Reply to Thread

Any updates?

Not yet.

I'm still out of town and will not return until Tuesday.

vc

Any updates?

---------------------------------



1998 Z3 1.9 - few modifications here and there
1999 Z3 2.8 - individual edition (British Traditional)
2003 Z4 2.5i

I got mine at BMW, no problems...

...and huskerbmw has GREAT discounts on BMW parts if you're a BMWCCA member. I'd take a look at them.

Heavy Machinery Lab, Carrier

Re: Where did you buy the guibo?

Wow,
I was about to replace my guibo/flex joint for maintenance at 94k, but now I am wondering if that was a good thing or bad thing??

Please do tell where it was purchased if defective..

my Dad worked at UT back in the 80s...

You ever work in the Dallas area?

One of the the client of the VC I worked in for...

...in Italy was the developer of an enclosed optical gyroscope-accelerometer used in avionics. I remember that one of the market opportunity we looked at was rollover detection systems for the automotive industry... It was very cool stuff and it was quite interesting to learn the theory behind it (well, not that I fully grasped it, but still very interesting)
---------------------------------



1998 Z3 1.9 - few modifications here and there
1999 Z3 2.8 - individual edition (British Traditional)
2003 Z4 2.5i

Instrumentation Technician

I studied automotive engineering at General Motors Institute. Before I got my EE degree, I was an instrumentation technician at United Technologies. At the Patent Office, I examined accelerometer applications.

Solid state accelerometers and gyros (three accelerometers basically) are very common these days in inertial navigation systems, shock sensing, etc. (I am sure that is what they use in those Lenovo thinkpads that sense being dropped and shut down the hard drive before impact).

Very few companies use large mechanical sensors anymore, when these semiconductor devices can be made, and integrated into a control circuit, for fractions of a penny. The days of the mechanical gyroscope are numbered.

This Bosch sensor from 1989 (see link) uses a pendulous accelerometer in a viscous fluid to detect rollover. I think it was used in the Mercedes SL with the early retractable rollbars.

But I think since those days, most manufacturers have switched to solid state devices.

While a driveshaft whacking the transmission hump might not seem like enough force to set off an airbag, in terms of instantaneous acceleration, it could be well over 100gs or so. Sudden shocks can have very high acceleration spikes like that.

FWIW.

Thanks Robert!!!

You're always very insightful when it comes to electronics. I like it cuz you always teach me something new!!! Thanks
---------------------------------



1998 Z3 1.9 - few modifications here and there
1999 Z3 2.8 - individual edition (British Traditional)
2003 Z4 2.5i

Re: Your guess would probably be correct.

Yes. Please let us know. I am going to replace mine soon.

accelerometers

I'm willing to bet the modern crash sensors use solid state accelerometers (accelerometer on a chip) which has a micro-machined pendulum made of silicon. Sometimes they use what is called a 'rebalance' accelerometer, where force is applied to the beam to keep it in place and the force measured to keep it there is a function of acceleration.

The days of bumper-mounted plunger sensors are long gone.

A sudden shock load like a kick in the hump by a flying driveshaft could generate 100g's of instantaneous acceleration, more than enough to set it off.

Sort of a freak occurrence, I'd think. Although this illustrates why disconnecting the battery is a good idea if you are working near an airbag.

Man, that's terrible!!

I'm wondering if the insurance company may try to total it...
If so, it would be a good one to buy back from them ;-)

Looking at that picture reminds you why

you don't use cut-rate windshield replacement outfits. That totaly sucks....

We the People of the United States, in Order to form a more perfect Union, establish Justice, insure domestic Tranquility, provide for the common defence, promote the general Welfare, and secure the Blessings of Liberty to ourselves and our Posterity, do ordain and establish this Constitution for the United States of America.
A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed.
Signature to be included in the footer of all your posts. (HTML is ok)
Note: to include a picture in your signature, use HTML that looks like

You may place a link to your own site in your signature if you have a
reciprocal link to us on that page and follow the guidelines in our Link FAQ.
Links in violation of the Link FAQ may be removed without warning. Please also
do not include any pornographic or non-work-safe images in your signature.

Those bastards!!!!

I was looking around for a guibo some time ago for the 2.8 and noticed that the suspect was quoting something like 50% BMW MSRP or some crazy discount like that... Since I've bought some exhaust hanger from them in the past that failed after some 1500 miles I decided not to buy it form them... And your experience is making me happy I didn't...

I'm wondering if they could be liable for something like what happened to you?

But PLEASE, post their name, if indeed is them: people gotta know!!!!
---------------------------------



1998 Z3 1.9 - few modifications here and there
1999 Z3 2.8 - individual edition (British Traditional)
2003 Z4 2.5i

Fill me in so I don't make that mistake ;-)

Your guess would probably be correct.

I'll need to double check my purchase records, but my memory supports your likely guess.

vc

Re: Unusual front airbag deployment.

Where did you buy the guibo?

I could take a guess, but...
---------------------------------



1998 Z3 1.9 - few modifications here and there
1999 Z3 2.8 - individual edition (British Traditional)
2003 Z4 2.5i

He's fine.

He has just one small cut on his arm from airbag debris. He was able to safely coast to the side of the road. I don't know how he was able to do that with an airbag in his face (he had to manually deflate it to see out the windshield, which was shattered). That passenger airbag destroyed the passenger side of the car. The dash is split in half, the glove box is hanging out, all of the A/C ducts are blown out, the rearview mirror was destroyed, the sunvisor is broken, and the windshield is shattered and bulged out about 2 inches.

The insurance company is going to look at it today. I don't know if they will cover it or not.

The guibo breakage and the airbag deployment were simultaneous. He just heard a boom, then couldn't see anything. The car was completely filled with white smoke and inflated airbags.

vc