Bumpers and airbags... - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > JK Jeep Wrangler Forum > JK General Discussion Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 12-01-2011, 06:22 AM   #1
Race Car Dave

WF Supporting Member
 
NFRs2000NYC's Avatar
 
Join Date: Nov 2011
Location: NYC
Posts: 6,927
Bumpers and airbags...

To all you guys with big steel bumpers, AEV, Warn, stingers, bullbars, whatever....how do these bumpers effect air bag sensors/deployment? Are there any ill effects? I know usually the "sensors" are basically trip wires, so when the stock plastic bumper collapses, the object hit "crushes" the sensor, and it trips the airbag. Steel bumpers however, especially the really strong ones, might not give at all, not allowing the sensor to even get touched, thus, not deploying the airbags, which is a concern. Any input guys?

NFRs2000NYC is offline   Quote Quick Reply
Old 12-01-2011, 06:34 AM   #2
The Bad Guy

WF Supporting Member
 
daggo66's Avatar
 
Join Date: May 2009
Location: NJ exile living in Baltimore
Posts: 22,067
That is not how it works. There are no sensors to be concerned about when changing bumpers. The airbags do not deploy based on contact, but rather the sudden deceleration. The strength of the material of the bumper has no bearing either.

__________________
Tom

"I've got two things in this world, my balls and my word and I don't break them for no one."
daggo66 is offline   Quote Quick Reply
Old 12-01-2011, 06:41 AM   #3
Jeeper

WF Supporting Member
 
bo9roadking's Avatar
 
Join Date: Jul 2011
Location: San Antonio
Posts: 650
The sensor is under the hood and not connected to the bumper at all. You can do whatever you want with the front bumper and it won't cause an issue with airbags. In fact, the only wires that run to the bumper are the ones for foglights if you have those.
__________________
2012 Unlimited Rubicon
Deep Cherry Red Crystal Pearl
bo9roadking is offline   Quote Quick Reply
Old 12-01-2011, 06:42 AM   #4
Race Car Dave

WF Supporting Member
 
NFRs2000NYC's Avatar
 
Join Date: Nov 2011
Location: NYC
Posts: 6,927
Thanks a lot gents. Thats what I wanted to hear.
NFRs2000NYC is offline   Quote Quick Reply
Old 12-01-2011, 12:13 PM   #5
Jeeper

WF Supporting Member
 
Comac90's Avatar
 
Join Date: Jul 2011
Location: Beer Town USA, 4yrs running
Posts: 607
Quote:
Originally Posted by bo9roadking View Post
You can do whatever you want with the front bumper and it won't cause an issue with airbags.
Not entirely true ...

...going to a steel bumper without crush cans does create a situation where the airbags could go off at speeds less than 6mph ... Think AEV MILSPEC vs AEV's regular front bumper.

I posed nearly that exact same question to AEV before I bought my MILSPEC.

T
__________________
2012 JKU Rubicon - Delivered 8/19/2011
Auto - 4.10s - AEV: 3.5" SC lift, Milspec front bumper, rear bumper, tire carrier w/ hi-lift mount, front skid plate, high-steer - Warn XD9000i w/ Viking Winchline - 35" BFG MTs - Hellas - Katzkin Leather - RAM iPad mount - Cobra 75/Firestik - Poison Spyder Fairlead - Mopar Enhanced Rock Rails - aFe y-pipe - Rock Hard Oil Pan/Engine Skid - 10lb PowerTank
Comac90 is offline   Quote Quick Reply
Old 12-01-2011, 12:56 PM   #6
Ex Navy man
 
rics1997's Avatar
 
Join Date: Oct 2010
Location: Bristol, Tn
Posts: 4,767
Well, I would say the crush can can play some effect but doubt it is that big. AEV is in the business of selling their bumpers and may stretch the truth a little to say theirs is the best. Not really a independent answer.

