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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > COBB AP on N55 - PROs and (many) CONs



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      06-05-2014, 02:48 AM   #23
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Quote:
Originally Posted by Subaru335i View Post
I just realized you were saying the problem is limited to DCT cars in which case I cannot comment. I have 6MT.
AFR Problem seems to be limited to DCTs, correct. Thank you for your Logs, though. Now it's obvious that it's related to the tranny .

And by the way:
It's not only me having these problems. I would never ever open such a Thread if these were only my problems. Everyone I know of (German cars, DCT, N55) has these problems.
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      06-05-2014, 06:14 AM   #24
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I can confirm that.
I have exactly the same issues with my n55 DCT
I hope cobb will resolve this problems soon...

http://datazap.me/u/santos/ptf-v8-lo...5&zoom=143-251
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Last edited by Santos-ZH; 06-06-2014 at 05:52 PM.
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      06-05-2014, 06:19 AM   #25
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Quote:
Originally Posted by 335iFFM View Post
AFR Problem seems to be limited to DCTs, correct. Thank you for your Logs, though. Now it's obvious that it's related to the tranny .

And by the way:
It's not only me having these problems. I would never ever open such a Thread if these were only my problems. Everyone I know of (German cars, DCT, N55) has these problems.
+1 It is a general COBB N55 DCT problem and it looks we start even to get some evidence, as everybody over here is reporting the same issue!
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      06-05-2014, 09:21 AM   #26
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Here is a log that I took running 93 octane and Stage 1 Aggressive. This is the first log that I took so I'm not sure if I did it correctly but I don't see any spikes in my AFR like your logs. I am now running 30% e85 so I will need to log again soon.



http://www.datazap.me/u/johnny-boost...og=0&data=3-13
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      06-05-2014, 09:46 AM   #27
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Originally Posted by Johnny Boost View Post
Here is a log that I took running 93 octane and Stage 1 Aggressive. This is the first log that I took so I'm not sure if I did it correctly but I don't see any spikes in my AFR like your logs. I am now running 30% e85 so I will need to log again soon.



http://www.datazap.me/u/johnny-boost...og=0&data=3-13
You have the same issue with AFR (it even drops as low as 10.0 !!! after gear shift).

It's not as obvious from your graph since the scale is not appropriate for AFR values.
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      06-05-2014, 09:54 AM   #28
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Quote:
Originally Posted by FireBlade View Post
You have the same issue with AFR (it even drops as low as 10.0 !!! after gear shift).

It's not as obvious from your graph since the scale is not appropriate for AFR values.
I'm not seeing that but I'm no expert. It looks like my AFR dropped into the 10s while at 6k+ RPM but when I shifted it actually increased back to the 11s at low RPMs. Whereas in the OPs log, it drops into 10s AFTER he shifted. Again I could be incorrect but there seems to be a difference. Either way it looks like I need a pro tune.
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      06-05-2014, 10:20 AM   #29
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Quote:
Originally Posted by Johnny Boost View Post
Here is a log that I took running 93 octane and Stage 1 Aggressive. This is the first log that I took so I'm not sure if I did it correctly but I don't see any spikes in my AFR like your logs. I am now running 30% e85 so I will need to log again soon.



http://www.datazap.me/u/johnny-boost...og=0&data=3-13
My OTS map did look similiar, you have throttle closures... Beside your shift doesnt look like a DCT shift... To evaluate the AFR post shift, you souldnt atleast have a TC during the process.
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      06-05-2014, 10:27 AM   #30
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Quote:
Originally Posted by Anatomius View Post
My OTS map did look similiar, you have throttle closures... Beside your shift doesnt look like a DCT shift... To evaluate the AFR post shift, you souldnt atleast have a TC during the process.
Were you able to resolve your throttle closures? I will need to take logs again with this 30% e85 and see if the problem persists.
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      06-05-2014, 10:36 AM   #31
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To fix the throttle closures you need to download ATR and fix the WGDC(Base) table. There is a procedure that Cobb can help you with if you want to try.
Or you can have a protuner take care of it if changing your map is out of your comfort zone.
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      06-05-2014, 10:40 AM   #32
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Quote:
Originally Posted by Subaru335i View Post
To fix the throttle closures you need to download ATR and fix the WGDC(Base) table. There is a procedure that Cobb can help you with if you want to try.
Or you can have a protuner take care of it if changing your map is out of your comfort zone.
Thank you
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      06-05-2014, 11:03 AM   #33
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Yes, the tc can be fixed easily... Sorry im actually focused on the AFR post Shift Problem... If you have a dct Thats the next, what has to be solved...
Please Provide also your log, once the tc are fixed...
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      06-05-2014, 12:19 PM   #34
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Do you guys have logs from the OEM ecu map to see if it gets the rich AFR after shifting with the DCT?
This is very interesting.
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      06-05-2014, 12:29 PM   #35
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I believe in the US the only way to get the DCT was to get the 335is. The standard 335i did not have the DCT option, just the normal automatic gearbox with paddle shifters.
Is that different in Europe? Maybe this is the reason the Cobb 335i maps are behaving strangely on your DCT equipped cars? Because Cobb does not have access to a 335i with DCT as they do not exist here?
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      06-05-2014, 03:35 PM   #36
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dont know if im experiencing it? im n55 DCT. few logs attached - two in 3rd gear up to 6900 rpm. one log freeway normal driving.



