Here's a reply to someone on another forum recently who asked about changing the values of the factory suspension. Proceed with caution.

I believe you can change the height settings using AlphaOBD, but it can be "exciting" to do that as the numbers at each corner (in MM) are not the same because of leveling, etc. You're literally changing the height settings in the computer which can be risky, so consider if it's worth it to you to do that. You do have the option of changing the sensor links to make "overall normal" a half-inch or so lower so you're kinda in what Aero mode provides while in "normal". Of course, when you hit 60-65, real Aero kicks in and lowers you another half inch...

 

All measurements should be in mm to input to the scanner. With a wiTECH you can adjust the mode heights and individual wheels, dunno about JScan.

Front Wheel Center Height – Measure the vertical distance between the front wheel center and the ground (in mm)

Front Cradle Height – Measure the vertical distance between the center of the cradle bolt.

Take the two measurements and subtract them to get the ride height. Refer to the Curb Height Specifications chart for specifications (3.12 in. - 3.9 in.).


Rear Wheel Center Height – Measure the vertical distance between the wheel center and the ground (should be same as front).

Rear Cradle Height – Measure the vertical distance between the center of the cradle bolt to the ground.

Take the two measurements and subtract them to get the ride height. Refer to the Curb Height Specifications chart for specifications (2.49 in. - 3.28 in.).

With a scan tool, using the routines under the ASCM, perform the following:
•Command the vehicle to Normal Ride Height (NRH).
•Perform the Curb Height Measurement and record the values for input to the scan tool .
•Perform the Write Suspension Height Values routine and input measurements recorded as prompted by scan tool.
•Command the vehicle to Normal Ride Height (NRH) again.
•Perform the Curb Height Measurement again and verify specifications .
•Run the Air Mass Calculation routine on the air suspension system.
•If necessary, add to the system or deflate to atmosphere using the ASCM routines, then repeat the Air Mass Calculation routine again until the system responds with Air Mass OK (188 to 216 bar-liters).
•Run the Height Sensor Check routine on the air suspension system.
•Enable the air suspension system.

This is an old scan guage thread that may show what to expect for values: ScanGauge II with X-Gauge for QuadraLift ASCM parameter...

Front cradle bolt:

Rear cradle bolt

 

Thanks you so much! recalibrate with no errors, but comes another questions, what's Air Mass Calculation routine? how to do it by my self?
Thanks in advance

 

The Air Mass Calculation routine should be built into JScan.