![]() ![]() ![]() Record the value displayed for future reference, and then uncheck the box. Step 8: Select the “Ambient Air Pressure” value from the parameter list. Values” button to access the logging section. Step 7: In the Engine Controller module, press the “Adv. Step 6: Under the “Common” tab press the “01-Engine” module button. Step 5: Under “Select Control Module” press the “Select” button. Once this is done, “Close” the Auto-Scan section, and return to the main menu. If there are faults, I would recommend saving the scan results (copy/paste, save, print), and then clear the faults with the “Clear all DTC’s” button. The scan will take a few minutes as it scans all modules. Step 4: Once in the Auto-Scan section, press the “Start” button to scan for codes. Press the “Auto-Scan” button on the VCDS main menu. Step 3: Before you start logging, ensure there are no fault codes. *Note: The car can be in the ON position or running for steps 1-11. Step 2: With the car on, launch the VCDS software. Step 1: Plug the Ross-Tech VCDS cable into the OBDII port under the dash on the driver’s side. An Apple/Mac that runs Windows will also work (Boot Camp, Parallels, etc.). *Logging must be done with Windows software. *While there are others ways to log a vehicle, this only covers using the full version of Ross-Tech software with their VCDS cable. Some conversion and calculation is required. In recent versions of the Ross-Tech software boost is not displayed as an absolute value. *One of the key things people like to log is requested and actual boost. ![]() Regardless, your version may be slightly different. I am using version 12.12.1 in the screen captures, but I have updated the parameters from version 15.7.1 (updated ). The name of the parameter will be similar from version to version, but the associated location number may be different. In terms of logging, the only real difference is the location number associated with each logging parameter. *Every version of Ross-Tech software is slightly different. This “how to” guide will cover how to perform basic performance logging, and also how to interpret some of the results. There are several parameters that can be logged that will give a good indication as to how your car is running, and if there are any problems. Logging is critical to understanding how your car is performing, and even more so if you are tuned. Several people have asked about logging their vehicle, so I put together a “how to” on logging with the Ross-Tech VCDS software and cable (VAGCOM). Original post here (good post to go along with this): I know this is long, but it’s meant to walk someone through logging step-by-step. If anyone has input on changes, I’m open. I recently updated this on the other site with values from VCDS version 15.7.1 and some other details, so here it is here. It would go into half power mode and put up CEL right quick.I originally posted this in the B8 S4 “Performance Expectations” thread, but I can’t update that post. Your car would freak out if you had a legit boost leak. Put a JB4 in there you will def hit some higher boost. Would that be the correct way to reason it, or should I be checking for a boost leak somewhere I am wondering with the electronic wastegate and with BMW stock tune that they tuned it for consistent output of power so in winter to hit "300lbs of torque" it only takes 7psi, and in the summer with less dense air and higher IATs that it will take 10psi to reach that output. Just wondering how are people getting 10psi? I logged my 435ix via OBD today and did I bunch of WOT runs. Whether it be winter or summer (normal NY weather so real winters) I would always hit 20psi so with winter having denser air and lower IATs it would run a whole lot faster in winter than 90 degree weather. On my previous car I was running a td05-16g turbo at 20psi. I read that stock boost pressure for the n55 is anywhere from 7-10psi ![]()
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