03-08-2021, 03:01 AM | #23 | |
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03-24-2021, 10:49 AM | #24 |
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This seems usafe. But maybe I misunderstand. Ostensibly the car makes up for brake fade by applying more brake than you did with your foot. In other words hiding the brake fade from you?!?! Doesn't this ultimately just give the driver less warning that the brakes are overworked and thus less opportunity to remedy with a cool down lap before the brakes fade beyond the point compensation can be effective and you go full code brown. How did anyone ever think this "feature" was a good idea
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03-24-2021, 06:56 PM | #25 | |
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Secondly, if anyone has access to a CS Racing (long shot 🤷🏻*♂️), they could pull the CAFD files. |
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03-29-2021, 04:55 AM | #26 | |
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03-30-2021, 11:00 AM | #27 | |
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In the linked German forum post, there are two settings that the user recommends removing:
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The former, C_Ffunktion_Bremsbereitschaft_aktiv_I, is the one that I coded out prior to last weekend at COTA—all other things being exactly the same as when I was there in December. I can confirm that this will get rid of the odd variance in pedal pressure that happens on occasion and provided me with consistent pedal feel whether braking while overlapping throttler lighting braking or quickly lifting throttle for hard braking. |
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03-30-2021, 11:47 AM | #28 |
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Would be nice to have CAFD from racing cars like the m4 gt4, but most of them use different abs modules, so there no much to learn. Fading compensation as you can tell is not active on M cars in comparison with Mperformance or non m cars, this is due to them been equipped with better brakes, or at least bigger rotors like the M2-3 and 4, but there are other parameters that you can modify to improve your cars braking feedback, I also have an M2C and my brakes are now much better after the coding, the brake pedal feels firmer, I have to apply a little more of force to achieve desire braking, now I´m able to brake hard without locking-up the tires and abs kicking in. I haven't share as much information in posts but you can PM, will be nice to have more feedback from other forum members.
Last edited by daap1193; 03-30-2021 at 11:53 AM.. |
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09-18-2021, 10:23 AM | #29 | |
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Could you please PM me? I would be interested in some help please. |
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09-19-2021, 07:57 AM | #31 |
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Not sure to understand your question but if you are reffering to the "knock" it makes when you brake driving forward after braking backward (and vice versa), this "issue" is mechanical. It comes from the play the pads have (you can reproduce this effect by hand by moving the pads).
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09-19-2021, 09:42 AM | #32 | |
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That parameter is for "brake preparedness" which I think is the feature that wipes discs when wet. The GT4 coding + front APs is great. Brakes are easy to modulate at the limit.
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09-20-2021, 01:20 AM | #33 | |
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Is it customized to your brake balance setup? |
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09-20-2021, 02:13 AM | #34 | ||
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Like the brake preparedness or emergency brake boost or brake fade compensation. The result is a pedal that feels consistent. I no longer get that weird extra bit of braking sometimes or have the brakes grab differently at the same pedal pressure. Daap1193 did my coding, I think he wanted to offer it as a service so I won't disclose how to do it. If he agrees or has disappeared I can prepare something. I don't think the brake balance needs to be altered. Maybe if you are a semi pro or better driver you can get a bit more out of the car but for track days the balance is good enough. There is a 1 make series here running M2C like M240i's that have APs up front and stock 2 pot brakes in the rear. I spoke to the tuner that altered the brake mapping to suit these cars and he said you don't need to do anything until you run full slicks, then the system can be thrown off and some parameters in the ABS comp need to be altered.
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09-21-2021, 05:44 PM | #35 | |
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The Brake preparedness C_Ffunktion_Bremsbereitschaft_aktiv_I only pre-pressurizes the brake system when the throttle is suddenly released or chopped. There is a video that explains it, but it's essentially to provide a very tall pedal in the event of an emergency stop. |
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10-15-2021, 11:04 AM | #36 |
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I contacted Daap and he coded the brakes for me.
I can 100% recommand to contact him. You need a laptop and an OBD-Ethernet cable, he will do the rest remotely for you. The result of the coding is a more consistent brake pedal (no more unexpected and exaggerated brake assistance) and a better feedback through the pedal. When driving, it translates into more feedback and more confidence in the braking system. 100% recommand! |
10-17-2021, 03:42 PM | #37 |
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I happy to report I had daap1193 code my car with his braking mods and m4gts steering. We are both very hopeful this may resolve the side to side squirming sensation I feel in the car when braking from 150mph to 80 on the limit
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10-17-2021, 03:50 PM | #38 |
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Pretty sure I know the answer but what level of DSC are you running when that would happen?
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10-17-2021, 05:05 PM | #40 | |
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I haven't had the balls to run in DSC off mode on track |
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10-17-2021, 05:58 PM | #41 |
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Ok so every BMW (including the M2s) I have tracked has been a bit squirrely under hard high speed braking with any form of DSC active. DSC off and it is much more stable under heavy braking. Not saying what you had done won't help - just that if you are still seeing it this might be what is going on.
Definitely not saying need to be running DSC off - certainly you do you - but that is one of the big benefits of it being off.
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10-19-2021, 08:44 AM | #42 | |
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Although, I have gained enough experience in the M2C to go full DSC off and see how it goes.
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10-20-2021, 08:25 AM | #43 | |
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10-20-2021, 11:56 AM | #44 | |
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2020 M2 Comp, Sunset Orange/Blk: Orange stitching, DCT, exec pkg, bicolor rims Gone '18 M550i, '16 X4 M40i, '15 M5, '13 X3 35i, '12 335is, '11 X5 50i, '09 Z4 35i, '08 550i, 06 X3, 06 650i, '02 M5, '99 540i |
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