Seatbelts tighten when driven hard

BeeEm · 01-11-2011, 03:28 PM

On my E92 335i, I get the impression the seatbelts tension and tighten whenever I drive her hard. Does anyone else experience this? Is this a design feature?

5050punk · 01-11-2011, 03:32 PM

Appears to be by design:

http://autos.aol.com/cars-BMW-335-2007/safety-features/

Quote:

Pretensioners
Seatbelt pretensioners automatically tighten seatbelts to place the occupant in the optimal seating position during a collision.

JIM E92 · 01-11-2011, 04:19 PM

Quote:

Originally Posted by 5050punk

Appears to be by design:

http://autos.aol.com/cars-BMW-335-2007/safety-features/

I believe our seatbelt tesnsioners are pyrotechnic..therefore one time use only.

ww007 · 01-11-2011, 04:32 PM

I would expect this to be a feature on any modern car. My 2006 Acura TSX had the same feature. You wouldn't want yourself or your passengers to be thrown about the cabin during hard maneuvers would you? It's probably based on some inertia trigger.

B3AST · 01-11-2011, 04:36 PM

Is this thread serious?

Tee212 · 01-11-2011, 04:50 PM

Theres a check ball inside every seat belt mechanism which locks during pitch/dive/yaw/squats.

BKV122 · 01-11-2011, 07:15 PM

yea had this in my '93 mini van

Spoolin335 · 01-11-2011, 10:04 PM

Quote:

Originally Posted by Tee212

Theres a check ball inside every seat belt mechanism which locks during pitch/dive/yaw/squats.

He means the seatbelt actually pulls you in tighter even though you are not pushing against it.

I notice this in my E92 aswell. I figure is was designed to do that.

username604 · 01-11-2011, 11:49 PM

Quote:

Originally Posted by Spoolin335

the seatbelt actually pulls you in tighter even though you are not pushing against it.

bsamoul · 01-11-2011, 11:50 PM

All seatbelts do

username604 · 01-11-2011, 11:56 PM

Quote:

Originally Posted by bsamoul

All seatbelts do

ThreeseriesFTW · 01-12-2011, 08:42 AM

Quote:

Originally Posted by B3AST

Is this thread serious?

lol for real

Although it's not really the OP that concerns me, since it was a genuine question. It's the responses.

BeeEm · 01-12-2011, 08:54 AM

Based on the responses, this appears that it is not a something generally experienced. Perhaps this is only a feature on models destinated for outside US.

ChasVS · 01-12-2011, 09:12 AM

I suspect it's a matter of the driver movement since the seatbelt will automatically take up slack as you are pressed back into the seat, and then when you return to your initial position it's tighter than when you first fastened it.

reprod · 01-12-2011, 11:30 AM

Quote:

Originally Posted by BeeEm

Based on the responses, this appears that it is not a something generally experienced. Perhaps this is only a feature on models destinated for outside US.

This happens on my US model 335...

Floor the gas pedal and then try to move the seat belt within 2-3 seconds... You will be firmly denied...

Minefield · 01-12-2011, 12:23 PM

Quote:

Originally Posted by BeeEm

On my E92 335i, I get the impression the seatbelts tension and tighten whenever I drive her hard. Does anyone else experience this? Is this a design feature?

Quote:

Originally Posted by 5050punk

Appears to be by design:

http://autos.aol.com/cars-BMW-335-2007/safety-features/

Quote:

Originally Posted by ww007

I would expect this to be a feature on any modern car. My 2006 Acura TSX had the same feature. You wouldn't want yourself or your passengers to be thrown about the cabin during hard maneuvers would you? It's probably based on some inertia trigger.

Quote:

Originally Posted by Spoolin335

He means the seatbelt actually pulls you in tighter even though you are not pushing against it.

I notice this in my E92 aswell. I figure is was designed to do that.

Quote:

Originally Posted by ChasVS

I suspect it's a matter of the driver movement since the seatbelt will automatically take up slack as you are pressed back into the seat, and then when you return to your initial position it's tighter than when you first fastened it.

Quote:

Originally Posted by reprod

This happens on my US model 335...

Floor the gas pedal and then try to move the seat beltwithin 2-3 seconds... You will be firmly denied...

Quote:

Originally Posted by BeeEm

Based on the responses, this appears that it is not a something generally experienced. Perhaps this is only a feature on models destinated for outside US.

LOL, must be first time driving with seatbelts...

Quote:

Originally Posted by Tee212

Theres a check ball inside every seat belt mechanism which locks during pitch/dive/yaw/squats.

Quote:

Originally Posted by BKV122

yea had this in my '93 mini van

Quote:

Originally Posted by B3AST

Is this thread serious?

Quote:

Originally Posted by corb

lol for real

Although it's not really the OP that concerns me, since it was a genuine question. It's the responses.

B3AST · 01-12-2011, 01:36 PM

------------------->>>

335TWNTURBO · 01-12-2011, 03:19 PM

Quote:

Originally Posted by corb

lol for real

Although it's not really the OP that concerns me, since it was a genuine question. It's the responses.

+1

335TWNTURBO · 01-12-2011, 03:24 PM

BMW drivers can be dicks.......

especially on this forum.

dday · 01-12-2011, 04:07 PM

I def noticed this with my 335 and hadn't noticed it on previous cars. I just assumed it was taking up slack after being pushed into my seat. If I accelerate aggressively the seatbelt feels tighter once I stop accelerating

BRAISKI · 01-12-2011, 04:17 PM

Quote:

Originally Posted by ww007

I would expect this to be a feature on any modern car. My 2006 Acura TSX had the same feature. You wouldn't want yourself or your passengers to be thrown about the cabin during hard maneuvers would you? It's probably based on some inertia trigger.

