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Topic Review (Newest First)
02-24-2012 08:50 PM
Howards YJ Once the paint spiderwebs it will chip easier but as such as debre hitting it not really. The clear coat will secure it enough that it will spiderweb and not chip right away. It will eventually flake off after the intiall spiderwebb but you are talking months in time frame. Honestly its not that expensive to either by a plastic prep solvent or flex aditive and does not really change the process of application, so there is no reason really not to use it. I know some old time painters will say not to worry about it but my thought is, cheap insurance is cheap insurance. I have never seen, even in collisions plastics that have used one of these two methods spiderweb. I have however seen them spiderweb pretty bad in really low speed collisions on plastic parts painted without either a plastic prep solvent or flex aditive.
02-24-2012 07:55 PM
SilverBolt
Quote:
Originally Posted by kbwwolf View Post
Unless I'm mistaken, inertial sensors (such as an accelerometer) activate the airbag based on the level of sudden deceleration.
Correct.

They also take in account the vehicle speed. An airbag will not deploy at 5mph.
02-24-2012 04:22 PM
WCrow
Quote:
Originally Posted by Howards YJ
As for the painting issue, you can paint plastic or just about any other flexible material. In order to do this and maintain a good paint job a flex agent is added to your primer so it will expand and contract(to a certain extent) with the substance being painted. You can see when body shops do not use this on the newer plastic bumpers cause when lightly impacted the paint spiderwebs.
However, I have painted three of my own vehicles plastic parts without this and have had very few problems. I used a plastic adhesive prep solvent prior to painting them though.
Ok. Thank you. Is there a big problem with the paint chipping easier or anything?
02-24-2012 04:05 PM
Howards YJ As for the painting issue, you can paint plastic or just about any other flexible material. In order to do this and maintain a good paint job a flex agent is added to your primer so it will expand and contract(to a certain extent) with the substance being painted. You can see when body shops do not use this on the newer plastic bumpers cause when lightly impacted the paint spiderwebs.
However, I have painted three of my own vehicles plastic parts without this and have had very few problems. I used a plastic adhesive prep solvent prior to painting them though.
02-24-2012 03:53 PM
LBrito The airbags are actually deployed under a much more complex system than you think. It is not just a sensor on the frame, or anywhere else. It's really a combination of accelerometers (to detect rapid deceleration, not just an impact that does severe damage but doesn't slow you down), combined with brake pressure sensors (same as those used for brake assist, can detect panic braking), the gyro is also taken into account, to determine if its frontal, side, a rollover, etc.

So, generally, if you hit a very solid object, yes, with an aftermarket, the solid bumper will cause rapid deceleration more than when the oem crushes, very very marginally slower, but really, they're both going to deploy generally.
But, with aftermarket, you may also have more mass to go through an object, like wooden pole, and not get rapid deceleration from it, whereas the OEM would bounce back and slow you down fast, causing a deploy.
But really, either one will deploy generally if deployment is needed. If the bumpers were not safe, they would have been black listed from use already, along with brush guards, and all after market things people use. I mean, seriously... we can't even use certain colored headlights on the street, bumpers would have been gone by now.
02-24-2012 03:43 PM
kbwwolf
Quote:
Originally Posted by johndarke View Post
I can't wait till my Rampage bumper gets here...
You could drive through a building with the Rampage. Probably wouldn't even have to take the rattle can off the shelf to touch it up.
02-24-2012 03:42 PM
kbwwolf
Quote:
Originally Posted by SilverBolt View Post
#1 the airbag sensors are inertia activated. What that means is that if an impact happens over a predetermined load the bags deploy.
Unless I'm mistaken, inertial sensors (such as an accelerometer) activate the airbag based on the level of sudden deceleration.
02-24-2012 03:37 PM
johndarke Yeah, after seeing exactly what the front bumper consists of (about 20 lbs. of sheet metal and plastic) I couldn't believe Chrysler put those on a vehicle which is supposed to be off-road capable. I drive to work every day through deer-filled country and I wanted something that would give my brand new 30 grand vehicle at least a little chance of surviving an impact intact.

