diff --git a/koptilnya/engine/clutch.txt b/koptilnya/engine/clutch.txt
index b46df16..5ff835b 100644
--- a/koptilnya/engine/clutch.txt
+++ b/koptilnya/engine/clutch.txt
@@ -1,16 +1,39 @@
 Clutch = class("Clutch")
 
 function Clutch:initialize(options)
-  options = options or {}
+    options = options or {}
 
-  self.stiffness = options.Stiffness or 0
-  self.capacity = options.Capacity or 0
-  self.damping = options.Damping or 0
+    self.stiffness = options.Stiffness or 0
+    self.capacity = options.Capacity or 0
+    self.damping = options.Damping or 0
+    self.maxTorque = options.MaxTorque or 0
 
-  self._engine = options.Engine
-  self._gearbox = options.Gearbox
+    self.press = 1
+    self.slip = 0
+    self.targetTorque = 0
+    self.torque = 0
+
+    self._engine = nil
+    self._gearbox = nil
 end
 
 function Clutch:update()
-  
-end
\ No newline at end of file
+    local someConversionCoeff = 0.10472
+
+    local engRPM = self._engine and self._engine.rpm or 0
+    local gboxRPM = self._gearbox and self._gearbox.rpm or 0
+    local gboxRatio = self._gearbox and self._gearbox.ratio or 0
+    local gboxRatioNotZero = gboxRatio ~= 0 and 1 or 0
+
+    self.slip = (engRPM * someConversionCoeff - gboxRPM * someConversionCoeff) * gboxRatioNotZero / 2
+    self.targetTorque = math.clamp(self.slip * self.stiffness * (1 - self.press), -self.maxTorque, self.maxTorque)
+    self.torque = math.lerp(self.torque, self.targetTorque, self.damping)
+end
+
+function Clutch:linkEngine(engine)
+    self._engine = engine
+end
+
+function Clutch:linkGearbox(gbox)
+    self._gearbox = gbox
+end
diff --git a/koptilnya/engine/engine.txt b/koptilnya/engine/engine.txt
index 91f453b..1bd20cb 100644
--- a/koptilnya/engine/engine.txt
+++ b/koptilnya/engine/engine.txt
@@ -1,20 +1,73 @@
+-- @include ../libs/constants.txt
+require("../libs/constants.txt")
+
 Engine = class("Engine")
 
 function Engine:initialize(options)
-  options = options or {}
+    options = options or {}
 
-  self.idleRPM = options.IdleRPM or 800
-  self.maxRPM = options.MaxRPM or 8000
+    self.idleRPM = options.IdleRPM or 800
+    self.maxRPM = options.MaxRPM or 8000
 
-  self.flywheelMass = options.FlywheelMass or 4
-  self.flywheelRadius = options.FlywheelRadius or 0.3
+    self.flywheelMass = options.FlywheelMass or 4
+    self.flywheelRadius = options.FlywheelRadius or 0.3
 
-  self.startFriction = options.StartFriction or -30
-  self.frictionCoeff = options.FrictionCoeff or 0.02
+    self.startFriction = options.StartFriction or -30
+    self.frictionCoeff = options.FrictionCoeff or 0.02
 
-  self.limiterDuration = options.LimiterDuration or 0.05
+    self.limiterDuration = options.LimiterDuration or 0.05
 
-  self.torqueMap = options.TorqueMap or {}
+    self.torqueMap = options.TorqueMap or {}
 
