diff --git a/f4pga/wrappers/sh/quicklogic/vpr_common.f4pga.sh b/f4pga/wrappers/sh/quicklogic/vpr_common.f4pga.sh
index 068450f..8ff053b 100755
--- a/f4pga/wrappers/sh/quicklogic/vpr_common.f4pga.sh
+++ b/f4pga/wrappers/sh/quicklogic/vpr_common.f4pga.sh
@@ -18,6 +18,16 @@
 
 SHARE_DIR_PATH=${SHARE_DIR_PATH:="$F4PGA_ENV_SHARE"}
 
+if [ -z $VPR_OPTIONS ]; then
+     echo "Using default VPR options."
+     VPR_OPTIONS="
+       --max_router_iterations 500
+       --routing_failure_predictor off
+       --router_high_fanout_threshold -1
+       --constant_net_method route
+       "
+fi
+
 function parse_args {
 
      OPTS=d:f:e:p:n:P:j:s:t:c:
@@ -135,14 +145,39 @@ function parse_args {
 
      export DEVICE_NAME=${DEVICE_1}
 
-     export VPR_CONFIG=`realpath $(dirname "$0")/vpr_config.f4pga.sh`
+     if [[ "$DEVICE" == "qlf_k4n8_qlf_k4n8" ]]; then
+	     VPR_OPTIONS="$VPR_OPTIONS
+	     --route_chan_width 10
+	     --clock_modeling ideal
+	     --place_delta_delay_matrix_calculation_method dijkstra
+	     --place_delay_model delta_override
+	     --router_lookahead extended_map
+	     --allow_dangling_combinational_nodes on
+	     --absorb_buffer_luts off"
+     else
+	     VPR_OPTIONS="$VPR_OPTIONS
+	     --route_chan_width 100
+	     --clock_modeling route
+	     --place_delay_model delta_override
+	     --router_lookahead extended_map
+	     --check_route quick
+	     --strict_checks off
+	     --allow_dangling_combinational_nodes on
+	     --disable_errors check_unbuffered_edges:check_route
+	     --congested_routing_iteration_threshold 0.8
+	     --incremental_reroute_delay_ripup off
+	     --base_cost_type delay_normalized_length_bounded
+	     --bb_factor 10
+	     --initial_pres_fac 4.0
+	     --check_rr_graph off
+	     --pack_high_fanout_threshold PB-LOGIC:18
+	     --suppress_warnings ${OUT_NOISY_WARNINGS},sum_pin_class:check_unbuffered_edges:load_rr_indexed_data_T_values:check_rr_node:trans_per_R:check_route:set_rr_graph_tool_comment"
+     fi
 }
 
 function run_vpr {
      set -e
 
-     source ${VPR_CONFIG}
-
      SDC_OPTIONS=""
      if [ ! -z $SDC ]
      then
@@ -151,11 +186,11 @@ function run_vpr {
 
      vpr ${ARCH_DEF} \
          ${EBLIF} \
+         --read_rr_graph ${RR_GRAPH} \
          --device ${DEVICE_NAME} \
          ${VPR_OPTIONS} \
-         --read_rr_graph ${RR_GRAPH} \
-         --read_placement_delay_lookup ${PLACE_DELAY} \
          --read_router_lookahead ${ROUTE_DELAY} \
+         --read_placement_delay_lookup ${PLACE_DELAY} \
          ${SDC_OPTIONS} \
          $@
 
@@ -165,8 +200,6 @@ function run_vpr {
 function run_genfasm {
      set -e
 
-     source ${VPR_CONFIG}
-
      genfasm ${ARCH_DEF} \
          ${EBLIF} \
          --device ${DEVICE_NAME} \
diff --git a/f4pga/wrappers/sh/quicklogic/vpr_config.f4pga.sh b/f4pga/wrappers/sh/quicklogic/vpr_config.f4pga.sh
deleted file mode 100755
index 5b8ca1a..0000000
--- a/f4pga/wrappers/sh/quicklogic/vpr_config.f4pga.sh
+++ /dev/null
@@ -1,19 +0,0 @@
-#!/usr/bin/env sh
-#
-# Copyright (C) 2020-2022 F4PGA Authors.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     https://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-#
-# SPDX-License-Identifier: Apache-2.0
-
-VPR_OPTIONS="@VPR_ARGS@"