940T vs. Tahoe

940Tman · 09-27-2007, 10:14 AM

My poor volvo

after an hour of putting things back into position with a crowbar and stepping on the hood :

So yep..... life sucks right now.

Three Fat Tigers · 09-27-2007, 10:20 AM

If the air bag didn't go off, that is not bad at all. With access to the parts, it wouldn't take more than a few hours to fix that.

Did the bag go off?

500dollar744ti · 09-27-2007, 10:21 AM

at least it wasn't a Renault Modus

940Tman · 09-27-2007, 10:23 AM

No airbags didn't go off, I know its pretty simple I mean all I need is a new hood and headlight and to fix up the mount for the radiator. How fast do you need to be going to set off the airbag?

940Tman · 09-27-2007, 10:25 AM

Quote:

Originally Posted by 500dollar744ti

at least it wasn't a Renault Modus

hahaha, I love that car so much, it's been running since 1984 only major problem thus far has been the fuel pump....

Glowyrm · 09-27-2007, 10:25 AM

15mph I think.

940Tman · 09-27-2007, 10:27 AM

Quote:

Originally Posted by Glowyrm

15mph I think.

That's probably about how fast I was going at the point of impact...

Three Fat Tigers · 09-27-2007, 10:34 AM

500$ plus a trip to macco should cover that. The inner structures can most likely be repaired DIY, but otherwise it wouldn't take a pro very long to do that part.

940Tman · 09-27-2007, 10:36 AM

500$ for what?

240on280 · 09-27-2007, 12:33 PM

Quote:

Originally Posted by Glowyrm

15mph I think.

Isn't it a function of deceleration, not a function of speed at impact? If I understand it right an accelerometer triggers the air bag deployment.

Glowyrm · 09-27-2007, 01:11 PM

I don't recall if Volvo used a spring type delcel, but I beileve they are calibrated for a 15 MPH single car impact with immovable object. So I 2 car impact will go off at a higher speed.

orie · 09-27-2007, 01:34 PM

Quote:

Originally Posted by 240on280

Isn't it a function of deceleration, not a function of speed at impact? If I understand it right an accelerometer triggers the air bag deployment.

+1, but i think it also has to be at a minimum speed (15mph?)

Three Fat Tigers · 09-27-2007, 01:43 PM

Quote:

Originally Posted by 940Tman

500$ for what?

100 headlight assembly
100 fender
150 hood
150 or so for bumper trim and miscelaneous

red740ft · 09-27-2007, 02:06 PM

Quote:

Originally Posted by orie

+1, but i think it also has to be at a minimum speed (15mph?)

Speed at impact is not the criterion, except with an immovable barrier (approxiamtely since there is a rebound effect that causes the speed change to be greater than the impact speed). Also, the damage appears to be above the level of the bumper/frame, and therefore to a less rigid area of the car and the deceleration occured over a comparatively longer time interval. The sensing mechanism on that vintage of vehicle is probably a spring and ball or spring and magnet arrangement to close a ground to arm the bag. This is the way the threshold is set. The term used is 'speed change'. In a car/car collision there is usually some post-impact speed of each and the change, in a co-linear collision (head-on or rear-end) is simply the difference between the impact speed and the post-impact speed. It is more complex in oblique or right-angle collisions because the sensor is aligned with the long axis of the car. Hence in a purely side impact the sensor will never arm the bag - they are meant to deploy in collision up to about +/- 30 degrees from frontal. The newer incarnations of airbag technology are more sophisticated than the spring/ball.

240on280 · 09-27-2007, 02:17 PM

Quote:

Originally Posted by red740ft

Speed at impact is not the criterion, except with an immovable barrier (approxiamtely since there is a rebound effect that causes the speed change to be greater than the impact speed). Also, the damage appears to be above the level of the bumper/frame, and therefore to a less rigid area of the car and the deceleration occured over a comparatively longer time interval. The sensing mechanism on that vintage of vehicle is probably a spring and ball or spring and magnet arrangement to close a ground to arm the bag. This is the way the threshold is set. The term used is 'speed change'. In a car/car collision there is usually some post-impact speed of each and the change, in a co-linear collision (head-on or rear-end) is simply the difference between the impact speed and the post-impact speed. It is more complex in oblique or right-angle collisions because the sensor is aligned with the long axis of the car. Hence in a purely side impact the sensor will never arm the bag - they are meant to deploy in collision up to about +/- 30 degrees from frontal. The newer incarnations of airbag technology are more sophisticated than the spring/ball.

