local C=_Tune.FinalDrive*_Tune.FDMult local F=_Tune.Horsepower/100 local l=_Tune.PeakRPM/1000 local B=_Tune.PeakSharpness local h=_Tune.CurveMult function FGC(C)C=C/1000 return(-(C-l)^2*math.min(F/l^2,h^(l/F))+F)*(C-C^B/(B*l)^(B-1))end local K=FGC(_Tune.PeakRPM)local y=workspace.Gravity/32.2 function GetCurve(F)local l=math.max((FGC(F)*_Tune.Horsepower)/K,0)local B=(car.DriveSeat.CFrame.lookVector.y*_Tune.InclineComp)*y if _CGear==-1 then B=-B end return l,((((l*(_Tune.EqPoint/F))*_Tune.Ratios[_CGear+2])*C)*math.max(1,1+B))*hpScaling end function Engine()if _CGear==0 then _ClutchOn=false end local F=_Tune.IdleRPM if not _IsOn then F=0 _CGear=0 _ClutchOn=false _GThrot=_Tune.IdleThrottle/100 end local l=0 for C,F in pairs(Drive)do if F.RotVelocity.Magnitude>l then l=F.RotVelocity.Magnitude end end if _ClutchOn then local B=math.max(math.min((((l*_Tune.Ratios[_CGear+2])*C)*30)/math.pi,_Tune.Redline+100),F)local h=math.min(math.abs(B-_RPM)/_Tune.ClutchTol,.9)_RPM=_RPM*h+B*(1-h)_HP,_OutTorque=GetCurve(_RPM)else if _GThrot-_Tune.IdleThrottle/100>0 then _RPM=math.min(_RPM+_Tune.RevAccel*_GThrot,_Tune.Redline+100)else _RPM=math.max(_RPM-_Tune.RevDecay,F)end _OutTorque=0 end local B=0 if _RPM>_Tune.Redline then if _CGear<#_Tune.Ratios-2 then _RPM=_RPM-_Tune.RevBounce B=0 else _RPM=_RPM-_Tune.RevBounce*.5 end else B=((_Tune.Redline+100)*math.pi)/((30*_Tune.Ratios[_CGear+2])*C)end if _TMode=="\065\117\116\111"and _IsOn then _ClutchOn=true if _CGear==0 then _CGear=1 end if _CGear>=1 then if _CGear==1 and(_GBrake>0 and car.DriveSeat.Velocity.Magnitude<20)then _CGear=-1 else if _Tune.AutoShiftMode=="\082\080\077"then if _RPM>_Tune.PeakRPM+_Tune.AutoUpThresh then _CGear=math.min(_CGear+1,#_Tune.Ratios-2)elseif math.max(math.min((((l*_Tune.Ratios[_CGear+1])*C)*30)/math.pi,_Tune.Redline+100),_Tune.IdleRPM)<_Tune.PeakRPM-_Tune.AutoDownThresh then _CGear=math.max(_CGear-1,1)end else if car.DriveSeat.Velocity.Magnitude>math.ceil(((((wDia*math.pi)*(_Tune.PeakRPM+_Tune.AutoUpThresh))/60)/_Tune.Ratios[_CGear+2])/C)then _CGear=math.min(_CGear+1,#_Tune.Ratios-2)elseif car.DriveSeat.Velocity.Magnitude<math.ceil(((((wDia*math.pi)*(_Tune.PeakRPM-_Tune.AutoDownThresh))/60)/_Tune.Ratios[_CGear+1])/C)then _CGear=math.max(_CGear-1,1)end end end else if _GThrot-_Tune.IdleThrottle/100>0 and car.DriveSeat.Velocity.Magnitude<20 then _CGear=1 end end end local h=0 local K=0 local y=0 local R=0 for C,F in pairs(car.Wheels:GetChildren())do if F.Name=="\070\076"or F.Name=="\070\082"or F.Name=="\070"then h=h+F.RotVelocity.Magnitude K=K+1 elseif F.Name=="\082\076"or F.Name=="\082\082"or F.Name=="\082"then y=y+F.RotVelocity.Magnitude R=R+1 end end h=h/K y=y/R local c=(h+y)/2 for C,F in pairs(car.Wheels:GetChildren())do local l=(CFrame.new(F.Position-(F.Arm.CFrame*CFrame.Angles(math.pi/2,-math.pi/2,0)).lookVector,F.Position)*CFrame.Angles(0,math.pi,0)).lookVector