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      08-14-2015, 12:50 PM   #67
kychungkevin
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I was thinking the M Sport sway only because there are no other choices. But you sure Kartboy endlink will works with E90's sway on X1 with no side effects?


Quote:
Originally Posted by paradoxical3 View Post
The bigger the better rear bar, and I would leave the stock front. Dials out understeer this way.

Just note that the aftermarket and M3 bars will not fit with stock endlinks (you can install it, but it will clunk as the endlinks keep hitting because they are too long), but subaru kartboy STI endlinks fit.
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      08-14-2015, 01:01 PM   #68
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Quote:
Originally Posted by kychungkevin View Post
I was thinking the M Sport sway only because there are no other choices. But you sure Kartboy endlink will works with E90's sway on X1 with no side effects?
Of course. Any rear bar for the E90 will work. The X1 is just about all E90 xdrive underneath, but the endlink span is off...probably just a product of the original ride height.

Para can chime in, but stock 335 end links may work too?
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      08-14-2015, 01:58 PM   #69
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Edit: Found a definitive way to disable the e diff.

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      08-14-2015, 06:06 PM   #70
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Quote:
Originally Posted by PrematureApex View Post
Another thought...but first a question.

Is it true (as most claim), that the ediff is in fact off until you deactivate both DSC and DTC?

If that's true, perhaps another route is to code out DSC and DTC.

Edit, maybe that's not true afterall...

"BMW's Dynamic Stability Control (DSC) system ensures that the vehicle remains stable when taking bends, speeding up or braking on uneven road surfaces or in poor driving conditions. The Automatic Differential Brake (ADB-X) is part of this system. Using sophisticated electronics, it offers the same function as a mechanical differential brake - without any disadvantages arising from weight and loss of efficiency."
Never thought about coding out DSC and DTC entirely, honestly I never drive with them on so I would be willing to try that.

I also found a parameter called E84_AX_REF_DIFF_LOCK. Any idea what this is?

Check this out:

Quote:
If a wheel threatens to slip, it is individually braked: blocking momentum is directed to the wheel opposite, which thereby guarantees optimum drive power. When DSC or Dynamic Traction Control (DTC) is active, the engine power output is also adjusted.
If the sporting driver chooses to deactivate DSC or DTC, he still has the benefit of ADB-X, which then focuses on maximum forward drive and applies braking force only. A temperature control sensor ensures that the brakes do not overheat.
That is exactly what is killing me on the track.
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      08-14-2015, 06:07 PM   #71
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Quote:
Originally Posted by PrematureApex View Post
Of course. Any rear bar for the E90 will work. The X1 is just about all E90 xdrive underneath, but the endlink span is off...probably just a product of the original ride height.

Para can chime in, but stock 335 end links may work too?
Never tried stock end links from a 335i but they might work. We just used the subaru ones because we had them unused right there and they fit absolutely perfectly.
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      08-14-2015, 06:38 PM   #72
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Quote:
Originally Posted by paradoxical3 View Post
Never thought about coding out DSC and DTC entirely, honestly I never drive with them on so I would be willing to try that.

I also found a parameter called E84_AX_REF_DIFF_LOCK. Any idea what this is?
.
After some translating...it appears to be related to some aspect of performance control?

http://www.bmwclub.ru/vb/showthread.php?p=21281896


But anyway, if I'm you, I'm deactivating that and giving it a try on your next lapping session. If that's not doing it, then try setting Diff_Lock (if it's in the xdsc) to 0. BMW describes their e diff as an electronic locking diff...so it's certainly related to the locking aspect of the rear end.

Can't hurt anything by trying.
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      08-14-2015, 06:39 PM   #73
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Quote:
Originally Posted by paradoxical3 View Post
Never tried stock end links from a 335i but they might work. We just used the subaru ones because we had them unused right there and they fit absolutely perfectly.
I'm nearly certain they'll work. Our endlinks are too long as a result of the OE ride height difference.

I'll take a peek at my 135's rear endlinks and compare them to a set of WRX/STI endlinks I have lying around to be sure.
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      08-14-2015, 06:42 PM   #74
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Quote:
Originally Posted by PrematureApex View Post
After some translating...it appears to be related to some aspect of performance control?

http://www.bmwclub.ru/vb/showthread.php?p=21281896


But anyway, if I'm you, I'm deactivating that and giving it a try on your next lapping session. Then try setting Diff_Lock (if it's in the xdsc) to 0.

Can't hurt anything by trying.
I will be at Mid Ohio next friday for an a-solo open track day (track is hot all day) and then am running Saturday-Sunday with the CCA school so it will be a perfect opportunity to try it out.

I will report back, but if we could figure this out there are a lot of people who would benefit from it. I just spent the last hour googling it again and there are 20+ threads I found asking how to disable it with no definitive answers, and two or three people claiming they had but not posting how.
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      08-14-2015, 06:44 PM   #75
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I guess the question is, is the Performance Control instead of BMW ADB-X (like a higher level of it) or once I code out performance control, will ADB-x still remain?

It would be really interesting if in my car Diff_lock is set to off and performance control is set to on. I will check.
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      08-14-2015, 06:46 PM   #76
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Quote:
Originally Posted by paradoxical3 View Post
Never tried stock end links from a 335i but they might work. We just used the subaru ones because we had them unused right there and they fit absolutely perfectly.