So it's deceleration force (g) on the spring? Force = mass x deceleration in this case.

orie · 09-27-2007, 02:22 PM

Ahhh, good to know. Perhaps less sophisticated, but appears to work well enough, if it didn't trigger in this case (probably when it shouldn't..).

So, what happened to the tahoe? Scraped the head-height 'bumper' a bit? gotta love how your bumper isn't even touched. I believe that there should be a standard height for bumpers, an that all vehicles must have one at that height.

And on a somewhat unrelated rant, what is up with modern so-called 'bumpers', that are foam padded $800 panels?

I tapped into someone leaving a parking lot a few months ago, and the lady gets out of her car, stares at her bumper, looks for scratches, and finally decides no damage was done. I literally TAPPED it, less than i've seen people do when parking. Come on, it's a freakin bumper. BUMPer.

mblue240 · 09-27-2007, 03:05 PM

Quote:

Originally Posted by 240on280

So it's deceleration force (g) on the spring? Force = mass x deceleration in this case.

Please don't use the word "deceleration." There is no such thing, it's just acceleration in the opposite direction(of the vector). I taught physics at a Univeristy for a couple of years and that took us almost a month to pound into Freshman heads.

orie · 09-27-2007, 03:10 PM

But what about braking... how is that acceleration in any direction?

mblue240 · 09-27-2007, 03:16 PM

Quote:

Originally Posted by orie

But what about braking... how is that acceleration in any direction?

It's been several years since I've done any write-ups on this stuff. But if I remember right we either showed it as acceleration in the opposite direction or as added friction. I believe in the case of a car it would be the later.

orie · 09-27-2007, 03:27 PM

*nod* that makes sense. Though, take a look at 2. below:

deceleration

noun
1. a decrease in rate of change; "the deceleration of the arms race" [ant: acceleration]
2. (physics) a rate of decrease in velocity [ant: acceleration]
3. the act of decelerating; decreasing the speed; "he initiated deceleration by braking" [ant: acceleration]

mblue240 · 09-27-2007, 03:44 PM

Quote:

Originally Posted by orie

2. (physics) a rate of decrease in velocity [ant: acceleration]

The professor that I taught with would have kicked you in the teeth for that

She almost kicked me when I showed her something along those lines. I finally decided it was in my best interest to agree with the doctor in front of me than some guy that wrote the dictionary.

orie · 09-27-2007, 03:56 PM

Damn dictionary people...

I remember being told similar things in my physics class as well, so i think you are on the money.

Glowyrm · 09-27-2007, 04:02 PM

Had the same beating in the Navy nuke school physics class

940Tman · 09-27-2007, 05:50 PM

Well nothing happened to the tahoe except a dent about the size of a quarter on his left side... and ya it was his bumper height that did all this sh**. Wish it would have been a civic in front of me. But anyways, I got charged for wreckless driving, that is 117$ ticket and 3 points on my license. The tahoe turned into my lane then slammed on his brakes cuz of the guy in front of him. w/e...

940Tman · 09-27-2007, 05:52 PM

Quote:

Originally Posted by Three Fat Tigers

100 headlight assembly
100 fender
150 hood
150 or so for bumper trim and miscelaneous

hmm, makes sense, except I'm going to the junkyard, lol.

09-27-2007, 10:14 AM	#1
940Tman Board Member Join Date: Sep 2007 Location: O-town, Florida	940T vs. Tahoe My poor volvo after an hour of putting things back into position with a crowbar and stepping on the hood : So yep..... life sucks right now. __________________ 97' 850 GLT

09-27-2007, 10:21 AM	#3
500dollar744ti still rides with MrDoug Join Date: Feb 2007 Location: Fairfax, VA	at least it wasn't a Renault Modus __________________ -Matt 1989 744T- 16v turbo, '94 FD-block, RSI pistons/rods, GT35R, Tial 38mm, RFL, MSnS-E, DSM spark, 100lb Delphis, 4.6 springs, Bondo header, Heebspeed intake, Q45 90mm TB, Bosch 044 FP, 12x24x3 ebayIC, w/c t5, Clutchnet 4puck/PP, 4.10 G80, IPD sways, 960 brakes. 1983 Ford F150- 302ci, C6/4x4, 7" lift, 35s. 1990 Cobia San Marino 225 ECS- MCM 350 Mag, GM Bowtie Intake, Bulletspeed lower, HR-Titan 20p. the rest: 1996 850t 179k, 1998 S90 175k, 2004 V70 2.4 175k, 2005 XC90 2.5t AWD 122k.

