Disabling DCS torque reduction for road course track tune

hollracing

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Oct 26, 2022
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I did not have a chance to test the previous file you posted. The car is on 245 square with coilvers/camber and it's pretty low I get some bump steer

I thought the 1M DSC was a different module ? There were some retrofit posts, they use different brakes and possibly master cycl
The low part might also be a reason for your intervention but for now will continue on to assume it is the change in steering rack as this seems most likely with the info provided.

The 1m unit has many differences and I am well aware there will be newnissues that come with it, but most will be once in intervention not when it does. And hence it was a suggestion as just an alternative because it will likely fix your specific problem, and the new issues might not be a problem for you.

The 1m/M3 unit has a different motor for the pump. I believe the control units are the same. M3 and believe also 1M use DSC8 where as ag 6cyl uses DS8+.
The vehicle dynamics models for the 1m will obviously be completely different but in away that's close enough to a higher performance version of what of your car was standard, where as now the standard 135i models in your unit are lower performance than what state the car is now. Same for the brakes. Most of the differences would mean you would likely only notice that they only really effect how it intervenes rather than when.
 

MrBlah

Specialist
Aug 31, 2019
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135i, 335i, x5d, r53
Ahh M3 rack! ok that’s starting to make, at least a little more sense.
I wouldn't think the Servotronic being non-operational is a contributing factor.

Its still strange and fascinating that this is happening in dsc off mode!?!
Is this a US Spec car by chance?

With DSC on mode or DTC I would be pretty confident in guessing the intervention being DSC (esp/stability control) and will assume for now it is the case for you although you have it in DSC off mode.
So probably not ASC/ASR intervention which might be explanation why the ecu changes for ASC/ASR weren’t effective...

The DSC controller expects a given amount of yaw - for a given steering wheel angle - at a given velocity. Or “steering characteristic".
As the m3 rack is “quicker” the measured yaw will be higher than what it is expecting for the measured amount of steering...
So, I'm guessing it assumes, as the measured yaw is higher than expected it is oversteering (lower would-be understeer).
This is quite a common complaint with retrofitted m3 rack, and I have wanted to test some coding changes that I would expect to effect this...

Are there any other modifications that would change the way in which the standard car behaves dynamically? wheels &/or tyres ect?

Attached is another NETTODAT.MAN for you to try. I have discarded my last changes, I take it you didn't try that out?
In theory this should make at least a noticeable difference. It may not be a complete cure, I have made only 1x change to your original TRC, there are more options that can be changed that will likely affect this, but if we do them separately it will provide definitive results.

There is also scope in the coding I believe to enter parameters to define a custom steering characteristic model, but I don't yet understand them enough... yet. Alternatively, you could try load the DSCM80 .0pa as the 1M came already with that rack.
trc file is identical to what's on my car.
 

hollracing

Private
Oct 26, 2022
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trc file is identical to what's on my car.
Are you sure? I've just double checked at my end and shows the single change I made. Are you coding by FSW_PSW.man? if so might pay switch to using NETTODAT.MAN.
Alternatively try manually changing address: 0030000D mask: 0x07 "C0C_LENKWINKELKENNLINIE - STEERING ANGLE CHARACTERISTIC CURVE" to an option with a lower data value than the 0x04 that your original trace had ideally 0x00 or 0x01.
Let me know how you get on?
Are you at the track today?
 

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MrBlah

Specialist
Aug 31, 2019
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135i, 335i, x5d, r53
next track days is december 3rd same track I was at the last time
 

MrBlah

Specialist
Aug 31, 2019
62
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135i, 335i, x5d, r53
I wish there was a setting like my R53 mini's have, you can load up the ECU into NCSEXPERT and toggle DSC off, poof no more assists but it keeps ABS on
 

AzNdevil

Lieutenant
Staff member
Nov 4, 2016
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Hong Kong
Have a go at this, for IJE0S, i tested it before and it works...pretty fun watching the traction control light flash and still be able to play with the throttle


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MSR function avoids the vehicle from skidding on e.g. icy surfaces by reducing the drag torque of the engine at trailing throttle and trailing throttle fuel cut off. For to reach a higher lateral stability of the wheels the indicated engine torque is increased to reduce wheel slip.
 

