Z4MR suspension refresh

MadGus · 01-17-2021, 05:32 PM

Hey folks. Swapping original front springs onto Bilstein B6s, and have a question about how to position the spring on the lower pad above the strut plate.

Here's how the spring is positioned on the passenger side, which I have copied onto the new driver's side strut.

Is this placement correct?

Steeler · 01-17-2021, 07:16 PM

If I remember correctly I bottomed the end of the spring against the stop on the isolator.
The spring coil began to rise at the step in the seat and rubber, so made sense to me to do it that way.

MadGus · 01-17-2021, 08:08 PM

Quote:

Originally Posted by dbarton62

If I remember correctly I bottomed the end of the spring against the stop on the isolator.
The spring coil began to rise at the step in the seat and rubber, so made sense to me to do it that way.

Thanks, dbarton. Do you mean that you lined up the end of the spring with where my green arrow is pointing?

When I tried pushing the end of the spring to the green arrow, the bottom rung of the coil hung over the side of the strut plate and the spring didn't want to sit down fully on the other side. Lined up as my pic shows it, it stays lined up all the way around.

Steeler · 01-17-2021, 08:46 PM

From Pelican parts diy page. Disregard the blue arrow.
Looks like the Spring is not bottomed out against the isolator stop

MadGus · 01-18-2021, 05:06 AM

Quote:

Originally Posted by dbarton62

From Pelican parts diy page. Disregard the blue arrow.
Looks like the Spring is not bottomed out against the isolator stop

Thx, dbarton. That's exactly what my spring looked like when I lined it up that way. Guess pelican has it right (which is not a surprise)!

MadGus · 01-18-2021, 11:06 AM

Should the new strut mounts turn freely when everything is reassembled? I was going to torque the top lock nut down on my passenger strut and noticed that the mount doesn't rotate.

Thinkin I messed something up on reassembly.

Appreciate any thoughts...

MadGus · 01-18-2021, 11:27 AM

Quote:

Originally Posted by MadGus

Should the new strut mounts turn freely when everything is reassembled? I was going to torque the top lock nut down on my passenger strut and noticed that the mount doesn't rotate.

Thinkin I messed something up on reassembly.

Appreciate any thoughts...

Never mind! Mount doesn't turn when spring is released from compression tool...

But it is important to have the mount bolts lined up before you release the spring!

thielepr · 02-05-2021, 08:26 PM

How was the outcome? How do you like it?

MadGus · 02-08-2021, 09:02 AM

Quote:

Originally Posted by thielepr

How was the outcome? How do you like it?

Should have done this when I bought the car. All four old shocks could be compressed by hand with virtually no rebound!

Car handles much better now, and feels more "planted."

racerbruce · 02-08-2021, 12:02 PM

Quote:

Originally Posted by MadGus

Should have done this when I bought the car. All four old shocks could be compressed by hand with virtually no rebound!

Car handles much better now, and feels more "planted."

Awesome!
it makes such an incredible difference. I did this same conversion to Bilstein B6's and Eibach Pro-Kit springs in Q1 2017; I love the 3/4-7/8 in front drop and the 3/8-1/2 in rear drop; I also replaced the OEM front control arms with the high performance Lemforder ZHP performance front control arms and new OEM FCAB's and all new shock pads, guide supports, shock bump stops, etc; it is STIFF and handles like a freakin' race-kart....it is entirely flat in corners. I did this upgrade at 62K miles.

How many miles on your Z4MR when you upgraded??

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MadGus · 02-08-2021, 01:08 PM

61k on her at upgrade... couple hundred more now. :-)

racerbruce · 02-08-2021, 02:43 PM

Quote:

Originally Posted by MadGus

61k on her at upgrade... couple hundred more now. :-)

We did our suspension upgrade(s) within 1K miles of each other.

elerner61 · 04-14-2021, 01:27 PM

Madgus or Racerbruce, do you have the torque values for the fasteners involved in the front and rear shock replacement? I'd appreciate it if you could share. Much thanks.

MadGus · 04-14-2021, 02:30 PM

Elerner - here's a link I found helpful

https://www.pelicanparts.com/techart...eplacement.htm

elerner61 · 04-16-2021, 03:24 PM

Quote:

Originally Posted by MadGus

Elerner - here's a link I found helpful

https://www.pelicanparts.com/techart...eplacement.htm

Yes thanks, I've seen that and will be referencing it for the work but there are no torque values there. From BMW Workshop Manuals (TIS excerpts) I've identified the fasteners and from another online post I found the Torque Values. Really wish that NEWTIS wasn't taken down by BMW.