Even my RSX had it too, when I even hit a bump or sometimes a pothole, the seatbelt locks up for an instant...

SliverBullet · 01-12-2011, 04:41 PM

Quote:

Originally Posted by 335TWNTURBO

BMW drivers can be dicks.......

especially on this forum.

Ummm yea right.. dicks. I think they were just trying to inject some common freakin sense. OH NO!! my seat belt is holding me in when I make sudden jerky acceleration/ movements with a modern BMW. UMMMM DUHHHHH!!!!

01-11-2011, 03:28 PM	#1
BeeEm Private 14 Rep 67 Posts Drives: 2014 F32 435iA Coupe M Sport Join Date: Oct 2005 Location: Johannesburg iTrader: (0) Garage List 2014 F32 435i Coupe ... [0.00]	Seatbelts tighten when driven hard On my E92 335i, I get the impression the seatbelts tension and tighten whenever I drive her hard. Does anyone else experience this? Is this a design feature? __________________ F32 435i Coupe M-Sport, Estoril Blue, 442M staggered, Harman Kardon, Navigation System Professional, M Sports Suspension, Sunroof, M Sport brakes, High Beam Assist, Rear Camera, PDC, Enhanced Bluetooth.
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01-11-2011, 04:32 PM	#4
ww007 Second Lieutenant 16 Rep 227 Posts Drives: 2011 e93 335i Join Date: Jan 2011 Location: Pasadena, CA iTrader: (0) Garage List 2011 BMW 335i e93 ' ... [0.00]	I would expect this to be a feature on any modern car. My 2006 Acura TSX had the same feature. You wouldn't want yourself or your passengers to be thrown about the cabin during hard maneuvers would you? It's probably based on some inertia trigger.
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01-11-2011, 04:36 PM	#5
B3AST Captain 21 Rep 634 Posts Drives: with a huge grin (E90) Join Date: Nov 2008 Location: Houston, TX iTrader: (1)	Is this thread serious? __________________ "All fixed set patterns are incapable of adaptability or pliability. The truth is outside of all fixed patterns." -Bruce Lee
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01-11-2011, 04:50 PM	#6
Tee212 Banned 81 Rep 4,541 Posts Drives: yes Join Date: Oct 2008 Location: Riverside iTrader: (9) Garage List 2010 335 [8.00]	Theres a check ball inside every seat belt mechanism which locks during pitch/dive/yaw/squats.
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01-11-2011, 07:15 PM	#7
BKV122 Major 47 Rep 1,160 Posts Drives: E90 Join Date: Feb 2009 Location: NY iTrader: (1) Garage List 2006 330xi [9.50]	yea had this in my '93 mini van __________________ Monaco Blue 330xi - Terra Interior/6-MT/Sport/Premium/Cold/CSL's/M3 Spoiler Lip/Black Kidney's
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01-11-2011, 11:50 PM	#10
bsamoul Major General 167 Rep 7,433 Posts Drives: E90 325i Join Date: Feb 2007 Location: Walnut Creek, California iTrader: (2)	All seatbelts do __________________ -Brian 2X 2006 BMW 325i [Electric Red & Mystic Blue] \| ZPP \| V1 \| Rear Fogs \| M3 Lip Spoiler \| EAS RemoteKey \| BMS Powerbox \| Projector90 Headlights w/ LED AE \| LED plate lights \| OEM Blacklines http://www.tech-shine.com
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01-12-2011, 08:54 AM	#13
BeeEm Private 14 Rep 67 Posts Drives: 2014 F32 435iA Coupe M Sport Join Date: Oct 2005 Location: Johannesburg iTrader: (0) Garage List 2014 F32 435i Coupe ... [0.00]	Based on the responses, this appears that it is not a something generally experienced. Perhaps this is only a feature on models destinated for outside US. __________________ F32 435i Coupe M-Sport, Estoril Blue, 442M staggered, Harman Kardon, Navigation System Professional, M Sports Suspension, Sunroof, M Sport brakes, High Beam Assist, Rear Camera, PDC, Enhanced Bluetooth.
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01-12-2011, 09:12 AM	#14
ChasVS Colonel 40 Rep 2,431 Posts Drives: 2012 MB ML350 Bluetec Join Date: Aug 2009 Location: Central FL iTrader: (10)	I suspect it's a matter of the driver movement since the seatbelt will automatically take up slack as you are pressed back into the seat, and then when you return to your initial position it's tighter than when you first fastened it.
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01-12-2011, 01:36 PM	#17
B3AST Captain 21 Rep 634 Posts Drives: with a huge grin (E90) Join Date: Nov 2008 Location: Houston, TX iTrader: (1)	------------------->>> __________________ "All fixed set patterns are incapable of adaptability or pliability. The truth is outside of all fixed patterns." -Bruce Lee
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01-12-2011, 03:24 PM	#19
335TWNTURBO Captain 54 Rep 740 Posts Drives: 07 335i Join Date: Jul 2009 Location: MARYLAND iTrader: (0)	BMW drivers can be dicks....... especially on this forum.
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01-12-2011, 04:07 PM	#20
dday Captain 33 Rep 856 Posts Drives: 2014 Alpine White 335 M-Sport Join Date: Jun 2010 Location: MA iTrader: (1)	I def noticed this with my 335 and hadn't noticed it on previous cars. I just assumed it was taking up slack after being pushed into my seat. If I accelerate aggressively the seatbelt feels tighter once I stop accelerating
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