The quickest GTP car at Fuji International Speedway in iRacing 2026 Season 4 Week 3 is the Porsche 963 GTP, on a 1:29.194. The Acura ARX-06 GTP is next, 0.049s 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 Fuji International Speedway — Week 3
| # | Car | Fastest lap | Gap | |
|---|---|---|---|---|
| ✓ | 1 | Porsche 963 GTP | 1:29.194 1:29.184 opt | — |
| ✓ | 2 | Acura ARX-06 GTP | 1:29.243 1:29.170 opt | +0.049 |
| 3 | Aston Martin Valkyrie AMR-LMH | 1:29.281 1:29.247 opt | +0.087 | |
| 4 | BMW M Hybrid V8 (Evo) | 1:29.367 1:29.273 opt | +0.173 | |
| 5 | Cadillac V-Series.R GTP | 1:29.423 1:29.269 opt | +0.229 | |
| 6 | Ferrari 499P | 1:29.432 1:29.333 opt | +0.238 |
✓ 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. Porsche and Acura 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 Porsche 963 GTP is the car to be in at Fuji International Speedway 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 | 3 October 2026, 7:25am |
| Air temperature | 71°F |
| Humidity | 63% |
| Cloud cover | Mostly cloudy |
| Wind | 2 mph N |
| 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.
