6MT Post Shift Bog ?

BQTuning · 10-07-2015, 04:45 PM

In the beginning of the year I picked up a 6MT N54 Z4 for a project build . Due to the limited time between two jobs and my eyes being buried into ATR, lack of sleep, and sending maps out to customers all over the world, I have had little time for R&D tuning to see how much more I can get out of COBB ATR in manipulating the DME before even touching TunerPro for anything which I just don't like to use.

After dragging the build for so long and with the help of Ken @ WedgePerformance I was finally able to get the Z4 FBO status, the next thing we are waiting on are for the new Hexon turbos to go in when they become available.

I decided to work on the 6MT post shift bogs that have plagued a lot of N54 6MT cars and was able to tune it on COBB's ATR meaning I did not need any new discoverable tables to accomplish this. The shifting and power response is to the point now it almost feels like my 335is DCT just slower of course, hehehe. I have not yet swapped to my short shifter yet, still on the stock shifter and no NLS. Below is a log of a run I did at the Palm Beach International Raceway on 10/3 during a roll racing event. It was against a 2013 MT Z06 C6 from a 40 roll

http://datazap.me/u/buraq/pbir-roll-...2&zoom=269-474

Sered · 10-07-2015, 05:03 PM

Looks like you're shifting at 6k.

BQTuning · 10-07-2015, 05:29 PM

Quote:

Originally Posted by Sered

Looks like you're shifting at 6k.

I'm on stock turbos in a roll race, I got no business going north of 6k RPMs. ON upgrade turbos then yes that will be territory to play in

JasW · 10-07-2015, 06:46 PM

This is the Clutch Masters Twin Disc?

BQTuning · 10-07-2015, 10:15 PM

Quote:

Originally Posted by JasW

This is the Clutch Masters Twin Disc?

Yes, the FX850 twin disk clutch

JasW · 10-08-2015, 07:31 AM

Quote:

Originally Posted by BuraQ

Yes, the FX850 twin disk clutch

Ken had mentioned you had it -- I ask b/c the factory clutch on my IS started acting up when I pushed hard, possibly a result of not being able to handle the power I'm putting out. It's being replaced under warranty with a new IS factory clutch as we speak, so that should tell me for sure. If so, the twin disc clutch goes on the wish list.

jtswole · 10-08-2015, 07:59 AM

So what did you change in the tune/tables?

BQTuning · 10-08-2015, 01:01 PM

Quote:

Originally Posted by JasW

Ken had mentioned you had it -- I ask b/c the factory clutch on my IS started acting up when I pushed hard, possibly a result of not being able to handle the power I'm putting out. It's being replaced under warranty with a new IS factory clutch as we speak, so that should tell me for sure. If so, the twin disc clutch goes on the wish list.

Just keep in mind going with a twin disk and SMFW has its trade off. You don't have to worry about your clutch slipping, just the chatter which can be unbearable at times especially during the breakin period. If you stick with a DMFW well then you don't have to worry about it and there will be some compromise on power.

Clutchmasters has two flavors of the FX850 for our cars. The version I have is for hardcore abuse that's long lasting and they have another version that's a fully organic street twin disk which doesn't last long if you're always going to be abusive on it. It will be more ideal for DD / street race applications while sticking with a DMFW; but you will have to get the CM DMFW.

BQTuning · 10-08-2015, 01:22 PM

Quote:

Originally Posted by jtswole

So what did you change in the tune/tables?

There were multiple tables that were manipulated to get it right although its not exactly the answer you were looking for as I would have a lot of irate customers if I was just to disclose that information in public.

Im also looking to testing it on a local ST setup that has JB4+BEF which is suffering from a lot of post shift bog. So this would be getting involved with the backend flash (BEF). To make it clear I am not getting involved with JB4 tuning, just the manipulation of the BEF and then the primary tuner takes over with dialing in the JB4. I am only considering this cause the car is 6MT and the owner and primary tuner are close friends. If it wasn't 6MT I wouldn't even touch it regardless.

