Okay i have spent the day testing and the car has the same grip at 150mph or 240kph what it should approximately have but the car goes like on rails ie it does not drift at all when the downforce picks up.but it does so at lower speeds. i think this might be related to tires and the slip angle itself.
so peak downforce at max speed is around 17000n so at 315kph and 240kph it has 11000n or 2500 lb of downforce.
[FRONTWING]
FWForceDistrib=(1:Front_Subbody)
FWRange=(0, 1, 6) // front wing range
FWSetting=0 // front wing setting
FWMaxHeight=(0.33) // maximum height to take account of for downforce
FWDragParams=(0.023, 0.0068, 0.00002) // base drag and 1st and 2nd order with setting
FWLiftParams=(-0.0792, -0.0088, 1E-05) // base lift and 1st and 2nd order with setting
FWDraftLiftMult=1.4 // Half,1st,2nd order effects on lift with front wing height
FWLiftHeightPlus=(0.0,,0.0) // Half,1st,2nd order effects on lift with front wing height
FWLiftSideways=(0.047) // dropoff in downforce with yaw (0.0 = none, 1.0 = max)
FWLiftPeakYaw=(0, 1) // Angle of peak, multiplier at peak
FWLeft=(-0.02, 0, 0) // aero forces from moving left
FWRight=(0.02, 0, 0) // aero forces from moving right
FWUp=(0, -0.06, 0.006) // aero forces from moving up
FWDown=(0, 0.06, -0.003) // aero forces from moving down
FWAft=(0, 0.04, -0.04) // aero forces from moving rearwards
FWFore=(0, 0, 0) // aero forces from moving forwards (recomputed from settings)
FWRot=(0.1, 0.05, 0.15) // aero torque from rotating
FWCenter=(0, -0.18, -0.70) // center of front wing forces (offset from center of front axle in ref plane)
[REARWING]
RWForceDistrib=(1:Rear_Subbody)
RWRange=(11.0, 1.0, 10) // rear wing range
RWSetting=1 // rear wing setting
RWDragParams=(0.0585, 0.00688, 0.00002) // base drag and 1st and 2nd order with setting
RWLiftParams=(-0.1531, -0.01201, -0.000002) // base lift and 1st and 2nd order with setting
RWDraftLiftMult=0.2 // Effect of draft on rear wing's lift response
RWLiftSideways=(0.094) // Dropoff in downforce with yaw (0.0 = none, 1.0 = max)
RWLiftPeakYaw=(0.0, 1.0) // Angle of peak, multiplier at peak
RWLeft=(-0.05, 0.0, 0.0) // aero forces from moving left
RWRight=(0.05, 0.0, 0.0) // aero forces from moving right
RWUp=(0.0, -0.09, 0.03) // aero forces from moving up
RWDown=(0.0, 0.09 -0.02) // aero forces from moving down
RWAft=(0.0, 0.08, -0.08) // aero forces from moving rearwards
RWFore=(0.0, 0.0, 0.0) // aero forces from moving forwards (recomputed from settings)
RWRot=(0.10, 0.05, 0.15) // aero torque from rotating
RWCenter=(0, 0.50, 0.64) // center of rear wing forces (offset from center of rear axle at ref plane)
[BODYAERO]
BodyForceDistrib=(1:Front_Subbody)
BodyDragBase=(0.142) // base drag
BodyDragHeightAvg=(0.350) // drag increase with average ride height
BodyDragHeightDiff=(0.900) // drag increase with front/rear ride height difference
BodyMaxHeight=(0.40) // maximum ride height that affects drag/lift
DraftBalanceMult=2.00 // Effect of draft on aerodynamic downforce balance of car (bigger numbers exaggerate the effect)
BodyDraftLiftMult=0.2 // Effect of draft on body's lift response
RadiatorDraftFract=1.5 // effect of draft on the radiator cooling, 0.0 (no effect) to 1.0 (full effect)
BodyNegRakeDrag=(0,0,5) // if rake is negative, use absolute value of rake angle: (coeff*degrees, coeff*degrees^2, maxDegrees)