I can't wait till my Rampage bumper gets here...
02-24-2012 03:15 PM
daggo66 Your rear bumper is about 10lbs of hollow plastic. The front bumper is a plastic covered metal rail. There are no "sensors" in the bumper or on the body. Wherever you got your information, it's flat out wrong.
02-24-2012 03:12 PM
kik
Quote:
Originally Posted by SilverBolt View Post
You are very wrong on the sensor/aftermarket bumper issue. #1 the airbag sensors are inertia activated. What that means is that if an impact happens over a predetermined load the bags deploy. Does not matter what is hanging off the front or rear. #2 regarding the crumple zone(s), the crumple zone(s) remain in place. The frame is the crumple zone not the bumper. Aftermarket bumpers use the same mounting points as the factory bumper. DOT requires that a factory bumper has to withstand a 5mph impact with minimal damage. That is why the stock bumpers are flexi-plastic crap.
Silver said it best. 5mph and under you want to do the crushing to the other vehicle and your bumpers/rig stay intact. That's why a good steel aftermarket bumper is the best for a variety of reasons.
02-24-2012 01:31 PM
SilverBolt You are very wrong on the sensor/aftermarket bumper issue. #1 the airbag sensors are inertia activated. What that means is that if an impact happens over a predetermined load the bags deploy. Does not matter what is hanging off the front or rear. #2 regarding the crumple zone(s), the crumple zone(s) remain in place. The frame is the crumple zone not the bumper. Aftermarket bumpers use the same mounting points as the factory bumper. DOT requires that a factory bumper has to withstand a 5mph impact with minimal damage. That is why the stock bumpers are flexi-plastic crap.
02-24-2012 01:23 PM
Badgoof73 I painted my flares but there is a process that you have to go through to make the paint stick. Most well known body shops can paint them.
02-24-2012 01:08 PM
kbwwolf
Quote:
Originally Posted by WCrow View Post
The bumpers are plastic. Does this matter?
I don't think so. I know there are people on the forum who've painted their plastic aftermarket fenders...Bushwackers and such. And the stock fenders on the paint-matched Saharas and Rubis are plastic.

Seems like just about anything can be painted. I'd just call up a couple of body shops and ask em. It would surprise me if they couldn't do it.
02-24-2012 12:44 PM
WCrow
Quote:
Originally Posted by kbwwolf
Get the # for the paint match from the dealer and find a good body shop. They'll be able to hook you up.
The bumpers are plastic. Does this matter?
02-24-2012 12:42 PM
WCrow I was referring to the sensors on the body. That's why the stock bumpers are flexible. Cars today are made to kill the car and save the person.
02-24-2012 12:42 PM
kbwwolf Get the paint match # for your Jeep from the dealer and find a good body shop. They'll be able to hook you up.

Your airbags will still deploy normally with an aftermarket bumper. The only things not utilized by most bumpers are the crush cans, whose only purpose is to absorb impact.

If you're concerned about your airbags working, read these:

Crush Cans...necessary?

Front bumpers and AirBags
02-24-2012 12:41 PM
WCrow Yes
02-24-2012 11:53 AM
kjeeper10
Quote:
Originally Posted by WCrow
I just ordered a 2012 Jeep unlimited Sahara (white). And I have been looking up bumpers. I realized aftermarket bumpers are not as safe bc they make the jeeps with stock bumpers flexible so if you hit something the sensors trigger and your airbags go off at the correct time. To the point... I have seen on google and YouTube how people paint the stock bumpers to match the color of their car. Can anyone give me information on this? Thanks.
No sensors in the bumpers if that's what you mean.
You just want a factory paint matched bumper(s)?
02-24-2012 11:31 AM
WCrow
Paint...

I just ordered a 2012 Jeep unlimited Sahara (white). And I have been looking up bumpers. I realized aftermarket bumpers are not as safe bc they make the jeeps with stock bumpers flexible so if you hit something the sensors trigger and your airbags go off at the correct time. To the point... I have seen on google and YouTube how people paint the stock bumpers to match the color of their car. Can anyone give me information on this? Thanks.

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