3000GT MR · 10-08-2015, 03:35 PM

The real post shift bog is made up of a lot of tables (8-10 iirc) most of which are switches and timers. There is also 4 types of bog which some tuners have classified. These tables seem to tend to all of them and their behaviors. Flat line timing post shift is only a fraction of what is involved. I would have to say anything outside of these tables is going to be a tuning work around and band-aid fix.

10-07-2015, 04:45 PM	#1
BQTuning Banned 475 Rep 4,392 Posts Drives: 2012 Z4 sDrive35i M Sport 6MT Join Date: Nov 2010 Location: bq@bqtuning.com iTrader: (0)	6MT Post Shift Bog ? In the beginning of the year I picked up a 6MT N54 Z4 for a project build . Due to the limited time between two jobs and my eyes being buried into ATR, lack of sleep, and sending maps out to customers all over the world, I have had little time for R&D tuning to see how much more I can get out of COBB ATR in manipulating the DME before even touching TunerPro for anything which I just don't like to use. After dragging the build for so long and with the help of Ken @ WedgePerformance I was finally able to get the Z4 FBO status, the next thing we are waiting on are for the new Hexon turbos to go in when they become available. I decided to work on the 6MT post shift bogs that have plagued a lot of N54 6MT cars and was able to tune it on COBB's ATR meaning I did not need any new discoverable tables to accomplish this. The shifting and power response is to the point now it almost feels like my 335is DCT just slower of course, hehehe. I have not yet swapped to my short shifter yet, still on the stock shifter and no NLS. Below is a log of a run I did at the Palm Beach International Raceway on 10/3 during a roll racing event. It was against a 2013 MT Z06 C6 from a 40 roll http://datazap.me/u/buraq/pbir-roll-...2&zoom=269-474 Last edited by BQTuning; 10-07-2015 at 10:24 PM..
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10-07-2015, 05:03 PM	#2
Sered Major 148 Rep 1,201 Posts Drives: 08 E90 335i Join Date: Apr 2012 Location: Melbourne, FL iTrader: (3)	Looks like you're shifting at 6k. __________________ '08 E90 w/ just boltons '09 Z4 sDrive35i w/ just boltons
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10-07-2015, 06:46 PM	#4
JasW Captain 255 Rep 554 Posts Drives: 2013 335is E93 6MT Join Date: Jul 2015 Location: South Florida iTrader: (0) Garage List 2013 BMW 335is E93 [8.00]	This is the Clutch Masters Twin Disc? __________________ 2013 335is E93 6MT \| LeMans Blue/Saddle Brown BQ Tuning MHD E60 flash \| Cobb catted DPs \| ETS 5" FMIC \| BMS DCI \| Fuel-It Stage 2 LPFP \| MMP inlets/outlets \| Forge DVs \| N20 TMAP sensor Vibrant 1790 resonators/mid-cat delete \| MPI CP \| Spec Stage 3+ clutch and steel SMFW \| Wavetrac LSD \| M3 rear subframe and diff bushings
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10-08-2015, 07:59 AM	#7
jtswole First Lieutenant 42 Rep 380 Posts Drives: 335i Join Date: Mar 2014 Location: FL iTrader: (1)	So what did you change in the tune/tables?
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10-08-2015, 03:35 PM	#10
3000GT MR Major 267 Rep 1,392 Posts Drives: 09 335i/3000gt vr4 Join Date: Jun 2012 Location: Sav GA iTrader: (6)	The real post shift bog is made up of a lot of tables (8-10 iirc) most of which are switches and timers. There is also 4 types of bog which some tuners have classified. These tables seem to tend to all of them and their behaviors. Flat line timing post shift is only a fraction of what is involved. I would have to say anything outside of these tables is going to be a tuning work around and band-aid fix. __________________ Have a single turbo and/or tired of burning up O2 sensors? Ask me about the new ADV O2 sensor retro kits! 335i 2010 e92 M-sport Mods: VM Top mount 6466, Aquamist HSF4 w/custom direct port. VRSF IC + Exhaust 335i 2009 e90 665RWHP VFF900 ST RIP .
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