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E85 / E86 Z4 (2003-2008)
E85 Z4 Roadster, E86 Z4 Coupe, E85 Z4 M Roadster, and E86 Z4 M Coupe talk with our BMW gurus here.

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  #1776  
Old 06-02-2012, 04:37 PM
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Palantirion Palantirion is offline
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Mein Auto: 2003 M5-S2, 2002 540iT-S2
I posted a separate thread about bushings here: http://www.bimmerfest.com/forums/sho...48#post6872448 but we can discuss my options in this thread too.
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  #1777  
Old 06-03-2012, 09:04 AM
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pal pal is offline
S54=Living on the Edge
Location: New Jersey
 
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Replied there as well - I switched rears to Rogue black poly RTABs last year and have been happy with them. Rear seems more solid under load - esp corner exits e.g., downhill right/left handers that really load up the outside rear.

Used new OE FCABs for the front as I could not find an offset bushing insert for our cars.
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Texas Mile (March, 2010): 155.4 mph
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  #1778  
Old 06-15-2012, 04:30 PM
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Palantirion Palantirion is offline
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Location: Southern CA
 
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Mein Auto: 2003 M5-S2, 2002 540iT-S2
Scatha, at Coast MotorWerk's Huntington Beach location:


Because...




According to Jay at Ground Control, who examined full-res pics I sent him, this was not a sudden failure. He told me it looks like the bar cracked slightly, that this crack lengthened over time and then finally split quickly. The latter I can confirm noticing at the last OCRC event. As to the slow decay of spring resistance over time, I believe this was responsible for for the lag in rear end set response over the past year or so that I had thought due to failing RTABs. Jay was great to work with and sent me out a new bar free of charge, with a UPS return label so they can examine the failed bar to see how it happened.

So I had already ordered Rogue Engineering (blue) RTABs. I will disclaim now that they did not recommend the blues for a street driven vehicle, because the blacks are a little softer and don't transmit as much road noise or vibration. Scatha is not at all quiet, between the noisy TCK shocks, monoball sway bar end links and r-comp tires, so I saw no harm in going for the stiffer bushing.


New sway bar installed:


Note sway bar clearance with RTAB removed:


This is beyond "Duke's of Hazard" travel range. Note the rubbing marks on the axle shafts. This was from several years ago at BMS when we tried to set the bar to it's stiffest setting. It looked like it barely cleared on the rack, but rubbed slightly during test driving. So we set it back to the middle. In that pic you can also see the paint scratched off the lower arm from the broken sway bar's dangling end link.

Any idea whose product these are??? I don't. And they aren't marked. I wasn't at BMS when these were installed. I know BMS was making their own at the time, but the finished version of those was green. Anyway, these seem to have done their job ok. Still in good condition.


Removing the old RTABs. The technician Brandon (who was great btw) told me these were replaced from original, as they are a BMW part used for replacement not during factory installation. No doubt changed during the installation of the limiter bushings.


Bushings seem fine.


Rogue bushings installed:


Collar back on:


Back on the ground:


Alignment:


The car feels tight as hell now, which should surprise no one. I haven't had a chance to drive it hard on an interesting road yet, but expect to this weekend.

The next update will involve using commercial floor polish on the paint. Stay tuned for craziness.
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  #1779  
Old 06-16-2012, 07:58 AM
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tnsbruce tnsbruce is offline
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Location: On the rev limiter
 
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Mein Auto: '08 Z4M and '03 530i
I will need to inspect my sway bars. I am also toying with the idea of having RRT fabricate a bar for me that would allow full adjustment and clear the half shafts. Are you still using the original heim joints on the sway bar links? I had to replace mine front and rear due to pre-mature failure.
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================================================== ================================================== ===
CDV Delete | CSL Wheels | Super Sprint Exhaust | Strong Strut | RE-11's | Cosmetic Blackout | Super Sprint Stepped Headers
3.91 diff | Ground-Control Sway Bars | RRT Rear Control Arms | UUC Short Shifter | KW Club Sport | StopTech BBK |

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  #1780  
Old 06-16-2012, 02:46 PM
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Palantirion Palantirion is offline
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Quote:
Originally Posted by tnsbruce View Post
I will need to inspect my sway bars. I am also toying with the idea of having RRT fabricate a bar for me that would allow full adjustment and clear the half shafts. Are you still using the original heim joints on the sway bar links? I had to replace mine front and rear due to pre-mature failure.
-Ground Control supplied new end links/heim joints with the new bar. The old ones seem to have no noticeable play in them. The end links are adjustable and it seems fairly straightforward to make the bar arms clear the half shafts.

