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 Re: Bumper sturdness opinion required
[Re: paulevans76]
#677704
12/18/05 12:05 AM
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Joined: Sep 2002
Posts: 1,873
OP
Body Damage is Cool
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your best bet is to save the zu for the trail and buy a honda (from me) to drive to work and the grocery store <img src="/forums/images/graemlins/smile.gif" alt="" /> man, I have a feeling that you live in an ideal world, not the one I live in... Probably, you have a house (mansion ?) in the woods, and you can comfortably drive out your Isuzu from your garage directly to the trail. May be, you cut trees for living, or you hunt deers/bears/hippos/elephants for living. When you need to go to the store then you use your Honda Civic. I am jealous. My world is much less perfect: - I live far from any trail. To get to a trail, I have to drive many many many long miles on freeways. - I have more than 1 member in the family, and I need more than one general-purpose vehicle in the family. Well, I can justify a +1 dedicated expedition-oriented vehicle in the family, for recreation, but I cannot justify having also a dedicated trail-only rig, taking into account the long distance from any available trail. - I go to the trails not alone. If I go to a trail, usually I take my wife or a friend. I have to care about their comfort/safety during the drive. So, to sum the above statements, my Isuzu can be a recreational expedition vehicle, but in no way I can transform it into a trail-only rig. This is unrealistic. Modifing my Rodeo, I have to preserve it's drivability and safety, mostly. When I read about SASes, welded diffs and others tricks on this board, I feel like I read some fairy stories about others planets. I wish I could live on such a planet. One can try to drive from Northern California to Arizona/Utah/etc on a SAS, with a welded diff, with tube doors, having a family in the cabin, to understand my statement...
Oleg
Axiom 4WD 2004: OME shocks, 32" BFG Mudders, RockSliderz, OME929+2" spacers, Stinkyfab bent RE rear links, front ARB locker, rear No-Slip locker, DOR front axle lowering kit, custom middle section skid plate, IronMan torsion bars.
Deceased Rodeo'02 4WD.
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Re: Bumper sturdness opinion required
[Re: TrooperJ]
#677705
12/18/05 05:36 PM
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Joined: Apr 2003
Posts: 898
Rock Warrior
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You also must understand that unless you are getting hit with a solid steel bumper just like yours, (which in 99% of the cases you WONT be) the car hitting you will absorb a lot/most of the energy with IT'S bumpers that are designed to crumple. Now, if we are talking about hitting rocks with it, then thats a different story altogether... -J <img src="/forums/images/graemlins/kewl.gif" alt="" /> Not actually. Remember, the equal and opposite reaction thing? The same amount of energy will be displaced through both vehicles. However, the vehicle that hit you with crumple zones will absorb some of the energy and expend it through the crumpling of the metal. The energy that is transmitted to your vehicle will be the same as the other vehicle and will not be expended to crumple zones.
1995 Trooper LS auto 3.2 DOHC /w SOHC intake
1989 Trooper 2.6 auto
1989 I-Mark RS DOHC 1.6
1991 Stylus XS DOHC 1.8
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Re: Bumper sturdness opinion required
[Re: holger]
#677706
12/18/05 05:43 PM
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Joined: Mar 2001
Posts: 358
Mudrunner
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Remember too that a crumple zone is only a good thing for a certain distance. Once the vehicle starts crumpling into the cabin that can get very bad, very quick.
Bottom line if you can always pick your accidents then you always can pick the right bumper for the job. If not, then you will be making some compromises.
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Re: Bumper sturdness opinion required
[Re: litnin]
#677707
12/18/05 05:44 PM
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Joined: Aug 2000
Posts: 4,868
Roll Me Over
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Another issue to consider is whether or not you intend to use the bumper as an anchor point for either being extracted or extracting someone else.
If you are, then the design of the bumper needs to be such that it transfers the load to the frame without distorting the bumper.
