Car testing

if game:GetService("RunService"):IsClient() then error("Script must be server-side in order to work; use h/ and not hl/") end
local Player,game,owner = owner,game
local RealPlayer = Player
do
    print("FE Compatibility code by Mokiros")
    local rp = RealPlayer
    script.Parent = rp.Character

    --RemoteEvent for communicating
    local Event = Instance.new("RemoteEvent")
    Event.Name = "UserInput_Event"

    --Fake event to make stuff like Mouse.KeyDown work
    local function fakeEvent()
        local t = {_fakeEvent=true,Functions={},Connect=function(self,f)table.insert(self.Functions,f) end}
        t.connect = t.Connect
        return t
    end

    --Creating fake input objects with fake variables
    local m = {Target=nil,Hit=CFrame.new(),KeyUp=fakeEvent(),KeyDown=fakeEvent(),Button1Up=fakeEvent(),Button1Down=fakeEvent()}
    local UIS = {InputBegan=fakeEvent(),InputEnded=fakeEvent()}
    local CAS = {Actions={},BindAction=function(self,name,fun,touch,...)
        CAS.Actions[name] = fun and {Name=name,Function=fun,Keys={...}} or nil
    end}
    --Merged 2 functions into one by checking amount of arguments
    CAS.UnbindAction = CAS.BindAction

    --This function will trigger the events that have been :Connect()'ed
    local function te(self,ev,...)
        local t = m[ev]
        if t and t._fakeEvent then
            for _,f in pairs(t.Functions) do
                f(...)
            end
        end
    end
    m.TrigEvent = te
    UIS.TrigEvent = te

    Event.OnServerEvent:Connect(function(plr,io)
        if plr~=rp then return end
        m.Target = io.Target
        m.Hit = io.Hit
        if not io.isMouse then
            local b = io.UserInputState == Enum.UserInputState.Begin
            if io.UserInputType == Enum.UserInputType.MouseButton1 then
                return m:TrigEvent(b and "Button1Down" or "Button1Up")
            end
            for _,t in pairs(CAS.Actions) do
                for _,k in pairs(t.Keys) do
                    if k==io.KeyCode then
                        t.Function(t.Name,io.UserInputState,io)
                    end
                end
            end
            m:TrigEvent(b and "KeyDown" or "KeyUp",io.KeyCode.Name:lower())
            UIS:TrigEvent(b and "InputBegan" or "InputEnded",io,false)
        end
    end)
    Event.Parent = NLS([==[
    local Player = game:GetService("Players").LocalPlayer
    local Event = script:WaitForChild("UserInput_Event")

    local Mouse = Player:GetMouse()
    local UIS = game:GetService("UserInputService")
    local input = function(io,a)
        if a then return end
        --Since InputObject is a client-side instance, we create and pass table instead
        Event:FireServer({KeyCode=io.KeyCode,UserInputType=io.UserInputType,UserInputState=io.UserInputState,Hit=Mouse.Hit,Target=Mouse.Target})
    end
    UIS.InputBegan:Connect(input)
    UIS.InputEnded:Connect(input)

    local h,t
    --Give the server mouse data 30 times every second, but only if the values changed
    --If player is not moving their mouse, client won't fire events
    while wait(1/30) do
        if h~=Mouse.Hit or t~=Mouse.Target then
            h,t=Mouse.Hit,Mouse.Target
            Event:FireServer({isMouse=true,Target=t,Hit=h})
        end
    end]==],Player.Character)

    ----Sandboxed game object that allows the usage of client-side methods and services
    --Real game object
    local _rg = game

    --Metatable for fake service
    local fsmt = {
        __index = function(self,k)
            local s = rawget(self,"_RealService")
            if s then return s[k] end
        end,
        __newindex = function(self,k,v)
            local s = rawget(self,"_RealService")
            if s then s[k]=v end
        end,
        __call = function(self,...)
            local s = rawget(self,"_RealService")
            if s then return s(...) end
        end
    }
    local function FakeService(t,RealService)
        t._RealService = typeof(RealService)=="string" and _rg:GetService(RealService) or RealService
        return setmetatable(t,fsmt)
    end

    --Fake game object
    local g = {
        GetService = function(self,s)
            return self[s]
        end,
        Players = FakeService({
            LocalPlayer = FakeService({GetMouse=function(self)return m end},Player)
        },"Players"),
        UserInputService = FakeService(UIS,"UserInputService"),
        ContextActionService = FakeService(CAS,"ContextActionService"),
    }
    rawset(g.Players,"localPlayer",g.Players.LocalPlayer)
    g.service = g.GetService

    g.RunService = FakeService({
        RenderStepped = _rg:GetService("RunService").Heartbeat,
        BindToRenderStep = function(self,name,_,fun)
            self._btrs[name] = self.Heartbeat:Connect(fun)
        end,
        UnbindFromRenderStep = function(self,name)
            self._btrs[name]:Disconnect()
        end,
    },"RunService")

    setmetatable(g,{
        __index=function(self,s)
            return _rg:GetService(s) or typeof(_rg[s])=="function"
            and function(_,...)return _rg[s](_rg,...)end or _rg[s]
        end,
        __newindex = fsmt.__newindex,
        __call = fsmt.__call
    })
    --Changing owner to fake player object to support owner:GetMouse()
    game,owner = g,g.Players.LocalPlayer
end







