diff --git a/Trigger/TrigValidation/TrigAnalysisTest/share/ref_RDOtoRDOTrig_v1Dev_build.ref b/Trigger/TrigValidation/TrigAnalysisTest/share/ref_RDOtoRDOTrig_v1Dev_build.ref
index 414b0e81e5a45fb544eb9b3503687072bcbcfb6c..5bd0903da08848f50864551c1ceed1052ece0523 100644
--- a/Trigger/TrigValidation/TrigAnalysisTest/share/ref_RDOtoRDOTrig_v1Dev_build.ref
+++ b/Trigger/TrigValidation/TrigAnalysisTest/share/ref_RDOtoRDOTrig_v1Dev_build.ref
@@ -2462,6 +2462,12 @@ HLT_3j35_0eta290_020jvt_bgn170_j35_pf_ftf_presel2j25XX2j25b85_L14jJ40p0ETA25:
     1: 18
     2: 114
     3: 18
+HLT_3j45_j45_2timeSig_L14jJ40:
+  eventCount: 3
+  stepCounts:
+    0: 3
+  stepFeatures:
+    0: 40
 HLT_3j45_j45_2timeSig_roiftf_presel4c35_L14jJ40p0ETA25:
   eventCount: 3
   stepCounts:
@@ -2470,6 +2476,18 @@ HLT_3j45_j45_2timeSig_roiftf_presel4c35_L14jJ40p0ETA25:
   stepFeatures:
     0: 26
     1: 40
+HLT_3j45_j45_2timing_L14jJ40:
+  eventCount: 3
+  stepCounts:
+    0: 3
+  stepFeatures:
+    0: 37
+HLT_3j45_j45_3timeSig_L14jJ40:
+  eventCount: 3
+  stepCounts:
+    0: 3
+  stepFeatures:
+    0: 35
 HLT_3j60_0eta290_020jvt_bdl1d77_pf_ftf_presel3j45b95_L13J35p0ETA23:
   eventCount: 0
   stepCounts:
@@ -15180,6 +15198,12 @@ HLT_j210_0eta290_020jvt_bgn170_pf_ftf_preselj200_L1jJ160:
     0: 1
 HLT_j220_320eta490_L1J75p31ETA49:
   eventCount: 0
+HLT_j220_j150_2timeSig_L1jJ160:
+  eventCount: 0
+HLT_j220_j150_2timing_L1jJ160:
+  eventCount: 0
+HLT_j220_j150_3timeSig_L1jJ160:
+  eventCount: 0
 HLT_j220f_L1J75p31ETA49:
   eventCount: 0
 HLT_j220f_L1jJ125p30ETA49:
diff --git a/Trigger/TrigValidation/TrigP1Test/share/ref_v1Dev_decodeBS_build.ref b/Trigger/TrigValidation/TrigP1Test/share/ref_v1Dev_decodeBS_build.ref
index 0cc9e52ca1d586897221bb9dba059377cdc38310..9e5d11e41be26f9c151b1b8e55cde332d6cd9744 100644
--- a/Trigger/TrigValidation/TrigP1Test/share/ref_v1Dev_decodeBS_build.ref
+++ b/Trigger/TrigValidation/TrigP1Test/share/ref_v1Dev_decodeBS_build.ref
@@ -925,8 +925,14 @@ HLT_3j35_0eta290_020jvt_bgn170_j35_pf_ftf_presel2j25XX2j25b85_L14J15p0ETA25:
   eventCount: 0
 HLT_3j35_0eta290_020jvt_bgn170_j35_pf_ftf_presel2j25XX2j25b85_L14jJ40p0ETA25:
   eventCount: 0
+HLT_3j45_j45_2timeSig_L14jJ40:
+  eventCount: 0
 HLT_3j45_j45_2timeSig_roiftf_presel4c35_L14jJ40p0ETA25:
   eventCount: 0
+HLT_3j45_j45_2timing_L14jJ40:
+  eventCount: 0
+HLT_3j45_j45_3timeSig_L14jJ40:
+  eventCount: 0
 HLT_3j60_0eta290_020jvt_bdl1d77_pf_ftf_presel3j45b95_L13J35p0ETA23:
   eventCount: 0
 HLT_3j60_0eta290_020jvt_bdl1d77_pf_ftf_presel3j45b95_L13jJ70p0ETA23:
@@ -5849,6 +5855,12 @@ HLT_j210_0eta290_020jvt_bgn170_pf_ftf_preselj200_L1jJ160:
   eventCount: 0
 HLT_j220_320eta490_L1J75p31ETA49:
   eventCount: 0
+HLT_j220_j150_2timeSig_L1jJ160:
+  eventCount: 0
+HLT_j220_j150_2timing_L1jJ160:
+  eventCount: 0
+HLT_j220_j150_3timeSig_L1jJ160:
+  eventCount: 0
 HLT_j220f_L1J75p31ETA49:
   eventCount: 0
 HLT_j220f_L1jJ125p30ETA49:
diff --git a/Trigger/TriggerCommon/TriggerMenuMT/python/HLT/Menu/Dev_pp_run3_v1.py b/Trigger/TriggerCommon/TriggerMenuMT/python/HLT/Menu/Dev_pp_run3_v1.py
index 546efbf478f5bb6626d6f5f0d8d2f28e56394fba..ad4369045b257771e687f36a02e6b40d332b2992 100644
--- a/Trigger/TriggerCommon/TriggerMenuMT/python/HLT/Menu/Dev_pp_run3_v1.py
+++ b/Trigger/TriggerCommon/TriggerMenuMT/python/HLT/Menu/Dev_pp_run3_v1.py
@@ -458,6 +458,14 @@ def getDevSignatures():
         # ATR-28103 Test chains for delayed jets, based on significance of delay
         ChainProp(name='HLT_3j45_j45_2timeSig_roiftf_presel4c35_L14jJ40p0ETA25', l1SeedThresholds=['FSNOSEED']*2, groups=MultiJetGroup+DevGroup), 
 
+        # ATR-28836 additional delayed jets more delay significance thresholds
+        ChainProp(name='HLT_3j45_j45_2timeSig_L14jJ40', l1SeedThresholds=['FSNOSEED']*2, groups=MultiJetGroup+DevGroup),
+        ChainProp(name='HLT_j220_j150_2timeSig_L1jJ160', l1SeedThresholds=['FSNOSEED']*2, groups=MultiJetGroup+DevGroup),
+        ChainProp(name='HLT_3j45_j45_3timeSig_L14jJ40', l1SeedThresholds=['FSNOSEED']*2, groups=MultiJetGroup+DevGroup),
+        ChainProp(name='HLT_j220_j150_3timeSig_L1jJ160', l1SeedThresholds=['FSNOSEED']*2, groups=MultiJetGroup+DevGroup),
+        ChainProp(name='HLT_3j45_j45_2timing_L14jJ40', l1SeedThresholds=['FSNOSEED']*2, groups=MultiJetGroup+DevGroup),
+        ChainProp(name='HLT_j220_j150_2timing_L1jJ160', l1SeedThresholds=['FSNOSEED']*2, groups=MultiJetGroup+DevGroup),
+
         ### END PURE TEST CHAINS
 
         # ATR-24838 Large R L1J100 jet chains with jLJ L1 items (L1J100->L1jLJ140)