The reason I say this is I was in a little accident a few weeks back and have a steel bumper. I hit my brakes hard at 40mph and hit a full size deer square with my steel XHD bumper. Not only did it protect my Jeep from any damage, there was no airbag deployment. Really wouldn't expect it but then too it was a hard hit. The only thing that happened was the deer was destroyed, never seen one tore up so bad from a vehicle accident. Of course a true test will be hitting something solid as to instantly stop your Jeep, but I would say there wouldn't be a big enough difference to worry about and a good sturdy bumper will fair good in these test.
__________________
2010 Dark Charcoal Pearl Jeep Wrangler Sport S Automatic
4.88 Yukon w/Trac-Lok rear and Eaton ELocker Front - Synergy Gussets - B&M 70264 Trans Cooler
BDS 3" lift - BDS Fox 2.0 Racing Shocks
XHD front Bumper - Trektop NX - Goodyear MT/R w/Kevlar 35X12.5X15 on MB Chaos 5 Wheels - Thrush Turbo Muffler

Become a WranglerForum Supporting Member!
rics1997 is offline   Quote Quick Reply
Old 12-01-2011, 05:58 PM   #7
Jeeper

WF Supporting Member
 
Comac90's Avatar
 
Join Date: Jul 2011
Location: Beer Town USA, 4yrs running
Posts: 607
Quote:
Originally Posted by rics1997 View Post
Well, I would say the crush can can play some effect but doubt it is that big. AEV is in the business of selling their bumpers and may stretch the truth a little to say theirs is the best. Not really a independent answer.
Seriously, not trying to sound like I'm trying to bust balls , but is that conjecture or do you have some facts to back that up? It sounds like you're guessing, at best. How could going from an airbag system designed with crush cans in mind to then removing those crush cans hardly affect the system? - that doesn't make sense to me, but I'm no engineer.

What facts do we know? Well, we know that Mopar doesn't want airbags going off at less than 6mph on their factory-built vehicles (I have no idea if that's a federal law or not). We also know that AEV's Milspec bumper failed Chrysler's test, but that their crush can-equipped bumper passed, was the first winch bumper that ever passed Chrysler's airbag testing, and it is now on the production MW3 Rubicon. Granted, we know this from AEV ... but, they're a company that produced crush-can equipped and non-crush can equipped bumpers up until August. So, what difference does it make to them and what motive would they have to lie? (And, they've never been anything but straight up in my dealings with them.) If the crush cans didn't make that big of a difference, why didn't they just put the Milspec on the production MW3? It's certainly cheaper to produce.

The explanation given to me by Dave at AEV made logical sense ... if there is a direct impact on the end of the frame rail, the deceleration is faster (harder, whatever the right technical term would be) than if there was a crush can. I was told it's probably not a big deal unless there is an impact directly on end of the frame rail.

And, so, I went with no crush cans ...

T

__________________
2012 JKU Rubicon - Delivered 8/19/2011
Auto - 4.10s - AEV: 3.5" SC lift, Milspec front bumper, rear bumper, tire carrier w/ hi-lift mount, front skid plate, high-steer - Warn XD9000i w/ Viking Winchline - 35" BFG MTs - Hellas - Katzkin Leather - RAM iPad mount - Cobra 75/Firestik - Poison Spyder Fairlead - Mopar Enhanced Rock Rails - aFe y-pipe - Rock Hard Oil Pan/Engine Skid - 10lb PowerTank
Comac90 is offline   Quote Quick Reply
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Jeep JK Safety Concerns DTJEEP JK General Discussion Forum 97 05-11-2012 02:32 PM
Front bumpers and AirBags Jeepin Dave JK General Discussion Forum 13 10-30-2011 11:54 AM
air bag bumpers MVines JK General Discussion Forum 3 11-27-2010 07:22 PM


logo carid shop wrangler parts carid fender flares custom wheels store avs deflectors at carid
» Rates
Get low rates on auto insurance in Canada!

» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 02:39 AM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC