More Findings About the M3 GT4 Suspension

rzm3 · 03-05-2010, 06:40 PM

Anyone want to give these babies a try?

Front Coil Over Kit (PN: 31308321857/31308321858)

MSRP $3617 each
Includes damper, main spring, helper spring, camber plate, and all other mounting hardware
2-way Ohlins strut (up-side-down mounted; remote reservior)
Spring rates offered: 914/1027/1142 lb/in

Rear Coil Over Kit (PN: 31308321633)

MSRP $1666 each
Includes damper, main spring, helper spring, and all other mounting hardware (except for top solid mount)
2-way Ohlins TTX36 Series (twin tube design with a solid piston, all valving inside piggy-back reservoir)
Spring rates offered: 743/857/971 lb/in (note: this is a coil over conversion, so the effective wheel rate is very close to the spring rates)

Sway Bars

Front bar is same as stock
Front links are different
Rear bar (PN: 33508321821) is 22.5 mm vs. 20 mm stock
Rear links are same as stock

Rear Sub-Frame

Utilizes solid bushes (PN: 33308321649)

Robwe46m3 · 03-06-2010, 03:25 AM

Where can these be ordered from???

STALKER · 03-06-2010, 10:54 AM

I find it interesting that they are mixing brands, and mixing mono and twin tube designs.

rzm3 · 03-06-2010, 12:20 PM

Correction: The front damper is indeed from Ohlins, an inverted strut design available also for Porsche GT3 front.

jml · 03-06-2010, 01:56 PM

I wonder what's on the GTS.

mastek · 03-06-2010, 03:40 PM

What else is required for the rear coilover conversion?
What parts?

aajami · 03-06-2010, 04:37 PM

Quote:

Originally Posted by jml

I wonder what's on the GTS.

25mm adjustable coilovers (at least, I think they're coilovers) by SACHS.

jml · 03-06-2010, 05:28 PM

Quote:

Originally Posted by aajami

25mm adjustable coilovers (at least, I think they're coilovers) by SACHS.

Cool, can't wait to see the parts and the price. Based on the much lower than expected cost of the Ohlins units on the GT4, I have high hopes for the GTS units.

bunnn · 03-06-2010, 07:27 PM

these arent from BMW is it?

Edit: nvm, found the thread about this in General Discussion...

aus · 03-07-2010, 01:06 AM

Do you need that brace piece for the rear coils?

e46e92love · 03-07-2010, 02:10 AM

Damn, 10k+ just for coil overs.....damn. I thought the GTS had an edc system, no? If so, the EDC system on a non-GTS //M3 would need to be reprogrammed to use these.

Cheers,
e46e92

rzm3 · 03-07-2010, 11:32 AM

Quote:

Originally Posted by mastek

What else is required for the rear coilover conversion?
What parts?

The only other thing is the top mount (Turner sells them) and proper structural support (i.e. brace, roll cage). Though quite a few people with E46 M3 have done a rear coilover conversion w/o any additional structural support, and I haven't heard of any problems.

aajami · 03-07-2010, 11:56 AM

Quote:

Originally Posted by e46e92love

Damn, 10k+ just for coil overs.....damn. I thought the GTS had an edc system, no? If so, the EDC system on a non-GTS //M3 would need to be reprogrammed to use these.

Cheers,
e46e92

The GTS doesn't have EDC.

mastek · 03-08-2010, 06:26 PM

Quote:

Originally Posted by aajami

The GTS doesn't have EDC.

he's prolly thinking ZCP

KonigsTiger · 03-08-2010, 07:01 PM

Nice set up indeed!!!!

mastek · 03-08-2010, 08:03 PM

Quote:

Originally Posted by rldzhao

The only other thing is the top mount (Turner sells them) and proper structural support (i.e. brace, roll cage). Though quite a few people with E46 M3 have done a rear coilover conversion w/o any additional structural support, and I haven't heard of any problems.

hmm -- I wonder how the rear suspension dynamic geometry copes with the springs being further out towards the wheel then in OE form?

So you are sure there are no other components to replace or modify to fit this rear coilover kit?

If not, that is very cool ... cause it took alot more to convert the e36 and e46 rear to accept a true coilover.

e46e92love · 03-08-2010, 09:19 PM

Quote:

Originally Posted by mastek

he's prolly thinking ZCP

No I was thinking GTS and just brain farted......

on me.....

Cheers,
e46e92

Robwe46m3 · 03-11-2010, 12:39 PM

how effective would this suspension be on a standard E92 M3 coupe? Does the fact that the gt4 weighs a few hundred pounds less make this less than ideal for the heftier standard coupe?

rzm3 · 03-11-2010, 08:55 PM

Quote:

Originally Posted by Robwe46m3

how effective would this suspension be on a standard E92 M3 coupe? Does the fact that the gt4 weighs a few hundred pounds less make this less than ideal for the heftier standard coupe?

With the price and available spring rate, this should only be used for serious racers. The GT4 is a few hundred pounds lighter, but you can easily choose stiffer springs based on your needs. The GT4 shocks are adjustable and should work with any reasonable amount of spring rates for the M3.

