GT SPEC Mid chassis ladder brace Feeler - GB

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GTSPEC said:
ok, we got the FX on the lift, look like the mid chassis required modification to fit on the FX.

We will have the brace mock up next week (help from Logan from RPMNYC).

Two of the mounting points required a chassis rivet (like those on the front engine brace), and the other two are stock bolt / mounting points.

The two mounting points that required chassis rivet also required drilling, need to enlarge the holes by about 1 to 2 mm.

We have to extend the brace about 2" to 3" since the FX body are wider compare to the G and Z.

But yes, the project is going forward and prototype brace will be done in 1 to 2 weeks.



Mark.
GTSPEC
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Thank you Mark(GTspec)!!

Sweet can't wait to see the final product!!!

Now... My next question is... How much will the brace be going for? Are we going to get a discount due to the fact that we are buying a bunch of them as a GB? Let us know.

Have a good day!
 
I still want to hear an answer to Alan's question about how this affects crumple zones.
 
Hi Mark,

I have had a question in my mind for a long time. I heard from somewhere saying that a car can not be too rigid. Too many bracings will cause over stiffness of the car body frame and eventually that some other part of the vehicle will become loose due to the force and energy during driving and corner needed to be released and will eventually need stitch weld on the body frame where there is no bracing reinforcement.

Don't get me wrong on questioning the mid chassis bracing. I love GT Spec and I have all all the possible bracing on my FX already. :.smile:
 
StuLax18 said:
I still want to hear an answer to Alan's question about how this affects crumple zones.
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White_Hair said:
Hi Mark,

I have had a question in my mind for a long time. I heard from somewhere saying that a car can not be too rigid. Too many bracings will cause over stiffness of the car body frame and eventually that some other part of the vehicle will become loose due to the force and energy during driving and corner needed to be released and will eventually need stitch weld on the body frame where there is no bracing reinforcement.

Don't get me wrong on questioning the mid chassis bracing. I love GT Spec and I have all all the possible bracing on my FX already. :.smile:
Click to expand...

I'm a civil engineer (undergrad) but we've studied the same types of physics of a mechanical engineer on this aspect. As far as I know:

1) On a side impact, the stiffness from a mid-chassis brace will be good as it'll distribute the force to the other side rail better than regular underbody chassis. Basically, on a side impact, your FX won't bend as much inwards as it would without a brace like this

2) On a frontal impact, the majority of the force are absorbed by the crumple zones on the front, as well as the engine. If you have the full frontal braces, it will reduce the chassis crumpling but then chasis is designed NOT to crumple. There are other pieces for that job

3) On a rear impact, it'll jolt you a bit better than w/o a mid chassis brace but then again, you have crumple zones in the back..

Basically, as far as crumple zones & safety in an accident goes, you will be safer with more braces. Think about race cars. They're basically a full-on welded brace structure and hardly cause any damage to the driver in an accident.

As for the other pieces loosening, I think I'll have to agree BUT your FX will have loose pieces even with the addition of some springs. These pieces will be cabin pieces mainly, not body structures as the body structures are either welded or bolted tight to the chassis. Adding more bracing to the chassis will help prevent any twisting torque applied to the chasis, and naturally, the pieces attached to it. Your FX will be a bit more stiff, a bit less comfortable but way more rigid. That means, the impacts will be more absorbed by the springs & suspension then by the chassis twisting & turning...

And all these are "as far as I know".. Might be wrong.. :smile:
 
EG3 said:
I'm a civil engineer (undergrad) but we've studied the same types of physics of a mechanical engineer on this aspect. As far as I know:

1) On a side impact, the stiffness from a mid-chassis brace will be good as it'll distribute the force to the other side rail better than regular underbody chassis. Basically, on a side impact, your FX won't bend as much inwards as it would without a brace like this

2) On a frontal impact, the majority of the force are absorbed by the crumple zones on the front, as well as the engine. If you have the full frontal braces, it will reduce the chassis crumpling but then chasis is designed NOT to crumple. There are other pieces for that job

3) On a rear impact, it'll jolt you a bit better than w/o a mid chassis brace but then again, you have crumple zones in the back..

Basically, as far as crumple zones & safety in an accident goes, you will be safer with more braces. Think about race cars. They're basically a full-on welded brace structure and hardly cause any damage to the driver in an accident.

As for the other pieces loosening, I think I'll have to agree BUT your FX will have loose pieces even with the addition of some springs. These pieces will be cabin pieces mainly, not body structures as the body structures are either welded or bolted tight to the chassis. Adding more bracing to the chassis will help prevent any twisting torque applied to the chasis, and naturally, the pieces attached to it. Your FX will be a bit more stiff, a bit less comfortable but way more rigid. That means, the impacts will be more absorbed by the springs & suspension then by the chassis twisting & turning...

And all these are "as far as I know".. Might be wrong.. :smile:
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Thanks EG. That is the technical analysis that I have been looking for. :tup:
 
Rubare said:
Oops I just couldn't avoid putting that D there! Sorry man!
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I should've posted this one:
wwe_edge_530x260.jpg

:laugh:
 
That's very true. Especially since drivers of vehicles with roll cages usually have 4-5 point harnesses, helmets, and much more motion restrictive seating.
 
Well alan yes it's not a cage.. But we are trying to integrate supports on different point of the frame to make it stronger. Not a roll cage but we are trying to immitate that.
 
Roll cages are for when you flip, suspension bracing is to help the vehicle in the handling department. No one here should be trying to get a roll cage in their FX...
 
I think the most important questions here to me are: Is the mid chassis bracing going to help the more even force transfer during cornering? Is it suitable for daily driving?

I am asking this question because I am living in a city with "LOTS" bumpy roads and pot holes pretty much everywhere. I am just afraid that over stiffness can cause the other part of the body frames to be loose or suffer more force due to less forces were transfer into body flex. A lot of bracings are designed for race cars or high performance street cars, but those cars, most people don't drive them for daily use (except for Rookie :tongue:). So I was just wondering the feasibility of this bracing.

Don't get me wrong. I am not against anyone's comment or this bracing. I love to have this one on my FX. I love the FX with GT-Spec bracing.:smile:
 
fxlr8 said:
Roll cages also stiffen the chasis.
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I see your point jeff. I need to do more researches on the difference between roll cage and bracing reinforcement. I believe roll cage protects the driver and passenger more during the case of rolling over or side impacts. :.smile:

And IMO, I see the bracing reinforce more on the frames. The roll cage reinforces the chassis more. But i am not an expert in this, I don't know if that makes a difference, since chassis are attached to the frame. :confused:
 
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fyi did you know other vendors are using our comments to sell gtspec
post 14
http://www.iwsti.com/forums/gr-susp...nforcement-brace-gtspec-picture-thread-2.html

we are not the only one asking these questions, other car owners express this concern also.

I am not trying to burst everyones bubbles, I may eventually get them if I feel the need, but I just want everyone to at least think about the consequences of doing any mod to there vehicle (good or bad).


all any vendor has to do to limit their liability is to label it "off road use only" .... anyways it would be nice if the manufacture can address this rather then a member here.
 
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Not in the sense of flipping the FX dude.. Yes braces are helping the suspencion but how ate they accomplishing that job?? By making the frame stiffer.. Which translate into stronger frame. Now is not a roll cage but I bet my ass that if you get two fxes one with all the braces(mid chassis include) and one without to go thru the same crash.. Tell me which one will be more damaged. So beside performance it provide safety.
 
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