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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 03-06-2016, 01:39 AM   #1
daniel_f.
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Official thread for people with non-working Launch Control

Hello guys,

id like to bundle the information of you guys that have a non-working launch control, to get an idea whats going on.

Therefore i need some info:

1. what exact file did you flash
2. what exact xdf are you using
3. did you modify anything on the tune before or after flashing
4. what engine are you running
5. what gearbox does the car have
6. what diff are you using
7. whats the behaviour of the launch control passing launch rpm
8. upload your latest full flash file where LC does not work and drop me a PM with the link


Lets try to work out whats going on

Edit:

Implementation of non-variable LaunchControl is pretty simple. It just measures and compares a few values/conditions that need to be match.

Heres whats done:
1. DME compares if config switch for launch control is 1, if not itll leave LC function
2. DME looks up if clutch pedal is pressed, if not itll leave LC function
3. DME compares actual rpm with selected LC rpm, if its below itll leave LC function
4. DME compares actual accelerator pedal angle with selected angle, if its below it`ll leave LC function
5. DME compares actual vehicle speed with selected VS limit, if its above itll leave LC function
6. DME compares actual coolant temp with selected treshold, if its below itll leave the LC function
7. DME sets hardlimiter and softlimiter according to the choosen LC rpm treshold

So, you there are just a few conditions that need to be set/matched to make LC work on every MS43 manual car. You should try taking a look if the DME senses the clutch switch by having a look at INPAs digital signal tab.

Interim solution until we finally find the problem thats causing this mess:

PW -> PN

File is designed to ONLY work with manual M54B25 cars, you must not flash a car with automatic gearbox with this software.

http://www22.zippyshare.com/v/1LE2yHjF/file.html

Modded xdf file to only match the upper flash file!
http://www1.zippyshare.com/v/uorA99c3/file.html
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Last edited by daniel_f.; 03-21-2016 at 10:18 AM.
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Old 03-06-2016, 01:47 AM   #2
mrbobmicjoe
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1. flashed "MS430056_M54B25_Logger_EWSsignature_CHK5off_LC.bin"
2. using "MS430056_64kb_Eng_Level_Launch.xdf"
3. set speed limit to max, bumped up rev limit, forced ob readiness
4. M54B25
5. 5 Speed Manual Getrag
6. 3.15 factory dif
7. At stand still in 1 st with clutch in when i floor it, RPM just shoots straight to redline
8. in your inbox
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Last edited by mrbobmicjoe; 03-06-2016 at 01:53 AM.
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Old 03-06-2016, 08:17 AM   #3
cwarel
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Same as mrbobmicjoe only my diff is 2.930
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Old 03-06-2016, 08:26 AM   #4
matt270avian
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2002 325xi Sedan

1. flashed "MS430056_M54B25_Logger_EWSsignature_CHK5off_LC.bin"
2. using "MS430056_64kb_Eng_Level_Launch.xdf"
3. Launch RPM and pedal position (lowered both)
4. M54B25
5. 5 Speed Manual
6. 3.23 factory diff
7. Stopped in 1st with clutch in RPM grabs at 2500 (set point) for a split second and then goes to redline.
8. I hope this is what you were looking for.... (Inside the "Take 1" folder) https://www.dropbox.com/sh/uth10670b...-20DD5b4a?dl=0

Last edited by matt270avian; 03-06-2016 at 08:27 AM.
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Old 03-06-2016, 04:50 PM   #5
thecos
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I flashed LC today to a DME from another car, a 2001 330Ci w. Manual Trans. My car is a 2002 325i.

1. flashed "MS430056_M54B25_Logger_EWSsignature_CHK5off_LC.bin"
2. using "MS430056_64kb_Eng_Level_Launch.xdf"
3. Launch RPM set to 2496 and pedal position to 69.
4. M54B25
5. 5 Speed Manual
6. 3.46 Diff from an Auto
7. I had some weird behavior because it worked a few times, held RPM to near 3k on the cluster then dropped close to 2500.
Other times it bounces off around 3k on the cluster 1, 2 or 3 times then shoots up. I thought it had something to do with the clutch switch or the car rolling but I havent done enough testing to be sure.
8. I'll send you the 64k now if that helps but if you need the full flash I'll get it. I flashed the above LC full file then used Galletto to get the 64k, changed the RPM and Pedal Position, then reflashed with Galletto.

I'd like to figure out how to code a more definitive limit instead of a 500 RPM bounce, like in this video:

Last but not least thanks for all your help and info you've made public.

Last edited by thecos; 03-06-2016 at 04:58 PM.
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Old 03-07-2016, 01:03 AM   #6
daniel_f.
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Quote:
Originally Posted by thecos View Post
I flashed LC today to a DME from another car, a 2001 330Ci w. Manual Trans. My car is a 2002 325i.