-  self.throttle = 0
-end
\ No newline at end of file
+    self.throttle = 0
+
+    self.torque = 0
+    self.rpmFrac = 0
+    self.rpm = self.idleRPM
+    self.friction = 0
+
+    self._fwInertia = self.flywheelMass * self.flywheelRadius ^ 2 / 2
+    self._limiterTime = 0
+
+    self._clutch = nil
+end
+
+function Engine:setThrottle(throttle)
+    self.throttle = throttle
+end
+
+function Engine:linkClutch(clutch)
+    self._clutch = clutch
+    clutch:linkEngine(self)
+end
+
+function Engine:update()
+    self.rpmFrac = math.clamp((self.rpm - self.idleRPM) / (self.maxRPM - self.idleRPM), 0, 1)
+    self.friction = self.startFriction - self.rpm * self.frictionCoeff
+
+    local tqIdx = math.clamp(math.floor(self.rpmFrac * #self.torqueMap), 1, #self.torqueMap)
+    local maxInitialTorque = self.torqueMap[tqIdx] - self.friction
+
+    local idleFadeStart = math.clamp(math.remap(self.rpm, self.idleRPM - 300, self.idleRPM, 1, 0), 0, 1)
+    local idleFadeEnd = math.clamp(math.remap(self.rpm, self.idleRPM, self.idleRPM + 600, 1, 0), 0, 1)
+
+    local additionalEnergySupply = idleFadeEnd * (-self.friction / maxInitialTorque) + idleFadeStart
+
+    if self.rpm > self.maxRPM then
+        self.throttle = 0
+        self._limiterTime = os.time()
+    else
+        self.throttle = os.time() >= self._limiterTime + self.limiterDuration and self.throttle or 0
+    end
+
+    local masterThrottle = math.clamp(additionalEnergySupply + self.throttle, 0, 1)
+
+    local realInitialTorque = maxInitialTorque * masterThrottle
+
+    local loadTorque = self._clutch and self._clutch.torque or 0
+
+    self.torque = realInitialTorque + self.friction
+
+    self.rpm = self.rpm + (self.torque - loadTorque) / self._fwInertia * RAD_TO_RPM * TICK_INTERVAL
+    self.rpm = math.max(self.rpm, 0)
+end
diff --git a/koptilnya/engine/gearboxes/base.txt b/koptilnya/engine/gearboxes/base.txt
index 7a2d4ff..d517f85 100644
--- a/koptilnya/engine/gearboxes/base.txt
+++ b/koptilnya/engine/gearboxes/base.txt
@@ -1,18 +1,20 @@
 Gearbox = class("Gearbox")
 
 function Gearbox:initialize(options)
-  options = options or {}
+    options = options or {}
 
-  self.ratios = options.ratios
-  self.finalDrive = options.finalDrive
+    self.ratios = options.Ratios
+    self.finalDrive = options.FinalDrive
+    self.reverse = options.Reverse
 
-  self._linkedDiffs = {}
+    self.gear = 0
 
-  self.gear = 0
+    self._linkedDiffs = {}
+    self._clutch = nil
 end
 
 function Gearbox:linkDiff(diff)
-  table.insert(self._linkedDiffs, diff)
+    table.insert(self._linkedDiffs, diff)
 end
 
 function Gearbox:shift(dir)
@@ -20,9 +22,16 @@ function Gearbox:shift(dir)
 end
 
 function Gearbox:setGear(gear)
-  self.gear = gear
+    if gear >= -1 and gear <= #self.ratios then
+        self.gear = gear
+    end
+end
+
+function Gearbox:linkClutch(clutch)
+    self._clutch = clutch
+    clutch:linkGearbox(self)
 end
 
 function Gearbox:update()
-  
-end
\ No newline at end of file
+
+end
diff --git a/koptilnya/engine/gearboxes/cvt.txt b/koptilnya/engine/gearboxes/cvt.txt
index e370381..020d20b 100644
--- a/koptilnya/engine/gearboxes/cvt.txt
+++ b/koptilnya/engine/gearboxes/cvt.txt
@@ -1,4 +1,10 @@
 -- @include ./base.txt
 require("./base.txt")
 
