diff --git a/firmware/config/engines/custom_engine.cpp b/firmware/config/engines/custom_engine.cpp
index 992df49c7d..9da840416d 100644
--- a/firmware/config/engines/custom_engine.cpp
+++ b/firmware/config/engines/custom_engine.cpp
@@ -19,6 +19,11 @@
 #include "hellen_meta.h"
 #include "odometer.h"
 #include "defaults.h"
+#include "../board_id/qc_stim_meta.h"
+
+static_assert(libPROTEUS_STIM_QC == (int)engine_type_e::PROTEUS_STIM_QC);
+static_assert(libHELLEN_2CHAN_STIM_QC == (int)engine_type_e::HELLEN_2CHAN_STIM_QC);
+static_assert(libHELLEN_4CHAN_STIM_QC == (int)engine_type_e::HELLEN_4CHAN_STIM_QC);
 
 #if EFI_ELECTRONIC_THROTTLE_BODY
 #include "electronic_throttle.h"
@@ -975,6 +980,8 @@ void fuelBenchMode() {
     setBodyControlUnit();
 }
 
+// PROTEUS_STIM_QC
+// set engine_type 73
 void proteusStimQc() {
     engineConfiguration->trigger.type = trigger_type_e::TT_ONE_PLUS_ONE;
 
diff --git a/firmware/controllers/algo/engine_types.h b/firmware/controllers/algo/engine_types.h
index 6a103eaead..cef2e90a73 100644
--- a/firmware/controllers/algo/engine_types.h
+++ b/firmware/controllers/algo/engine_types.h
@@ -175,8 +175,8 @@ enum class engine_type_e : uint16_t {
 	HELLEN_121_VAG_4_CYL = 71,
 	HELLEN_121_NISSAN_6_CYL = 72,
 	PROTEUS_STIM_QC = 73,
-	UNUSED_74 = 74,
-	UNUSED_75 = 75,
+	HELLEN_4CHAN_STIM_QC = 74,
+	HELLEN_2CHAN_STIM_QC = 75,
 	HELLEN_154_VAG = 76,
 
 	HELLEN_121_VAG_5_CYL = 77,