$entityform = entity_create('entityform', array(
    'type' => "my_form",
    'created' => time(),
    'changed' => time(),
    'language' => LANGUAGE_NONE
  ));

  $wrapper = entity_metadata_wrapper('entityform', $entityform);

  $wrapper->field_text1 = "foo";
  $wrapper->field_text2 = "bar";
  $wrapper->field_entRef = $obj; <-- ?????