In this article, we tune the 1986 Honda Civic SI in Forza Horizon 6 for street racing and touge roads. Find this car upgrade and tune down below.
This CIVIC SI features a 91hp FWD and D253 PI, our goal is to upgrade it up to D400 by improving speed, and easier to handle.
Honda Civic SI Upgrade List
+Engine:
- Intake: Race
- Intake Manifold: Race
- Exhaust: Race
- Oil Cooling: Race
- Flywheel: Race
+Platform and Handling:
- Brakes: Race
- Springs and Dampers: Race
- Weight Reduction: Race
+Drivetrain:
- Clutch: Race
- Driveline: Race
- Differential: Race
Honda Civic SI Tune List
+Tire Pressure
- Front: 28.0 PSI
- Rear: 28.0 PSI
Setting your tire pressure to 28.0 PSI keeps your tires flat on the road, giving you consistent grip and preventing sliding on the street.
+Alignment
Camber
- Front: Negative -1.8
- Rear: Negative -1.0
Toe
- Front: 0.1
- Rear: 0.0
- Front Caster: 6.5
Adding extra front negative camber and a tiny bit of front toe-out helps this front-wheel-drive (FWD) car turn into tight corners much quicker.
+Springs
- Front: 180.0 LB/IN
- Rear: 220.0 LB/IN
Using stiffer rear springs helps the back of the car rotate, reducing the heavy understeer (where the car wants to plow straight) that is common with FWD cars.
Ride Height
- Front: 165.6 IN
- Rear: 165.6 IN
Slamming the ride height to the absolute minimum lowers your center of gravity, directly increasing your cornering grip.
+Damping
Rebound Stiffness
- Front: 11.0
- Rear: 8.5
Bump Stiffness
- Front: 4.5
- Rear: 3.5
Stiff front bump stiffness stops the nose from dipping too hard under braking, keeping the car stable as you transition into a corner.
+Brake
- Balance: 50%
- Pressure: 100%
A balanced 50% brake bias gives you predictable, straight-line stopping power.
+Differential
- Acceleration: 55%
- Deceleration: 0%
Setting acceleration to 55% pulls the front of the car out of corners when you hit the gas, while 0% deceleration lets the car turn freely the moment you let off the throttle.
Honda Civic SI Tune Code
If you like our tune and want our exact build, put this code in: Tune Browser > Search > Share Code > and input our share code.
Here is the stats before vs after applying our upgrade and tune:
- Weight: 1,955 lb > 1598 lb
- Peak Power: 91 hp > 128 hp
- PWR: 0.05 hp/lb > 0.08 hp/lb
- Lateral Gs: 1.1 > 1.1
- Performance Class: D253 > D400.
Overall, our build makes the Civic faster at straight while keeping the good handle at bends or corners without losing much speed.
End of Guide