09-27-2007, 10:25 AM	#6
Glowyrm Board Member Join Date: Jul 2007 Location: Long Island	15mph I think. __________________ '89 764 Bone Stock (for now) '87 XJ loaded with all kinds of crap

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09-27-2007, 10:23 AM	#4
940Tman Board Member Join Date: Sep 2007 Location: O-town, Florida	No airbags didn't go off, I know its pretty simple I mean all I need is a new hood and headlight and to fix up the mount for the radiator. How fast do you need to be going to set off the airbag?

09-27-2007, 10:34 AM	#8
Three Fat Tigers Board Member Join Date: May 2003 Location: ↓ Lynchburg, VA →\| '84 242Ti \| '90 760Ti \| '92 240 \| '94 940T \| '96 960 \| '96 M1	500$ plus a trip to macco should cover that. The inner structures can most likely be repaired DIY, but otherwise it wouldn't take a pro very long to do that part.

09-27-2007, 10:36 AM	#9
940Tman Board Member Join Date: Sep 2007 Location: O-town, Florida	500$ for what?

09-27-2007, 01:11 PM	#11
Glowyrm Board Member Join Date: Jul 2007 Location: Long Island	I don't recall if Volvo used a spring type delcel, but I beileve they are calibrated for a 15 MPH single car impact with immovable object. So I 2 car impact will go off at a higher speed.

09-27-2007, 02:22 PM	#16
orie Doctor Who Join Date: Dec 2004 Location: Folsom, CA	Ahhh, good to know. Perhaps less sophisticated, but appears to work well enough, if it didn't trigger in this case (probably when it shouldn't..). So, what happened to the tahoe? Scraped the head-height 'bumper' a bit? gotta love how your bumper isn't even touched. I believe that there should be a standard height for bumpers, an that all vehicles must have one at that height. And on a somewhat unrelated rant, what is up with modern so-called 'bumpers', that are foam padded $800 panels? I tapped into someone leaving a parking lot a few months ago, and the lady gets out of her car, stares at her bumper, looks for scratches, and finally decides no damage was done. I literally TAPPED it, less than i've seen people do when parking. Come on, it's a freakin bumper. BUMPer.

09-27-2007, 03:10 PM	#18
orie Doctor Who Join Date: Dec 2004 Location: Folsom, CA	But what about braking... how is that acceleration in any direction?

09-27-2007, 03:27 PM	#20
orie Doctor Who Join Date: Dec 2004 Location: Folsom, CA	nod that makes sense. Though, take a look at 2. below: deceleration noun 1. a decrease in rate of change; "the deceleration of the arms race" [ant: acceleration] 2. (physics) a rate of decrease in velocity [ant: acceleration] 3. the act of decelerating; decreasing the speed; "he initiated deceleration by braking" [ant: acceleration]

09-27-2007, 03:56 PM	#22
orie Doctor Who Join Date: Dec 2004 Location: Folsom, CA	Damn dictionary people... I remember being told similar things in my physics class as well, so i think you are on the money.

09-27-2007, 04:02 PM	#23
Glowyrm Board Member Join Date: Jul 2007 Location: Long Island	Had the same beating in the Navy nuke school physics class

09-27-2007, 05:50 PM	#24
940Tman Board Member Join Date: Sep 2007 Location: O-town, Florida	Well nothing happened to the tahoe except a dent about the size of a quarter on his left side... and ya it was his bumper height that did all this sh**. Wish it would have been a civic in front of me. But anyways, I got charged for wreckless driving, that is 117$ ticket and 3 points on my license. The tahoe turned into my lane then slammed on his brakes cuz of the guy in front of him. w/e...