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Coding out Dynamic Brake Control (DBC)
- TomK
- Senior Member
- Posts: 2367
- Joined: Fri Jan 25, 2013 11:50 pm
- Location: West London
Coding out Dynamic Brake Control (DBC)
I find the z4m to be a pretty accomplished car on track with some mods however one thing that has always bugged me is the inconsistency that can occur with the brake pedal in certain situations.
It comes as a result of DBC, you can read about how it works here, suffice to say it can be difficult to modulate the brake when coming off the throttle very quickly.
http://www.bmw.com.kh/asia/en/insights/technology/technology_guide/articles/dynamic_brake_control.html?source=index&article=dynamic_brake_control
I've looked around on the web and haven't been able to find any one who has removed it on the Z4M, so I thought I'd have a go myself. Digging around it turns out our ecu is closely related to some of the newer e6/8x models and there in lay the answers.
The function you need to set to not active is BB_RAB found in the MK60 ecu.
That's it A very nice improvement on initial tests, pedal feel consistent I can update in a few weeks after Donnington.
If you wish you can also disable hill start assist which is HSA and also the automatic brake disk dry function for when it is wet by setting TB_BDD to not active.
It comes as a result of DBC, you can read about how it works here, suffice to say it can be difficult to modulate the brake when coming off the throttle very quickly.
http://www.bmw.com.kh/asia/en/insights/technology/technology_guide/articles/dynamic_brake_control.html?source=index&article=dynamic_brake_control
I've looked around on the web and haven't been able to find any one who has removed it on the Z4M, so I thought I'd have a go myself. Digging around it turns out our ecu is closely related to some of the newer e6/8x models and there in lay the answers.
The function you need to set to not active is BB_RAB found in the MK60 ecu.
That's it A very nice improvement on initial tests, pedal feel consistent I can update in a few weeks after Donnington.
If you wish you can also disable hill start assist which is HSA and also the automatic brake disk dry function for when it is wet by setting TB_BDD to not active.
MC[IB], CSL airbox, Schrick 288/280 cams, 4.44FD, UUC SSK, SS race cat back, AP CP9660[F]/5144[R] brakes, Apex ARC-8 with AR-1 or PS5, KW ClubSport 2-way, Turner spherical arms, PMC uniball rtab, VB engine mounts, Rogue pulleys & RSMs, Tillett B6, half cage
- ph001
- Lifer
- Posts: 3870
- Joined: Mon Oct 31, 2016 5:53 pm
- Location: N. Yorkshire.
Coding out Dynamic Brake Control (DBC)
Nice work
I'm the same as you on DBC. The thing I seek most on brakes is consistency!
I'm the same as you on DBC. The thing I seek most on brakes is consistency!
-
- Member
- Posts: 565
- Joined: Sat Aug 08, 2015 9:36 pm
- Location: West Sussex
Coding out Dynamic Brake Control (DBC)
Stopping first
Consistency second
///M|Silver Grey|Black Leather|BT|Nav|DSP|Heated Seats|PDC|Stubby|Turner Limiters|Turner Rear Top Mounts|Bilstein B12|Powerflex ARB Bushes|Powerflex Lollipops|M-Track|
SOLD
SOLD
- ph001
- Lifer
- Posts: 3870
- Joined: Mon Oct 31, 2016 5:53 pm
- Location: N. Yorkshire.
Coding out Dynamic Brake Control (DBC)
Yeh, I suppose if they 'consistently' don't stop they are not much use!
- MrPT
- Lifer
- Posts: 4746
- Joined: Sun Oct 21, 2012 7:44 pm
- Location: Bucks/Oxon
Coding out Dynamic Brake Control (DBC)
Nice work. Given that you've now turned it off, do you think it ever came into play during "spirited" road driving?
I had assumed so, but it's hard to tell because the Z4M brakes are a bit over-servoed.
I had assumed so, but it's hard to tell because the Z4M brakes are a bit over-servoed.
2008 Z4MC: heavy wheels | crap suspension | skittish rear end | wobbly engine | not enough induction noise | underwhelming turn in | inconsistent braking | lardy battery | chubby steering wheel
2006 Z4 2.5si: gone
2006 Z4 2.5si: gone
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- Lifer
- Posts: 5277
- Joined: Wed Feb 19, 2014 3:01 pm
- Location: NW London
Coding out Dynamic Brake Control (DBC)
Good effort, I'd like to know exactly how DBC works though, never seen a tech guide on it.
3.0si Sport: F10 Illuminated ZHP, Retrofit Cruise, OE Stubby, Gaptech RCH+, Kenwood BT73DAB + Handsfree, HIDs, LED Sidelights, OE LED Number Plate Lights, Custom LED strip bootlight.