http://datazap.me/u/jamesey271975/bm...-9-10-11-12-13

http://datazap.me/u/jamesey271975/bm...-9-10-11-12-13

http://datazap.me/u/jamesey271975/bm...ata=1-2-3-4-13
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Last edited by jamesey271975; 06-05-2014 at 03:58 PM.
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      06-05-2014, 04:02 PM   #37
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Quote:
Originally Posted by jamesey271975
dont know if im experiencing it? im n55 DCT. few logs attached - 3rd gear up to 6900 rpm



http://<a href="http://<a href="http...-12-13</a></a>

http://<a href="http://<a href="http...-12-13</a></a>
Are you sure that you have dct? Your profile says you have the Alpina transmission flash.
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      06-05-2014, 04:10 PM   #38
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Quote:
Originally Posted by Subaru335i View Post
I believe in the US the only way to get the DCT was to get the 335is. The standard 335i did not have the DCT option, just the normal automatic gearbox with paddle shifters.
Is that different in Europe? Maybe this is the reason the Cobb 335i maps are behaving strangely on your DCT equipped cars? Because Cobb does not have access to a 335i with DCT as they do not exist here?
Well in Germany the 335i with N55 engine (non X-Drive!) was only available as 6MT or 7DCT while the X-Drive was only available as 6MT or 6AT.

Quote:
Originally Posted by jamesey271975 View Post
dont know if im experiencing it? im n55 DCT. ...
Sure you got an "xi" with "DCT"?


Anyways, today I received a reply from Cobb regarding my logs, especially AFR values:

Quote:
From the look of your logs your car is extremely happy and is running very safely.
The richness at shift is part of the logic of the DME and is utilized to keep the car safe. It is somthing that we may be able to address in the future. However, currently it is something that BMW likes so we are keeping it in for the time being.
I know this is something our engineers are wanting to look into. We hope we can address some of your concerns in the future.
Unfortunately no word regarding the throttle closures I was inquiring about.

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      06-05-2014, 04:16 PM   #39
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Quote:
Originally Posted by jamesey271975 View Post
dont know if im experiencing it? im n55 DCT. few logs attached - two in 3rd gear up to 6900 rpm. one log freeway normal driving.



http://datazap.me/u/jamesey271975/bm...-9-10-11-12-13

http://datazap.me/u/jamesey271975/bm...-9-10-11-12-13

http://datazap.me/u/jamesey271975/bm...ata=1-2-3-4-13
I don't think you have the DCT...you must have the 6AT steptronic
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      06-05-2014, 04:20 PM   #40
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Quote:
Originally Posted by Subaru335i View Post
I don't think you have the DCT...you must have the 6AT steptronic
ah right, how can i tell? its auto with paddle shifters
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      06-05-2014, 04:22 PM   #41
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Quote:
Originally Posted by FireBlade View Post
Well in Germany the 335i with N55 engine (non X-Drive!) was only available as 6MT or 7DCT while the X-Drive was only available as 6MT or 6AT.
Yeah that is different than the offering in the US. In the E9x we had only 6mt or 6at for both rwd an xdrive.
The new F30 N55's got either the 6mt or the 8at.
The only way to get the DCT here is with the 335is or the 135i and pay for the option.
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      06-05-2014, 04:24 PM   #42
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Quote:
Originally Posted by Subaru335i View Post
Yeah that is different than the offering in the US. In the E9x we had only 6mt or 6at for both rwd an xdrive.
The new F30 N55's got either the 6mt or the 8at.
The only way to get the DCT here is with the 335is or the 135i and pay for the option.
how do those logs look by the way. the Cobb guys said there was no knock but im clueless!
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      06-05-2014, 04:28 PM   #43
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ah right, how can i tell? its auto with paddle shifters
This is how the DKG (DCT) shift lever looks like:



Also, DKG has 7 gears, opposed to 6 of the normal AT tranny.
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      06-05-2014, 07:20 PM   #44
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I've had my fair share of Cobb not having great communication and not even knowing about their own R&D endeavors. For the longest time they told me they would be able to support my DME (2013 335i) and then a year later they told me sorry there isn't going to be any more effort to develop. great. thanks.
Thank BMW for encrypting the DME.
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