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Re: Bumper sturdness opinion required
[Re: central]
#677708
12/18/05 06:38 PM
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Joined: Apr 2000
Posts: 7,268
Isuzu Moderator
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Remember too that a crumple zone is only a good thing for a certain distance. Once the vehicle starts crumpling into the cabin that can get very bad, very quick.
That is why in designing vehicles with true crumple zones (not just all the stuff aft of the windshield), the passenger compartment is basiclly a cage. It is designed to deform very little, while the rest of the car does deform.
Michael
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Re: Bumper sturdness opinion required
[Re: holger]
#677709
12/19/05 02:49 AM
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Joined: Jul 2001
Posts: 1,810
Body Damage is Cool
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your best bet is to save the zu for the trail and buy a honda (from me) to drive to work and the grocery store <img src="/forums/images/graemlins/smile.gif" alt="" /> man, I have a feeling that you live in an ideal world, not the one I live in... Probably, you have a house (mansion ?) in the woods, and you can comfortably drive out your Isuzu from your garage directly to the trail. May be, you cut trees for living, or you hunt deers/bears/hippos/elephants for living. When you need to go to the store then you use your Honda Civic. I am jealous. My world is much less perfect: - I live far from any trail. To get to a trail, I have to drive many many many long miles on freeways. - I have more than 1 member in the family, and I need more than one general-purpose vehicle in the family. Well, I can justify a +1 dedicated expedition-oriented vehicle in the family, for recreation, but I cannot justify having also a dedicated trail-only rig, taking into account the long distance from any available trail. - I go to the trails not alone. If I go to a trail, usually I take my wife or a friend. I have to care about their comfort/safety during the drive. So, to sum the above statements, my Isuzu can be a recreational expedition vehicle, but in no way I can transform it into a trail-only rig. This is unrealistic. Modifing my Rodeo, I have to preserve it's drivability and safety, mostly. When I read about SASes, welded diffs and others tricks on this board, I feel like I read some fairy stories about others planets. I wish I could live on such a planet. One can try to drive from Northern California to Arizona/Utah/etc on a SAS, with a welded diff, with tube doors, having a family in the cabin, to understand my statement... LOL <img src="/forums/images/graemlins/lol.gif" alt="" /> mansion--that's funny right there! No, I live in the same world as you. what I was trying to say was that, in most cases, the more you modify your truck for off-road, you sacrifice some on-road benefits. I don't know what you want to hear, I mean you could use your stock bumper until you get to the trails and switch them out to the others <img src="/forums/images/graemlins/confused.gif" alt="" /> I drive my old leaky squeeky trooper eveyday to work. My other trooper is being built for the trail and I probably won't drive it much aside from getting to it and back. (and no, there aren't any difficult trails for a good distance from me). I'm trading my current trooper for a friend's dented up 97 toyota camry that I will drive most days. And I drove my truck without front doors all summer, sometimes very long distances. it was not as fun as I thought it would be, especially in rain <img src="/forums/images/graemlins/shiner.gif" alt="" /> I am still waiting to hear back from the people on the hippo hunting job, but I will let you all know if it happens for me. until then I will have to suffer through selling honda civics <img src="/forums/images/graemlins/smile.gif" alt="" />
88 Troop - Posing yard art
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Re: Bumper sturdness opinion required
[Re: mlclark]
#677710
12/20/05 05:39 PM
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Joined: Mar 2001
Posts: 358
Mudrunner
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Remember too that a crumple zone is only a good thing for a certain distance. Once the vehicle starts crumpling into the cabin that can get very bad, very quick.
That is why in designing vehicles with true crumple zones (not just all the stuff aft of the windshield), the passenger compartment is basiclly a cage. It is designed to deform very little, while the rest of the car does deform.
Michael Agreed. However, at some point the momentum involved is so large that the cage will deform and/or allow intrusion into the cabin. In the case of a rear collision that could mean the gas tank ruptures. Could be a nice flat hunk of metal back there tied to the frame so that the frame has to bend to the tank could be a better option inspite of the greater whiplash impact. Again my point is that a solid bumper has advantages and disadvantages.
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