Did you test it before replacing it?
The best thing to do is to test it to make sure the rod motion is at the same vacuum range. However, we only had the 90 horsepower engine, the 115 hp engine may be a little different. The easy thing to do is to make sure the rod is the same length as before. See this article for pictures: http://www.myturbodiesel.com/1000q/a4/VNT-wastegate-adjust.htm
The best thing to do is to test it to make sure the rod motion is at the same vacuum range. However, we only had the 90 horsepower engine, the 115 hp engine may be a little different. The easy thing to do is to make sure the rod is the same length as before. See this article for pictures: http://www.myturbodiesel.com/1000q/a4/VNT-wastegate-adjust.htm