RickyBobby · 03-11-2010, 09:21 PM

Where did you get the oem rear sway bar info? I've seen listings show it as 22.8mm not 20mm

rzm3 · 03-11-2010, 09:35 PM

Quote:

Originally Posted by RickyBobby

Where did you get the oem rear sway bar info? I've seen listings show it as 22.8mm not 20mm

According to BMWfans.info...

http://bmwfans.info/parts/catalog/E9...abilizer_rear/

RickyBobby · 03-23-2010, 10:44 PM

Quote:

Originally Posted by rldzhao

According to BMWfans.info...

http://bmwfans.info/parts/catalog/E9...abilizer_rear/

Looks like we were both right. The e93 has thicker bars.
http://www.realoem.com/bmw/showparts...11&hg=33&fg=45

03-05-2010, 06:40 PM	#1
rzm3 Moderator 673 Rep 4,737 Posts Drives: E92 M3 Join Date: Aug 2007 Location: USA iTrader: (18)	More Findings About the M3 GT4 Suspension Anyone want to give these babies a try? Front Coil Over Kit (PN: 31308321857/31308321858) MSRP $3617 each Includes damper, main spring, helper spring, camber plate, and all other mounting hardware 2-way Ohlins strut (up-side-down mounted; remote reservior) Spring rates offered: 914/1027/1142 lb/in Rear Coil Over Kit (PN: 31308321633) MSRP $1666 each Includes damper, main spring, helper spring, and all other mounting hardware (except for top solid mount) 2-way Ohlins TTX36 Series (twin tube design with a solid piston, all valving inside piggy-back reservoir) Spring rates offered: 743/857/971 lb/in (note: this is a coil over conversion, so the effective wheel rate is very close to the spring rates) Sway Bars Front bar is same as stock Front links are different Rear bar (PN: 33508321821) is 22.5 mm vs. 20 mm stock Rear links are same as stock Rear Sub-Frame Utilizes solid bushes (PN: 33308321649) Attached Images Last edited by rzm3; 03-06-2010 at 12:37 PM..
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03-06-2010, 03:25 AM	#2
Robwe46m3 Banned 16 Rep 193 Posts Drives: 2010 E92 Ruby Blk M3 Individua Join Date: Jul 2009 Location: 2010 Olymipiads iTrader: (0)	Where can these be ordered from???
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03-06-2010, 10:54 AM	#3
STALKER Brigadier General 169 Rep 3,831 Posts Drives: 997.2 GT3, Golf R Join Date: Feb 2009 Location: Toronto, ON iTrader: (5)	I find it interesting that they are mixing brands, and mixing mono and twin tube designs. __________________
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03-06-2010, 12:20 PM	#4
rzm3 Moderator 673 Rep 4,737 Posts Drives: E92 M3 Join Date: Aug 2007 Location: USA iTrader: (18)	Correction: The front damper is indeed from Ohlins, an inverted strut design available also for Porsche GT3 front. Last edited by rzm3; 03-06-2010 at 12:36 PM..
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03-06-2010, 01:56 PM	#5
jml Major 128 Rep 1,144 Posts Drives: X5M, GT3RS, GT4 Join Date: Dec 2008 Location: Austin, TX iTrader: (3)	I wonder what's on the GTS.
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03-06-2010, 03:40 PM	#6
mastek e36s54, e70x5d 151 Rep 1,723 Posts Drives: slow Join Date: Aug 2008 Location: Los Angeles, CA iTrader: (15)	What else is required for the rear coilover conversion? What parts?
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03-06-2010, 07:27 PM	#9
bunnn Colonel 86 Rep 2,266 Posts Drives: like a grandma Join Date: May 2009 Location: Toronto iTrader: (12)	these arent from BMW is it? Edit: nvm, found the thread about this in General Discussion... __________________ Cheers Ben Last edited by bunnn; 03-06-2010 at 09:15 PM..
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03-07-2010, 01:06 AM	#10
aus Major General 892 Rep 9,032 Posts Drives: Odysse Join Date: Jul 2005 Location: Seal Beach, CA iTrader: (10)	Do you need that brace piece for the rear coils? __________________ Let me get this straight... You are swapping out parts designed by some of the top engineers in the world because some guys sponsored by a company told you it's "better??" But when you ask the same guy about tracking, "oh no, I have a kid now" or "I just detailed my car." or "i just got new tires."
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03-07-2010, 02:10 AM	#11
e46e92love Brigadier General 236 Rep 3,303 Posts Drives: e92 ///M3; X3 (wife's) Join Date: Nov 2007 Location: The East Side of Things iTrader: (0)	Damn, 10k+ just for coil overs.....damn. I thought the GTS had an edc system, no? If so, the EDC system on a non-GTS //M3 would need to be reprogrammed to use these. Cheers, e46e92 __________________ "...it's not about the money and not about the brand of the car, it's about handling,performance and passion......And that, no other car has all together like an M3........when you talk about the most complete car the M is invincible." --Tony Kanaan.
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03-08-2010, 07:01 PM	#15
KonigsTiger Racying Dynamics 118 Rep 4,391 Posts Drives: E92M3 RS46 Club Sport, others Join Date: Jan 2008 Location: Dweller iTrader: (0)	Nice set up indeed!!!! __________________ ==================================================
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03-11-2010, 12:39 PM	#18
Robwe46m3 Banned 16 Rep 193 Posts Drives: 2010 E92 Ruby Blk M3 Individua Join Date: Jul 2009 Location: 2010 Olymipiads iTrader: (0)	how effective would this suspension be on a standard E92 M3 coupe? Does the fact that the gt4 weighs a few hundred pounds less make this less than ideal for the heftier standard coupe?
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03-11-2010, 09:21 PM	#20
RickyBobby Captain 108 Rep 697 Posts Drives: M3 Join Date: Mar 2008 Location: NorCal iTrader: (3)	Where did you get the oem rear sway bar info? I've seen listings show it as 22.8mm not 20mm
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