BodyPosRakeDrag=(0,0,5) // if rake is positive: (coeff*degrees, coeff*degrees^2, maxDegrees)
BodyNegRakeLift=(0,0,5) // if rake is negative, use absolute value of rake angle: (coeff*degrees, coeff*degrees^2, maxDegrees)
BodyPosRakeLift=(0,0,5) // if rake is positive: (coeff*degrees, coeff*degrees^2, maxDegrees)
BodyLeft=(-0.7, 0.0, 0.0) // aero forces from moving left
BodyRight=(0.7, 0.0, 0.0) // aero forces from moving right
BodyUp=(0.0, -1.7, 0.0) // aero forces from moving up
BodyDown=(0.0, 1.7, 0.0) // aero forces from moving down
BodyAft=(0.0, 0.10, -1.00) // aero forces from moving rearwards
BodyFore=(0.0, -0.2200, 0.370) // aero forces from moving forwards (lift value important, but drag overwritten)
BodyRot=(4.0, 3.0, 2.0) // aero torque from rotating
BodyCenter=(0.0, 0.290, -1.330) // center of body aero forces (offset from center of rear axle at ref plane)
RadiatorRange=(0.0, 1.0, 4) // radiator range (front grille tape)
RadiatorSetting=3 // radiator setting
RadiatorDrag=(0.0090) // effect of radiator setting on drag
RadiatorLift=(0.0100) // effect of radiator setting on lift
BrakeDuctRange=(0.0, 1.0, 5) // brake duct range
BrakeDuctSetting=2 // brake duct setting
BrakeDuctDrag=(0.014) // effect of brake duct setting on drag
BrakeDuctLift=(0.0110) // effect of brake duct setting on lift
BaseDropoffLeadFollow=(0.09,0.18) //BaseDropoffLeadFollow=(<lead>,<follow>)
LeadingExponent=5.70 // RFM Drafting override: Higher number -> lower effect on leader (default=2.0)
FollowingExponent=1.75 // RFM Drafting override: Higher number -> lower effect on followers (default=2.0)
VehicleWidth=2.00 // RFM Drafting override: Helps determine base width of wake (default=1.9)
SideEffect=0.35 // RFM Drafting override: Negative effects of side-by-side drafting (default=0.35)
[DIFFUSER]
DiffuserForceDistrib=(1:Front_Subbody)
DiffuserBasePlus=(-2.335,0, 2, 75) // (Base lift,<SquareRoot (New)>,<Linear (2nd)>,<Squared (3rd))
DiffuserFrontHeightPlus=(0,0.8,0,0.1) //(<SquareRoot (New)>,<Linear (Old)>,<Squared>,<Max Front Height>.)
DiffuserRake=(-0.02, -5, 150) // Optimum rake (rear - front ride height), 1st order with current difference from opt, 2nd order
DiffuserLimits=(0.03, 0.1, 0.075) // Min ride height before stalling begins (0.0=disabled), max rear ride height for computations, max rake difference for computations
DiffuserStall=(0.1, 1.0) // Function to compute stall ride height (0.0=minimum, 1.0=average), downforce lost when bottoming out (0.0=none, 1.0=complete stall)
DiffuserDraftLiftMult=1.0 // Effect of draft on diffuser's lift response
DiffuserSideways=(0.094) // Dropoff with yaw (0.0 = none, 1.0 = max)
DiffuserPeakYaw=(0, 1) // Angle of peak, multiplier at peak
DiffuserCenter=(0, -0.142, -1.166) // Center of diffuser forces (offset from center of rear axle at ref plane)
So im wondering how i could keep the existing grip but allow the cars to slip slightly so you could 4 wheel drift them at speed. instead of them going straight on rails when the downforce picks up at speed with the diffuser. the car gains massive downforce once it goes around 100-150kph and exceeds that and at full speed it practically goes on rails due the downforce it has and the completely stiff suspension it has as suspension has 650-950nm as stiffness, around 800-860nm at stock.