Coding out Dynamic Brake Control (DBC)

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TomK
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Coding out Dynamic Brake Control (DBC)

Post by TomK » Wed Feb 21, 2018 3:43 pm

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.
MC IB, CSL box, Schrick 288/280 cams, SS race bbox, APs, RS-29s, Apex ARC-8, A048, KW ClubSport, Turner arms & RTAB limiters, Vibratec mounts, Rogue pulleys & RSMs, Tillett B6 seats, UUC ssk, custom half cage

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Coding out Dynamic Brake Control (DBC)

Post by ph001 » Wed Feb 21, 2018 5:08 pm

Nice work :thumbsup:

I'm the same as you on DBC. The thing I seek most on brakes is consistency!
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Coding out Dynamic Brake Control (DBC)

Post by VRSteve » Wed Feb 21, 2018 6:11 pm

ph001 wrote:
Wed Feb 21, 2018 5:08 pm
Nice work :thumbsup:

I'm the same as you on DBC. The thing I seek most on brakes is consistency!
Stopping first
Consistency second :D
///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|
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ph001
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Coding out Dynamic Brake Control (DBC)

Post by ph001 » Wed Feb 21, 2018 6:37 pm

:rofl: Yeh, I suppose if they 'consistently' don't stop they are not much use!
2007 E85 Z4 3.0Si manual :driving:
19" CSL's | Eibach Springs | Aeroskirts | Z4M front bumper | Clear brake light | ZHP | RCH+| Stubby

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MrPT
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Coding out Dynamic Brake Control (DBC)

Post by MrPT » Wed Feb 21, 2018 7:58 pm

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.
2008 Z4MC: SG/Imola | sub-flimper spec | +OEM CSLs | +KWv3 | +TMS RTABLs | +VT mounts | +Eventuri | +OEM strut brace | +DB9 front BBK | +cruise - probably looks a bit like your one
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Coding out Dynamic Brake Control (DBC)

Post by Scooba_Steve » Wed Feb 21, 2018 8:57 pm

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.

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TomK
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Coding out Dynamic Brake Control (DBC)

Post by TomK » Wed Feb 21, 2018 11:09 pm

MrPT wrote:
Wed Feb 21, 2018 7:58 pm
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.
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 box, Schrick 288/280 cams, SS race bbox, APs, RS-29s, Apex ARC-8, A048, KW ClubSport, Turner arms & RTAB limiters, Vibratec mounts, Rogue pulleys & RSMs, Tillett B6 seats, UUC ssk, custom half cage

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Coding out Dynamic Brake Control (DBC)

Post by Vanne » Thu Feb 22, 2018 9:46 am

Subbed for report after Donnington.. :thumbsup:
2007 EuroSpec Z4///MC Carma FF. DMK USSk. CDV X. RPi. CSL 19". Apex. APR Aero. CSL intake. Epic Alpha-N. KW Cs. 288/280. SS S1.Varis. Me STB. Brembo GT. Tillett. RE Xpipe. JB.
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Coding out Dynamic Brake Control (DBC)

Post by Fishy Dave » Thu Feb 22, 2018 9:22 pm

Top work sir, look forward to seeing the result. :)
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Coding out Dynamic Brake Control (DBC)

Post by bradz » Thu Feb 22, 2018 9:45 pm

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?
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Coding out Dynamic Brake Control (DBC)

Post by zmaster007 » Fri Feb 23, 2018 8:40 pm

bradz wrote:
Thu Feb 22, 2018 9:45 pm
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?
I can trigger mine if you come off the accelerator quickly and touch the brake, the DBC primes the system for an emergency stop
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Coding out Dynamic Brake Control (DBC)

Post by RedUn » Fri Feb 23, 2018 11:54 pm

Interesting :thumbsup: what are you using for coding? I really need to pull my finger out in the coding front!
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Coding out Dynamic Brake Control (DBC)

Post by BMWZ4MC » Sat Feb 24, 2018 12:53 am

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.
RedUn wrote:
Fri Feb 23, 2018 11:54 pm
Interesting :thumbsup: what are you using for coding? I really need to pull my finger out in the coding front!
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...
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Coding out Dynamic Brake Control (DBC)

Post by TomK » Sat Feb 24, 2018 11:19 am

BMWZ4MC wrote:
Sat Feb 24, 2018 12:53 am
RedUn wrote:
Fri Feb 23, 2018 11:54 pm
Interesting :thumbsup: what are you using for coding? I really need to pull my finger out in the coding front!
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...
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 box, Schrick 288/280 cams, SS race bbox, APs, RS-29s, Apex ARC-8, A048, KW ClubSport, Turner arms & RTAB limiters, Vibratec mounts, Rogue pulleys & RSMs, Tillett B6 seats, UUC ssk, custom half cage

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Coding out Dynamic Brake Control (DBC)

Post by BMWZ4MC » Sat Feb 24, 2018 12:30 pm

Cheers Tom :thumbsup: 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 :driving:

I suppose it’s good to know where it is though, in case one day I become a vegetarian :P :D
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