M Track Mode enabled on Z4MR

M

Meeko

Member
Hi all,

I know this has been done to death and we know that we can't retrofit the M Track option to our cars as the MK60 module doesn't have the required function (TRAKTIONDIFFERENZREGELUNG amongst others) to enable.

But we do have other functions that look to alter the behaviour of DSC when enabled. Has anyone had a play with these? I've found:

PRE_MSR (Pre-Engine Drag-Torque Control)
UNTERSTEUERSCHWELLE_2 (UNDERSTEER THRESHOLD)
UNTERSTEUERN_MUE_1_2 (UNDERSTEER Friction Coeff)
UEBERSTEUERN_MUE_1_2 (Oversteer Friction Coeff)
UNTERSTEUERN_MUE_0_2 (UNDERSTEER Friction Coeff)
UEBERSTEUERN_MUE_0_2 (OVERSTEER Friction Coeff)


So I think changing these will alter how DSC intervenes when it's enabled, but there is no way of adding anothere mode. It's either On or Off for us. I'd be keen to have more slip when DSC is on, even if it's permanantly that way. The CSL has a higher "wert" value for oversteer and lower for underesteer. But according to this page - http://www.m3post.com/forums/showthread.php?t=956396 there is a formula for calculating the Friction Coefficient. So a higher value could relate to lower friction coefficient before the DSC kicks in - i.e more allowable over/understeer.

Who's brave enough to have a play?!
 
M-teck mode has been activated by numerous over seas members. or according to them it has.... their was a thread on this. very interesting stuff!!
 
It did annoy me that the M doesn't have the 3 settings like my 2.5 E85 had, although I did notice it's more lenient on the M anyway. Don't think I'd bother reprogramming it though, could be very risky without lots of trial and error and heavy testing.
 
I've scoured the web and can't find any references to successfuly enabling of M Track on Z4Ms...

I've just read out my MK60 module and found the values. The first is the HEX, second decimal and third the coefficient as calculated using the formula I found on another board (which applied to E46 M3s, but no reason to think it's not the same for the MK60.C20 module in the E85 Z4M). The formula is:

if value < 128 then
coefficient = 2.5 + (value/64)
else
coefficient = 2.5 + ((value-256)/64)

The values in the Z4M are as follows (Hex - Dec - Coefficient):

UEBERSTEUERN_MUE_0_2
B3 - 179 - 1.296875

UEBERSTEUERN_MUE_1_2
80 - 128 - 0.5

UNTERSTEUERN_MUE_0_2
A6 - 166 - 1.09375

UNTERSTEUERN_MUE_1_2
80 - 128 - 0.5

My thoery was 1_2 could be with DSC off (i.e DSC intervenes with lower friction/more slip due to lower value), and 0_2 could be with DSC on (i.e. DSC intervenes with higher friction/less slip due to higher value). I modifed the DATEN Module with a new value of 80 for UEBERSTEUERN_MUE_0_2 (i.e matching the value for UEBERSTEUERN_MUE_1_2) . This coded successfully, but made no noticable difference to the car. I induced oversteer pulling away on lock and it killed the power with DSC on, and with DSC off allowed a drift as normal.

So back to drawing board!
 
Sim_Simma said:
It did annoy me that the M doesn't have the 3 settings like my 2.5 E85 had, although I did notice it's more lenient on the M anyway. Don't think I'd bother reprogramming it though, could be very risky without lots of trial and error and heavy testing.
Click to expand...

The OP isn't talking about the same settings as a 3.0i

Because we have a LSD one of the settings would have no effect.

The Track option is something else all together.
 
srhutch said:
Sim_Simma said:
It did annoy me that the M doesn't have the 3 settings like my 2.5 E85 had, although I did notice it's more lenient on the M anyway. Don't think I'd bother reprogramming it though, could be very risky without lots of trial and error and heavy testing.
Click to expand...

The OP isn't talking about the same settings as a 3.0i

Because we have a LSD one of the settings would have no effect.

The Track option is something else all together.
Click to expand...
that'll teach me not to skim the post haha, must pay closer attention!
 
Meeko, I know absolutely nothing about coding, but would love to know about it.

I've studied the formulae that you've listed and seen what you've tried to modify. This might be a stupid suggestion, but would it be possible to change the coefficient in the "oversteer" formulae to allow the car to get a bit more out of shape before the DSC intervenes?
 
exactly what i have always thought the m should have, more leeway to power oversteer with dsc on. it is one of the worse things about the M, its rediculously intrusive traction, i only ever leave it on if the roads are exceptionally greasy.even with it switched off i find the M diff so efficient at getting the power down and eliminating wheelspin. I am looking at a less toed in alignment to loosen up the rear end. still reading up about settings but more neutral seems the way to go it seems. :thumbsup:
 
I'm pretty sure, that there was a thread about z4m from germany which had been coded to have m-track mode from csl - it used to work as in normal z4 - short press of dsc button switched the m-track mode and lit a dtc light on the dash, and long press was used to fully deactivate all driver aids

TapaTalking
 
McKoval said:
I'm pretty sure, that there was a thread about z4m from germany which had been coded to have m-track mode from csl - it used to work as in normal z4 - short press of dsc button switched the m-track mode and lit a dtc light on the dash, and long press was used to fully deactivate all driver aids

TapaTalking
Click to expand...

I think it was the guy that owned a hotel/restaurant from memory.
 
so when the german guys are coding this do we actually get the m-track logo illuminate on the instrument panel ?
 
I think you dont have m logo on the dash, which could be illuminated.
AFAIK you get DTC illuminated on the dash

TapaTalking
 
I'VE ENABLED M TRACK MODE ON MY Z4M ROADSTER!!

After my failed attempt at changing the friction coefficient when DSC is on, I went back to the drawing board. It does indeed seem that a chap in Germany was enabling M Track mode on Z4Ms for EUR150.

I tried to copy the DATEN function (TRAKTIONDIFFERENZREGELUNG) from the C13 MK60 module to the C20 module as used in the Z4M and noticed that a function called TDR was already configured through the same memory address. I thought maybe TDR was an acronyn for "TRAKTION DIFFERENZ REGELUNG", so I enabled it.

Now I have M Track mode! Pressing the DSC button lights the DTC lamp (we don't have the M Track light in the Z4M), and holding DSC turns it off, displaying the usual light.

I did a brief test by trying a slide in a dry empty trading estate, and it may have enabled a little more slip, but still was very intrusive. From what I've read though, it's the wet where it makes the difference.

Anyway, feel free to code it on your car and report back!
 
i have no clue how to do this......but I'm very jealous!! id use this mostly on the road... always off on the track....
 
Meeko, I'm sure that a few of us would like to know how we would go about examining and rewriting to the DME. What hardware and software is required to make the 2-way connection and what are the necessary things to do? If you can give some links to any guides for Dummies that would also be appreciated. :thumbsup:
 
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