[madmantwo]

Originally Posted by Joe_135i

Nice! Did you get your turbos replaced because of the rattle or another issue?

They were smoking really bad, so I replaced them

[Joe_435i]

Originally Posted by ferocity02

Look at your logs. Is the DME commanding 0% WGDC when they are stuck open?

Mine fully open at random while cruising but the DME is commanding it. I have no clue why...

I have been logging mine and it looks like the dme is in fact commanding 0% at times. Is this something that can be fixed with a custom tune or is just the way our cars behave? It's just so annoying.

[bradsm87]

Originally Posted by ferocity02

I still have no idea why my DME is randomly commanding 0% WGDC. It's usually while cruising, rarely during stop and go driving, although it does happen occasionally. Someone on bimmer_********** suggested it was part of the DME conducting tests of the lambda probes.

Bingo

Originally Posted by ferocity02

that DME is still randomly commanding 0% WGDC while cruising and sometimes (rarely) in city traffic.

Originally Posted by Joe_135i

I have been logging mine and it looks like the dme is in fact commanding 0% at times. Is this something that can be fixed with a custom tune or is just the way our cars behave? It's just so annoying.

It is CILC. It's a clever design feature of the DME. It opens the wastegates during steady state driving to make individual cylinder AFR measurements and adjust accordingly so that all cylinders have the same AFR. Our piezo injectors aren't all made equal and they don't all age equally. They need a lot of DME smarts to keep them performing correctly.

[Joe_435i]

Originally Posted by bradsm87

Bingo





It is CILC. It's a clever design feature of the DME. It opens the wastegates during steady state driving to make individual cylinder AFR measurements and adjust accordingly so that all cylinders have the same AFR. Our piezo injectors aren't all made equal and they don't all age equally. They need a lot of DME smarts to keep them performing correctly.

So, this is normal? Or would a custom tune could fix this issue?

[bradsm87]

Originally Posted by Joe_135i

So, this is normal? Or would a custom tune could fix this issue?

It's normal operation rather than an issue. Custom tune will not stop it.

[madmantwo]

Update: I previously thought my new turbos had fixed this "problem" but once it got cold again I am noticing the same behavior. This makes sense given the new information in this thread, just wanted to clarify

[Joe_435i]

Originally Posted by madmantwo

Update: I previously thought my new turbos had fixed this "problem" but once it got cold again I am noticing the same behavior. This makes sense given the new information in this thread, just wanted to clarify

That sucks... I remember when I got my new turbos and thought it was fixed as well. Unfortunately, we can conclude that this is in fact normal behavior for our cars.

You are right though, it does happen more often when it's cold outside.

[Joe_435i]

Originally Posted by bradsm87

Bingo





It is CILC. It's a clever design feature of the DME. It opens the wastegates during steady state driving to make individual cylinder AFR measurements and adjust accordingly so that all cylinders have the same AFR. Our piezo injectors aren't all made equal and they don't all age equally. They need a lot of DME smarts to keep them performing correctly.

What you are saying makes sense, but how do you know about the clever design of the DME? My injectors aren't even a year old, so now i'm really confused.

I'm finding this issue so annoying that I don't even want to install downpipes on my car because the sound would be too loud and obnoxious. Which sucks, because I hear downpipes is a big improvement on our cars.

[bradsm87]

Originally Posted by Joe_135i

What you are saying makes sense, but how do you know about the clever design of the DME? My injectors aren't even a year old, so now i'm really confused.

I'm finding this issue so annoying that I don't even want to install downpipes on my car because the sound would be too loud and obnoxious. Which sucks, because I hear downpipes is a big improvement on our cars.

It does it regularly all the time, not just when the injectors are old. I've seen the DME tables relating to CILC in the WinOLS file for MSD80.

Downpipes add performance. Exhaust system doesn't. Sounds like the loud and obnoxious issue lies with your exhaust. Catless Downpipes + stock exhaust FTW!

[Joe_435i]

Originally Posted by bradsm87

It does it regularly all the time, not just when the injectors are old. I've seen the DME tables relating to CILC in the WinOLS file for MSD80.

