All-wheel-drive is the most misunderstood drivetrain in Forza Horizon 6. Half the community swears by it for everything; the other half treats it as a crutch. Both are wrong. AWD is a tool with very specific applications, and once you understand the tuning levers — center differential bias, front and rear locks, spring balance, and torque vectoring — you can build an AWD tune that destroys an equivalent RWD car on the right course, and accept that on the wrong course it will lose every time.
This guide breaks down when AWD wins, when RWD wins, and exactly how to tune the AWD-specific parameters in FH6 for rally, dirt, road and drift use cases.
When AWD beats RWD in FH6
AWD has three structural advantages. First, it puts the engine’s torque down across four contact patches instead of two, which matters most when each individual patch has limited grip. Second, it pulls the car forward through the front axle, which is harder to break loose than a rear axle being pushed. Third, it stabilises rotation under throttle, meaning you can get on the gas earlier without snap oversteer.
These three advantages compound on low-grip surfaces. Dirt, gravel, sand, snow and wet tarmac all favour AWD heavily. On a Rally-class build for the Baja-style stages in FH6, an AWD car will routinely beat an equivalent RWD car by 2 to 4 seconds per minute of stage. The grip just is not there for RWD to put down 600+ horsepower through two wheels.
AWD also wins on tight, technical road sections where corner-exit traction matters more than top-end speed. Hairpins, second-gear corners, technical chicanes — these are AWD’s home. If the corner-exit window is more than 60 percent of the lap, AWD usually wins.
When RWD beats AWD in FH6
The flip side. RWD wins anywhere the chassis can already put its power down without help. Long, flowing road circuits with sweepers and high average speeds favour RWD because:
- AWD systems add 100 to 200 lbs of weight, which hurts braking, change-of-direction and top speed.
- AWD differentials cost a small amount of efficiency in engine power transmission.
- AWD pulls the front of the car into the corner under throttle, which feels great but actually compromises rotation through long sweepers.
Highway/airport-style FH6 routes, S2 and X-class drag-heavy circuits, and most Hot Wheels-style elevated tracks are RWD territory. Do not bring an AWD tune to a 320 km/h average lap unless you have a very specific reason.
The four AWD tuning levers in FH6
Once you commit to AWD, four parameters shape the entire personality of the car. Get these right and the tune writes itself.
Lever 1 — Center differential bias (front/rear torque split)
This is the master switch. FH6 lets you set how much torque goes to the front versus the rear axle. The defaults vary by chassis but tend to sit around 30 percent front / 70 percent rear.
- 50/50 split — Maximum stability, dirt and gravel rally specialty. Feels like an Audi Quattro. Best for stages where you commit to a line and let the diff carry you.
- 30/70 to 40/60 — Road-biased AWD. Feels mostly like RWD but with a safety net. Best for technical road circuits where you want rotation but cannot afford snap oversteer.
- 20/80 — RWD-emulation. Use this when the chassis is fundamentally RWD-balanced and you only want AWD insurance for the worst corners.
- 80/20 or full front — Almost never useful in FH6. Generates plough understeer.
For a Rally-class car on a mixed-surface stage, 40/60 is a strong default. For a road A-class tune, 30/70 wins more often than not.
Lever 2 — Front differential lock (accel and decel)
The front diff in an AWD setup behaves a lot like a front diff in a FWD tune. Acceleration lock controls how much torque crosses between left and right front wheels under power; deceleration lock controls it under braking.
- Front accel lock 20–35 percent — Allows the front to rotate freely on corner entry. Good for road and tarmac.
- Front accel lock 50–70 percent — Locks the front under power, generates straight-line pull at the cost of corner exit rotation. Good for dirt and snow.
- Front decel lock 10–20 percent — Almost always low. A high front decel lock causes massive entry understeer on lift-off.
Lever 3 — Rear differential lock
The rear diff in AWD behaves identically to a RWD rear diff. Same rules: 30–50 percent accel lock for road, 60–80 percent for dirt, 10–25 percent decel lock as standard.
Lever 4 — Spring and damper balance front vs rear
AWD cars often need different spring rates than the RWD version of the same chassis because of weight distribution. The AWD drivetrain adds mass to the front axle (front differential, transfer case, prop shaft), so:
- Front springs typically 5–10 percent stiffer than the equivalent RWD tune
- Rear springs roughly the same as RWD
- Damping bias slightly stiffer at the front to control the extra mass
If you copy a RWD tune wholesale onto an AWD car, the front will feel under-sprung and roll excessively.
Discipline-specific AWD tune sheets
Use these as starting points, then refine.
Rally / Dirt (B to A class)
- Center diff: 50/50
- Front accel lock: 45 percent
- Rear accel lock: 55 percent
- Both decel locks: 15 percent
- Front camber: -0.5 to -1.0 (less than tarmac, you need contact patch on rough surfaces)
- Tyre pressure: 28 psi all round
- Ride height: max (you need travel)
Cross-country (Baja-style)
- Center diff: 50/50
- Front accel lock: 50 percent
- Rear accel lock: 60 percent
- Decel locks: 20 percent
- Ride height: max
- Springs: as soft as the chassis allows
- ARBs: as soft as the chassis allows
Road / Tarmac A and S1 class
- Center diff: 35/65 to 40/60
- Front accel lock: 25 percent
- Rear accel lock: 40 percent
- Decel locks: 15 percent
- Front camber: -2.5 to -3.0
- Rear camber: -1.5 to -2.0
- Tyre pressure: 30 psi front, 31 psi rear
Drift (yes, AWD drift)
- Center diff: 10/90 (almost full RWD)
- Front accel lock: 10 percent
- Rear accel lock: 100 percent
- This effectively makes the car drift as RWD but with the AWD chassis benefits
Common AWD tuning mistakes
- Setting 50/50 on tarmac — Cars feel locked in, refuse to rotate, scrub front tyres.
- Forgetting front diff exists — A locked front diff causes more understeer than any spring rate problem.
- Using RWD tyre pressures — AWD weight needs slightly higher pressures, especially up front.
- Ignoring brake balance — AWD cars need more rearward brake balance than equivalent RWD because the front is heavier.
How EasyTune handles AWD differently
When you tell EasyTune you are tuning an AWD car for a Rally event, the diagnostic flow changes. Instead of asking about RWD-specific symptoms like throttle-on oversteer, the symptoms tree branches into AWD-specific failures: “the car pulls itself wide under power”, “the front pushes through hairpins”, “the rear steps out on damp tarmac”. Each symptom maps to one of the four levers above. You verbalise the problem, get a targeted adjustment, validate it.
Tuning AWD well is mostly about resisting the urge to over-lock everything. Free diffs and balanced torque split do more than aggressive lock settings in most road conditions.
Closing thought
AWD is not a cheat code. It is a tool. The cars that win with AWD in FH6 are the ones tuned to AWD’s strengths — low-grip surfaces, technical corner exits, balanced torque deployment. The cars that lose with AWD are the ones tuned as if AWD made grip free.
Tune your car. Trust your feel.