[chrxme]

I have been working with my tuner to dial in a custom tune for the last 2 months now and for some odd reason I have been running into wgdc issues intermittently. I have a BMW 340i xDrive with a DAW Flowmax+ v2.5, Dorch 2.5 hpfp (E40), Dinan closed air intake, and a catless downpipe.

My tuner is confused because one log will look great and after some minimal changes for a new revision, the new logs show wgdc all over the place. I have done multiple smoke tests to check for boosts leaks and the intake side is fine. I only see a bit of smoke coming from the CCV side of the turbo inlet connection but not much since there’s no seal on that connection. I’m confused as to why some logs look fine and others will show wgdc and boost oscillations.

I have attached my last two revisions to show this issue, the first log looks much better than the latest one. These two revisions were consecutive.

2nd to last log:
https://www.bootmod3.net/log?id=6601...363507f17d2889

Latest log:
https://www.bootmod3.net/log?id=6603...4b1d45a7be8fe1

I would love to hear any ideas on what my issue could be since I have been scratching my head for the last couple weeks.

[WrxToBeamerGuy]

Originally Posted by chrxme

I have been working with my tuner to dial in a custom tune for the last 2 months now and for some odd reason I have been running into wgdc issues intermittently. I have a BMW 340i xDrive with a DAW Flowmax+ v2.5, Dorch 2.5 hpfp (E40), Dinan closed air intake, and a catless downpipe.

My tuner is confused because one log will look great and after some minimal changes for a new revision, the new logs show wgdc all over the place. I have done multiple smoke tests to check for boosts leaks and the intake side is fine. I only see a bit of smoke coming from the CCV side of the turbo inlet connection but not much since there’s no seal on that connection. I’m confused as to why some logs look fine and others will show wgdc and boost oscillations.

I have attached my last two revisions to show this issue, the first log looks much better than the latest one. These two revisions were consecutive.

2nd to last log:
https://www.bootmod3.net/log?id=6601...363507f17d2889

Latest log:
https://www.bootmod3.net/log?id=6603...4b1d45a7be8fe1

I would love to hear any ideas on what my issue could be since I have been scratching my head for the last couple weeks.

Ask him if he increases the I-Gain table in his tune. Oscillations can be caused by an I-Gain that is set too high.