diff --git a/rowers/dataprep.py b/rowers/dataprep.py
index 6fa013b4..393c5fc1 100644
--- a/rowers/dataprep.py
+++ b/rowers/dataprep.py
@@ -295,6 +295,12 @@ def clean_df_stats(datadf, workstrokesonly=True, ignorehr=True,
         except KeyError:
             pass
 
+    try:
+        mask = datadf['efficiency'] > 200.
+        datadf.loc[mask, 'efficiency'] = np.nan
+    except KeyError:
+        pass
+        
     try:
         mask = datadf['spm'] < 10
         datadf.loc[mask, 'spm'] = np.nan
diff --git a/rowers/metrics.py b/rowers/metrics.py
index cc9f8644..bfac6b1f 100644
--- a/rowers/metrics.py
+++ b/rowers/metrics.py
@@ -65,7 +65,7 @@ rowingmetrics = (
         'null':True,
         'verbose_name': 'Average Drive Force (N)',
         'ax_min': 0,
-        'ax_max': 900,
+        'ax_max': 1200,
         'mode':'both',
         'type': 'pro'}),
     
@@ -74,7 +74,7 @@ rowingmetrics = (
         'null':True,
         'verbose_name': 'Peak Drive Force (N)',
         'ax_min': 0,
-        'ax_max': 900,
+        'ax_max': 1500,
         'mode':'both',
         'type': 'pro'}),