General Questions

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Famine
You reduce the amount of cabin space for your un-helmeted head to fly around uncontrolled in the event of a crash.
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I see your point but your head hitting a bar would still be a far better option then a 3,000 pound car trying to enter your 'personal space'.
 
UnoMOTO
I see your point but your head hitting a bar would still be a far better option then a 3,000 pound car trying to enter your 'personal space'.
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Not really an issue. Rollcages only help in rollover accidents (hence the name...). You're just as boned in a side impact as you would be without the cage.


A rollcage is a metal protrusion into the cabin. You should only really travel in a rollcaged car if you're wearing a helmet.
 
Famine
Not really an issue. Rollcages only help in rollover accidents (hence the name...). You're just as boned in a side impact as you would be without the cage.


A rollcage is a metal protrusion into the cabin. You should only really travel in a rollcaged car if you're wearing a helmet.
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Maybe we are thinking of a slightly different set up.

This cage would provide you with more protection then not in a side impact. Yes, No?

90855259on4.jpg
 
Yes, but your head would bang rather nastily against that top bar. Normally, that's where some cars have airbags, or softer materials than a solid steel bar.
 
UnoMOTO
Maybe we are thinking of a slightly different set up.

This cage would provide you with more protection then not in a side impact. Yes, No?

90855259on4.jpg
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More protection than carbon fibre and GRP? Certainly. More protection than a car made of metal with side-impact bars and side airbags? Marginally, if at all.

But the increased risk of severe head injury isn't really worth it. Rollcage + helmet = win. Rollcage - helmet = fail.
 
Famine
Not really an issue. Rollcages only help in rollover accidents (hence the name...). You're just as boned in a side impact as you would be without the cage.
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Ah, UnoMoto's right. Rollcage like the one UnoMoto has illustrated (and that I was thinking of previously) not only protect you in a roll, they help the bodyshell redistribute energy for impacts in all directions. If you ever see a NASCAR unclothed, the chassis and rollcage are one (rather overweight and unnecessarily over wrought) package. Rallycar cages are not only welded in, but are specially gussetted (lovely) and welded into reinforced and seam-welded shells. This substantial rework means the cars are much much stronger than the road version of the same car.

Famine
A rollcage is a metal protrusion into the cabin. You should only really travel in a rollcaged car if you're wearing a helmet.
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But this is fair advice, especially if you're in cramped cabin with close cant rail (Elise, Ferraris etc.)
 
Venari
Ah, UnoMoto's right. Rollcage like the one UnoMoto has illustrated (and that I was thinking of previously) not only protect you in a roll, they help the bodyshell redistribute energy for impacts in all directions. If you ever see a NASCAR unclothed, the chassis and rollcage are one (rather overweight and unnecessarily over wrought) package. Rallycar cages are not only welded in, but are specially gussetted (lovely) and welded into reinforced and seam-welded shells. This substantial rework means the cars are much much stronger than the road version of the same car.
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Quite so - but the car in question has the same side-impact rigidity as a charcoal briquette. You could make it stronger by painting it, or with sellotape*.


*Transatlantic note: Scotch Tape.
 
Wouldn't that be a LOLcage?
 
He's a Buccaneers fan?

What is the ideal angle for a foot to strike a football when kicking for range? (Field Goal attempts)
 
Famine
Quite so - but the car in question has the same side-impact rigidity as a charcoal briquette. You could make it stronger by painting it, or with sellotape*.


*Transatlantic note: Scotch Tape.
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What in the world are you talking about (sellotape) I thought everyone knew that on this side of the ocean we all use duct tape (also called 200mph tape).
 
Speak for yourself. I use Duck Tape.

ducktape.JPG


:D
 
opelgt1969
What in the world are you talking about (sellotape) I thought everyone knew that on this side of the ocean we all use duct tape (also called 200mph tape).
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Duct tape (or Gaffer Tape) would be too strong in comparison to sellotape. I needed a flimsy material in order to stress the relative strength of carbon fibre/GRP in side impacts.
 
UnoMOTO
I see your point but your head hitting a bar would still be a far better option then a 3,000 pound car trying to enter your 'personal space'.
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No, it wouldn't, necessarily. Which would you rather lose 2 inches out of: your ankles, or your skull?

First, modern cars are designed to do everything they can to absorb the impact without violating the cabin, in order to defray as much impact energy as possible before it is transmitted to your body.

Now what happens if you tie the front and rear suspension pickup points together through a rigid rollcage? Right. The car does not crumple nearly as much where it was designed to do so. More impact energy is translated to your body. That's why you need a harness with twice as many straps as a standard seatbelt (and where each strap is twice as wide as a standard belt, too). That's why you need a racing seat that is contoured to you, and a helmet restraint/HANS, and a window net, and an interior side-impact net - to allow your poor body to absorb impact over as much area as possible.

Did you now that Snell motorcycle-rated helmets are not good enough for road racing with a cage? You need an SA-rated helmet, which is a tougher standard. That's because of the higher impact forces involved if your head hits that big steel pipe you've wrapped around yourself. And don't forget, that pipe is probably 4" closer to you in every dimension that the inside of your car.
 
