After Dinan released the springs for our car, I was curious if they would be working on a Shockwave software upgrade. This upgrade essentially tunes the adaptive damping algorithm. Turns out they aren't, so naturally I tried to figure out what I could do myself.
I did some logging on the adaptive damper valve in our car, and found that it seemed that higher currents led to a stiffer shock. Look at the "comfort" mode and "sport mode 900ma target" plots below. That is the same road driven with the same aggressiveness. It's clear visually as well as from the average current that sport mode has more current.
I did some research, and found that historically the BMW EDC system was the opposite - no current was stiff and more current was softer. Hmmm...so I found a press release saying that Tenneco is the supplier for BMW X3:
https://www.businesswire.com/news/ho...hicle-Platform
It is their CVSAe platform, so I scoured around for an explanation on how they work. Found this video:
Check out the 2 minute mark - 1.6amps for sports driving and 0.29 amps for comfort. Brilliant - exactly what I was seeing in the data.
So I looked at the VDC module, and it turns out you can increase the current target (but it is still capped at 1.6 amps) for the EDC system with the following coding parameters:
AusgabeSollstromVA_VDC1
AusgabeSollstromVA_Zug_VDC2
AusgabeSollstromVA_Druck_VDC2
AusgabeSollstromHA_VDC1
AusgabeSollstromHA_Zug_VDC2
AusgabeSollstromHA_Druck_VDC2
All of the 'VDC1' parameters are set at 400, whereas the VDC2 are set at 900. So VDC2 = Sport and VDC1 = Comfort. I changed all the VDC2 values to 1100.
Then I went for a drive, and you can see the last plot with the 1100ma target current. Much more dampening applied from the data, and felt firmer as well. Felt flatter in corners, and like it had less understeer.
I used Bimmergeeks ProTool for all the logging, investigation and coding:
https://www.bimmergeeks.net/protool
I'm also curious about the difference between Druck and Zug, and HA and VA. I found on specific engineering reference in German wrt Druck and Zug, seems to be compression/rebound, respectively. Which might make sense:
https://www.proz.com/kudoz/german-to...zug-druck.html
Anyone else want to try and comment on what it does for them?