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02-21-2018, 09:29 AM | #1 |
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Coding out DBC - dynamic brake assist
Not sure if this has been covered here before but perhaps this will be of use to some.
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/insigh..._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.
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MC IB, CSL intake, Schrick 288/280 cams, SS race bbox, RPI, AP f&r w/RSL-29, Apex ARC-8, A048, KW CS, Turner arms & RTAB limiters, VT engine mounts, Rogue pulleys & RSMs, Tillett B6s, custom half cage, UUC ssk, M5 knob, oem strutbrace
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02-23-2018, 06:07 PM | #2 |
My other car is on Mars
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Sounds like this eliminates what I call "hyper-brakes".
When I come off the throttle fast the brake sensitivity goes up by an order of magnitude. Normally I have about 1/2-3/4" of pedal travel and then smooth braking. In "hyper-brakes" the pedal goes about 1/4" and the brakes come on hard.
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02-23-2018, 09:59 PM | #3 |
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This explains a lot.
There were times in this situation that the brakes drove me crazy they were so touchy.
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02-24-2018, 07:00 AM | #4 | |
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Quote:
I can't wait to try it out on track in 2 weeks time.
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MC IB, CSL intake, Schrick 288/280 cams, SS race bbox, RPI, AP f&r w/RSL-29, Apex ARC-8, A048, KW CS, Turner arms & RTAB limiters, VT engine mounts, Rogue pulleys & RSMs, Tillett B6s, custom half cage, UUC ssk, M5 knob, oem strutbrace
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02-24-2018, 11:49 AM | #5 |
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Interesting!
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2006 Z4MC - #LL93158
SS Race Cans, RE X Pipe, DKF Sec 1, Fabspeed Headers, OE STB, AS Shifter, Dave Z CDV, GC Coil Overs, Stoptech lines, Hawk DTC Pads, RE Clutch Stop, RE Transmission Mounts, Vibra-Technics Engine Mounts, Poly FCAB & RTAB, LeatherZ M Shift Boot, Tekarbon Rear Spoiler, CF Grills, Advan RS DGM |
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