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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > DCT slipping with lots of Torque? Nope!



View Poll Results: Does your DCT slip and/or Have Problems with 400tq+ ?
I have a DCT with 400tq+ and my clutch slips (I HAVE abused my transmission) 17 18.09%
I have a DCT with 400tq+ and my clutch slips (I have NOT abused my transmission) 18 19.15%
I have a DCT with 400tq+ and NO problems with my transmission (I HAVE abused my transmission) 29 30.85%
I have a DCT with 400tq+ and NO problems with my transmission (I have NOT abused my transmission) 30 31.91%
Voters: 94. You may not vote on this poll

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      10-04-2014, 12:52 AM   #89
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Same as hutch mine will slip in 5th 3k roll on. Want to see if I can get a Cobb backend for my early production 12' hoping that will cure the problem
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      10-04-2014, 03:42 PM   #90
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Quote:
Originally Posted by Cloud9blue View Post
any wheel spins? if not, with the erratic rpms that you got on that graph, the DCT is definitely slipping.
255 nitto nt05s here, hardly any wheel spin at all. DCS fully off too
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      10-04-2014, 03:44 PM   #91
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Ok, so just to rule out any other variable I went out and ran several pulls on different maps. I also splashed in 2 gal of 93 to lighten the e% in an effort to lower tq slightly.

After changing the fuel mixture, and being that I havent ran map 5 in some time, I wanted to try map 5 to see if it could adjust throttle body, octane and other settings that may have changed with map6.

First pull felt great and logged great as well. I was excited at first but also knew that map 5 is a learning map so I wanted to another pull to dial in the map. As expected, as the increase in boost prompted throttle closing and flat line in rpm and felt like the car was slipping again

Newguy and I chatted for a bit and he suggested map 2 as a try. I ran map 2 and the car hooked up like its supposed to and the log looks great.

Concluding that the n55 dct with higher power maps and PURE turbo is enough to make the DCT slip (also makes it get worse over time) without the backend flash. This really sucks for the 2012 + n55 DCT guys as we basically can only get min power gains with all the money in fbo and a stg1 turbo without putting the tranny at risk. I have a couple of ideas how to work around this but i need to make a couple of calls to see if it is even an option.

1. map 5 - 4th gear pull - first pull/learning pull on map 5
2. map 5 adopted - 3rd to 4th - maps learns, raises boost, causes slip
3. map 2 - altho the weakest map, the pure does allow the map to hold ~14 all the way to 6500 which is still faster than stock turbo but we are leaving a lot of power on the table to say the least.
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      10-04-2014, 11:49 PM   #92
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This is pretty frustrating to say the least....I hope someone actually steps up soon or the n55 dct is going to be the laughing stock of BMWs. Terry has the means to dig deeper on this but doesn't seem like he's willing. Maybe Cobb will come through
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      10-05-2014, 10:22 AM   #93
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Quote:
Originally Posted by Newguy123 View Post
This is pretty frustrating to say the least....I hope someone actually steps up soon or the n55 dct is going to be the laughing stock of BMWs. Terry has the means to dig deeper on this but doesn't seem like he's willing. Maybe Cobb will come through
Ditch the Piggyback get a COBB AP, problem solved, unless COBB does support your version ROM. The more you ride the slippage worse it will get to the point when you do get the COBB AP it wont matter anymore.
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      10-05-2014, 11:14 AM   #94
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Quote:
Originally Posted by BuraQ View Post
Ditch the Piggyback get a COBB AP, problem solved, unless COBB does support your version ROM. The more you ride the slippage worse it will get to the point when you do get the COBB AP it wont matter anymore.
Already tried went to the Cobb SoCal and had them try and hook up to my car (early production 2012) nope they said they can't do anything for me and don't plan on having a soloution
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      10-05-2014, 03:22 PM   #95
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Created a new map 6 with peak boost of 15psi 5k tapering to 13psi 6500k. Also brought my auto shift boost back down to 50.

Car seems to handle this map well. Talked to multiple tuners last night and all of them say the tcu does not report back to the dme. If this TRULY is the case, then what in the world would be causing the throttle to close? It very well may not even be the transmission? If the throttle is closing, the power would decrease and this would also create a flat spot in RPMs. I just dont get it. If the TCU did report back to the dme then this totally makes sense but if it does NOT then that, to me, indicates that something else is going on.


OH AND also, the issue did not become apparently obvious until going to ista 2.53 i-level rom version update. I did this in an attempt to get Cobb to speak with the dme (which still didnt work, go figure). I can post a before ROM log if this would be at all beneficial in the analysis? Just let me know
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      10-05-2014, 06:03 PM   #96
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Turned her back up to 17 tapering to 14. Car overall feels stronger and happier if I roll my pedal into WOT vs pushing it to WOT ASAP.

My plan is to drive her this way over the colder months; I'll likely even back it down to 14/15 peak no need for that power on snow tires in Mn.
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      10-05-2014, 11:04 PM   #97
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Not much help for you but I get zero slipping with my DCT. N55 135i, vargas Stage 2 turbo and PTF Pro tune.
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      10-06-2014, 08:38 AM   #98
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Quote:
Originally Posted by Nugget View Post
Not much help for you but I get zero slipping with my DCT. N55 135i, vargas Stage 2 turbo and PTF Pro tune.
Yup we need a backend flash....
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      10-06-2014, 05:44 PM   #99
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Maybe Some light at the end of the tunnel.

NewGuy talked with Dinan today and sounds like there may be something they can come up with to solve. Not sure if this will be a transmission flash, replacement chip, or require their full stage 4 software tuning - either way, I'd be open to any of the options if they pan out!

I've been searching around more and looked into the Alpina B3 transmission flash. I'm not sure if this is possible (emailed Alex) but if it is I have to assume that it would help?

