Northern's Sterlingsilber M52 Turbo 325is

[Northern]

Oh, also apparently I'm buying another M52/ZF/driveshaft tomorrow. $350 for the whole shebang is too tempting to pass.

[Northern]

Apparently they know where the location for the VSS modifier is in MS41.1, but they just haven't updated the definitions file yet.

I managed to convert a 41.1 ECU into an M3 41.2 ECU tonight by flashing an M3 256kb file, and then an M3 24kb partial file that I cut and pasted 328i maps into, along with emissions deletes. I then re-read the full 256kb file and the 24kb "tune" file to compare them against what I flashed.

The 256kb file is quite different, but for the most part it just seems like it's the stuff from the modified 24kb file, except the table for Vanos activation under heavy load is all zeroed (?). The 24kb partial section shows up right, so hopefully this isn't actually an issue.

We will find out tomorrow I guess.

[Sh3rpak!ng]

I'm really not sure what types of signals ABS vs diff use. I don't know how you'd tap into the ABS to try to replicate what the E36 does, or if you'd need to condition that signal somehow. It's pretty easy to change the value in romraider to make up for the difference though, and I feel like they'll find the location of that value on the 328 ECU soon.

I just asked in the VSS thread on romraider, maybe someone already knows.

Yea, I am pretty much 100% sure its not that simple haha

subbed for progress and information

[Northern]

Hmmm that's very interesting. So you could potentially substitute the vss signal from the diff for the vss signal that the e36 uses from the wheel sensor? or am I again over simplifying? (are they the same signal type etc?)

I'm really not sure what types of signals ABS vs diff use. I don't know how you'd tap into the ABS to try to replicate what the E36 does, or if you'd need to condition that signal somehow. It's pretty easy to change the value in romraider to make up for the difference though, and I feel like they'll find the location of that value on the 328 ECU soon.

I just asked in the VSS thread on romraider, maybe someone already knows.

[spiDmang]

^ that definitely makes sense to me. I feel lucky to have suck slack emissions laws. All they do is look to see if the cat looks like it's there, and that's only if the car is 1991 or newer.

ya, WA is super lax as well. its nice that we don't even have to do emissions after 25 years....so my s50 swap was really easy to get registered

[Northern]

^ that definitely makes sense to me. I feel lucky to have suck slack emissions laws. All they do is look to see if the cat looks like it's there, and that's only if the car is 1991 or newer.

[spiDmang]

I am a fan of OBD2 except that here in California my swap will be impossible to make street legal if I stay with OBD2, hence why I converted back to OBD1.

you're the exception, Simon. Otherwise OBD2 > OBD1

[2mAn]

I am a fan of OBD2 except that here in California my swap will be impossible to make street legal if I stay with OBD2, hence why I converted back to OBD1.

[Sh3rpak!ng]

Yeah for sure! I think cosmetic/bodywork is going to be coming up soon. fenders/quarter panel trunk pocket/sunroof are all in rough shape right now.

Yikes, sounds like fun! Though, even if it's a lot of work, cosmetic work gives a lot of satisfaction when done right

If people knew, then yeah for sure. r3v seems to be stuck in the mid 2000's when converting to OBD1 was the way to go, money wise and power wise, but its pretty much the opposite now. People just don't seem to get it.

LOL I agree and truly don't understand this OBD2 was a piece of cake with all the stuff deleted from the DME - probably winds up easier than OBD1 conversion since there's less modification

I'm not 100% sure it's an abs signal, but I remember reading it somewhere. Also the 5.333 * the 9 tooth diff wheel on the e30 = 48, which is also the abs ring count for the donor car.

Hmmm that's very interesting. So you could potentially substitute the vss signal from the diff for the vss signal that the e36 uses from the wheel sensor? or am I again over simplifying? (are they the same signal type etc?)

I think This Thread was the one I was thinking of. Some stuff on the first page isn't really correct, but it gets to the point eventually.

Thanks, I'll check it out

wow, alot of good info in here as well as an amazing journey with your car! :up: much respect!

Agreed! I'm loving the information sharing. This is why I love r3v and the whole e30 community. Looking forward to updates!

[Northern]

^ Thanks!