p.s. There seems to be a slight increase in rear noise over bots dots and expansion joints from the blue RTABs. On my car it's barely noticeable, on a totally stock Z4 with OEM tires the blues would probably be quite bothersome.
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Last edited by Palantirion; 06-16-2012 at 02:47 PM.
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  #1781  
Old 06-17-2012, 07:15 AM
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pal pal is offline
S54=Living on the Edge
Location: New Jersey
 
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Quote:
Originally Posted by Palantirion View Post
p.s. There seems to be a slight increase in rear noise over bots dots and expansion joints from the blue RTABs. On my car it's barely noticeable, on a totally stock Z4 with OEM tires the blues would probably be quite bothersome.
I have the black RTABs on my Z4MC and can confirm that they are quiet even after about a year in there. Nice OEM+ improvement IMHO.
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Texas Mile (March, 2010): 155.4 mph
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  #1782  
Old 09-07-2012, 06:24 PM
Spreadsheet Spreadsheet is offline
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Location: Bixby
 
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Mein Auto: Z4MC
Those white bushings look like Rogue Engineering's RTAB Limiting bushings, also sold at Vorshlag too. I had looked into them and once I have to replace the RTAB, then I plan on adding them. Seemed better application than Turner Motorsports aluminum version.

Hope this helps.
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  #1783  
Old 01-20-2013, 02:07 PM
Andy1GP Andy1GP is offline
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Location: South Africa
 
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Mein Auto: '08 Z4MC '04 E46 330d
Very impressive and detailed thread! Well done and hats off for taking the time and effort. I applaud you.

I'm still reading through your extremely lengthy and entertaining thread. Just wanted to subscribe for future reference. Will introduce myself soon
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  #1784  
Old 01-30-2013, 12:27 PM
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Palantirion Palantirion is offline
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Originally Posted by Andy1GP View Post
Very impressive and detailed thread! Well done and hats off for taking the time and effort. I applaud you.

I'm still reading through your extremely lengthy and entertaining thread. Just wanted to subscribe for future reference. Will introduce myself soon
-Thanks Andy, nice to meet you.
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  #1785  
Old 02-10-2013, 07:52 AM
Machinereplica Machinereplica is offline
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Mein Auto: 09 Challenger SRT8 6M
I've only read through to page 37, but this thread has definitely helped me make up my mind. When I return home from Afghanistan I'm selling my Challenger SRT8 6m and getting a Z4M Roadster.
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  #1786  
Old 04-16-2013, 08:50 AM
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Palantirion Palantirion is offline
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Location: Southern CA
 
Join Date: Jun 2006
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Mein Auto: 2003 M5-S2, 2002 540iT-S2
Some pics from her Art Car thread, showing the hail that Scatha endured back in February.






And she got her picture in Car&Driver Magazine, due to a letter I wrote about the Blastolene guys and their take on art cars:


A few more weeks until Bimmerfest 2013! I'll be doing another casual painting demo on Scatha, changing some midtone colors on the driver's side. Hope to see some of you there.

And some light reading, as pertaining to future Scatha mods (no, she isn't done yet):
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  #1787  
Old 05-29-2013, 02:03 PM
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Palantirion Palantirion is offline
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Mein Auto: 2003 M5-S2, 2002 540iT-S2
My Bimmerfest writeup: http://www.bimmerfest.com/forums/sho...28#post7617328
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  #1788  
Old 06-11-2013, 10:46 PM
Hoops432 Hoops432 is offline
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Mein Auto: '06 M Coupe, '08 K12S
Hey Earl. What's your current status on heat issues/limp mode on track days? A few of us throwing round radiator upgrade ideas here:
http://www.zpost.com/forums/showthre...=847633&page=3
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  #1789  
Old 11-21-2013, 09:45 PM
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Palantirion Palantirion is offline
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Originally Posted by Hoops432 View Post
Hey Earl. What's your current status on heat issues/limp mode on track days? A few of us throwing round radiator upgrade ideas here:
http://www.zpost.com/forums/showthre...=847633&page=3
-I haven't tracked it in a while, due to scheduling limitations, but back when I was tracking her a lot I would say that heat issues depended mostly on the track layout. Much more than ambient air temperature. That said I found that in all three situations I am thinking of I ended up "driving around" the problem by short shifting slightly or taking a couple turns 1 gear up. This not only fixed the problem in those situations, but also didn't lose me time due to the strong midrange torque of my ESS CFR500. The most vivid example I have is Cal Speedway, where I switched from using 3rd in the last three turns (near top RPM, steady throttle) to using 4th. In either case I hit 120mph exactly on the start/finish line so no time was lost and it was easier on the drivetrain.


In more recent news I had a car cover made. Not sure if that counts as a "mod". Details here: http://www.bimmerfest.com/forums/sho...01#post7971601
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