diff --git a/board.mk b/board.mk
index d92fb6b..efcf977 100644
--- a/board.mk
+++ b/board.mk
@@ -1,4 +1,6 @@
-BOARDCPPSRC =  $(BOARD_DIR)/board_configuration.cpp
+BOARDCPPSRC =  $(BOARD_DIR)/board_configuration.cpp \
+    $(BOARD_DIR)/default_tune.cpp \
+
 
 BOARDINC += $(BOARD_DIR)/generated/controllers/generated
 
diff --git a/default_tune.cpp b/default_tune.cpp
new file mode 100644
index 0000000..26cd070
--- /dev/null
+++ b/default_tune.cpp
@@ -0,0 +1,5 @@
+#include "pch.h"
+
+void boardTuneDefaults() {
+    engineConfiguration->displacement = 1.7;
+}