[spiDmang]

wow, alot of good info in here as well as an amazing journey with your car! :up: much respect!

[Northern]

I think This Thread was the one I was thinking of. Some stuff on the first page isn't really correct, but it gets to the point eventually.

[Northern]

Ah yes, Dave knows his stuff! Would you mind forwarding me the email chain? At this point, I'm just compiling information. Don't have time to spend on really digging into the coding etc. quite yet since I'm still working on optimizing mechanicals and cosmetics :D I'll PM you my email if its cool with you

Yeah for sure! I think cosmetic/bodywork is going to be coming up soon. fenders/quarter panel trunk pocket/sunroof are all in rough shape right now.

Hmm, I didn't even know there was one :-P You might be right on that though it doesn't really make sense to me considering the amount of time most people spend on DIY everything mechanical I kinda feel like more people would get into it if the info was more accessible?

If people knew, then yeah for sure. r3v seems to be stuck in the mid 2000's when converting to OBD1 was the way to go, money wise and power wise, but its pretty much the opposite now. People just don't seem to get it.

Hmm I didn't know that although it would make sense. When I was studying the ETMs before I did my swap I saw a couple "speed" input signals mapped on the wiring but I just dismissed it as me not being adept enough to properly read the diagram!

I'm not 100% sure it's an abs signal, but I remember reading it somewhere. Also the 5.333 * the 9 tooth diff wheel on the e30 = 48, which is also the abs ring count for the donor car.

[Sh3rpak!ng]

Dave Markert (328ijunkie) from Markert Motor Works is the guy who figured a lot of this stuff out. I've got a good sized email thread back and forth with him about this stuff and he's always got an answer for me. I literally only know how to use the program put in front of me to turn some switches or do what someone tells me, whereas he's the one who figured a lot of stuff out himself, and actually tunes these cars. I'll glady answer what I can though.

Ah yes, Dave knows his stuff! Would you mind forwarding me the email chain? At this point, I'm just compiling information. Don't have time to spend on really digging into the coding etc. quite yet since I'm still working on optimizing mechanicals and cosmetics :D I'll PM you my email if its cool with you

The tuning section as it is is pretty slow. If more people are doing this, then it would definitely be cool, but I think most people are still sending their ECU's out for deletes/tunes.

Hmm, I didn't even know there was one :-P You might be right on that though it doesn't really make sense to me considering the amount of time most people spend on DIY everything mechanical I kinda feel like more people would get into it if the info was more accessible?

I think the diff speed signal is just for the cluster. I think the ECU takes abs signal from one of the wheels. I don't know why, just that its ~5.3x off what it should be when the E30 diff signal is used.

Hmm I didn't know that although it would make sense. When I was studying the ETMs before I did my swap I saw a couple "speed" input signals mapped on the wiring but I just dismissed it as me not being adept enough to properly read the diagram!

[Northern]

Holy shit man, thanks for the detailed answers! Much more than I was expecting! I didn't know there were individuals who've gotten this far into modifying code in the ECU. I know there are one or two other forum members who'd probably like to pick your brain or at least grab some tips from you.

Dave Markert (328ijunkie) from Markert Motor Works is the guy who figured a lot of this stuff out. I've got a good sized email thread back and forth with him about this stuff and he's always got an answer for me. I literally only know how to use the program put in front of me to turn some switches or do what someone tells me, whereas he's the one who figured a lot of stuff out himself, and actually tunes these cars. I'll glady answer what I can though.

I think there really needs to be a subforum added somewhere on r3v or bimmerforums for DIY ecu code modification

The tuning section as it is is pretty slow. If more people are doing this, then it would definitely be cool, but I think most people are still sending their ECU's out for deletes/tunes.

Edit: doesn't the e36 also grab speed signal from the diff like the e30 does? I literally just split open an e30 and e36 diff - same speed sensor ring on the diff gear. Or is it not that simple? I thought the sensors in the wheels where exclusively for traction control/abs giving individual wheel speeds so the traction/abs module can see if a wheel is rotating faster/slower in relation to the other wheels

I think the diff speed signal is just for the cluster. I think the ECU takes abs signal from one of the wheels. I don't know why, just that its ~5.3x off what it should be when the E30 diff signal is used.