--END





-- This works in FE, tested via Roblox Studio's "Test" tab.

local speed = 92
local equipped
local plr = game:GetService("Players").LocalPlayer
local plrchar = plr.Character or plr.CharacterAdded:Wait()

local tool = Instance.new("Tool", plr:WaitForChild("Backpack"))
tool.Name = "RaceCar"
local handle = Instance.new("Part", tool)
handle.Name = "Handle"
handle.CanCollide = true
handle.Anchored = false
local mesh = Instance.new("SpecialMesh", handle)
mesh.MeshId = "http://www.roblox.com/asset/?id=264666411"
mesh.TextureId = "http://www.roblox.com/asset/?id=264326115"
mesh.Scale = Vector3.new(3, 3, 3)

local gui = Instance.new("ScreenGui", plr:WaitForChild("PlayerGui"))
gui.Name = "RaceCarGUI"
local frame = Instance.new("Frame", gui)
frame.Size = UDim2.new(1, 0, .3, 0)
frame.Position = UDim2.new(0, 0, .7, 0)
frame.BackgroundTransparency = .5
frame.BackgroundColor3 = Color3.fromRGB(255, 255, 255)
frame.BorderSizePixel = 0
local SetSpeed_label = Instance.new("TextLabel", frame)
SetSpeed_label.Name = "SetSpeed_label"
SetSpeed_label.BorderSizePixel = 0
SetSpeed_label.Size = UDim2.new(1, 0, .25, 0)
SetSpeed_label.Font = Enum.Font.Arcade
SetSpeed_label.Text = "Set Speed"
SetSpeed_label.TextSize = 30
SetSpeed_label.BackgroundColor3 = Color3.fromRGB(255, 255, 255)
local SetSpeed = Instance.new("TextBox", frame)
SetSpeed.BackgroundTransparency = 1
SetSpeed.BorderSizePixel = 0
SetSpeed.Position = UDim2.new(0, 0, .25, 0)
SetSpeed.Size = UDim2.new(1, 0, .75, 0)
SetSpeed.Font = Enum.Font.SourceSansLight
SetSpeed.PlaceholderColor3 = Color3.fromRGB(48, 178, 96)
SetSpeed.PlaceholderText = "Speed in studs"
SetSpeed.Text = ""
SetSpeed.TextScaled = true

local prevSpeed = plrchar:WaitForChild("Humanoid").WalkSpeed
local prevJumpPower = plrchar:WaitForChild("Humanoid").JumpPower

tool.Equipped:Connect(function()
    prevSpeed = plrchar:WaitForChild("Humanoid").WalkSpeed
    prevJumpPower = plrchar:WaitForChild("Humanoid").JumpPower
    -- In case the player has set another speed
    plrchar:WaitForChild("Humanoid").WalkSpeed = speed
    plrchar:WaitForChild("Humanoid").JumpPower = 1
    equipped = true
end)

tool.Unequipped:Connect(function()
    plrchar:WaitForChild("Humanoid").WalkSpeed = prevSpeed
    plrchar:WaitForChild("Humanoid").JumpPower = prevJumpPower
    equipped = false
end)

function SignalError()
    SetSpeed_label.TextColor3 = Color3.fromRGB(232, 23, 23)
    wait(3)
    SetSpeed_label.TextColor3 = Color3.new(0, 0, 0)
end

function SignalSuccess()
    SetSpeed_label.TextColor3 = Color3.fromRGB(51, 204, 40)
    wait(3)
    SetSpeed_label.TextColor3 = Color3.new(0, 0, 0)
end

SetSpeed.FocusLost:Connect(function(enter)
    if enter == true then
        if tonumber(SetSpeed.Text) ~= nil then
            speed = tonumber(SetSpeed.Text)
            if equipped == true then
                plrchar:WaitForChild("Humanoid").WalkSpeed = speed
            end
            SignalSuccess()
            SetSpeed.Text = ""
        else
            SignalError()
            SetSpeed.Text = ""
        end
    else
        SetSpeed.Text = ""
    end
end)

plrchar:WaitForChild("Humanoid").Died:Connect(function()
    gui:Destroy()
    script:Destroy()
end)