local K=1 local R=1 if F.Name=="\070\076"or F.Name=="\082\076"then K=-1 end if _Tune.Config=="\065\087\068"then _OutTorque=(_OutTorque*1.4142135623731)/2 end if F.Name=="\070\076"or F.Name=="\070\082"then R=math.max(0,math.min(1,1+(((F.RotVelocity.Magnitude-h)/h)/(math.max(_Tune.FDiffSlipThres,1)/100))*((_Tune.FDiffLockThres-50)/50)))if _Tune.Config=="\065\087\068"then R=math.max(0,math.min(1,R*(1+(((h-c)/c)/(math.max(_Tune.CDiffSlipThres,1)/100))*((_Tune.CDiffLockThres-50)/50))))end elseif F.Name=="\082\076"or F.Name=="\082\082"then R=math.max(0,math.min(1,1+(((F.RotVelocity.Magnitude-y)/y)/(math.max(_Tune.RDiffSlipThres,1)/100))*((_Tune.RDiffLockThres-50)/50)))if _Tune.Config=="\065\087\068"then R=math.max(0,math.min(1,R*(1+(((y-c)/c)/(math.max(_Tune.CDiffSlipThres,1)/100))*((_Tune.CDiffLockThres-50)/50))))end end _TCSActive=false _ABSActive=false if _PBrake and(_Tune.Config~="\070\087\068"and((F.Name=="\070\076"or F.Name=="\070\082")and car.DriveSeat.Velocity.Magnitude<20 or(F.Name=="\082\082"or F.Name=="\082\076")and car.DriveSeat.Velocity.Magnitude>=20)or _Tune.Config=="\070\087\068"and(F.Name=="\082\082"or F.Name=="\082\076"))then F["\035\065\086"].maxTorque=Vector3.new(math.abs(l.x),math.abs(l.y),math.abs(l.z))*PBrakeForce F["\035\065\086"].angularvelocity=Vector3.new()else if(_TMode=="\077\097\110\117\097\108"or _TMode=="\083\101\109\105")and _GBrake==0 or _TMode=="\065\117\116\111"and(_CGear>-1 and _GBrake==0 or _CGear==-1 and _GThrot-_Tune.IdleThrottle/100==0)then local C=false for l,B in pairs(Drive)do if B==F then C=true end end if C then local C=1 if not script.Parent.IsOn.Value then C=0 end local h=_GThrot if _TMode=="\065\117\116\111"and _CGear==-1 then h=_GBrake end local y=1 if _TCS then y=1-math.min(math.max(0,math.abs(F.RotVelocity.Magnitude*(F.Size.x/2)-F.Velocity.Magnitude)-_Tune.TCSThreshold)/_Tune.TCSGradient,1)*(1-_Tune.TCSLimit/100)end if y<1 then _TCSActive=true end local c=1 if _CGear==-1 then c=-1 end F["\035\065\086"].maxTorque=(((((Vector3.new(math.abs(l.x),math.abs(l.y),math.abs(l.z))*_OutTorque)*(1+(F.RotVelocity.Magnitude/60)^1.15))*h)*y)*R)*C F["\035\065\086"].angularvelocity=((l*K)*B)*c else F["\035\065\086"].maxTorque=Vector3.new()F["\035\065\086"].angularvelocity=Vector3.new()end else local C=_GBrake if _TMode=="\065\117\116\111"and _CGear==-1 then C=_GThrot end local B=1 if _ABS and math.abs(F.RotVelocity.Magnitude*(F.Size.x/2)-F.Velocity.Magnitude)-_Tune.ABSThreshold>0 then B=0 end if B<1 then _ABSActive=true end if F.Name=="\070\076"or F.Name=="\070\082"or F.Name=="\070"then F["\035\065\086"].maxTorque=((Vector3.new(math.abs(l.x),math.abs(l.y),math.abs(l.z))*FBrakeForce)*C)*B else F["\035\065\086"].maxTorque=((Vector3.new(math.abs(l.x),math.abs(l.y),math.abs(l.z))*RBrakeForce)*C)*B end F["\035\065\086"].angularvelocity=Vector3.new()end end end end


