diff --git a/src/overlay/rfactor_data.rs b/src/overlay/rfactor_data.rs
index 59a69f4..16c61ee 100644
--- a/src/overlay/rfactor_data.rs
+++ b/src/overlay/rfactor_data.rs
@@ -1,5 +1,5 @@
 use anyhow::Result;
-use cgmath::{ortho, vec2, vec3, Deg, InnerSpace, Matrix4, Rad, Vector2, Vector3};
+use cgmath::{ortho, vec2, vec3, vec4, Deg, InnerSpace, Matrix4, Rad, Vector2, Vector3};
 use rfactor_sm_reader::*;
 use vulkan_rs::prelude::*;
 
@@ -69,14 +69,15 @@ impl RFactorData {
         write_log!(" =================== create RFactorData ===================");
 
         let radar_extent = width as f32 * 0.075 * config.radar_scale;
-        let car_height = radar_extent * 0.2;
-        let car_width = car_height * 0.5;
+        let car_height = radar_extent * 0.15;
+        let car_width = car_height / 2.5;
         let radar_center = vec2(
             width as f32 / 2.0,
-            height as f32 / 2.0 + height as f32 * 0.25,
+            height as f32 / 2.0 - height as f32 * 0.25,
         );
 
-        let ortho = ortho(0.0, width as f32, 0.0, height as f32, -1.0, 1.0);
+        let flip_y = matrix4_from_diagonal(vec3(1.0, -1.0, 1.0));
+        let ortho = flip_y * ortho(0.0, width as f32, 0.0, height as f32, -1.0, 1.0);
         let start_time = Instant::now();
 
         Ok(Self {
@@ -379,7 +380,7 @@ impl CarPosition {
     fn new(position: Vector3<f32>, orientation: [Vector3<f32>; 3]) -> Self {
         Self {
             position,
-            rotation: Rad(orientation[2].x.atan2(orientation[2].y)),
+            rotation: Rad(orientation[2].x.atan2(orientation[2].z)),
         }
     }
 }
@@ -392,3 +393,12 @@ impl Default for CarPosition {
         }
     }
 }
+
+const fn matrix4_from_diagonal(diagonal: Vector3<f32>) -> Matrix4<f32> {
+    Matrix4::from_cols(
+        vec4(diagonal.x, 0.0, 0.0, 0.0),
+        vec4(0.0, diagonal.y, 0.0, 0.0),
+        vec4(0.0, 0.0, diagonal.z, 0.0),
+        vec4(0.0, 0.0, 0.0, 1.0),
+    )
+}