improve tuning

selfdrive/car/gm/interface.py

@@ -48,6 +48,8 @@ class CarInterface(CarInterfaceBase):
       ret.steerRatio = 15.7
       ret.steerRatioRear = 0.
       ret.centerToFront = ret.wheelbase * 0.4  # wild guess
+      ret.lateralTuning.pid.kiBP, ret.lateralTuning.pid.kpBP = [[0., 15.0], [0., 15.0]]
+      ret.lateralTuning.pid.kpV, ret.lateralTuning.pid.kiV = [[0.2, 0.4], [0.02, 0.08]]
 
     elif candidate == CAR.MALIBU:
       # supports stop and go, but initial engage must be above 18mph (which include conservatism)