diff --git a/GameData/RealismOverhaul/Engine_Configs/A-4_Config.cfg b/GameData/RealismOverhaul/Engine_Configs/A-4_Config.cfg
index 649ed6ad24..e6ea42abd7 100644
--- a/GameData/RealismOverhaul/Engine_Configs/A-4_Config.cfg
+++ b/GameData/RealismOverhaul/Engine_Configs/A-4_Config.cfg
@@ -88,6 +88,7 @@
 			minThrust = 284.68
 			maxEngineTemp = 3000
 			chamberNominalTemp = 2923
+			massMult = 1.0
 	
 			atmosphereCurve
 			{
@@ -145,6 +146,7 @@
 			maxEngineTemp = 3000
 			chamberNominalTemp = 2923
 			specLevel = speculative
+			massMult = 1.045
 
 			atmosphereCurve
 			{
@@ -185,11 +187,11 @@
 			TESTFLIGHT:NEEDS[TestLite|TestFlight]
 			{
 				ratedBurnTime = 115
-				ignitionReliabilityStart = 0.8
-				ignitionReliabilityEnd = 0.9
+				ignitionReliabilityStart = 0.87
+				ignitionReliabilityEnd = 0.98
 				ignitionDynPresFailMultiplier = 4.0
-				cycleReliabilityStart = 0.73
-				cycleReliabilityEnd = 0.9
+				cycleReliabilityStart = 0.7
+				cycleReliabilityEnd = 0.94
 			}
 		}
 	}