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BMW 3-Series (E90 E92) Forum
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Car reducing power via DSC because "brake disc temperature is too high"
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01-05-2016, 08:24 PM | #45 |
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Have your modules been updated? That's all it takes to activate the E-diff on the early build pre E-diff cars.
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01-05-2016, 09:52 PM | #46 | |
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I've shared my cars info above but since you asked here it is again : E90 335i MT M-tech built in March 2008 so pretty much last build for 2008 titled cars. When I turn off DSC I can spin one or both wheels like endlessly. Non LSD Correction -not endlessly because these cars do brake down a LOT. I track and been out on the track during pouring rain so I can tell you that even at high speeds it will spin the whees. It will even red line. Also, since I live in Chicago and this is my DD I have covered a lot of miles on snowy and icy roads where the wheels do spin. Aditionally, had plenty of fun at the harbors parking lot that is closed at winter doing power slides and donuts. That is what I have found from driving and working on these cars. |
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01-05-2016, 10:56 PM | #47 | |
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ABS (Anti-Lock Brake System) is not the e-diff, ADB (automated differential brake) is. ADB, as seen on 1 series vehicles and 3 series since march of 2008 is a discrete system from ABS (as well as DSC & DTC). It cannot be turned off without coding, not even in Manual mode. To learn more about the e-diff, or eLSD, or ABD as it is variously called, this forum thread is a good place to start: http://www.1addicts.com/forums/showthread.php?t=719012 The original post contains most of the valuable information that the rest of the thread mulls over. This write up does a good job encapsulating exactly what the e-diff is: http://www.bimmerfile.com/2010/11/15...rol-explained/ So, in conclusion, the ADB system is always active, however DSC and DTC can intrude and reduce its effect (cut throttle, apply brakes to realign the car or regain control, etc), but when all nannies are turned off with a 3 second press of the dtc/dsc button, it remains active and operates in the same manner as a mechanical limited slip differential, except it shifts torque via selective and progressive friction on the rear brakes (all brakes in a x-drive vehicle) rather than mechanical friction of gears in an LSD.
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01-05-2016, 11:30 PM | #48 | |
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Since my car March 2008 it doesn't have e-diff. Correct? How do you explain 2009 or 2010 that would spin single wheel with DSC turned off? If yes I assume my 62 years old mother in law took her 2010 e93 335i to have the e-diff coded off because that car for sure as hell would spin only one wheel too. Just like mine 2008... |
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01-06-2016, 12:00 AM | #49 | |
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Anyhow, as stated previously 2 track frequent 335i's bulld in 2006 and 2007 suffer from accelerated rear pads wear and reduced engine power even with DSC off. What that tells us? That they have e-diff that won't turn off. If 2006 and 2007 has it why mine 2008 doesn't? Mine will spin single wheel and render me stuck somewhere. If e-diff is always on it would interfere, apply brakes to the spinning wheel so the diff will start turning the other wheel. It doesn't. That is why I think that 2008 and up can turn it off when DSC is off and older models can't and this is not just from reading on the Web but by driving, especially 335i's, built from late 2006 to late 2009, titled 2007 and 2010 respectively. |
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01-06-2016, 12:18 AM | #50 | |
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If a a 3 series produced beyond that point exhibits continuous single wheel spin, then I can only assume either the e-diff was coded off, or a wire is loose, or there is a malfunction. Continuous single wheel spin wouldn't happen with dsc engaged as the throttle would cut and brakes would engage to correct, and shouldn't happen at all with DTC. With both completely off, the ADB system should be modulating torque similarly to a mechanical LSD without any nannies to intrude. I once had a loose wire that resulted in the shutdown of the entire stability control suite in my car. I was having single wheel slip off of every light and odd stability issues past 50mph. It was damn scary to drive, actually. I again can only point you to the links I posted and suggest further researching the problem with you mother in law's car. I am only repeating what I've read and experienced myself.
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Last edited by Dozhdbog; 01-06-2016 at 12:28 AM.. |
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01-06-2016, 08:04 AM | #52 | |
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Everything works off of the ABS system and impulse reading from the ABS sensors. If a loose wire was ABS cable for the ABS sensor would have resulted in most of the faults I stated above. |
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01-19-2016, 08:43 AM | #53 |
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Here is a really good break down of the electronic nannies that you might want to look at coding off for track duty.
http://www.onelapx1.com/the-story/ho...w-actually-fun
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01-24-2016, 10:22 PM | #54 | |
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01-25-2016, 01:33 PM | #55 |
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01-26-2016, 07:21 PM | #56 |
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01-26-2016, 07:39 PM | #57 |
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FWIW, I was talking with the driver and car chief at the shop today about coding out a lot of this stuff and they just looked at me funny and said they just unplug the DSC from the ABS by popping the pins out of the connector to the DME. Reduces the ABS system to purely ABS with no stability inputs from the DSC module which quits doing anything when it loses communication with the DME. Or maybe it's a bit more complicated than that, I was trying to follow the discussion. Regardless, they're going to do it to my car so we can skip the coding other than getting rid of all the warning lights on the dash.
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01-26-2016, 08:33 PM | #58 | |
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01-26-2016, 08:33 PM | #59 |
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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
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01-26-2016, 08:39 PM | #60 |
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01-26-2016, 08:45 PM | #61 |
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Gotcha, thanks. I know they do this to all their race cars but they haven't done this to an e90 yet but they don't think it's a big deal. If I can get the details on it I'll publish them here. Would be nice to have all the crap nannies gone with only the ABS left behind.
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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
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01-27-2016, 11:45 AM | #62 | |
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01-27-2016, 11:58 AM | #63 | |
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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
Last edited by justpete; 01-27-2016 at 01:29 PM.. |
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