Structural rigidity of e93

TotalPower · 07-21-2010, 11:17 AM

My question is about the strength of the roof on the e93.

When you drive on bumpy roads with the window down and your hand on the joint between the roof and the a pillar, you can feel a wiggle which wouldn't be there in the case of a sedan or couple. How can this be improved, if at all?

How much of the weight of the roof weight is in the arms and are they steel, iron, alum; how much of the weight is in the top panel, rear panel, back window?

I figure that the A pillars of the e93 are stiffer than those of the coupe or sedan for a few reasons, but in the event of a roll-over with the top up, do the C pillars hold up well? I know the Rear seats have integrated roll bars which probably do not fire with the roof up(?). How does the joint between the front and rear panel hold up?

deletedelete · 07-21-2010, 11:28 AM

I have no idea but I can only imagine their must be some safety standard in the event of the roll. But then I think of the ford explorer or whatever that had a paper like roof that collapsed on a few people.

vasillalov · 07-21-2010, 11:41 AM

This is common with most "wagons".

Try rear strut braces at the c-pilar. Look for something like this:

VTECaddict · 07-21-2010, 03:38 PM

The roof on the E93 is not designed to support the car. Rollover bars behind the rear headrests will pop up in the event of a rollover to support the car.

vasillalov · 07-21-2010, 04:23 PM

^^^

I apologize! I thought you guys were talking about wagons, but apparently, you are talking about convertables.

TotalPower · 07-21-2010, 05:15 PM

Quote:

Originally Posted by VTECaddict

The roof on the E93 is not designed to support the car. Rollover bars behind the rear headrests will pop up in the event of a rollover to support the car.

so regardless of a rollover the roll bars will fire?

g2artist · 07-21-2010, 05:18 PM

Yes

persian54 · 07-21-2010, 05:32 PM

Quote:

Originally Posted by VTECaddict

The roof on the E93 is not designed to support the car. Rollover bars behind the rear headrests will pop up in the event of a rollover to support the car.

This.

Also, I don't feel anything like that at all

07-21-2010, 11:17 AM	#1
TotalPower Lieutenant 32 Rep 480 Posts Drives: 2011 335is Vert AW Join Date: Dec 2009 Location: San Diego iTrader: (0)	Structural rigidity of e93 My question is about the strength of the roof on the e93. When you drive on bumpy roads with the window down and your hand on the joint between the roof and the a pillar, you can feel a wiggle which wouldn't be there in the case of a sedan or couple. How can this be improved, if at all? How much of the weight of the roof weight is in the arms and are they steel, iron, alum; how much of the weight is in the top panel, rear panel, back window? I figure that the A pillars of the e93 are stiffer than those of the coupe or sedan for a few reasons, but in the event of a roll-over with the top up, do the C pillars hold up well? I know the Rear seats have integrated roll bars which probably do not fire with the roof up(?). How does the joint between the front and rear panel hold up? Last edited by TotalPower; 07-21-2010 at 11:36 AM..
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07-21-2010, 11:28 AM	#2
deletedelete Major General 363 Rep 5,873 Posts Drives: m Join Date: Nov 2008 Location: usa iTrader: (14) Garage List 2013 e92 M3 [0.00] 2011 e93 M3 (sold) [0.00] 2009 335xi (sold) [0.00]	I have no idea but I can only imagine their must be some safety standard in the event of the roll. But then I think of the ford explorer or whatever that had a paper like roof that collapsed on a few people. __________________ ---> Click For xi/xDrive Suspension Compatibility List <---
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07-21-2010, 11:41 AM	#3
vasillalov Mad Linux Guru On The Loose 1121 Rep 5,396 Posts Drives: 2008 335i Sedan, 2023 M3 Join Date: Aug 2009 Location: Chicago, IL iTrader: (5) Garage List 2023 BMW M3 [0.00] 2008 335i E90 [8.00]	This is common with most "wagons". Try rear strut braces at the c-pilar. Look for something like this: __________________ 6MT \| COBB \| AR \| AE \| Forge DV \| HPF \| P3 Gauge \| Hybrid Intake \| O.S.Giken TCD \| All M3 bits \| TCKLine \| StopTech \| UUC \| ER \| SPEC
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07-21-2010, 03:38 PM	#4
VTECaddict Where'd my VTEC go? 481 Rep 6,067 Posts Drives: 06 330i 6MT Join Date: Mar 2009 Location: Seattle, WA iTrader: (4)	The roof on the E93 is not designed to support the car. Rollover bars behind the rear headrests will pop up in the event of a rollover to support the car. __________________ AW/Terra \| ZSP \| ZPP \| ZCW \| iDrive \| CA Mods: BC BR coilovers \| Blacklines \| M-tech rear \| dual exhaust \| M3 steering wheel \| BMW SSK \| ZHP shift knob \| High-kick CF spoiler \| NBT Retrofit M3 front control arms \| M3 rear guide rods \| Manzo rear toe and camber links \| Monroe rear shock mounts \| Varrstoen ES1 19x9.5+20 Front, 19x11+25 rear
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07-21-2010, 04:23 PM	#5
vasillalov Mad Linux Guru On The Loose 1121 Rep 5,396 Posts Drives: 2008 335i Sedan, 2023 M3 Join Date: Aug 2009 Location: Chicago, IL iTrader: (5) Garage List 2023 BMW M3 [0.00] 2008 335i E90 [8.00]	^^^ I apologize! I thought you guys were talking about wagons, but apparently, you are talking about convertables. __________________ 6MT \| COBB \| AR \| AE \| Forge DV \| HPF \| P3 Gauge \| Hybrid Intake \| O.S.Giken TCD \| All M3 bits \| TCKLine \| StopTech \| UUC \| ER \| SPEC
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07-21-2010, 05:18 PM	#7
g2artist Second Lieutenant 27 Rep 247 Posts Drives: E93 Join Date: Sep 2008 Location: Ventura, Ca iTrader: (0)	Yes
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