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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > Bimmerlabs 330i Tune DIY Step by Step



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      10-03-2021, 12:19 PM   #705
Biginboca
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Quote:
Originally Posted by PhaseP View Post
In terms of galvanic corrosion with magnesium, Titanium is worse than steel or stainless steel. The closer the two metals in contact in this chart the less galvanic corrosion will happen. And titanium and magnesium is very apart from each other (about 1.5 volt difference between the too):



For galvanic corrosion to happen there has to be electrolyte solution between two dissimilar metals. Road salt mixed with rain, snow slush is one.
Because the bolt heads are pointing down in this case, the salted water will drain won't not stay. Also there is aluminum between the magnesium and the bolt's exposed head with these covers. That may be reducing the effect too.
The stainless steel bolts may have some plating on them that would reduce the contact and also corrosion as well, but it is not specified.

Overall it is better to use aluminum bolt, I think.
Thanks for that. I ordered a couple different aluminum bolts to try, the oem bmw ones (50mm) posted on the last page that would need some modification to work, and the 40mm ones I posted also. Definitely going to use aluminum bolts.
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      10-05-2021, 11:59 AM   #706
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Originally Posted by hassmaschine View Post
when I can reliably identify the variants of GM1912 I could put it back up. It's not even that flashing the wrong file will permanently brick the TCU, but I don't have time to help everyone troubleshoot. So if it's not completely reliably going to work I don't want to post it.
Is there a way to contribute to GM1912 tune in order to make it happen?
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      10-06-2021, 08:44 AM   #707
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Is there a way to contribute to GM1912 tune in order to make it happen?
Few things need to happen,

1. Need to get the TCU to someone that can pull it apart, cut it loose from it's epoxy sarcophagus attach a BDM to read out the memory. Then some one needs to develop a way to bypass the RSA projection scheme. Probably end up bricking a few units in the process.
2. You then need to reverse engineer the program code and sort out the maps and functions to write custom tunes. Would be easier if a Damos or Al2 file was available but I've never seen one.

In short you are talking about hundreds of hours to crack, reverse engineer, create and then test new tunes. Just not worth the effort. Xhp has the resources but they've already come out and said they were not interested.
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      10-06-2021, 09:19 AM   #708
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Reading the files isn't a problem (I think I already have a couple dumps, and in any case you can just export the .0pa/.0da files). The big problem is the program is compressed - there's no way to disassemble it unless you can figure out how to decompress the data. That makes an RSA signature bypass impossible, so unless you have a supercomputer that can brute force they key before the heat death of the universe, a custom calibration isn't happening.

I also don't own or know anyone with the GM trans, so I don't have much personal motivation to dedicate to it. Heck, I barely have time to work on my own car these days, lol.

you're free to flash the euro 330i tune yourself using WinKFP expert mode.
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      10-06-2021, 10:25 AM   #709
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Originally Posted by hassmaschine View Post
you're free to flash the euro 330i tune yourself using WinKFP expert mode.
But is it available somewhere? How do I know if my GM1912 is supported?
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      10-06-2021, 10:55 AM   #710
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If your car is 2008 or older the calibration from the x3 3.0si works very well. That's what I used when hass put it up. I haven't tried a zb from a euro 330i, would need to figure out which euro 330 has the same tcu and transmission and get a file from it
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      10-06-2021, 12:23 PM   #711
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Originally Posted by E92_William View Post
If your car is 2008 or older the calibration from the x3 3.0si works very well. That's what I used when hass put it up. I haven't tried a zb from a euro 330i, would need to figure out which euro 330 has the same tcu and transmission and get a file from it
My car is 328i 2009/09 so I guess its not applicable to my transmission...
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