Quote:
Originally Posted by Alex@Alpine View Post

The Alpina b3 flash has nothing to do with engine tunes, they work great with any engine tune.

The Cobb nor the JB4 do not touch the transmission module.

There is really no downside, this is more in the line of a factory flash.
More to come...
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      10-06-2014, 09:40 PM   #100
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Quote:
Originally Posted by Nugget View Post
Not much help for you but I get zero slipping with my DCT. N55 135i, vargas Stage 2 turbo and PTF Pro tune.
Would you mind posting a recent log? I'd love to see the data for shits and giggles
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      10-07-2014, 01:37 AM   #101
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Quote:
Originally Posted by iuhutch View Post
Maybe Some light at the end of the tunnel.

NewGuy talked with Dinan today and sounds like there may be something they can come up with to solve. Not sure if this will be a transmission flash, replacement chip, or require their full stage 4 software tuning - either way, I'd be open to any of the options if they pan out!

I've been searching around more and looked into the Alpina B3 transmission flash. I'm not sure if this is possible (emailed Alex) but if it is I have to assume that it would help?



More to come...
Alpina flash is for autos not DCT.

Quote:
Originally Posted by iuhutch View Post
Would you mind posting a recent log? I'd love to see the data for shits and giggles
Recent logs don't look too pretty as we are still working on my e50 flash.
It seems it's not as easy to get it working as it is with a JB4 but I'm perservering flash only.
This is from my pump gas map.
http://www.datazap.me/u/nugs/ptf-vtt...19&zoom=58-226
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      10-13-2014, 03:25 AM   #102
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Quote:
Originally Posted by Newguy123 View Post
Yup we need a backend flash....
Hi .... newbie here ...

What is a backend flash ? I am not too clear about this ...
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      10-13-2014, 07:03 AM   #103
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Quote:
Originally Posted by SUPAN View Post
Hi .... newbie here ...

What is a backend flash ? I am not too clear about this ...
Its a software flashed to the car's ECU to supplement the piggyback
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      10-14-2014, 10:49 PM   #104
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Quote:
Originally Posted by BuraQ View Post
Its a software flashed to the car's ECU to supplement the piggyback
Thanks guide but I am on COBB ... doubt I need that.

Cheers!
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      10-15-2014, 12:31 AM   #105
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Quote:
Originally Posted by SUPAN View Post
Thanks guide but I am on COBB ... doubt I need that.

Cheers!
You dont, everything you need for the DCT is in the COBB ATR, and this week hopefully I can set a dyno "TORQUE" record
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      10-15-2014, 01:19 AM   #106
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Quote:
Originally Posted by Nugget View Post
Alpina flash is for autos not DCT.


Recent logs don't look too pretty as we are still working on my e50 flash.
It seems it's not as easy to get it working as it is with a JB4 but I'm perservering flash only.
This is from my pump gas map.
http://www.datazap.me/u/nugs/ptf-vtt...19&zoom=58-226
Hey Nugget,

I've been working with Edwin on my Jb4 + Cobb stacked flash and here is my log with e30 + meth, 3rd gear pull:

http://www.datazap.me/u/ink/aggressi...-29&zoom=15-63
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      10-15-2014, 08:11 AM   #107
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Quote:
Originally Posted by _ink View Post
Hey Nugget,

I've been working with Edwin on my Jb4 + Cobb stacked flash and here is my log with e30 + meth, 3rd gear pull:

http://www.datazap.me/u/ink/aggressi...-29&zoom=15-63
Log looks very good, if you ever get the chance I would like see couple of gear pulls.

In the begining of WOT tappering to 18.7 PSI @ 6000 RPMs tells me by time you hit your 3rd consecutive gear you will be 20 PSI straight across with no tapper ?

Also I just went back and took a look at your pwm, hes keeping that tighten down; I asume your DCI modded also. So I dont see huge torque coming from this to pose a threat to the DCT. I may be wrong unless you have a dyno ?

Last edited by BQTuning; 10-15-2014 at 08:18 AM..
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      10-15-2014, 05:01 PM   #108
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Quote:
Originally Posted by BuraQ
Quote:
Originally Posted by _ink View Post
Hey Nugget,

I've been working with Edwin on my Jb4 + Cobb stacked flash and here is my log with e30 + meth, 3rd gear pull:

http://www.datazap.me/u/ink/aggressi...-29&zoom=15-63
Log looks very good, if you ever get the chance I would like see couple of gear pulls.

In the begining of WOT tappering to 18.7 PSI @ 6000 RPMs tells me by time you hit your 3rd consecutive gear you will be 20 PSI straight across with no tapper ?

Also I just went back and took a look at your pwm, hes keeping that tighten down; I asume your DCI modded also. So I dont see huge torque coming from this to pose a threat to the DCT. I may be wrong unless you have a dyno ?
Thanks, yeah he's done an awesome job with the tune. And has also tried JB4 only, Flash only, and prefers the stack.

I'm across what you have been working on with post shift timing, and we haven't worked on that so will try get some logs for you to have a peek at.

The boost curve that I'm running is because I have RB's, and my intake system is an Injen rep.
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      10-15-2014, 07:23 PM   #109
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Quote:
Originally Posted by _ink View Post
Hey Nugget,

I've been working with Edwin on my Jb4 + Cobb stacked flash and here is my log with e30 + meth, 3rd gear pull:

http://www.datazap.me/u/ink/aggressi...-29&zoom=15-63
Looks like fun to me
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      10-15-2014, 10:47 PM   #110
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Interesting pole 22 out of 51 users have a slipping DCT or have experienced slippage. I wonder how many are stock, tune only and FBO TUNE. Also what tune or piggy you have experienced slippage with
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