|
|
|
|
|
|
BMW Garage | BMW Meets | Register | Today's Posts | Search |
|
BMW 3-Series (E90 E92) Forum
>
Car reducing power via DSC because "brake disc temperature is too high"
|
|
04-20-2015, 10:44 PM | #1 |
Lieutenant Colonel
1008
Rep 1,563
Posts |
Car reducing power via DSC because "brake disc temperature is too high"
I track my car often and am having a very frustrating problem. After going after it hard (advanced group 30min sessions) the car noticeably loses power. I figured it was an overheating issue but the oil temp rarely goes above 255 since it is a N55. I finally scanned the car for codes with the BMWhat app and found the following:
Fault: :unknown failure / Speed Sensor rear Right / Driving power reduction by DSC command / Brake disc temperature is too high for a short time Code: 5F1C I have stoptechs in the front, but the rears are just stoptech powerslot rotors. How can I prevent this stupid car from cutting my power when I drive hard? This occurs even with DTC and DSC are FULLY OFF (I never track with them on). |
04-20-2015, 10:55 PM | #2 | |
Brigadier General
1233
Rep 3,778
Posts
Drives: '11 328i '19 M6
Join Date: Jan 2012
Location: DFW
|
Quote:
__________________
2011 E90 328i 6MT, BMW Aero, CF hood/boot, PI+CAI+RM+3IM+BPC, SS+CI528+ThermoTec+SS#1+2XBurns, AKG 75D eng/trans, Al/Delrin diff/RS, CM 850, UCP, CAE, AKG DSSR, DiffsOnline 3.91 30/90 LSD+BW cooler, C&R, Setrab, Accusump, AST 3-way+Swift, Aurora PR+BW spherical, Vorshlag CPs, M3 brace+UR bar, ARC-8 18x8.5, 255 R1R, RB/CSL rotors+cooling, 135i calipers, RS29, RT700, Safecraft, OMP HTE-R+804F+QD Superquadro, 6pt cage+FIA, Braille, RT DL1Mk3
|
|
Appreciate
0
|
04-20-2015, 11:31 PM | #4 |
Brigadier General
711
Rep 3,251
Posts |
Does the car actually have a temp sensor in the hub or something? Strange issue indeed.
But you should really consider getting a LSD, especially running at the pace of most advance groups |
Appreciate
0
|
04-20-2015, 11:35 PM | #5 |
Lieutenant Colonel
1008
Rep 1,563
Posts |
Interesting, that kind of makes sense. I was originally thinking it was logical for the rear sensor to give the error because the fronts are cooler since the fronts have a full BBK, but I found a document from BMW saying that the rotor temp isn't real, but rather calculated based on brake application force and ground speed. If the temperature is calculated then technically the car doesn't know the fronts are running cooler.
I was running at NCM and my differential was seriously pissed...noticed the need for a real LSD far more than at other tracks I have been to due to the nature of the turns. The car is xdrive, but 80% rear biased. So it makes sense that the car would think that the rear rotors are higher temp if it is over-using the rear pads, and I have noticed accelerated rear pad wear. |
Appreciate
0
|
04-21-2015, 11:51 AM | #6 |
Brigadier General
1254
Rep 4,088
Posts |
No i think the DME estimates it indirectly since it knows how much rear brake is being applied to control differential wheelspin.
|
Appreciate
0
|
04-21-2015, 11:55 AM | #7 | |
Brigadier General
1254
Rep 4,088
Posts |
Quote:
|
|
Appreciate
0
|
04-21-2015, 02:29 PM | #8 |
king of the hills
92
Rep 2,915
Posts
Drives: 2011 M3 w/ESS55, 2001 540i/6
Join Date: Dec 2006
Location: Arvada, CO
|
Hmm, if its just through the brake sensor then you could just take it out and tie it up out of the way, but if its through the speed sensor that wouldn't be possible.
|
Appreciate
0
|
04-21-2015, 02:45 PM | #9 |
Brigadier General
1254
Rep 4,088
Posts |
It's not through the brake pad sensor - those are more of an on-off switch. There is some soft failure but not enough to measure and then remeasure brake temp.
|
Appreciate
0
|
05-27-2015, 07:55 AM | #10 |
Captain
59
Rep 741
Posts
Drives: E87 130i
Join Date: Jan 2012
Location: Melbourne, AU
|
Track car? code it off.
|
Appreciate
0
|
05-27-2015, 08:48 AM | #11 |
Private First Class
7
Rep 112
Posts
Drives: E90 328i m-sport 6MT
Join Date: Sep 2013
Location: St Pete, FL
|
|
Appreciate
0
|
05-28-2015, 07:36 AM | #12 |
Captain
59
Rep 741
Posts
Drives: E87 130i
Join Date: Jan 2012
Location: Melbourne, AU
|
|
Appreciate
0
|
06-21-2015, 10:28 AM | #13 |
Lieutenant Colonel
1008
Rep 1,563
Posts |
I really need to know how to disable this. I have googled and can't find anything. I am at Watkins Glen right now and it is ruining my weekend, even with a mechanical LSD installed. Can you PM me if not comfortable sharing publicly?
|
Appreciate
0
|
06-21-2015, 09:01 PM | #14 |
Captain
59
Rep 741
Posts
Drives: E87 130i
Join Date: Jan 2012
Location: Melbourne, AU
|
|
Appreciate
0
|
08-14-2015, 06:10 PM | #16 | |
Lieutenant Colonel
1008
Rep 1,563
Posts |
What most people don't realize is that this is killing your car's performance on track. IT won't throw a SES light or any codes, but if you actually scan the DSC module you will see that it is cutting your power due to braking temps. Even if you have a LSD! The next step forwards for the 335i platform is figuring out how to code this off.
Quote:
|
|
Appreciate
0
|
08-17-2015, 07:34 AM | #17 |
Brigadier General
827
Rep 3,856
Posts |
Without an LSD I don't know how this would be resolved, but I believe there is something to code to tell the car you have a mechanical LSD installed. It's a simple on or off? Not sure
|
Appreciate
0
|
08-23-2015, 09:52 AM | #19 |
Lieutenant Colonel
1008
Rep 1,563
Posts |
I just wanted to report back that unlike the extremely unhelpful user _Ryan_, Alex@Alpine was incredible.
Alex was able to code out the e-diff and "brake disc too high" and my car now behaves properly on the track. |
Appreciate
0
|
08-23-2015, 02:54 PM | #21 |
Lieutenant Colonel
1008
Rep 1,563
Posts |
|
Appreciate
0
|
08-24-2015, 12:13 AM | #22 |
Brigadier General
1254
Rep 4,088
Posts |
Interesting... I think I need to try this out. I'm definitely cutting power on the track, despite my suspension and LSD mods...
|
Appreciate
0
|
Bookmarks |
|
|