iRacing Okayama International Circuit – Full Course Track Guide
Okayama International Circuit Full Course is 3.703 km of classic Japanese road course: tight hairpins, flowing esses, and a mix of low and medium-speed corners that reward rhythm. Formerly TI Circuit Aida, it hosted Formula 1 in the 1990s and today is one of iRacing's staple learning tracks. Free content, but not easy—precision at the braking zones and exits defines lap time.
Track map
Overview
13 turns, 3.703 km. Key sections: the downhill braking into First Corner (T1); the slow Williams (T2) and Atwood (T3) hairpins; the long acceleration zone to the Hairpin (T4); the medium-speed Revolver (T5) and Piper (T7) right-handers; the technical Redman (T8) and Hobbs (T9) complex; and the critical Last Corner (T13) onto the start-finish straight. Main passing zones are First Corner, Hairpin, Redman, and sometimes Last Corner in lower series.
Why This Track Is Difficult
Track limits, elevation change, and mixed-speed corner sequences make this layout hard to execute consistently over a race run. Most time is lost through compromised exits that carry all the way down the next straight.
Best Car Classes for This Track
Mazda: Teaches momentum and clean exits. GT3: Strong all-round race option with clear braking references. LMP3/LMP2: Faster classes gain most in flowing sectors but require disciplined traffic decisions at braking zones.
Sector and Corner Guide
First Corner (Turn 1)
Type: Tight right at the end of the main straight. Gear: 2nd–3rd. Passing: Primary overtaking zone.
Braking: Heavy braking from top speed. Use a straight-line brake, then trail gently into the apex for rotation.
Line: Late apex. Turn in later than you think so you can straighten exit and get early throttle for the short burst to Williams.
Common mistake: Turning in early and running out of road on exit. That kills the run to T2 and risks off-tracks.
Williams (Turn 2)
Type: Tight left hairpin. Gear: 2nd. Passing: Possible with overlap from T1 exit.
Technique: Short braking zone but big rotation required. Trail brake deep, then pause mid-corner to let the car rotate.
Line: Hug the inside kerb and square off the exit. You want to be back to power early to link into Atwood.
Common mistake: Over-slowing. Williams rewards rolling speed and clean, early throttle rather than stop-and-go driving.
Atwood (Turn 3)
Type: Long right hairpin leading onto the back straight. Gear: 2nd–3rd. Passing: Rare; focus on exit.
Braking: Medium braking on entry, then sustained trail brake into the apex.
Line: Late apex with patience. Stay tight mid-corner, then open hands slowly and feed in throttle. Any slide or correction at exit costs huge speed down the straight.
Common mistake: Getting greedy on throttle mid-corner, forcing understeer and exit push. Prioritise exit over entry speed.
Hairpin (Turn 4)
Type: Heavy braking right at the end of the back straight. Gear: 2nd. Passing: One of the best overtaking spots.
Braking: Hard, straight-line braking with a clear marker. Trail just enough to rotate the nose.
Line: Classic late-apex hairpin. Stay a half-car off the inside at turn-in, roll to the apex, then unwind onto full throttle as early as the rear allows.
Common mistake: Lunging from too far back and overshooting the apex. That ruins both your lap and your rival's if you misjudge it.
Revolver (Turn 5)
Type: Medium-speed right. Gear: 3rd–4th. Passing: Rare; focus on flow.
Technique: Entry is slightly blind. Turn in with a small lift or short brake, then commit. Maintain a smooth arc and keep the car balanced.
Line: Aim for a late-mid apex and use all the exit kerb. This sets rhythm into the following section.
Common mistake: Over-slowing. Revolver rewards confidence and minimum steering angle.
Turns 6–7 (Mike Knight and Piper)
Type: Right-left sequence, then a key right (Piper). Gear: 3rd–4th. Passing: Mostly single-file; use to pressure.
Technique: Think of T6–7 as one rhythm. Light brake or lift to place the car, then float speed. Piper (the right) is the anchor corner—exit matters more than entry.
Line: Sacrifice a little T6 to maximise exit from Piper. Stay off the big kerbs if they unsettle your car.
Redman (Turn 8) and Hobbs (Turn 9)
Type: Technical right-left complex. Gear: 3rd. Passing: Possible into Redman with overlap.
Technique: Brake in a straight line for Redman, then trail slightly to tuck into the apex. Quick but controlled transition into Hobbs—do not shock the car over the kerbs.
Line: Prioritise balance through the change of direction. You want a clean platform for the short shoot to the final complex.
Common mistake: Attack the kerbs too aggressively and bounce the car, losing traction and stability.
Last Complex (Turns 10–13) and Last Corner
Type: Medium-speed right-left-right into the final right onto the straight. Gear: 2nd–3rd. Passing: Occasional dive at Last Corner.
Technique: Each corner here sets the next. Brake in a straight line where possible, rotate the car, and be patient with throttle until you can commit fully toward the line.
