diff --git a/himbaechel/arch.h b/himbaechel/arch.h
index 0f48063a..06cb92a7 100644
--- a/himbaechel/arch.h
+++ b/himbaechel/arch.h
@@ -673,8 +673,8 @@ struct Arch : BaseArch<ArchRanges>
     {
         return uarch->predictDelay(src_bel, src_pin, dst_bel, dst_pin);
     }
-    delay_t getDelayEpsilon() const override { return 20; }       // TODO
-    delay_t getRipupDelayPenalty() const override { return 120; } // TODO
+    delay_t getDelayEpsilon() const override { return 20; }                 // TODO
+    delay_t getRipupDelayPenalty() const override { return ripup_penalty; } // TODO
     float getDelayNS(delay_t v) const override { return v * 0.001; }
     delay_t getDelayFromNS(float ns) const override { return delay_t(ns * 1000); }
     uint32_t getDelayChecksum(delay_t v) const override { return v; }
@@ -909,6 +909,8 @@ struct Arch : BaseArch<ArchRanges>
     bool fast_pip_delays = false;
     dict<WireId, uint64_t> drive_res;
     dict<WireId, uint64_t> load_cap;
+
+    delay_t ripup_penalty = 120;
 };
 
 NEXTPNR_NAMESPACE_END
diff --git a/himbaechel/uarch/gowin/gowin.cc b/himbaechel/uarch/gowin/gowin.cc
index 3a48935a..d86bca98 100644
--- a/himbaechel/uarch/gowin/gowin.cc
+++ b/himbaechel/uarch/gowin/gowin.cc
@@ -39,6 +39,8 @@ struct GowinImpl : HimbaechelAPI
     bool isBelLocationValid(BelId bel, bool explain_invalid) const override;
     void notifyBelChange(BelId bel, CellInfo *cell) override;
 
+    delay_t estimateDelay(WireId src, WireId dst) const override;
+
     // Bel bucket functions
     IdString getBelBucketForCellType(IdString cell_type) const override;
 
@@ -118,6 +120,8 @@ struct GowinImpl : HimbaechelAPI
     bool hclk_valid(BelId bel, IdString bel_type) const;
 
     array2d<std::vector<CellInfo *>> fast_logic_cell;
+
+    delay_t delay_m, delay_c;
 };
 
 struct GowinArch : HimbaechelArch
@@ -248,6 +252,17 @@ void GowinImpl::init(Context *ctx)
     if (args.options.count("disable_gp_clock_routing")) {
         ctx->settings[id_NO_GP_CLOCK_ROUTING] = Property(1);
     }
+
+    // configure delay estimates for A*
+    if (args.device.rfind("GW2A", 0) == 0 || args.device.rfind("GW5A", 0) == 0) {
+        delay_c = 300;
+        delay_m = 60;
+        ctx->ripup_penalty = 400;
+    } else {
+        delay_c = 600;
+        delay_m = 120;
+        ctx->ripup_penalty = 800;
+    }
 }
 
 // We do not allow the use of global wires that bypass a special router.
@@ -1679,6 +1694,16 @@ void GowinImpl::drawBel(std::vector<GraphicElement> &g, GraphicElement::style_t
     }
 }
 
+delay_t GowinImpl::estimateDelay(WireId src, WireId dst) const
+{
+    int sx, sy, dx, dy;
+    tile_xy(ctx->chip_info, src.tile, sx, sy);
+    tile_xy(ctx->chip_info, dst.tile, dx, dy);
+    int dist_x = std::abs(dx - sx), dist_y = std::abs(dy - sy);
+    return delay_c + delay_m * (std::max(dist_x - 4, 0) + std::max(dist_y - 4, 0) +
+                                2 * (std::min(dist_x, 4) + std::min(dist_y, 4)));
+}
+
 } // namespace
 
 NEXTPNR_NAMESPACE_END