diff --git a/selfdrive/controls/lib/latcontrol_vehicle_tunes.py b/selfdrive/controls/lib/latcontrol_vehicle_tunes.py
index 0cf571b57..72537ebff 100644
--- a/selfdrive/controls/lib/latcontrol_vehicle_tunes.py
+++ b/selfdrive/controls/lib/latcontrol_vehicle_tunes.py
@@ -662,6 +662,10 @@ KIA_EV6_UNWIND_TAPER_LEFT = 0.56
 KIA_EV6_UNWIND_TAPER_RIGHT = 0.54
 KIA_EV6_BASE_UNWIND_TAPER_LEFT = 0.06
 KIA_EV6_BASE_UNWIND_TAPER_RIGHT = 0.05
+KIA_EV6_JWARM_BASE_TURN_IN_BOOST_LEFT = 0.12
+KIA_EV6_JWARM_BASE_TURN_IN_BOOST_RIGHT = 0.14
+KIA_EV6_JWARM_BASE_UNWIND_TAPER_LEFT = 0.15
+KIA_EV6_JWARM_BASE_UNWIND_TAPER_RIGHT = 0.16
 KIA_EV6_FRICTION_MULT = 1.01
 KIA_EV6_FRICTION_LAT_RISE = 0.18
 KIA_EV6_FRICTION_JERK_RISE = 0.22
@@ -2419,12 +2423,20 @@ def get_kia_ev6_ff_scale(desired_lateral_accel: float, desired_lateral_jerk: flo
                          _flm_vehicle_knob("hyundai_kia_ev6.unwind_taper_right", KIA_EV6_UNWIND_TAPER_RIGHT),
                        ) *
                          unwind_weight * (0.35 + 0.65 * low_speed_factor))
+  jwarm_tune = kia_ev6_lateral_testing_ground_active()
+  base_turn_in_boost = 1.0 + ((_kia_ev6_side_value(
+                                desired_lateral_accel,
+                                KIA_EV6_JWARM_BASE_TURN_IN_BOOST_LEFT,
+                                KIA_EV6_JWARM_BASE_TURN_IN_BOOST_RIGHT,
+                              ) if jwarm_tune else 0.0) * turn_in_weight * onset * cutoff)
   base_unwind_taper = 1.0 - (_kia_ev6_side_value(
                               desired_lateral_accel,
-                              _flm_vehicle_knob("hyundai_kia_ev6.base_unwind_taper_left", KIA_EV6_BASE_UNWIND_TAPER_LEFT),
-                              _flm_vehicle_knob("hyundai_kia_ev6.base_unwind_taper_right", KIA_EV6_BASE_UNWIND_TAPER_RIGHT),
+                              KIA_EV6_JWARM_BASE_UNWIND_TAPER_LEFT if jwarm_tune else
+                                _flm_vehicle_knob("hyundai_kia_ev6.base_unwind_taper_left", KIA_EV6_BASE_UNWIND_TAPER_LEFT),
+                              KIA_EV6_JWARM_BASE_UNWIND_TAPER_RIGHT if jwarm_tune else
+                                _flm_vehicle_knob("hyundai_kia_ev6.base_unwind_taper_right", KIA_EV6_BASE_UNWIND_TAPER_RIGHT),
                             ) * unwind_weight * onset * cutoff)
-  return base_unwind_taper + (extra_scale * turn_in_boost * max(unwind_taper, 0.0))
+  return (base_unwind_taper * base_turn_in_boost) + (extra_scale * turn_in_boost * max(unwind_taper, 0.0))
 
 
 def get_kia_ev6_friction_threshold(v_ego: float, desired_lateral_accel: float = 0.0, desired_lateral_jerk: float = 0.0) -> float:
diff --git a/selfdrive/controls/tests/test_latcontrol.py b/selfdrive/controls/tests/test_latcontrol.py
index 1695e2489..2a44188fd 100644
--- a/selfdrive/controls/tests/test_latcontrol.py
+++ b/selfdrive/controls/tests/test_latcontrol.py
@@ -5,6 +5,7 @@ from types import SimpleNamespace
 from cereal import car, custom, log
 import openpilot.selfdrive.controls.lib.latcontrol_torque as latcontrol_torque
 import openpilot.selfdrive.controls.lib.latcontrol_pid as latcontrol_pid
+import openpilot.selfdrive.controls.lib.latcontrol_vehicle_tunes as latcontrol_vehicle_tunes
 from opendbc.car.car_helpers import interfaces
 from opendbc.car.interfaces import CarInterfaceBase
 from opendbc.car.honda.values import CAR as HONDA, HondaFlags
@@ -1136,6 +1137,22 @@ class TestLatControl:
     assert unwind_left < 1.03
     assert unwind_right < 1.07
 
+  def test_kia_ev6_jwarm_testing_ground_phase_correction(self, monkeypatch):
+    clear_flm_runtime_overrides()
+    monkeypatch.setattr(latcontrol_vehicle_tunes, "kia_ev6_lateral_testing_ground_active", lambda: False)
+    normal_steady = get_kia_ev6_ff_scale(0.45, 0.0, 10.0)
+    normal_turn_in_left = get_kia_ev6_ff_scale(0.45, 0.7, 10.0)
+    normal_turn_in_right = get_kia_ev6_ff_scale(-0.45, -0.7, 10.0)
+    normal_unwind_left = get_kia_ev6_ff_scale(0.45, -0.7, 10.0)
+    normal_unwind_right = get_kia_ev6_ff_scale(-0.45, 0.7, 10.0)
+
+    monkeypatch.setattr(latcontrol_vehicle_tunes, "kia_ev6_lateral_testing_ground_active", lambda: True)
+    assert get_kia_ev6_ff_scale(0.45, 0.0, 10.0) == pytest.approx(normal_steady)
+    assert get_kia_ev6_ff_scale(0.45, 0.7, 10.0) > normal_turn_in_left + 0.08
+    assert get_kia_ev6_ff_scale(-0.45, -0.7, 10.0) > normal_turn_in_right + 0.10
+    assert get_kia_ev6_ff_scale(0.45, -0.7, 10.0) < normal_unwind_left - 0.07
+    assert get_kia_ev6_ff_scale(-0.45, 0.7, 10.0) < normal_unwind_right - 0.08
+
   def test_kia_ev6_center_taper_curve(self):
     assert get_kia_ev6_center_taper_scale(0.0, 25.0) < get_kia_ev6_center_taper_scale(0.0, 10.0)
     assert get_kia_ev6_center_taper_scale(0.0, 25.0) < get_kia_ev6_center_taper_scale(0.20, 25.0) <= 1.0
diff --git a/starpilot/common/testing_grounds.py b/starpilot/common/testing_grounds.py
index d664d03e8..de8f65ee1 100644
--- a/starpilot/common/testing_grounds.py
+++ b/starpilot/common/testing_grounds.py
@@ -69,8 +69,8 @@ TESTING_GROUNDS_SLOT_DEFINITIONS = (
   },
   {
     "id": TESTING_GROUND_6,
-    "name": "Kia EV6 Lateral",
-    "description": "Kia EV6 lateral sandbox.",
+    "name": "Jwarm EV6",
+    "description": "Jwarm's Kia EV6 lateral sandbox.",
     "aLabel": "A - Installed tune",
     "cLabel": "C - Firestar Tune",
   },