I tested the FFB for the V8s and found that the castor angle dramatically changes how the FFB feels, particularly around the center when traveling in a straight line. The default castor angle of 15 degrees gives A nice stable FFB with a centering spring type of feel, you can take your hands off the wheel, and the car will travel straight. By lowering this to around 7 degrees, raising the Real Feel MaxForceAtSteeringRack to 100, and then adjusting the Real Feel mix to 80%, I got a much more lively road feeling. The bumps in the road are now much more noticeable, and I can more easily feel the front tire grip.
I also discovered that using the in-game Real Feel adjustments doesn't work. This seems to be because I have a Logitech wheel that requires negative values, and the in-game shortcut adjusts the value only in the positive range. Changing the Real Feel values in the RealFeelPlugin.ini file works and saves a lot of confusion. For example, a MaxForceAtSteeringRack value of 100 is very high, and 500 is a low force value.
Adding a mix value of 80% served two functions. Firstly adding a bit of traditional FFB effects added some vibrations, such as breaking and rumble strips which make the old RFactor tracks not feel so flat. Secondly, it was an excellent way to reduce the overall force value. It allowed me to run a high MaxForceAtSteeringRack and then trim it back with the Real Feel Mix adjustment.
Here are my RealFeelPlugin.ini settings.
[Craig Lowndes #888]
MaxForceAtSteeringRack=100.000000
SteeringDamper=11500.000000
FFBMixerRealFeelPercent=80.000000
FrontGripEffect=0.500000
SmoothingLevel=0
Kf=11500.000000
Ks=7.000000
A=1.500000
Kr=3.000000
And here are my Controller ini settings for the 20% Effect mix.
[ Force Feedback ]
FFB Device Type="1" // Type of FFB controller: 0=none 1=wheel, 2=stick/custom, 3=rumble pad.
FFB Effects Level="4" // Number of FFB effects to use: 0=No Effects, 1=Low, 2=Medium, 3=High, 4=Full, 5=Custom.
FFB Gain="1.00000" // Strength of Force Feedback effects. Range 0.0 to 1.0.
FFB Ignore Controllers="0" // Do not use FFB on: 1=controller1, 2=controller2, 4=controller3 (or add values to ignore multiple controllers)
FFB Throttle FX on steer axis="1" // 0 = Throttle effects on throttle axis, 1 = throttle effects on steering axis.
FFB Brake FX on steer axis="1" // 0 = Brake effects on brake axis, 1 = brake effects on steering axis.
FFB steer vibe freq mult="0.50000" // Controls frequency of steering vibration. Recommended: 0.5 to 1.0, 0.0 disables steering vibration.
FFB steer vibe zero magnitude="0.12000" // Magnitude of steering vibration at 0mph (reference point).
FFB steer vibe slope="0.00000" // Slope of line defining magnitude as a function of frequency (used with FFB steer vibe zero magnitude).
FFB steer vibe wave type="0" // Type of wave to use for vibe: 0=Sine, 1=Square, 2=Triangle, 3=Sawtooth up, 4=Sawtooth down.
FFB steer force prediction="0.00100" // Time into the future that force is predicted, to help counteract wheel latency (0.0 to disable)
FFB steer force max change="15.00000" // Maximum change per second based on current difference between calculated and applied force, to help avoid jerky behavior (values under 15 or so should reduce jerkiness, 100 disables)
FFB steer force neutral range="0.04500" // Max distance from center "neutral force" location where forces are reduced to help avoid oscillation (0.0 to disable)
FFB steer force neutral function="0.00000" // Function to apply near neutral force location, in order to tune out FFB "deadzone" but keeping oscillations in check: 0.0=original, 1.0=new
FFB steer force exponent="0.90000" // Steering force output "sensitivity". Range 0.0 to infinity. 0.0 to 1.0 = higher sensitivity, greater than 1.0 = lower sensitivity.
FFB steer force input max="-11500.00000" // Default 11500, increase to give more fidelity to the FFB
FFB steer force output max="2.00000" // Maximum force output of steering force, recommendation 0.8 to 2.0
FFB steer force grip function="0.55000" // Range 0.0 to 1.0 (previous hardcoded value was 1.0) - lower values will make steering force decrease LATER as front tire grip is lost - try 0.3
FFB steer force grip weight="0.80000" // Range 0.0 to 1.0, recommended: 0.4 to 0.9. How much weight is given to tire grip when calculating steering force.
FFB steer force grip factor="0.40000" // Range 0.0 to 1.0, recommended: 0.2 to 0.6 (previously hardcoded to 0.4). How much of a factor the front wheel grip is on the steering weight.
FFB steer front grip fract="0.00000" // Range 0.0 to 1.0 (previous hardcoded value was 0.0), additional effect of front grip loss on steering force
FFB steer update threshold="0.00000" // Amount of change required to update steer force/vibe (0.0 - 1.0). Lower values = steering force updated more frequently = lower frame rate.
FFB steer friction coefficient="0.10000" // Coefficient to use for steering friction. Range: -1.0 to 1.0
FFB steer friction saturation="1.00000" // Saturation value to use for steering friction. Range: 0 - 1.0
FFB steer damper coefficient="0.10000" // Coefficient to use for steering damper. Range: -1.0 to 1.0
FFB steer damper saturation="0.00000" // Saturation value to use for steering damper. Range: 0 - 1.0
FFB throttle vibe freq mult="0.10000" // Scales actual engine frequency to force FFB vibration frequency. Suggested range: 0.10 to 0.50
FFB throttle vibe zero magnitude="0.17500" // Magnitude of engine vibration at 0rpm (reference point).
FFB throttle vibe slope="0.00000" // Slope of line defining magnitude as a function of frequency (used with FFB throttle vibe zero magnitude).
FFB throttle vibe wave type="0" // Type of wave to use for vibe: 0=Sine, 1=Square, 2=Triangle, 3=Sawtooth up, 4=Sawtooth down.
FFB throttle vibe update thresh="0.02000" // Amount of change required to update throttle vibe (0.0 - 1.0)
FFB brake vibe freq mult="0.80000" // Scales actual brake rotational frequency to force feedback vibration frequency.
FFB brake vibe zero magnitude="0.13000" // Magnitude of brake vibration at 0mph (reference point).
FFB brake vibe slope="0.00000" // Slope of line defining magnitude as a function of frequency (used with FFB brake vibe zero magnitude).
FFB brake vibe wave type="0" // Type of wave to use for vibe: 0=Sine, 1=Square, 2=Triangle, 3=Sawtooth up, 4=Sawtooth down.
FFB brake vibe update thresh="0.02000" // Amount of change required to update brake vibe (0.0 to 1.0)
FFB rumble strip magnitude="0.35000" // How strong the rumble strip rumble is. Range 0.0 to 1.0, 0.0 disables effect.
FFB rumble strip freq mult="0.65000" // Rumble stip frequency multiplier 1.0 = one rumble per wheel rev.
FFB rumble strip wave type="0" // Type of wave to use for vibe: 0=Sine, 1=Square, 2=Triangle, 3=Sawtooth up, 4=Sawtooth down.
FFB rumble strip pull factor="-1.50000" // How strongly wheel pulls right/left when running over a rumble strip. Suggested range: -1.5 to 1.5.
FFB rumble strip update thresh="0.05000" // Amount of change required to update rumble strip effect (0.0 - 1.0)
FFB jolt magnitude="1.00000" // How strong jolts from other cars (or walls) are. Suggested Range: -2.0 to 2.0.