M3 Torsional Rigidity specs?

OldFanatic · Sun, Jul-08-2012, 11:22:16 PM

^ interesting...now a third number for the convertible?

so 11,500 Nm for the e46 convertible and only 12,500 Nm for the e46 coupe that has a rigid roof. something sure seems off with those numbers.

Tarmac_E36_M3 · Mon, Jul-09-2012, 12:18:47 AM

Note to self.... Weld a piece of metal in the trunk pass through and get rear tower strut bar.

aznbo187 · Tue, Jul-10-2012, 05:09:32 PM

I'm curious also as far as actual numbers. I have the Mason rear strut bar that triangulates down to the subframe as well as a bolt in cage and my car feels fairly stiff. But, I wouldn't mind stiffer, haha.

5ABIVT · Tue, Jul-10-2012, 06:16:18 PM

Interesting stuff I never considered a rear bar. You guys notice the difference that much? Who else makes bars? Any popular ones?

Envyscorpio · Tue, Jul-10-2012, 07:42:06 PM

Dinan rear strut made my car quieter when going on a ramp. So I guess it works! More rigid.

aznbo187 · Tue, Jul-10-2012, 09:42:04 PM

Quote:

Originally Posted by 5ABIVT

Interesting stuff I never considered a rear bar. You guys notice the difference that much? Who else makes bars? Any popular ones?

Mason. Hands down the best one, IMO.

SliM3 · Tue, Jul-10-2012, 10:33:59 PM

Cool and interesting topic. You guys are on it, which is why I enjoy this forum

What condition would equate to 12,500 Nm/deg of twisting force? Driving of a curb maybe? Not being a smart ass or anything, I just don't know.

MSpeedAddict · Tue, Jul-10-2012, 10:39:36 PM

Quote:

Originally Posted by aznbo187

I'm curious also as far as actual numbers. I have the Mason rear strut bar that triangulates down to the subframe as well as a bolt in cage and my car feels fairly stiff. But, I wouldn't mind stiffer, haha.

Pics? I'm getting this done I have seen a couple threads but more pics/info the better

aznbo187 · Wed, Jul-11-2012, 12:06:21 AM

Quote:

Originally Posted by MSpeedAddict

Pics? I'm getting this done I have seen a couple threads but more pics/info the better

I'll try to remember posting back here, but you may check my journal. I'll have it in there for sure at the next shoot.

terraphantm · Sun, Jul-15-2012, 05:05:34 AM

This document states the M3 does have increased rigidity compared to the non-M, but it does not reference actual numbers. You'd think the info is out there somewhere.

Sun, Jul-08-2012, 11:22:16 PM	#11
OldFanatic 17 yr BMWCCA Member Join Date: Jan 2011 Posts: 419 Reputation: 0 Location: Surf City, USA	Re: M3 Torsional Rigidity specs? ^ interesting...now a third number for the convertible? so 11,500 Nm for the e46 convertible and only 12,500 Nm for the e46 coupe that has a rigid roof. something sure seems off with those numbers. __________________ 2003 TiAg - OEM CSL WHEELS - OEM CSL BRAKES - AA SPORT TUNE - AA PULLEYS - AS 40% SSK- VCSL TRUNK - VCSL DIFFUSER - SUPERSPRINT EXHAUST - BMW PERFORMANCE CF STRUT BRACE - BILSTEIN PSS9s - GROUP N MOTORMOUNTS - BW INTAKE ELBOW - CF RACE LIP - SUNROOF DELETE - 4.10 DIFF - CSL RACK

Mon, Jul-09-2012, 12:18:47 AM	#12
Tarmac_E36_M3 If it ain't lightweight, it ain't the right weight. Join Date: Jul 2011 Posts: 3,002 In the garage: '95 BMW M3 '03 BMW M3 Reputation: 0 Location: LA/OC/SD	Re: M3 Torsional Rigidity specs? Note to self.... Weld a piece of metal in the trunk pass through and get rear tower strut bar. __________________ Current: 1969 Ford Mustang Coupe; 351w (5.8L) carb engine; Champion 4 row radiator; Edelbrock Performer RPM Intake Manifold; Edelbrock 750 CFM Carb; 15" Cragar Wheels; 215/60-15 front tires, 255/60-15 rear tires; Doug Tri-Y Headers; Custom 2.5" Dual Side Exit Exhaust w/Xpipe; MSD 6AL; Electric Fuel Pump; March Performance U/D Pulley Set; Monte Carlo Bar; 3200 lbs. 1995 M3; single 3" exhaust after cats; CF hood; Apex ARC-8 17x9" wheels; Conti DW 245 square; BC Racing Coilovers. SOLD: E46 M3 SMG; Intrax coilovers; ACPT CF DS; SS V1 Headers/Section 1; Zionsville Type 17 kit; VAC Ultra light pulley set; BMW MS 4.10; Evolve-R Tune; 2980 lbs.

Tue, Jul-10-2012, 05:09:32 PM	#13
aznbo187 MCLA Join Date: Sep 2009 Posts: 1,386 In the garage: '03 BMW M3 Reputation: 0 Location: West Hills, CA	Re: M3 Torsional Rigidity specs? I'm curious also as far as actual numbers. I have the Mason rear strut bar that triangulates down to the subframe as well as a bolt in cage and my car feels fairly stiff. But, I wouldn't mind stiffer, haha. __________________ MCLUB \| Los Angeles

Tue, Jul-10-2012, 06:16:18 PM	#14
5ABIVT Registered User Join Date: Sep 2011 Posts: 1,632 Reputation: 0	Re: M3 Torsional Rigidity specs? Interesting stuff I never considered a rear bar. You guys notice the difference that much? Who else makes bars? Any popular ones? __________________ "M3 Drivers have no friends" Jeremy Clarkson

Tue, Jul-10-2012, 07:42:06 PM	#15
Envyscorpio Registered User Join Date: Apr 2003 Posts: 517 Reputation: 0 Location: LA	Re: M3 Torsional Rigidity specs? Dinan rear strut made my car quieter when going on a ramp. So I guess it works! More rigid. __________________ [E34 520i \| E39 528i \| E46 M3 \| E90 M3 \| F25 X3]

Tue, Jul-10-2012, 10:33:59 PM	#17
SliM3 Registered User Join Date: May 2012 Age: 40 Posts: 359 In the garage: '06 BMW M3 E46 Reputation: 0 Location: Hotlanta	Re: M3 Torsional Rigidity specs? Cool and interesting topic. You guys are on it, which is why I enjoy this forum What condition would equate to 12,500 Nm/deg of twisting force? Driving of a curb maybe? Not being a smart ass or anything, I just don't know. __________________ ///M3 '06 Carbon Black "Do or do not do, there is no try"

Sun, Jul-15-2012, 05:05:34 AM	#20
terraphantm Registered User Join Date: Dec 2010 Posts: 2,240 In the garage: '05 BMW M3 Reputation: 0 Location: Here and there	Re: M3 Torsional Rigidity specs? This document states the M3 does have increased rigidity compared to the non-M, but it does not reference actual numbers. You'd think the info is out there somewhere. __________________ Last edited by terraphantm; Sun, Jul-15-2012 at 05:10:25 AM.

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