diff --git a/firmware/controllers/engine_controller.cpp b/firmware/controllers/engine_controller.cpp
index ac390ce8ef..862194b444 100644
--- a/firmware/controllers/engine_controller.cpp
+++ b/firmware/controllers/engine_controller.cpp
@@ -772,7 +772,7 @@ void initEngineContoller(DECLARE_ENGINE_PARAMETER_SUFFIX) {
  * UNUSED_SIZE constants.
  */
 #ifndef RAM_UNUSED_SIZE
-#define RAM_UNUSED_SIZE 8000
+#define RAM_UNUSED_SIZE 3500
 #endif
 #ifndef CCM_UNUSED_SIZE
 #define CCM_UNUSED_SIZE 600
diff --git a/firmware/controllers/lua/lua.cpp b/firmware/controllers/lua/lua.cpp
index f09cdc7d77..6407a63f17 100644
--- a/firmware/controllers/lua/lua.cpp
+++ b/firmware/controllers/lua/lua.cpp
@@ -16,7 +16,7 @@
 #define LUA_USER_HEAP 12000
 #endif
 #ifndef CCM_UNUSED_SIZE
-#define LUA_SYSTEM_HEAP 10000
+#define LUA_SYSTEM_HEAP 15000
 #endif
 
 static char luaUserHeap[LUA_USER_HEAP];
@@ -204,6 +204,33 @@ static bool loadScript(LuaHandle& ls, const char* scriptStr) {
 	return true;
 }
 
+static LuaHandle systemLua;
+
+const char* getSystemLuaScript();
+
+void initSystemLua() {
+	efiAssertVoid(OBD_PCM_Processor_Fault, !systemLua, "system lua already init");
+
+	Timer startTimer;
+	startTimer.reset();
+
+	systemLua = setupLuaState(myAlloc<1>);
+
+	efiAssertVoid(OBD_PCM_Processor_Fault, systemLua, "system lua init fail");
+
+	if (!loadScript(systemLua, getSystemLuaScript())) {
+		firmwareError(OBD_PCM_Processor_Fault, "system lua script load fail");
+		systemLua = nullptr;
+		return;
+	}
+
+	auto startTime = startTimer.getElapsedSeconds();
+
+#if !EFI_UNIT_TEST
+	efiPrintf("System Lua loaded in %.2f ms using %d bytes", startTime * 1'000, heaps[1].used());
+#endif
+}
+
 #if !EFI_UNIT_TEST
 static bool interactivePending = false;
 static char interactiveCmd[100];
@@ -312,6 +339,8 @@ static bool runOneLua(lua_Alloc alloc, const char* script) {
 }
 
 void LuaThread::ThreadTask() {
+	initSystemLua();
+
 	while (!chThdShouldTerminateX()) {
 		bool wasOk = runOneLua(myAlloc<0>, config->luaScript);
 
@@ -327,33 +356,9 @@ void LuaThread::ThreadTask() {
 
 static LuaThread luaThread;
 
-static LuaHandle systemLua;
-
-void initSystemLua() {
-	efiAssertVoid(OBD_PCM_Processor_Fault, !systemLua, "system lua already init");
-
-	Timer startTimer;
-	startTimer.reset();
-
-	systemLua = setupLuaState(myAlloc<1>);
-
-	efiAssertVoid(OBD_PCM_Processor_Fault, systemLua, "system lua init fail");
-
-	if (!loadScript(systemLua, "function x() end")) {
-		firmwareError(OBD_PCM_Processor_Fault, "system lua script load fail");
-		systemLua = nullptr;
-		return;
-	}
-
-	auto startTime = startTimer.getElapsedSeconds();
-	efiPrintf("System Lua loaded in %.2f ms using %d bytes", startTime * 1'000, heaps[1].used());
-}
-
 void startLua() {
 	luaThread.Start();
 
-	initSystemLua();
-
 	addConsoleActionS("lua", [](const char* str){
 		if (interactivePending) {
 			return;
@@ -382,7 +387,7 @@ void startLua() {
 #else // not EFI_UNIT_TEST
 
 void startLua() {
-	// todo
+	initSystemLua();
 }
 
 #include <stdexcept>
diff --git a/firmware/controllers/lua/lua.mk b/firmware/controllers/lua/lua.mk
index 6d9e79c32b..911a94f36d 100644
--- a/firmware/controllers/lua/lua.mk
+++ b/firmware/controllers/lua/lua.mk
@@ -3,6 +3,7 @@ LUA_EXT=$(PROJECT_DIR)/ext/lua
 
 ALLCPPSRC += $(LUA_DIR)/lua.cpp \
 			 $(LUA_DIR)/lua_hooks.cpp \
+			 $(LUA_DIR)/system_lua.cpp \
 
 ALLINC += $(LUA_DIR) $(LUA_DIR)/luaaa $(LUA_EXT)
 ALLCSRC += \
diff --git a/firmware/controllers/lua/system_lua.cpp b/firmware/controllers/lua/system_lua.cpp
new file mode 100644
index 0000000000..de7c18c0b7
--- /dev/null
+++ b/firmware/controllers/lua/system_lua.cpp
@@ -0,0 +1,19 @@
+const char* getSystemLuaScript() {
+	return R"LUASCRIPT(
+
+function getConfig(x)
+	return x
+end
+
+primeTimer = Timer.new()
+primeTimer:reset();
+
+function pumpLogic()
+	local prime = primeTimer:getElapsedSeconds() > getConfig(0)
+	local spinning = getTimeSinceTrigger() < 1
+
+	return prime or spinning
+end
+
+	)LUASCRIPT";
+}
\ No newline at end of file
diff --git a/unit_tests/tests/lua/test_lua_basic.cpp b/unit_tests/tests/lua/test_lua_basic.cpp
index 5b108ba9b0..c5cb9e0898 100644
--- a/unit_tests/tests/lua/test_lua_basic.cpp
+++ b/unit_tests/tests/lua/test_lua_basic.cpp
@@ -76,3 +76,7 @@ TEST(LuaBasic, ExpectNumOrNilReturnsNothing) {
 		end
 	)"), unexpected);
 }
+
+TEST(SystemLua, ScriptLoads) {
+	startLua();
+}