The quickest GTP car at Red Bull Ring in iRacing 2026 Season 4 Week 4 is the Acura ARX-06 GTP, on a 1:19.284. The Aston Martin Valkyrie AMR-LMH is next, 0.190s 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 Red Bull Ring — Week 4
| # | Car | Fastest lap | Gap | |
|---|---|---|---|---|
| ✓ | 1 | Acura ARX-06 GTP | 1:19.284 1:19.284 opt | — |
| 2 | Aston Martin Valkyrie AMR-LMH | 1:19.474 1:19.462 opt | +0.190 | |
| 3 | Porsche 963 GTP | 1:19.494 1:19.433 opt | +0.210 | |
| 4 | Cadillac V-Series.R GTP | 1:19.530 1:19.518 opt | +0.246 | |
| 5 | BMW M Hybrid V8 (Evo) | 1:19.592 1:19.502 opt | +0.308 | |
| 6 | Ferrari 499P | 1:19.657 1:19.633 opt | +0.373 |
✓ 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
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The Acura ARX-06 GTP is the car to be in at Red Bull Ring 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 | 10 October 2026, 9:25am |
| Air temperature | 72°F |
| Humidity | 64% |
| Cloud cover | Mostly cloudy |
| Wind | 6 mph NE |
| 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.