	local fFD = _Tune.FinalDrive*_Tune.FDMult

	--Horsepower Curve
	local fgc_h=_Tune.Horsepower/100
	local fgc_n=_Tune.PeakRPM/1000
	local fgc_a=_Tune.PeakSharpness
	local fgc_c=_Tune.CurveMult
	function FGC(x)
		x=x/1000
		return (((-(x-fgc_n)^2)*math.min(fgc_h/(fgc_n^2),fgc_c^(fgc_n/fgc_h)))+fgc_h)*(x-((x^fgc_a)/((fgc_a*fgc_n)^(fgc_a-1))))
	end
	local PeakFGC = FGC(_Tune.PeakRPM)
	
	--Plot Current Horsepower
	local cGrav = workspace.Gravity/32.2
	function GetCurve(x)
		local hp=math.max((FGC(x)*_Tune.Horsepower)/PeakFGC,0)
		local iComp =(car.DriveSeat.CFrame.lookVector.y)*_Tune.InclineComp*cGrav
		if _CGear==-1 then iComp=-iComp end
		return hp,hp*(_Tune.EqPoint/x)*_Tune.Ratios[_CGear+2]*fFD*math.max(1,(1+iComp))*hpScaling
	end
	
	--Powertrain
	function Engine()
		--Neutral Gear
		if _CGear==0 then _ClutchOn = false end
	
		--Car Is Off
		local revMin = _Tune.IdleRPM
		if not _IsOn then 
			revMin = 0 
			_CGear = 0
			_ClutchOn = false
			_GThrot = _Tune.IdleThrottle/100
		end
		
		--Determine RPM
		local maxSpin=0
		for i,v in pairs(Drive) do
			if v.RotVelocity.Magnitude>maxSpin then maxSpin = v.RotVelocity.Magnitude end
		end
		if _ClutchOn then
			local aRPM = math.max(math.min(maxSpin*_Tune.Ratios[_CGear+2]*fFD*30/math.pi,_Tune.Redline+100),revMin)
			local clutchP = math.min(math.abs(aRPM-_RPM)/_Tune.ClutchTol,.9)
			_RPM = _RPM*clutchP  +  aRPM*(1-clutchP)
			_HP,_OutTorque = GetCurve(_RPM)
		else
			if _GThrot-(_Tune.IdleThrottle/100)>0 then
				_RPM = math.min(_RPM+_Tune.RevAccel*_GThrot,_Tune.Redline+100)
			else
				_RPM = math.max(_RPM-_Tune.RevDecay,revMin)
			end
			_OutTorque = 0
		end
		
		--Rev Limiter
		local spLimit = 0
		if _RPM>_Tune.Redline then 
			if _CGear<#_Tune.Ratios-2 then
				_RPM = _RPM-_Tune.RevBounce
				spLimit = 0
			else
				_RPM = _RPM-_Tune.RevBounce*.5
			end
		else
			spLimit = (_Tune.Redline+100)*math.pi/(30*_Tune.Ratios[_CGear+2]*fFD)
		end
		
		--Automatic Transmission
		if _TMode == "Auto" and _IsOn then
			_ClutchOn = true
			if _CGear == 0 then _CGear = 1 end
			if _CGear >= 1 then
				if _CGear==1 and _GBrake > 0  and car.DriveSeat.Velocity.Magnitude < 20 then
					_CGear = -1
				else
					if _Tune.AutoShiftMode == "RPM" then
						if _RPM>(_Tune.PeakRPM+_Tune.AutoUpThresh) then
							_CGear=math.min(_CGear+1,#_Tune.Ratios-2) 
						elseif math.max(math.min(maxSpin*_Tune.Ratios[_CGear+1]*fFD*30/math.pi,_Tune.Redline+100),_Tune.IdleRPM)<(_Tune.PeakRPM-_Tune.AutoDownThresh) then
							_CGear=math.max(_CGear-1,1)
						end
					else
						if car.DriveSeat.Velocity.Magnitude > math.ceil(wDia*math.pi*(_Tune.PeakRPM+_Tune.AutoUpThresh)/60/_Tune.Ratios[_CGear+2]/fFD) then
							_CGear=math.min(_CGear+1,#_Tune.Ratios-2)
						elseif car.DriveSeat.Velocity.Magnitude < math.ceil(wDia*math.pi*(_Tune.PeakRPM-_Tune.AutoDownThresh)/60/_Tune.Ratios[_CGear+1]/fFD) then
							_CGear=math.max(_CGear-1,1)
						end
					end
				end
			else
				if _GThrot-(_Tune.IdleThrottle/100) > 0 and car.DriveSeat.Velocity.Magnitude < 20 then
					_CGear = 1
				end
			end
		end 
		
		--Average Rotational Speed Calculation
		local fwspeed=0
		local fwcount=0
		local rwspeed=0
		local rwcount=0
		
		for i,v in pairs(car.Wheels:GetChildren()) do
			if v.Name=="FL" or v.Name=="FR" or v.Name == "F" then
				fwspeed=fwspeed+v.RotVelocity.Magnitude
				fwcount=fwcount+1
			elseif v.Name=="RL" or v.Name=="RR" or v.Name == "R" then
				rwspeed=rwspeed+v.RotVelocity.Magnitude
				rwcount=rwcount+1
			end
		end
		fwspeed=fwspeed/fwcount
		rwspeed=rwspeed/rwcount	
		local cwspeed=(fwspeed+rwspeed)/2
		
		--Update Wheels
		for i,v in pairs(car.Wheels:GetChildren()) do
			--Reference Wheel Orientation
			local Ref=(CFrame.new(v.Position-((v.Arm.CFrame*CFrame.Angles(math.pi/2,-math.pi/2,0)).lookVector),v.Position)*CFrame.Angles(0,math.pi,0)).lookVector
			local aRef=1
			local diffMult=1
			if v.Name=="FL" or v.Name=="RL" then aRef=-1 end
			
