, on a 1:09.352. The Cadillac V-Series.R GTP is next, 0.018s back.
Below is every one of the 6 cars in the class, ranked on the fastest lap our coaches set for this event, 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
| # | Car | Fastest lap | Gap | |
|---|---|---|---|---|
| ✓ | 1 | Ferrari 499P | 1:09.352 1:09.340 opt | — |
| ✓ | 2 | Cadillac V-Series.R GTP | 1:09.370 1:09.331 opt | +0.018 |
| ✓ | 3 | BMW M Hybrid V8 (Evo) | 1:09.372 1:09.350 opt | +0.020 |
| 4 | Porsche 963 GTP | 1:09.473 1:09.392 opt | +0.121 | |
| 5 | Acura ARX-06 GTP | 1:09.478 1:09.404 opt | +0.126 | |
| 6 | Aston Martin Valkyrie AMR-LMH | 1:09.488 1:09.461 opt | +0.136 |
✓ 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. Ferrari and Cadillac and BMW 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.
Get the setup for the quickest car
The Ferrari 499P is the car to be in at Road Atlanta.
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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, 2:00pm |
| Air temperature | 78°F |
| Humidity | 62% |
| Cloud cover | Partly cloudy |
| Wind | 7 mph SE |
| Track usage | 100% |
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 one of these for every special event, and every week of the IMSA and GT Sprint seasons, for every car in the class.
