DME, ABS, other Module warning triggers during track use with N54

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Corporal
Platinum Vendor
Jun 4, 2018
129
I know a lot of this has been covered, I just wanted to get it collected in one spot so to speak. Here are my notes that I have gathered from others who track their N54 based cars. Please let me know if any of this is incorrect or if you have anything else to add from your experiences.

Oil Temp: (BMW literature)
Reduced Power: 150C - 302F
Limp Mode: 158C - 316F

Water Temp: (BMW literature)
Reduced Power: 117C - 242F
Limp Mode: 125C - 257F

*How the head is not a banana at 257F is beyond me.

IAT: (Heard on the internet)
Reduced Timing: 50C - 122F

Ambient Temp:
No reduced power modes

CAT Protection: (heard on the internet)
There is a calculated EGT for CAT protection. Someone ran into this with their 135i. If the limit is reached it will go into power reduction or limp mode.
Fuel > EGT Nox Set Point (CAT protection mode)

ABS Fault: (BMW literature and heard on the internet)
May only apply to eDiff cars?
If calculated brake temperature from repeated brake actuation of eDiff is exceeded then it will shut off eDiff?

Corner Brake Control:
This isn't really a "warning," it is more of a hindrance on track. This can be turned off using ProTools app. Not sure of what cars have this. I know the 1M does.
Link to a lot of information about CBC: https://www.1addicts.com/forums/showthread.php?t=578573

Tire Pressure Indicator Warning:
If you have track wheels without tire pressure monitors. This can be turned off in ProTools app.

Engine Power Reduction to Prevent Brake Disc Overheating (FLR)

Brake Fading Compensation (FBS)





Thanks!!
 
Last edited:

Asbjorn

Corporal
Mar 10, 2018
185
I agree with your observations, and must admit I never heard about cat protection before.

As for corner brake control, I think it is just stability control? Like when the car understeers it brakes one of the wheels to pull the car back in. At least mine does that in DSC=on, sport+ and traction mode. It goes away completely with dsc=off.

With dsc=off I still have eDiff, which works fine in tandem with the quaife diff. At least in theory, with quaife the eDiff never has to work unless you hit a large curb and a wheel lifts off the ground. AFAIK a quaife diff doesn't lock well with a wheel off the ground, so then the eDiff kicks in. I would be happy to know if I am wrong though.

Finally I would add ABS to your list. Some racing requires no ABS, and it can also be used for practice and setting up brake balance. Also I just thought about something. Wouldn't it be really interesting if one could have the AG ABS calibration for rainy track days and M ABS calibration for sunny track days. I mean, I assume they are calibrated differently based on expected friction (RFTs for AG vs PSS for M).
 

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Corporal
Platinum Vendor
Jun 4, 2018
129
I agree with your observations, and must admit I never heard about cat protection before.

As for corner brake control, I think it is just stability control? Like when the car understeers it brakes one of the wheels to pull the car back in. At least mine does that in DSC=on, sport+ and traction mode. It goes away completely with dsc=off.

With dsc=off I still have eDiff, which works fine in tandem with the quaife diff. At least in theory, with quaife the eDiff never has to work unless you hit a large curb and a wheel lifts off the ground. AFAIK a quaife diff doesn't lock well with a wheel off the ground, so then the eDiff kicks in. I would be happy to know if I am wrong though.

Finally I would add ABS to your list. Some racing requires no ABS, and it can also be used for practice and setting up brake balance. Also I just thought about something. Wouldn't it be really interesting if one could have the AG ABS calibration for rainy track days and M ABS calibration for sunny track days. I mean, I assume they are calibrated differently based on expected friction (RFTs for AG vs PSS for M).
Corner brake control is in addition to stability control. Turning DSC off does not turn corner brake control off. You have to code it out. I don't think many cars have such as your Z4, but not 100% sure.

Keeping eDiff on with a quaiffe diff makes sense. If you have a clutch type diff it would make sense to just turn eDiff off.

Most racing classes in the US allow ABS and you would never want to turn it off. The Mk60 E5 in these cars is fantastic as is. In a racecar, however, I would likely run a standalone 1st Generation MK60 (From E46 M3) and have my guy in England custom code it. Or I would spring for Bosch Clubsport programmable motorsport ABS. Big $$ though.
 
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SJ_1989

Private
Aug 7, 2018
40
Peoria, IL
What happens if the ABS valve is removed entirely and the OEM power brakes remain (i.e. no aftermarket pedal box) and factory DME? Does the DME freak out and go into reduced or limp mode? I would think not based on what I've read with people having issues with the ABS valve and wheel speed sensors and my experience in ABS design on off-highway construction equipment but not sure. Similarly, what would happen if the ABS module was removed as well? Anyone know?
 

MDORPHN

Specialist
Jan 28, 2018
76
I agree with your observations, and must admit I never heard about cat protection before.

As for corner brake control, I think it is just stability control? Like when the car understeers it brakes one of the wheels to pull the car back in. At least mine does that in DSC=on, sport+ and traction mode. It goes away completely with dsc=off.