-CVT = class("CVT")
\ No newline at end of file
+CVT = class("CVT")
+
+function CVT:initialize(options)
+    options = options or {}
+
+    self.base = Gearbox:new(options)
+end
diff --git a/koptilnya/engine/gearboxes/manual.txt b/koptilnya/engine/gearboxes/manual.txt
index 9257c4f..2f7da78 100644
--- a/koptilnya/engine/gearboxes/manual.txt
+++ b/koptilnya/engine/gearboxes/manual.txt
@@ -4,7 +4,14 @@ require("./base.txt")
 ManualGearbox = class("ManualGearbox")
 
 function ManualGearbox:initialize(options)
-  -- create base gearbox inside
+    options = options or {}
+
+    -- might want to segregate construction options for base gearbox 
+    self.base = Gearbox:new(options)
 end
 
--- proxy the methods here
\ No newline at end of file
+function ManualGearbox:linkClutch(clutch)
+    return self.base:linkClutch(clutch)
+end
+
+-- proxy the methods here
diff --git a/koptilnya/engine/main.txt b/koptilnya/engine/main.txt
index c3f0e1b..94685d9 100644
--- a/koptilnya/engine/main.txt
+++ b/koptilnya/engine/main.txt
@@ -1,9 +1,11 @@
 -- @name Koptilnya Engine
 -- @author Koptilnya1337
--- @shared
+-- @server
 --
 -- @include ./engine.txt
 --
+-- @include ./clutch.txt
+--
 -- @include ./gearboxes/manual.txt
 -- @include ./gearboxes/cvt.txt
 -- @include ./gearboxes/auto.txt
@@ -13,6 +15,8 @@
 -- @include ./configs/audi_tt.txt
 require("./engine.txt")
 --
+require("./clutch.txt")
+--
 require("./gearboxes/manual.txt")
 require("./gearboxes/cvt.txt")
 require("./gearboxes/auto.txt")
@@ -21,22 +25,54 @@ require("./differential.txt")
 --
 require("./configs/audi_tt.txt")
 
-if SERVER then
-    function adjustPorts()
-        wire.adjustPorts({
-            Input = "table"
-        }, {
-            RPM = "number"
-        })
-    end
+ECU = class("ECU")
 
-    function setupHooks()
+function ECU:initialize(options)
+    options = options or {}
 
-    end
+    self.engine = options.Engine
+    self.clutch = options.Clutch
+    self.gearbox = options.Gearbox
+    self.differentials = options.Differentials
+    self.input = {}
 
-    adjustPorts()
-    -- printTable(config)
-else
+    self:adjustPorts()
 
+    hook.add('tick', 'ecu_update', function()
+        self:update()
+    end)
 end
 
+function ECU:adjustPorts()
+    wire.adjustPorts({
+        Input = "table"
+    }, {
+        RPM = "number",
+        Torque = "number"
+    })
+end
+
+function ECU:update()
+    wire.ports.RPM = self.engine.rpm
+    wire.ports.Torque = self.engine.torque
+
+    self.input = wire.ports.Input
+
+    self.engine:setThrottle(self.input.Throttle.Value)
+    self.engine:update()
+end
+
+local clutch = Clutch:new(config.Clutch)
+
+local engine = Engine:new(config.Engine)
+engine:linkClutch(clutch)
+
+local gearbox = ManualGearbox:new(config.Gearbox)
+gearbox:linkClutch(clutch)
+
+local ecu = ECU:new({
+    Engine = engine,
+    Clutch = clutch
+    -- Gearbox = gearbox
+})
+-- printTable(config)
diff --git a/koptilnya/libs/constants.txt b/koptilnya/libs/constants.txt
index fee1b0f..b9e1c6f 100644
--- a/koptilnya/libs/constants.txt
+++ b/koptilnya/libs/constants.txt
@@ -1,3 +1,5 @@
 NULL_ENTITY = entity(0)
 CURRENT_PLAYER = player()
-OWNER = owner()
\ No newline at end of file
+OWNER = owner()
+TICK_INTERVAL = game.getTickInterval()
+RAD_TO_RPM = 9.5493
\ No newline at end of file