Discussion
Looks to me like the internal 'webbing' of the box section is there to add rigidity to stop the box itself folding in on or twisting under torsional loads.
With that being the case then I'd say there is no need to try and weld the internal sections with a weld all the way around the external box section sufficing in the same way it would a hollow box section.
With that being the case then I'd say there is no need to try and weld the internal sections with a weld all the way around the external box section sufficing in the same way it would a hollow box section.
audi321 said:
I know they’re road legal these cup tyres, but how on earth are they!
When you saw the tyre (I’ve never seen these before) on the video there’s hardly any tread whatsoever and makes a mockery of my mot failure because of a small area on the edge being at 1.5mm where the rest was well over 3mm.
Most of the cars they are designed and type approved for will run a fair bit of camber. So at road speeds, most of the tread on the ground is, in fact, the channelled inner section. You load the car up and then it’s sits more onto the outer, ‘cut slick’ edge.When you saw the tyre (I’ve never seen these before) on the video there’s hardly any tread whatsoever and makes a mockery of my mot failure because of a small area on the edge being at 1.5mm where the rest was well over 3mm.
They actually work well IME.
Jonnny said:
Those saying the internal box sections are not welded, genuine question - how would Lamborghini have welded them to the rest of the frame?
The pointis that they cut through an extrusion which had internal sections, and didn't reweld those internals. Presumably there's a point at which the subframe is bolted to the tub.Doofus said:
Jonnny said:
Those saying the internal box sections are not welded, genuine question - how would Lamborghini have welded them to the rest of the frame?
The pointis that they cut through an extrusion which had internal sections, and didn't reweld those internals. Presumably there's a point at which the subframe is bolted to the tub.Jonnny said:
Doofus said:
Jonnny said:
Those saying the internal box sections are not welded, genuine question - how would Lamborghini have welded them to the rest of the frame?
The pointis that they cut through an extrusion which had internal sections, and didn't reweld those internals. Presumably there's a point at which the subframe is bolted to the tub.Jonnny said:
Would those internal bits just be there for strengthening the inside of the box, to stop any twisting/folding?
Yes but if you cut the internals and don’t reattach them, you lose the strength it had originally.On a separate point, it wasn’t mentioned in the video and there must be a reason, but I wonder why they couldn’t take the whole of both sub frames off the donor car and do a total replacement on Mat’s. The two frames are clearly attached to the tub in some manner by welding, gluing, bolting or a combination.
Pedaller said:
On a separate point, it wasn’t mentioned in the video and there must be a reason, but I wonder why they couldn’t take the whole of both sub frames off the donor car and do a total replacement on Mat’s. The two frames are clearly attached to the tub in some manner by welding, gluing, bolting or a combination.
Because they aren't subframes. It's all one structure.thegreenhell said:
Pedaller said:
On a separate point, it wasn’t mentioned in the video and there must be a reason, but I wonder why they couldn’t take the whole of both sub frames off the donor car and do a total replacement on Mat’s. The two frames are clearly attached to the tub in some manner by welding, gluing, bolting or a combination.
Because they aren't subframes. It's all one structure.Pedaller said:
thegreenhell said:
Pedaller said:
On a separate point, it wasn’t mentioned in the video and there must be a reason, but I wonder why they couldn’t take the whole of both sub frames off the donor car and do a total replacement on Mat’s. The two frames are clearly attached to the tub in some manner by welding, gluing, bolting or a combination.
Because they aren't subframes. It's all one structure.Pedaller said:
Yes but if you cut the internals and don’t reattach them, you lose the strength it had originally.
You have to ask yourself why that internal structure is there though and whether trying to weld them back together is necessary. Are you actually losing something it had or chasing something it never did? I'm not a mechanical engineer and certainly no metal work specialist but with the knowledge I have through civil engineering it seem to me that those internal sections exist to provide torsional rigidity to prevent the box collapsing under load. That internal structure still exists in both sections that have been welded back together and so both sections still have the strength to resist such loads as they originally did.
The weld to the external box connecting the two separate pieces then provides the necessary lateral rigidity to create an acceptable repair.
Surely there's someone on this forum with the knowledge to properly put this one to bed? I'd actually like to know whether my interpretation of things is right....
audi321 said:
I know they’re road legal these cup tyres, but how on earth are they!
When you saw the tyre (I’ve never seen these before) on the video there’s hardly any tread whatsoever and makes a mockery of my mot failure because of a small area on the edge being at 1.5mm where the rest was well over 3mm.
Not to go too OT, however, on a car in the UK, its only the centre 3/4 of the tyre tread that is measured, as long as you don’t have cords showing, the edges can be 0mm, so if you are in the UK, and it was a car, it shouldn’t have been failed. When you saw the tyre (I’ve never seen these before) on the video there’s hardly any tread whatsoever and makes a mockery of my mot failure because of a small area on the edge being at 1.5mm where the rest was well over 3mm.
https://www.gov.uk/guidance/mot-inspection-manual-...
bobbo89 said:
Pedaller said:
Yes but if you cut the internals and don’t reattach them, you lose the strength it had originally.
You have to ask yourself why that internal structure is there though and whether trying to weld them back together is necessary. Are you actually losing something it had or chasing something it never did? I'm not a mechanical engineer and certainly no metal work specialist but with the knowledge I have through civil engineering it seem to me that those internal sections exist to provide torsional rigidity to prevent the box collapsing under load. That internal structure still exists in both sections that have been welded back together and so both sections still have the strength to resist such loads as they originally did.
The weld to the external box connecting the two separate pieces then provides the necessary lateral rigidity to create an acceptable repair.
Surely there's someone on this forum with the knowledge to properly put this one to bed? I'd actually like to know whether my interpretation of things is right....
It’s possible that was done, but not shown in the video edit, maybe, for brevity?
Digga said:
Mech engineer here. IMHO, the internal webs need to be continuous. If you don’t join them, it’s a bit like the perforations on a postage stamp (remember them?).
It’s possible that was done, but not shown in the video edit, maybe, for brevity?
How would you do it though? Would you strip back the external box to weld them then weld back in the external box section? Could you sleeve it somehow? It’s possible that was done, but not shown in the video edit, maybe, for brevity?
I think there's too many unknown unknowns here.
Even the known unknows tell us that.
We have to remember that this is an entertainment program and as Mat is doing this to actually use it and presumably crash it again, with the professional help he's got in, I doubt anyone is going to want to have an unsafe structure associated with them.
Even the known unknows tell us that.
We have to remember that this is an entertainment program and as Mat is doing this to actually use it and presumably crash it again, with the professional help he's got in, I doubt anyone is going to want to have an unsafe structure associated with them.
John87 said:
Looks like the BMW could have been doing with a slight increase in ride height 
At what point do you decide that front splitter is more trouble than it's worth. 
And are the remaps worthwhile if they play havoc with the cars 'normal' settings and it s
ts itself every time there's a factory update? 
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