MrBlah

Specialist
Aug 31, 2019
62
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135i, 335i, x5d, r53
Have a go at this, for IJE0S, i tested it before and it works...pretty fun watching the traction control light flash and still be able to play with the throttle


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MSR function avoids the vehicle from skidding on e.g. icy surfaces by reducing the drag torque of the engine at trailing throttle and trailing throttle fuel cut off. For to reach a higher lateral stability of the wheels the indicated engine torque is increased to reduce wheel slip.
I have i8a0s and in that asr address it has 5C
 

MrBlah

Specialist
Aug 31, 2019
62
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135i, 335i, x5d, r53
Hey! Were you able to find correct adresses for I8?
nope and I've got another track weekend coming up fast... no luck on fakebook either most of the "tuners" only know how to remap fuel/spark/torque requests
 

KClemente

Sergeant
Nov 26, 2019
284
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E90 335i
@AzNdevil @carabuser can you guys possibly help out with I8 definitions on disabling ASR? I’ll try looking again when I get home but couldn’t definitively find it last I looked
 

MR-KRAKA

Specialist
May 23, 2020
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nope and I've got another track weekend coming up fast... no luck on fakebook either most of the "tuners" only know how to remap fuel/spark/torque requests
Did you try any more of the addresses in that range I sent you? Last message you sent you said those helped some.
@AzNdevil @carabuser can you guys possibly help out with I8 definitions on disabling ASR? I’ll try looking again when I get home but couldn’t definitively find it last I looked
I’m confident ASR/MSR is within 43AAF- 43B4E on i8 if not those exact addresses. It’s clustered in with lots of other toggles so kind of tricky with what I have to work with. I only have MSD81’s here currently so can’t test.
 

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carabuser

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Oct 2, 2019
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@AzNdevil @carabuser can you guys possibly help out with I8 definitions on disabling ASR? I’ll try looking again when I get home but couldn’t definitively find it last I looked
I posted the information he needs to work out what is causing the issue. If ASR or MSR are shown then I can disable that. It seems unlikely though as he said he already has it disabled but still gets torque pulls.
 

MrBlah

Specialist
Aug 31, 2019
62
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135i, 335i, x5d, r53
Did you try any more of the addresses in that range I sent you? Last message you sent you said those helped some.

I’m confident ASR/MSR is within 43AAF- 43B4E on i8 if not those exact addresses. It’s clustered in with lots of other toggles so kind of tricky with what I have to work with. I only have MSD81’s here currently so can’t test.
there are so many toggles in that range I do not want to turn off something I need, I tried the ones posted and they did not disable the torque reductions.

For the track this weekend I disconnected the YAW sensor under the seat, ABS still works and it will not cut power under any circumstances that I tried. My only concern with this method is ABS ice mode. I installed a switch so if it tries to kill me and send me into the woods I can turn it back on
 
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AzNdevil

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Nov 4, 2016
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@AzNdevil @carabuser can you guys possibly help out with I8 definitions on disabling ASR? I’ll try looking again when I get home but couldn’t definitively find it last I looked
nope and I've got another track weekend coming up fast... no luck on fakebook either most of the "tuners" only know how to remap fuel/spark/torque requests

Hey! Were you able to find correct adresses for I8?

sorry missed the message, was on holiday..
anyways, try at your own risk, im not 100% sure

i8a0s

asr - 42CD9
msr - 42D70
 

Sava666

Corporal
Dec 14, 2020
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there are so many toggles in that range I do not want to turn off something I need, I tried the ones posted and they did not disable the torque reductions.

For the track this weekend I disconnected the YAW sensor under the seat, ABS still works and it will not cut power under any circumstances that I tried. My only concern with this method is ABS ice mode. I installed a switch so if it tries to kill me and send me into the woods I can turn it back on
Keep me updated please. Im at hitch and can't check. Appreciate.
 

KClemente

Sergeant
Nov 26, 2019
284
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E90 335i
42CD9 pretty much seems like the ASR toggle to me. Only TC works on the brakes now and the dme doesn’t cut the throttle or ignition during aggressive wheel slip. I’ll confirm ignition and throttle with a log, though I can get some mad wheel spin with traction control fully on

I really wouldn’t recommend turning it off on a street car as it pretty much cripples your traction control.
 

Sava666

Corporal
Dec 14, 2020
170
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42CD9 pretty much seems like the ASR toggle to me. Only TC works on the brakes now and the dme doesn’t cut the throttle or ignition during aggressive wheel slip. I’ll confirm ignition and throttle with a log, though I can get some mad wheel spin with traction control fully on

I really wouldn’t recommend turning it off on a street car as it pretty much cripples your traction control.
Good observations, mate. Indeed, we should use everything with caution )) Keep me updated, whenever you find the MSR toggle.