- TomK
- Senior Member
- Posts: 2367
- Joined: Fri Jan 25, 2013 11:50 pm
- Location: West London
Coding out Dynamic Brake Control (DBC)
No I don't really think it does. It takes extreme inputs to activate the system and if something you did on the road required it you'd probably be better off with it tbh. On track though in certain situations it can be bloody annoying so I'm keen to see how it goes next time out.
MC[IB], CSL airbox, Schrick 288/280 cams, 4.44FD, UUC SSK, SS race cat back, AP CP9660[F]/5144[R] brakes, Apex ARC-8 with AR-1 or PS5, KW ClubSport 2-way, Turner spherical arms, PMC uniball rtab, VB engine mounts, Rogue pulleys & RSMs, Tillett B6, half cage
- Vanne
- Senior Member
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Coding out Dynamic Brake Control (DBC)
Subbed for report after Donnington..
2007 EuroSpec Z4///MC Building/Developing Z4 GT3
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Powered by Severn Tuning
- Fishy Dave
- Member
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- Joined: Sun Jul 05, 2015 8:01 pm
- Location: Wiltshire, England
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Coding out Dynamic Brake Control (DBC)
Top work sir, look forward to seeing the result.
Corvette C6
Mazda RX-8 race car
Now sold: Z4M Roadster, the best all round car I have owned.
Mazda RX-8 race car
Now sold: Z4M Roadster, the best all round car I have owned.
- bradz
- Member
- Posts: 455
- Joined: Thu Jul 11, 2013 6:26 pm
- Location: Bedford
Coding out Dynamic Brake Control (DBC)
I think I had issues with this... I just put it down to a characteristic, what activates it just a hard stomp after WOT?b I triggered it a few times but couldn't always replicate it?
Z4M Coupe, E92 M3, E46 M3 Track car
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- Member
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Coding out Dynamic Brake Control (DBC)
I can trigger mine if you come off the accelerator quickly and touch the brake, the DBC primes the system for an emergency stop
- RedUn
- Senior Member
- Posts: 1108
- Joined: Sat Jun 16, 2012 7:33 pm
- Location: Hertfordshire
Coding out Dynamic Brake Control (DBC)
Interesting what are you using for coding? I really need to pull my finger out in the coding front!
IMOLA Z4///MR
- BMWZ4MC
- Lifer
- Posts: 6346
- Joined: Sun Sep 13, 2009 4:24 pm
- Location: Back in the sunshine
Coding out Dynamic Brake Control (DBC)
It will activate with road driving, simply touching the brake after closing a WOT is enough.
Well done Tom, I hope this works as you suspect.
Well done Tom, I hope this works as you suspect.
Me too, I’ve a code reader but no capacity to alter code at present. I’m very interested in this mod, so it might sway me to invest...
Z4MC - heavily fettled for track use
Lotus Exige - sensible daily driver on the mods slippery slope
Westfield SEiW - in hibernation
Modified RS4 Avant - back in Blighty
S2000 GT - gone
- TomK
- Senior Member
- Posts: 2367
- Joined: Fri Jan 25, 2013 11:50 pm
- Location: West London
Coding out Dynamic Brake Control (DBC)
You'll need ncs expert to code this, available for £20 or so with the cable and various software (ncs/inpa/dis/tis etc). Whilst it can be a bit tricky setting the software up, once you know what you are doing most coding jobs take no more than a couple of mins. This DBC is found in the same module as the 'M'Track' mode previously discussed so you can do both whilst you are there. Lot's of interesting things in that module!
If you need any help with it drop me a line.
MC[IB], CSL airbox, Schrick 288/280 cams, 4.44FD, UUC SSK, SS race cat back, AP CP9660[F]/5144[R] brakes, Apex ARC-8 with AR-1 or PS5, KW ClubSport 2-way, Turner spherical arms, PMC uniball rtab, VB engine mounts, Rogue pulleys & RSMs, Tillett B6, half cage
- BMWZ4MC
- Lifer
- Posts: 6346
- Joined: Sun Sep 13, 2009 4:24 pm
- Location: Back in the sunshine
Coding out Dynamic Brake Control (DBC)
Cheers Tom Any recommendation re which software to choose when purchasing?
I’m not too fussed about M Track Mode, I’m happy with the DSC Off setting
I suppose it’s good to know where it is though, in case one day I become a vegetarian
I’m not too fussed about M Track Mode, I’m happy with the DSC Off setting
I suppose it’s good to know where it is though, in case one day I become a vegetarian
Z4MC - heavily fettled for track use
Lotus Exige - sensible daily driver on the mods slippery slope
Westfield SEiW - in hibernation
Modified RS4 Avant - back in Blighty
S2000 GT - gone