diff --git a/firmware/controllers/algo/defaults/default_base_engine.cpp b/firmware/controllers/algo/defaults/default_base_engine.cpp
index 2779e2a4b5..d562a266d0 100644
--- a/firmware/controllers/algo/defaults/default_base_engine.cpp
+++ b/firmware/controllers/algo/defaults/default_base_engine.cpp
@@ -21,6 +21,8 @@ void setDefaultBaseEngine() {
 
 	engineConfiguration->compressionRatio = 9;
 
+	engineConfiguration->turbochargerFilter = 0.01f;
+
 	engineConfiguration->fuelAlgorithm = LM_SPEED_DENSITY;
 	// let's have valid default while we still have the field
 	engineConfiguration->debugMode = DBG_INSTANT_RPM;
diff --git a/firmware/init/sensor/init_input_shaft_speed_sensor.cpp b/firmware/init/sensor/init_input_shaft_speed_sensor.cpp
index 07744b223e..8428586da9 100644
--- a/firmware/init/sensor/init_input_shaft_speed_sensor.cpp
+++ b/firmware/init/sensor/init_input_shaft_speed_sensor.cpp
@@ -1,5 +1,10 @@
 #include "pch.h"
 
+/**
+ * We were NOT able to get this code working reliable
+ * it could be that biquad parameter or biquad overall is part of the problem
+ */
+
 #include "init.h"
 #include "frequency_sensor.h"
 #include "input_shaft_speed_converter.h"
diff --git a/firmware/init/sensor/init_turbocharger_speed_sensor.cpp b/firmware/init/sensor/init_turbocharger_speed_sensor.cpp
index 347e1b096e..af9c718c6f 100644
--- a/firmware/init/sensor/init_turbocharger_speed_sensor.cpp
+++ b/firmware/init/sensor/init_turbocharger_speed_sensor.cpp
@@ -1,5 +1,9 @@
 #include "pch.h"
 
+/**
+ * See init_input_shaft_speed_sensor.cpp concerns - those might apply here as well!
+ */
+
 #include "init.h"
 #include "frequency_sensor.h"
 #include "turbocharger_speed_converter.h"
@@ -10,7 +14,7 @@ static TurbochargerSpeedConverter turbochargerSpeedConverter;
 
 void initTurbochargerSpeedSensor() {
 	// Filter parameter of 0.01 filters over roughly 100 teeth
-	turbochargerSpeedSensor.initIfValid(engineConfiguration->turboSpeedSensorInputPin, turbochargerSpeedConverter, 0.01f);
+	turbochargerSpeedSensor.initIfValid(engineConfiguration->turboSpeedSensorInputPin, turbochargerSpeedConverter, engineConfiguration->turbochargerFilter);
 }
 
 void deinitTurbochargerSpeedSensor() {
diff --git a/firmware/integration/rusefi_config.txt b/firmware/integration/rusefi_config.txt
index 86126519e6..e1b28b3b37 100644
--- a/firmware/integration/rusefi_config.txt
+++ b/firmware/integration/rusefi_config.txt
@@ -958,7 +958,7 @@ bit verboseCan2,"Print all","Do not print";Print incoming and outgoing second bu
     int launchFuelAdded;+Extra Fuel Added;"%", 1, 0, 0, 100, 0
     int launchBoostDuty;+Duty Cycle for the Boost Solenoid;"%", 1, 0, 0, 100, 0
 	int hardCutRpmRange;Range from Launch RPM to activate Hard Cut;"RPM", 1, 0, 0, 3000, 0
-	int unused962
+	float turbochargerFilter
 	int launchTpsThreshold;;"", 1, 0, 0, 20000, 0
 	float launchActivateDelay;;"", 1, 0, 0, 20000, 0
 
diff --git a/firmware/tunerstudio/rusefi.input b/firmware/tunerstudio/rusefi.input
index 194e6e5037..3016e7cce4 100644
--- a/firmware/tunerstudio/rusefi.input
+++ b/firmware/tunerstudio/rusefi.input
@@ -4029,6 +4029,7 @@ dialog = tcuControls, "Transmission Settings"
 		field = "Artificial Misfire",                   artificialTestMisfire
 		field = "Always use instant RPM",				alwaysInstantRpm
 		field = vinNumber,                              vinNumber
+		field = turbochargerFilter,                     turbochargerFilter
 		field = "TODO KS mode 4569",                    kickStartCranking
 		panel = allTriggerDebug
 		panel = torqueTableTbl