diff --git a/Engines/cfm56_5a1.xml b/Engines/cfm56_5a1.xml
index 1d269ac8..0d275c85 100644
--- a/Engines/cfm56_5a1.xml
+++ b/Engines/cfm56_5a1.xml
@@ -2,8 +2,8 @@
 
 <turbine_engine name="CFM56_5A1">
   <milthrust>     27000 </milthrust> <!-- Will put proper thrust amount once FDE sorted out -->
-  <bypassratio>     7.2 </bypassratio>
-  <tsfc>          0.412 </tsfc>
+  <bypassratio>     8.1 </bypassratio>
+  <tsfc>            0.5 </tsfc>
   <bleed>          0.03 </bleed>
   <idlen1>         22.4 </idlen1>
   <idlen2>         60.9 </idlen2>
diff --git a/Engines/cfm56_5b3.xml b/Engines/cfm56_5b3.xml
index a30d5cbe..7fd73b02 100644
--- a/Engines/cfm56_5b3.xml
+++ b/Engines/cfm56_5b3.xml
@@ -2,8 +2,8 @@
 
 <turbine_engine name="CFM56_5B3">
   <milthrust>     27000 </milthrust> <!-- Will put proper thrust amount once FDE sorted out -->
-  <bypassratio>     7.2 </bypassratio>
-  <tsfc>          0.412 </tsfc>
+  <bypassratio>     8.1 </bypassratio>
+  <tsfc>            0.5 </tsfc>
   <bleed>          0.03 </bleed>
   <idlen1>         22.4 </idlen1>
   <idlen2>         60.9 </idlen2>
diff --git a/Engines/cfm56_5b4.xml b/Engines/cfm56_5b4.xml
index 315abf3a..6d9cd7e0 100644
--- a/Engines/cfm56_5b4.xml
+++ b/Engines/cfm56_5b4.xml
@@ -2,8 +2,8 @@
 
 <turbine_engine name="CFM56_5B4">
   <milthrust>     27000 </milthrust>
-  <bypassratio>     7.2 </bypassratio>
-  <tsfc>          0.412 </tsfc>
+  <bypassratio>     8.1 </bypassratio>
+  <tsfc>            0.5 </tsfc>
   <bleed>          0.03 </bleed>
   <idlen1>         22.4 </idlen1>
   <idlen2>         60.9 </idlen2>
diff --git a/Engines/cfm56_5b6.xml b/Engines/cfm56_5b6.xml
index 01510828..21d7fbaa 100644
--- a/Engines/cfm56_5b6.xml
+++ b/Engines/cfm56_5b6.xml
@@ -2,8 +2,8 @@
 
 <turbine_engine name="CFM56_5B6">
   <milthrust>     27000 </milthrust> <!-- Will put proper thrust amount once FDE sorted out -->
-  <bypassratio>     7.2 </bypassratio>
-  <tsfc>          0.412 </tsfc>
+  <bypassratio>     8.1 </bypassratio>
+  <tsfc>            0.5 </tsfc>
   <bleed>          0.03 </bleed>
   <idlen1>         22.4 </idlen1>
   <idlen2>         60.9 </idlen2>
diff --git a/Engines/leap1a26.xml b/Engines/leap1a26.xml
index 3a11f61e..27b38804 100644
--- a/Engines/leap1a26.xml
+++ b/Engines/leap1a26.xml
@@ -2,8 +2,8 @@
 
 <turbine_engine name="leap1a26">
   <milthrust>     27000 </milthrust> <!-- Will put proper thrust amount once FDE sorted out -->
-  <bypassratio>     7.2 </bypassratio>
-  <tsfc>          0.412 </tsfc>
+  <bypassratio>     8.1 </bypassratio>
+  <tsfc>            0.5 </tsfc>
   <bleed>          0.03 </bleed>
   <idlen1>         22.4 </idlen1>
   <idlen2>         60.9 </idlen2>
diff --git a/Engines/leap1a32.xml b/Engines/leap1a32.xml
index fdfb0764..a19244f0 100644
--- a/Engines/leap1a32.xml
+++ b/Engines/leap1a32.xml
@@ -2,8 +2,8 @@
 
 <turbine_engine name="leap1a32">
   <milthrust>     27000 </milthrust> <!-- Will put proper thrust amount once FDE sorted out -->
-  <bypassratio>     7.2 </bypassratio>
-  <tsfc>          0.412 </tsfc>
+  <bypassratio>     8.1 </bypassratio>
+  <tsfc>            0.5 </tsfc>
   <bleed>          0.03 </bleed>
   <idlen1>         22.4 </idlen1>
   <idlen2>         60.9 </idlen2>
diff --git a/Engines/v2522_a5.xml b/Engines/v2522_a5.xml
index c1c38516..c663509b 100644
--- a/Engines/v2522_a5.xml
+++ b/Engines/v2522_a5.xml
@@ -2,8 +2,8 @@
 
 <turbine_engine name="V2527_A5">
   <milthrust>     26600 </milthrust> <!-- Will put proper thrust amount once FDE sorted out -->
-  <bypassratio>     7.1 </bypassratio>
-  <tsfc>          0.412 </tsfc>
+  <bypassratio>    10.1 </bypassratio>
+  <tsfc>            0.5 </tsfc>
   <bleed>          0.03 </bleed>
   <idlen1>         22.4 </idlen1>
   <idlen2>         60.9 </idlen2>
diff --git a/Engines/v2527_a5.xml b/Engines/v2527_a5.xml
index cfdcc9ad..a88fa781 100644
--- a/Engines/v2527_a5.xml
+++ b/Engines/v2527_a5.xml
@@ -2,8 +2,8 @@
 
 <turbine_engine name="V2527_A5">
   <milthrust>     26600 </milthrust>
-  <bypassratio>     7.1 </bypassratio>
-  <tsfc>          0.412 </tsfc>
+  <bypassratio>    10.1 </bypassratio>
+  <tsfc>            0.5 </tsfc>
   <bleed>          0.03 </bleed>
   <idlen1>         22.4 </idlen1>
   <idlen2>         60.9 </idlen2>
diff --git a/Engines/v2533_a5.xml b/Engines/v2533_a5.xml
index c1c38516..c663509b 100644
--- a/Engines/v2533_a5.xml
+++ b/Engines/v2533_a5.xml
@@ -2,8 +2,8 @@
 
 <turbine_engine name="V2527_A5">
   <milthrust>     26600 </milthrust> <!-- Will put proper thrust amount once FDE sorted out -->
-  <bypassratio>     7.1 </bypassratio>
-  <tsfc>          0.412 </tsfc>
+  <bypassratio>    10.1 </bypassratio>
+  <tsfc>            0.5 </tsfc>
   <bleed>          0.03 </bleed>
   <idlen1>         22.4 </idlen1>
   <idlen2>         60.9 </idlen2>