How To: VCDS Logging on B8 S4

[sakimano]

The fact the regular existing tunes bombed on those models without some changes is a pretty good sign these tuners don’t do their homework, and rush products out while hoping they work.

ftfy

[b5b4b8]

So, just a heads up for now that if you have a newer car, some of the fields may be different both in name and ID#.

For my car the name/ID’s changed with some releases of VCDS… They seem to get more complete with newer releases, but he ID#'s can shift around… Can be frustrating to re-find everything if you have saved parameter files.

[jran76]

So, just a heads up for now that if you have a newer car, some of the fields may be different both in name and ID#.

For my car the name/ID’s changed with some releases of VCDS… They seem to get more complete with newer releases, but he ID#'s can shift around… Can be frustrating to re-find everything if you have saved parameter files.

Good point. There is a new release from the last few weeks. My plan is to update to the newer version, and then figure it out for both ECU’s.

In this case, I literally unplugged from my 2012, plugged it into the 2015, selected the same parameter file, and a bunch of weird stuff was checked that I’d never heard of. When I went looking for the fields I normally log, half of them had slightly different names.

[primetime]

Wrong thread! lol

[jran76]

Just a quick update on the new version of VCDS (15.7.4). Several people have reported very low resolution when logging 10 parameters with Grouping/Turbo enabled. In my case, I was only getting a couple lines of data on an entire 1/4-mile pass.

Another member changed some settings as recommended by Ross-Tech, and it seemed to help. I’ve posted the changes he made below. If you are having issues with 15.7.4, you may want to try these changes.

http://www.ross-tech.com/vag-com/faq_4.php#4.8
http://www.ross-tech.com/vag-com/tour/option_screen.html

I changed the parameters as per the Ross tech link above

Blk Int affects the protocol timing. The current default value is 55. To get the highest sample rate possible in the Measuring Blocks screen, set this to 25. Note, however, that this may cause unreliable communications with some controllers.

Char lnt also affects the protocol timing. The current default value is 1. To get the highest sample rate possible in the Measuring Blocks screen, set this to 0. Note, however, that this may cause unreliable communications with some controllers.

[jran76]

For B8.5:
Group Number: Parameter Field (Units; details)

Group 2: Accelerator position (%)
Group 11: Charge air pressure specified value (hPa)
Group 24: Engine speed (rpm)
Group 134: Air mass (kg/h)
Group 226: Ignition angle; actual (degrees)
Group 228: Intake air temperature (in degrees C)
Group 230: Intake manifold pressure; absolute (hPa)
Group 480-485: IGA_AD_1_KNK_x (knock correction in degrees; x is cylinder number 0-5)
Group 616: RFP_AV (bypass valve %)