diff --git a/RotaxMonitor/data/script.js b/RotaxMonitor/data/script.js
index 573dcdf..a115e8e 100644
--- a/RotaxMonitor/data/script.js
+++ b/RotaxMonitor/data/script.js
@@ -150,6 +150,9 @@ function updateChart(data) {
         chartData.datasets[0].data.push(boxA.eng_rpm / 10);
         chartData.datasets[2].data.push(coils12A.spark_delay);
         chartData.datasets[3].data.push(coils34A.spark_delay);
+        chartData.datasets[1].data.push(0);
+        chartData.datasets[4].data.push(0);
+        chartData.datasets[5].data.push(0);
     }
 
     if (data.box_b) {
@@ -159,10 +162,13 @@ function updateChart(data) {
         chartData.datasets[1].data.push(boxB.eng_rpm / 10);
         chartData.datasets[4].data.push(coils12B.spark_delay);
         chartData.datasets[5].data.push(coils34B.spark_delay);
+        chartData.datasets[0].data.push(0);
+        chartData.datasets[2].data.push(0);
+        chartData.datasets[3].data.push(0);
     }
 
     // limite punti (tipo buffer)
-    if (chartData.labels.length > 50) {
+    if (chartData.labels.length > 100) {
         chartData.labels.shift();
         chartData.datasets.forEach(d => d.data.shift());
     }