1. flashed "MS430056_M54B25_Logger_EWSsignature_CHK5off_LC.bin"
2. using "MS430056_64kb_Eng_Level_Launch.xdf"
3. Launch RPM set to 2496 and pedal position to 69.
4. M54B25
5. 5 Speed Manual
6. 3.46 Diff from an Auto
7. I had some weird behavior because it worked a few times, held RPM to near 3k on the cluster then dropped close to 2500.
Other times it bounces off around 3k on the cluster 1, 2 or 3 times then shoots up. I thought it had something to do with the clutch switch or the car rolling but I havent done enough testing to be sure.
8. I'll send you the 64k now if that helps but if you need the full flash I'll get it. I flashed the above LC full file then used Galletto to get the 64k, changed the RPM and Pedal Position, then reflashed with Galletto.

I'd like to figure out how to code a more definitive limit instead of a 500 RPM bounce, like in this video:

Last but not least thanks for all your help and info you've made public.
So all your cars are B25?

Try this file and tell me if limiting below 4000rpm works.

http://www21.zippyshare.com/v/o2NdjtKl/file.html
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Old 03-07-2016, 07:36 AM   #7
matt270avian
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Looks like that would be the case. I'll download/flash/try it before the weekend. Thanks!
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Old 03-09-2016, 08:23 PM   #8
thecos
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Quote:
Originally Posted by daniel_f. View Post
So all your cars are B25?

Try this file and tell me if limiting below 4000rpm works.

http://www21.zippyshare.com/v/o2NdjtKl/file.html
I flashed this tonight, did not change any parameters. Drove around for a bit and it's working perfectly for me so far. It's also holding the RPM more constant instead of sweeping like it was before.

Here is a video:

What changes did you make? I'd like to learn how LC was coded into the DME. Can you point me to some reading material?
Thanks!

Last edited by thecos; 03-09-2016 at 08:50 PM.
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Old 03-09-2016, 10:05 PM   #9
cwarel
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I think daniel changed max rpm limit on gear 0 , i looked up on tunerpro , and i noticed on gear 0 hard limiter rpm was set to 3000 something , and soft 3020 something , so i guess with that flash you cant rev your car at idle more than 3 k , but you have LC now))
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Old 03-09-2016, 10:06 PM   #10
mrbobmicjoe
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Quote:
Originally Posted by cwarel View Post
I think daniel changed max rpm limit on gear 0 , i looked up on tunerpro , and i noticed on gear 0 hard limiter rpm was set to 3000 something , and soft 3020 something , so i guess with that flash you cant rev your car at idle more than 3 k , but you have LC now))
thats exactly what he did. he told me this was just to test.... Something is wrong with the actual launch control and will be sorted out in the next few weeks
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Old 03-09-2016, 10:10 PM   #11
cwarel
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could it be clutch switch related?
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Old 03-10-2016, 01:41 AM   #12
daniel_f.
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Quote:
Originally Posted by thecos View Post
I flashed this tonight, did not change any parameters. Drove around for a bit and it's working perfectly for me so far. It's also holding the RPM more constant instead of sweeping like it was before.

Here is a video:

What changes did you make? I'd like to learn how LC was coded into the DME. Can you point me to some reading material?
Thanks!
That looks like expected. There is no instructions on how to implement such features, you need a full disassembly, some understanding on assembly language and luck or a good mentor
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Old 03-10-2016, 06:02 AM   #13
thecos
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Quote:
Originally Posted by cwarel View Post
I think daniel changed max rpm limit on gear 0 , i looked up on tunerpro , and i noticed on gear 0 hard limiter rpm was set to 3000 something , and soft 3020 something , so i guess with that flash you cant rev your car at idle more than 3 k , but you have LC now))
Confirmed. 3k limit when stopped regardless of clutch being depressed.
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Old 03-10-2016, 06:42 AM   #14
daniel_f.
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I may have an idea on a work around, ill try changing the code later today.
That should work
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Old 03-11-2016, 03:31 AM   #15
daniel_f.
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Alright, unfortunally i havent got feedback for the modded file so im searching another tester with M54B25 and non-working LC.

Drop be a PM
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Old 03-11-2016, 09:30 AM   #16
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Let me know what feedback you need. PM sent.
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Old 03-13-2016, 02:18 PM   #17
matt270avian
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That file you sent also fixed it for me but reading the above comments about how it's just the neutral limit makes sense. I'm down to be a guinea pig if you want, PM incoming.
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Old 03-18-2016, 10:02 AM   #18
daniel_f.
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..
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Old 03-18-2016, 10:21 AM   #19
thecos
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Quote:
Originally Posted by daniel_f. View Post
Still no feedback, so ill release the protected files to whom may test!

PW -> PN

File is designed to ONLY work with manual M54B25 cars, make shure you must not flash a car with automatic gearbox with this software.

http://www22.zippyshare.com/v/1LE2yHjF/file.html
Thanks. Will flash and report.
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Old 03-19-2016, 04:40 PM   #20
thecos
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Quote:
Originally Posted by daniel_f. View Post
Still no feedback, so ill release the protected files to whom may test!

PW -> PN

File is designed to ONLY work with manual M54B25 cars, make shure you must not flash a car with automatic gearbox with this software.

http://www22.zippyshare.com/v/1LE2yHjF/file.html

Daniel, what is the password?

Last edited by thecos; 03-19-2016 at 04:41 PM.
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