Downpipes add performance. Exhaust system doesn't. Sounds like the loud and obnoxious issue lies with your exhaust. Catless Downpipes + stock exhaust FTW!

My exhaust only gets obnoxiously loud when the WGDC drops to 0%.

[bradsm87]

Originally Posted by Joe_135i

My exhaust only gets obnoxiously loud when the WGDC drops to 0%.

There are lots of situations where the wastegate is open during normal operation. If an exhaust is obnoxiously load when WGDC is 0% with stock downpipes, then it's an obnoxiously loud exhaust.

[madmantwo]

Originally Posted by bradsm87

There are lots of situations where the wastegate is open during normal operation. If an exhaust is obnoxiously load when WGDC is 0% with stock downpipes, then it's an obnoxiously loud exhaust.

Idk about that, my fully catless, resonated PE isn't that loud but when the wastegates are open it sounds extremely loud and terrible

[808AWD325xi]

You can log when the cylinder selective Lambda control demands opening of the wastegates with these boolean PIDs:

0x5BB8 Wastegate 1
0x5BB9 Wastegate 2

If you found this information useful, please click on the Appreciate button at the bottom of this post.

[Joe_435i]

Originally Posted by madmantwo

Idk about that, my fully catless, resonated PE isn't that loud but when the wastegates are open it sounds extremely loud and terrible

Agreed. When you had your turbos replaced did you talk to BMW about this issue at all? I find it very hard to believe this is normal for our cars.

[ferocity02]

Originally Posted by bradsm87

There are lots of situations where the wastegate is open during normal operation.

Care you shed some light on this? To my knowledge, no one has been able to explain why my WGDC drops to 0% at seemingly random times, mostly while cruising on the highway, but also sometimes (although rarely) in stop and go traffic.

One person on BB mentioned it was the DME doing a check on the O2 sensors.

[bradsm87]

Originally Posted by ferocity02

Care you shed some light on this? To my knowledge, no one has been able to explain why my WGDC drops to 0% at seemingly random times, mostly while cruising on the highway, but also sometimes (although rarely) in stop and go traffic.

One person on BB mentioned it was the DME doing a check on the O2 sensors.

It's cylinder individual lambda control, a normal check that the DME does. It's not a problem. It's a feature.

[Joe_435i]

Tonight, I ran a test on the freeway when the car was cold. Climbed a long steady hill and WGDC dropped to 0% as it usually does. Okay, maybe this is part of the warm up cycle as some have mentioned in previous posts. Later, after the car was fully warmed up after 30 mins of driving, I attempted the same long and gradual hill which STILL resulted in my WGDC dropping to 0%. Concluding, that maybe, this is NOT part of the warm up cycle.

[bradsm87]

Originally Posted by Joe_135i

Tonight, I ran a test on the freeway when the car was cold. Climbed a long steady hill and WGDC dropped to 0% as it usually does. Okay, maybe this is part of the warm up cycle as some have mentioned in previous posts. Later, after the car was fully warmed up after 30 mins of driving, I attempted the same long and gradual hill which STILL resulted in my WGDC dropping to 0%. Concluding this, in fact, is NOT part of the warm up cycle.

It's probably just the right incline to get you to the right load that uses 0% WGDC. There are a large amount of normal conditions that result in 0% WGDC being used.

[Joe_435i]

Originally Posted by b1mmr

Hmm.. Mine seems fine at temp. It could be the wg but it could also be the solenoids as suggested by others.

And YEEESS.. I love my muffler delete but the open wg gets brutal at times and conversations put on pause without question. :

Did the "wastegate rattle fix option" on your MHD help this issue at all?

[b1mmr]

Originally Posted by Joe_135i

Did the "wastegate rattle fix option" on your MHD help this issue at all?

Never really tried that honestly and the wg thing is temperamental.. I believe it happened to me mainly when leaving work and I would hop on the interstate immediately in freezing Temps.. Which is somewhat understandable