Thank you Para and Premature!
Kartboy seem much better (stronger) than OEM M3 so I should go for that. I looked up your post about putting in M3 sway and you said it is a pain; what is the reason?
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      08-14-2015, 06:47 PM   #77
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Quote:
Originally Posted by kychungkevin View Post
Thank you Para and Premature!
Kartboy seem much better (stronger) than OEM M3 so I should go for that. I looked up your post about putting in M3 sway and you said it is a pain; what is the reason?
It is a pain because you have to drop the subframe in the rear. Labor will be $$$ if you are not doing it yourself. You might as well do the rear subframe bushings and any other rear suspension work you plan on while you are back there as it will save you lots of time and effort down the road.
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      08-14-2015, 06:48 PM   #78
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Quote:
Originally Posted by kychungkevin View Post
Thank you Para and Premature!
Kartboy seem much better (stronger) than OEM M3 so I should go for that. I looked up your post about putting in M3 sway and you said it is a pain; what is the reason?
You have to drop the rear subframe to remove/install the bar. It's not hard at all, but compared to most swaybar jobs, it takes more time.

That's why it makes sense to do the rear subframe bushings while you're back there.

Whitelines are the cheapest and easiest to install (2 piece poly vs. something you have to press in). Use the jack/torch method DIY to get the old ones out without any special tools.

http://www.topgearsolutions.com/whit...g-bmw-e90.html
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      08-14-2015, 06:50 PM   #79
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Quote:
Originally Posted by paradoxical3 View Post
It is a pain because you have to drop the subframe in the rear. Labor will be $$$ if you are not doing it yourself. You might as well do the rear subframe bushings and any other rear suspension work you plan on while you are back there as it will save you lots of time and effort down the road.
Dammit!
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      08-14-2015, 06:52 PM   #80
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Did ANY E90 come with an optional LSD anywhere in the world (maybe a 335is somewhere)? If so, we need to get their DSC dump and we'd 100% be able to shut it off. I believe people have done it without changing the VO.
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      08-14-2015, 06:54 PM   #81
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Quote:
Originally Posted by PrematureApex View Post
Did ANY E90 come with an optional LSD anywhere in the world (maybe a 335is somewhere)? If so, we need to get their DSC dump and we'd 100% be able to shut it off. I believe people have done it without changing the VO.
Not mechanical lsd I think, however 2007 335i had a strict open diff, not the e-diff programming. Could compare the parameters and see what is different to cause the locking behavior. For the 2007 cars when DSC is off, everything is off from what I have researched.
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      08-14-2015, 07:40 PM   #82
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Quote:
Originally Posted by PrematureApex View Post
After some translating...it appears to be related to some aspect of performance control?
It's set to aktiv on my non-M, if that helps you with anything.
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      08-14-2015, 08:13 PM   #83
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^^^Yeah, it's safe to say with diff and lock in it, it's related to the e-diff which you're certainly running.

If I had an ice-skating rink handy, I'd run out, shut it off and test it right now.

But I have been drinking...
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      08-14-2015, 08:21 PM   #84
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The F30 cars are much different than e series coding wise, right? Because the F30 has a port install option for a LSD.
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      08-14-2015, 10:42 PM   #85
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Quote:
Originally Posted by PrematureApex View Post
You have to drop the rear subframe to remove/install the bar. It's not hard at all, but compared to most swaybar jobs, it takes more time.

That's why it makes sense to do the rear subframe bushings while you're back there.

Whitelines are the cheapest and easiest to install (2 piece poly vs. something you have to press in). Use the jack/torch method DIY to get the old ones out without any special tools.

http://www.topgearsolutions.com/whit...g-bmw-e90.html

I already got the Whitelines! I was actually thinking if I want to do sway while doing the bushings. Now I know the answer!!
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      08-16-2015, 09:51 PM   #86
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Couple quick questions guys:

Para - Where did you see the KW V1 for just over a grand? I can't seem to find them for less than 1600 or so.

Regarding the Whitelines, are they lubricated (graphite impregnated?) or are they squeeky?

I am looking at the AC Schnitzer springs but wasn't planning on doing the struts. Now I am thinking of just going with the KW V1 if they can be found for around a grand.

The M3 rear bar has been on my list, so might as well do the bushings.

Also, Para and Apex, your both pretty you know...
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      08-17-2015, 07:54 AM   #87
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Quote:
Originally Posted by Shock96 View Post
Couple quick questions guys:

Para - Where did you see the KW V1 for just over a grand? I can't seem to find them for less than 1600 or so.

Regarding the Whitelines, are they lubricated (graphite impregnated?) or are they squeeky?

I am looking at the AC Schnitzer springs but wasn't planning on doing the struts. Now I am thinking of just going with the KW V1 if they can be found for around a grand.

The M3 rear bar has been on my list, so might as well do the bushings.

Also, Para and Apex, your both pretty you know...
They're simply poly bushings that you apply a bit of grease to when installing. No noises at all. It's not really a bushing that's subject to much movement beyond compression.
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      08-19-2015, 08:26 PM   #88
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Non-update, update. Rear Bilsteins will be in on Tues. Should be about an 30 minutes to toss them in and I'll post the results. I'll try them with stock length bumpstops first, then trim if still needed.

Looking forward to results.

After this, it's convincing wifey she wants a meth kit. I gave her some E85 the other day, and I think she's addicted...so perhaps it's an option.
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