			--AWD Torque Scaling
			if _Tune.Config == "AWD" then _OutTorque = _OutTorque*(2^.5)/2 end
			
			--Differential/Torque-Vectoring
			if v.Name=="FL" or v.Name=="FR" then
				diffMult=math.max(0,math.min(1,1+((((v.RotVelocity.Magnitude-fwspeed)/fwspeed)/(math.max(_Tune.FDiffSlipThres,1)/100))*((_Tune.FDiffLockThres-50)/50))))
				if _Tune.Config == "AWD" then
					diffMult=math.max(0,math.min(1,diffMult*(1+((((fwspeed-cwspeed)/cwspeed)/(math.max(_Tune.CDiffSlipThres,1)/100))*((_Tune.CDiffLockThres-50)/50)))))
				end
			elseif v.Name=="RL" or v.Name=="RR" then
				diffMult=math.max(0,math.min(1,1+((((v.RotVelocity.Magnitude-rwspeed)/rwspeed)/(math.max(_Tune.RDiffSlipThres,1)/100))*((_Tune.RDiffLockThres-50)/50))))
				if _Tune.Config == "AWD" then
					diffMult=math.max(0,math.min(1,diffMult*(1+((((rwspeed-cwspeed)/cwspeed)/(math.max(_Tune.CDiffSlipThres,1)/100))*((_Tune.CDiffLockThres-50)/50)))))
				end
			end
			
			_TCSActive = false
			_ABSActive = false
			--Output
			if _PBrake and ((_Tune.Config ~= "FWD" and (((v.Name=="FL" or v.Name=="FR") and car.DriveSeat.Velocity.Magnitude<20) or ((v.Name=="RR" or v.Name=="RL") and car.DriveSeat.Velocity.Magnitude>=20))) or (_Tune.Config == "FWD" and (v.Name=="RR" or v.Name=="RL"))) then
				--PBrake
				v["#AV"].maxTorque=Vector3.new(math.abs(Ref.x),math.abs(Ref.y),math.abs(Ref.z))*PBrakeForce
				v["#AV"].angularvelocity=Vector3.new()
			else
				--Apply Power
				if ((_TMode == "Manual" or _TMode == "Semi") and _GBrake==0) or (_TMode == "Auto" and ((_CGear>-1 and _GBrake==0 ) or (_CGear==-1 and _GThrot-(_Tune.IdleThrottle/100)==0 )))then
					local driven = false
					for _,a in pairs(Drive) do if a==v then driven = true end end
					if driven then
						local on=1
						if not script.Parent.IsOn.Value then on=0 end
						local throt = _GThrot
						if _TMode == "Auto" and _CGear==-1 then throt = _GBrake end
						
						--Apply TCS
						local tqTCS = 1
						if _TCS then
							tqTCS = 1-(math.min(math.max(0,math.abs(v.RotVelocity.Magnitude*(v.Size.x/2) - v.Velocity.Magnitude)-_Tune.TCSThreshold)/_Tune.TCSGradient,1)*(1-(_Tune.TCSLimit/100)))
						end
						if tqTCS < 1 then
							_TCSActive = true
						end
						
						--Update Forces
						local dir = 1
						if _CGear==-1 then dir = -1 end
						v["#AV"].maxTorque=Vector3.new(math.abs(Ref.x),math.abs(Ref.y),math.abs(Ref.z))*_OutTorque*(1+(v.RotVelocity.Magnitude/60)^1.15)*throt*tqTCS*diffMult*on
						v["#AV"].angularvelocity=Ref*aRef*spLimit*dir
					else
						v["#AV"].maxTorque=Vector3.new()
						v["#AV"].angularvelocity=Vector3.new()
					end
					
				--Brakes
				else
					local brake = _GBrake
					if _TMode == "Auto" and _CGear==-1 then brake = _GThrot end
					
					--Apply ABS
					local tqABS = 1
					if _ABS and math.abs(v.RotVelocity.Magnitude*(v.Size.x/2) - v.Velocity.Magnitude)-_Tune.ABSThreshold>0 then
						tqABS = 0
					end
					if tqABS < 1 then
						_ABSActive = true
					end
					
					--Update Forces
					if v.Name=="FL" or v.Name=="FR" or v.Name=="F" then
						v["#AV"].maxTorque=Vector3.new(math.abs(Ref.x),math.abs(Ref.y),math.abs(Ref.z))*FBrakeForce*brake*tqABS
					else
						v["#AV"].maxTorque=Vector3.new(math.abs(Ref.x),math.abs(Ref.y),math.abs(Ref.z))*RBrakeForce*brake*tqABS
					end
					v["#AV"].angularvelocity=Vector3.new()
				end
			end
		end
	end