With dsc=off I still have eDiff, which works fine in tandem with the quaife diff. At least in theory, with quaife the eDiff never has to work unless you hit a large curb and a wheel lifts off the ground. AFAIK a quaife diff doesn't lock well with a wheel off the ground, so then the eDiff kicks in. I would be happy to know if I am wrong though.

Finally I would add ABS to your list. Some racing requires no ABS, and it can also be used for practice and setting up brake balance. Also I just thought about something. Wouldn't it be really interesting if one could have the AG ABS calibration for rainy track days and M ABS calibration for sunny track days. I mean, I assume they are calibrated differently based on expected friction (RFTs for AG vs PSS for M).
Long thread about corner braking control here:


Neil
 
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[email protected]

Corporal
Platinum Vendor
Jun 4, 2018
129
What happens if the ABS valve is removed entirely and the OEM power brakes remain (i.e. no aftermarket pedal box) and factory DME? Does the DME freak out and go into reduced or limp mode? I would think not based on what I've read with people having issues with the ABS valve and wheel speed sensors and my experience in ABS design on off-highway construction equipment but not sure. Similarly, what would happen if the ABS module was removed as well? Anyone know?
The factory brake system is heavily biased to the rear. If you turn off or remove ABS and retain the OEM pedals/master cylinder, you would have to put an inline pressure reducer to each rear brake circuit to get the bias correct. I've played around with those in the past and they are not good or reliable. The more you clamp down on them the pressure release is slow and can drag the rear brakes when you release the pedal.

The DME doesn't care about ABS. No fault codes or reduced power as far as I know.
 

SJ_1989

Private
Aug 7, 2018
40
Peoria, IL
I was wondering if there was any pressure bias front to rear. If you put a check valve in parallel with the PRV with the free flow direction from rear brake to reservoir that should take care of the brake drag issue. Not ideal though.
 

MDORPHN

Specialist
Jan 28, 2018
76
Here is the stock table for IAT timing reduction (for IJE0S). IAT on the X axis, coolant temp on the Y axis.

View attachment 24587
Really interesting table. And since "normal" coolant temps regularly run up to the 220s (depending on the mode), only a slight increase in IATs on a very hot day will result in timing being pulled.

Neil
 
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[email protected]

Corporal
Platinum Vendor
Jun 4, 2018
129
Agreed, it should. What'd you end up doing on the E46 to resolve turbulence in the lower portion. I mean, isn't that a result of the car ingesting air and it not able to pass through the top section of the core where it ends up bouncing around and causing turbulence on the bottom section of kidney grille?

Also, shout when you're guy in England can program these ABS Controllers/Modules :) for something like semis/R comp or slightly stickier compound like Cup2s.
Hoping to move cooling discussion to other thread, but in the mean time...

Hood vents were installed to help air flow through radiator. Have not done more video yet, as the vents were a winter project. If there was ducting that started at the bottom of the kidney grill and curved down that would help remove the dead space causing turbulence. So the string thing was an exercise to show that. Any air opening should have ducting right up to the heat exchanger to help with air flow.

ABS...

I looked into it briefly this past fall but it wasn't priority, it was just misc conversation, IE I can't remember off hand but i'll look into it again. At minimum the pump needs to be sent to England to be coded bench top.
 

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Corporal
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Jun 4, 2018
129

Hydra Performance

Corporal
Free Vendor
Jan 31, 2017
200
Barry,
How about expanding this thread to also include intrusive DSC-related coding nannies that are best removed as well? For instance during my first trackday/test I got the Engine Power Reduction to Prevent Brake Disc Overheating (FLR) nanny, and quite a few times at that. I would also suggest that Brake Fading Compensation (FBS) be coded out as well... There's more to it obviously, but I would start with those two.
 
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[email protected]

Corporal
Platinum Vendor
Jun 4, 2018
129
Barry,
How about expanding this thread to also include intrusive DSC-related coding nannies that are best removed as well? For instance during my first trackday/test I got the Engine Power Reduction to Prevent Brake Disc Overheating (FLR) nanny, and quite a few times at that. I would also suggest that Brake Fading Compensation (FBS) be coded out as well... There's more to it obviously, but I would start with those two.
I will add those the the main post. I'll check to see if ProTools has the option to code those out. Otherwise I guess it will be the traditional way of coding out.
 

KevinC39

Corporal
Jun 27, 2017
128
I'd definitely love an easy way to code out all the stuff you don't need after putting in an LSD. I just haven't looked in to how to do it yet. Any idea if protools does? I've not downloaded the app to look around before.
 

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Corporal
Platinum Vendor
Jun 4, 2018
129
I'd definitely love an easy way to code out all the stuff you don't need after putting in an LSD. I just haven't looked in to how to do it yet. Any idea if protools does? I've not downloaded the app to look around before.
Pro tools will code out the Ediff stuff. I have not tried it since my car does not have ediff but I saw it in the list of options. I'll try to capture a screen shot of all the options and post it up.
 

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