Line: Picture the sequence backwards: you need a clean exit from Last Corner more than a perfect entry into the complex. Carry speed onto the straight, even if it means giving up a tiny bit mid-complex.
Common mistake: Over-driving the first part of the complex and arriving at Last Corner with the car out of shape, forcing a slow exit.
Pit entry/exit
Pit entry: Typically from the right-hand side approaching Last Corner. Stay predictable, lift early, and commit to the pit lane speed limiter before the line. Check iRacing's pit entry cones and line for your series.
Pit exit: Rejoins on the inside of the main straight. Stay tight on the pit lane side of the blend line until it ends; only merge when clear. Cars on the racing line approach quickly from behind—use mirrors and relative.
Fuel usage
Okayama Full has two heavy braking zones and a lot of medium-speed corners. Fuel burn is moderate. Use your car's standard road fuel number as a baseline, then refine over a 10–15 lap run. If you need to save, short-shift in the Atwood-to-Hairpin straight and ease slightly earlier off throttle into First Corner and Hairpin rather than lifting mid-corner.
Tyre Management
The surface is relatively smooth, but the repeated braking and traction zones work the rear tyres, especially the driven axle. Front-right takes load through Revolver, Piper, and the final complex. Protect the tyres by avoiding wheelspin out of Hairpin and Last Corner, and by keeping steering inputs clean through the esses.
Overtaking and Defending
- First Corner (T1): Main overtaking point—draft, move late but clean, and brake in a straight line.
- Hairpin (T4): Long back straight feeds a heavy braking zone. Classic outbrake or switchback opportunity.
- Redman (T8): If you exit Piper better than the car ahead, you can send a move into the braking zone.
- Last Corner (T13): Lower split special—a late dive is possible, but only if you are fully alongside before turn-in.
Traffic Management Tips
Faster classes: Expect slower cars to brake earlier for First Corner, Hairpin, and Last Corner. The Atwood exit is sensitive—avoid forcing moves on the inside mid-hairpin where they cannot see you. Through Revolver and the final complex, commit early to a side and hold it. Slower classes: Be predictable into the big stops. Do not change line under braking. Use the straights between Atwood–Hairpin and Hairpin–Revolver to let faster classes go.
Setup Advice
Okayama rewards a neutral, compliant car that rotates on throttle without snapping. Too stiff and the car will skate over kerbs at Redman and Hobbs; too soft and it will roll excessively through Revolver and the esses. Brake bias: slightly rearward for rotation into Hairpin and Redman, but move forward if you lock rears into First Corner. Diff settings that allow early throttle at Atwood and Last Corner pay big dividends.
Alternative Layouts
iRacing may offer additional venue configurations for this circuit. Use this guide as the baseline for the primary/full road-course layout and re-check braking markers, overtaking windows, and off-track limits before running an alternate layout in officials or hosted sessions.
Common Mistakes to Avoid
Beginner: Braking too late and sacrificing exits. Intermediate: Over-defending and losing run quality. Fix: Build repeatable markers, prioritize exits, and keep the car stable over kerbs and transitions.
Racecraft and Incident Avoidance
Lap 1 incidents usually come from late, reactive moves into heavy braking zones. Leave margin in opening laps, finish overtakes before turn-in points, and back out when overlap is incomplete.
Qualifying vs Race Pace
Qualifying: Maximize one-lap commitment and kerb usage. Race: Trade small peak pace for legal exits, tyre consistency, and predictable traffic behaviour over stints.
Recommended gears
Typical GT3 reference (adjust for GT4, TCR, or slower cars):
| Section | Mazda | GT3 | LMP3 | LMP2 |
|---|---|---|---|---|
| First Corner (T1) | 2nd–3rd | 2nd–3rd | 2nd–3rd | 2nd–3rd |
| Williams (T2) | 2nd | 2nd | 2nd | 2nd |
| Atwood (T3) | 2nd–3rd | 2nd–3rd | 2nd–3rd | 2nd–3rd |
| Hairpin (T4) | 2nd | 2nd | 2nd | 2nd |
| Revolver (T5) | 3rd–4th | 3rd–4th | 3rd–4th | 3rd–4th |
| Mike Knight / Piper (T6–7) | 3rd–4th | 3rd–4th | 3rd–4th | 3rd–4th |
| Redman / Hobbs (T8–9) | 3rd | 3rd | 3rd | 3rd |
| Last Corner (T13) | 2nd–3rd | 2nd–3rd | 2nd–3rd | 2nd–3rd |
Final Tips
- Biggest time gain: Prioritize corner exits that feed long acceleration zones.
- Biggest race saver: Early, predictable decisions in traffic and braking phases.
- Hardest section: The highest-speed commitment sequence with limited margin.
- Best overtaking zone: The heaviest braking point after the longest straight.
Next: Sebring, Barber Motorsports Park, or Circuit de Spa-Francorchamps.