For Mercedes-Benz owners and automotive technicians, achieving the perfect suspension setup is crucial for both performance and comfort. The Star Configuration Utility Xentry 2013 is an indispensable tool in this process, allowing for precise adjustments to the air suspension systems found in many Mercedes models. This guide delves into the intricacies of using Xentry 2013 for suspension calibration, drawing on practical experience to optimize your vehicle’s ride height and handling.
Understanding the nuances of air suspension, particularly the relationship between ride height and voltage, is paramount. In systems like the one found in the 2007 E63 AMG, voltage readings are critical. For instance, with aftermarket adjustable camber upper arms, achieving a front ride height of 25 7/8 inches corresponded to a voltage of 1.9V, safely within the recommended 1.8-2.8V range for the front left sensor (LF). Pushing the ride height higher could lead to voltage readings dangerously close to or below the 1.8V threshold, resulting in calibration failures. The front inclination angle also varies with ride height, moving from 3.1 degrees at lower settings to 4.1 degrees at higher ones.
To overcome limitations in ride height adjustability, especially when using aftermarket components, custom adjustable links become essential. By installing shorter adjustable links in the front, it becomes possible to raise the front ride height to 26 15/16 inches, achieving an inclination of approximately 3.8 degrees. However, attempting to increase it further to 4.1 degrees might not yield significant lift when engaging the vehicle’s lift button. Raising the front subsequently allows for raising the rear to a maximum of around 27 1/8 inches on the driver’s side (and 27 5/8 inches on the passenger side), at about -1.0 degree inclination. Exceeding these rear height limits, even if the manual lift function provides a temporary 10mm increase, can lead to voltage issues. If the rear voltage falls outside the acceptable range, the suspension will revert to a lower setting, around 25 1/2 inches in the front, even with custom links installed.
Alt text: Mercedes Xentry 2013 diagnostic interface displaying air suspension calibration settings, essential for precise ride height adjustments.
Accurate calibration with Xentry 2013 hinges on precise measurements. After determining the maximum achievable rear ride height within the voltage range (e.g., 27 9/16 inches on the driver’s side), and then lowering it by 10mm to 27 1/8 inches, the corresponding inclination angle (-1.0 degree) can be input into Xentry. This process ensures successful calibration. While Xentry allows for individual air spring adjustments in the rear, automatic suspension setting relies on the average bar pressure, which is uniform for both rear springs. Minor side-to-side sag, such as a 3/16 inch difference, might occur, possibly due to uneven flooring, but is generally inconsequential. For rear axle angle values, without custom front links, a lower rear height of approximately 26 1/2 inches corresponds to a -1.5 degree angle. Increasing the height to around 26 15/16 inches results in a -0.9 degree angle.
A common post-calibration issue is the suspension reverting to a lower front ride height (e.g., 25 1/2 inches, or 26 inches with custom links) after ignition is switched off and Xentry is disconnected. Upon reconnecting Xentry and accessing Automatic Calibration, the system might display incorrect, outdated settings instead of the most recent successful update from Initial Startup Calibration. This problem often stems from inaccurate inclination angle measurements. Using a smartphone inclination angle app can be effective, but precision is crucial. Measuring angles using the back of the phone lengthwise against front nubs and the rear axle itself, while ensuring the phone is level, provides more accurate readings than using the phone’s sides.
Alt text: Automotive technician utilizing Mercedes Xentry 2013 software on a laptop for detailed diagnostics of a Mercedes-Benz air suspension system.
Some sources suggest a procedure involving closing Xentry, starting the vehicle, manually raising the suspension for two minutes using the ride height button, then lowering and waiting two minutes before measuring. However, in some cases, the front suspension might still revert to a lowered 25 1/2 inch setting upon startup. A more effective approach after successful adjustment in Xentry is to start the car and disconnect the MUX (multiplexer) without closing the Xentry software. Allow the car to idle for a minute, then raise the suspension using the button for two minutes and lower it again. If the suspension settles at the desired height, the calibration is successful. If not, re-verify voltage readings and calibration parameters within Xentry 2013. By meticulously following these steps and understanding the interplay of voltage, ride height, and Xentry 2013, you can effectively master Mercedes-Benz air suspension adjustments.