31 31 1AZ Strut pivot mount (3 nuts to strut tower): 34 Nm
31 31 2AZ Strut to pivot mount (1 large nut): 64 Nm*
31 21 4AZ The three bolts to hub carrier: 81 Nm**
31 35 5AZ End links connecting strut: 58Nm

https://workshop-manuals.com/bmw/z_s...(m_r/page_895/

01-17-2021, 05:32 PM	#1
MadGus Private First Class 80 Rep 102 Posts Drives: 2006 Z4MR Join Date: Apr 2019 Location: Virginia iTrader: (0) Garage List 2006 BMW Z4MR [0.00]	Z4MR suspension refresh Hey folks. Swapping original front springs onto Bilstein B6s, and have a question about how to position the spring on the lower pad above the strut plate. Here's how the spring is positioned on the passenger side, which I have copied onto the new driver's side strut. Is this placement correct? Attached Images
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01-17-2021, 07:16 PM	#2
Steeler Colonel 2429 Rep 2,704 Posts Drives: Built not Bought 04 Z4 VF Join Date: Feb 2013 Location: Kitchener Ontario Canada iTrader: (2)	If I remember correctly I bottomed the end of the spring against the stop on the isolator. The spring coil began to rise at the step in the seat and rubber, so made sense to me to do it that way. __________________ W2A Intercooled Vortech V3Si, custom ducting, Alpha N, 60# Bosch,2.62 pulley, multi port WMI, Severn Tuning(pokeybritches), Tial, magnaflow,SS race muffler, 42 design,3.91LSD, H&R, Hotchkis,ST coils,Konis, Megan camber arms, AKG SS, Nylon mounts, Poly bushings, Carbon interior, CF Aero.APEX
	Appreciate 1 MadGus79.50 Quote

01-17-2021, 08:46 PM	#4
Steeler Colonel 2429 Rep 2,704 Posts Drives: Built not Bought 04 Z4 VF Join Date: Feb 2013 Location: Kitchener Ontario Canada iTrader: (2)	From Pelican parts diy page. Disregard the blue arrow. Looks like the Spring is not bottomed out against the isolator stop Attached Images __________________ W2A Intercooled Vortech V3Si, custom ducting, Alpha N, 60# Bosch,2.62 pulley, multi port WMI, Severn Tuning(pokeybritches), Tial, magnaflow,SS race muffler, 42 design,3.91LSD, H&R, Hotchkis,ST coils,Konis, Megan camber arms, AKG SS, Nylon mounts, Poly bushings, Carbon interior, CF Aero.APEX
	Appreciate 0 Quote

01-18-2021, 11:06 AM	#6
MadGus Private First Class 80 Rep 102 Posts Drives: 2006 Z4MR Join Date: Apr 2019 Location: Virginia iTrader: (0) Garage List 2006 BMW Z4MR [0.00]	Should the new strut mounts turn freely when everything is reassembled? I was going to torque the top lock nut down on my passenger strut and noticed that the mount doesn't rotate. Thinkin I messed something up on reassembly. Appreciate any thoughts...
	Appreciate 0 Quote

02-05-2021, 08:26 PM	#8
thielepr Private First Class 21 Rep 110 Posts Drives: 06 Z4M, 11 M3, 17 230i Join Date: Nov 2015 Location: Greenville, SC iTrader: (0)	How was the outcome? How do you like it?
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02-08-2021, 01:08 PM	#11
MadGus Private First Class 80 Rep 102 Posts Drives: 2006 Z4MR Join Date: Apr 2019 Location: Virginia iTrader: (0) Garage List 2006 BMW Z4MR [0.00]	61k on her at upgrade... couple hundred more now. :-)
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04-14-2021, 01:27 PM	#13
elerner61 Major 157 Rep 1,107 Posts Drives: '07 Z4M Roadster Join Date: May 2011 Location: Mount Kisco, NY iTrader: (0)	Madgus or Racerbruce, do you have the torque values for the fasteners involved in the front and rear shock replacement? I'd appreciate it if you could share. Much thanks.
	Appreciate 0 Quote

04-14-2021, 02:30 PM	#14
MadGus Private First Class 80 Rep 102 Posts Drives: 2006 Z4MR Join Date: Apr 2019 Location: Virginia iTrader: (0) Garage List 2006 BMW Z4MR [0.00]	Elerner - here's a link I found helpful https://www.pelicanparts.com/techart...eplacement.htm
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