diff --git a/reference/speeduino.ini b/reference/speeduino.ini
index af0c8ccf..ba910b7c 100644
--- a/reference/speeduino.ini
+++ b/reference/speeduino.ini
@@ -2393,6 +2393,7 @@ cmdtestspk450dc = "E\x03\x0C"
    boostCutOut      = { boostCutFuel || boostCutSpark }
    lambda           = { afr / stoich }
    MAPxRPM          = { rpm * map }
+   loopsPerRev      = { loopsPerSecond / (rpm / 60) }
 
    ;Manifold pressure in weirdo units
    map_bar      = { (map - baro) / 101.33 }