Duke
Did you now that Snell motorcycle-rated helmets are not good enough for road racing with a cage? You need an SA-rated helmet, which is a tougher standard.
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I'm not sure the impact standards are different, but there are fire standards an SA helmet must meet which do not apply to an M helmet. Like I said, I'm not sure, and I'm not ready to find Snell's site and read the test standards. :sly: That's too much like work, or something.
 
Some moron at school got pissed at me
because i could recognize that he had a Saleen s7R on his binder. When i pointed it out to him he said "It's not a Saleen S7R. It's a Ferrari." When i pointed out how wrong he was, he took my notebook, which had a Koenignogseggseggseggggabbaseggviking on it. He asked me what it was, When I responded "Koenigsegg CCX," He went nuts and proceded to grab my pen and stab me with it, Yelling "ITS A LAMBO!" at the top of his lungs. When I got him off of me, which wasn't hard, considering he weighed 95 LBs, I pinned him down. I started lecturing about how Lambos have a different greenhouse compared to Ferraris. He eventually went to the Principal's office, and was suspended for the next week. I got off scot free, becaise i claimed it was in self defense. Should I feel bad?
 
I think you missed your bus stop and accidentally stumbled into the mental institution.

But he was right anyway, cause Koenigseggs are rebadged Lambos, which in turn are rebadged Ferraris. So yes you should feel bad.
 
Stig22121
Some moron at school got pissed at me
because i could recognize that he had a Saleen s7R on his binder. When i pointed it out to him he said "It's not a Saleen S7R. It's a Ferrari." When i pointed out how wrong he was, he took my notebook, which had a Koenignogseggseggseggggabbaseggviking on it. He asked me what it was, When I responded "Koenigsegg CCX," He went nuts and proceded to grab my pen and stab me with it, Yelling "ITS A LAMBO!" at the top of his lungs. When I got him off of me, which wasn't hard, considering he weighed 95 LBs, I pinned him down. I started lecturing about how Lambos have a different greenhouse compared to Ferraris. He eventually went to the Principal's office, and was suspended for the next week. I got off scot free, becaise i claimed it was in self defense. Should I feel bad?
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He stabbed you and all you did was hold him down? You should feel bad for not beating the living snot out of that kid....
 
Here's a car related question I've been pondering.

How does a simple exhaust modification (like a new exhaust system), change the sound of a car? I've pondering due to that my friend's old 3 Series sounds much deeper with a new exhaust on it even though that's all he's done for performance (everything else has been a repair).
 
*McLaren*
Here's a car related question I've been pondering.

How does a simple exhaust modification (like a new exhaust system), change the sound of a car? I've pondering due to that my friend's old 3 Series sounds much deeper with a new exhaust on it even though that's all he's done for performance (everything else has been a repair).
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I gives the car new acoustics. The sound travels along a whole new path, bouncing off the metal in different ways causing it to resonate differently.

I think...don't hold me to it.
 
That's basically it.

Think of the exhaust as a brass band powered by exhaust coming out of the engine. Change the length, diameter or shape of the exhaust and you change the sound that comes out at the end. Changing mufflers and resonators can either make it louder or quieter... and the shape and size of these things can change the tone of your exhaust... (that's why they're called resonators... they resonate at certain frequencies to cancel noise... unfortunately, since aftermarket exhausts aren't often tested in a sound lab, an aftermarket system doesn't cancel out resonance as effectively as a stock system... most of the time).

There's a black art in designing a "performance" exhaust... actually... you know an exhaust is good if the car sounds good. (i.e.: loud but melodious) and you know that an exhaust isn't as good as it can be if it sounds like crap. (i.e.: loud and fart-can-like)
 
I'd have to say the new exhaust on my dad's Ram 1500 Hemi sounds pretty nice. It is a dealer installed system, which splits the exhaust at the new muffler, aft of the cat. One of the biggest things I noticed about the new system is a lack of a 2nd muffler. The stock system uses two mufflers, a main one for when the engine acts as a normal V8 and a 2nd one, near the tail pipe for when the MDS activates and shuts off 4 cylinders. Before you really couldn't tell when MDS activated, but now the exhaust tone changes slightly when it kicks in. Overall though it improved the sound greatly, since I always felt it sounded way too quiet stock. I even got a short vid of the exhaust, though I need to make a better one...
 
Old Subaru, STi, new one STI (since 06)

GTi? No idea. I've seen badges done as GTi, gti and GTI... but I think VW just goes by GTI.
 
GTI and STI, officially.

Although there are lots of GTIs about... aren't there?

I count VW and Peugeot to begin, both GTI.

And I suppose there are lots of STIs about too, and I view owning any one of them with about the same amount of joyous rapture....
 
*McLaren*
Here's a car related question I've been pondering.

How does a simple exhaust modification (like a new exhaust system), change the sound of a car? I've pondering due to that my friend's old 3 Series sounds much deeper with a new exhaust on it even though that's all he's done for performance (everything else has been a repair).
Click to expand...
It's to do with the width of tubing and resonance, but also how many baffles there are in the back box. Fewer baffles means a louder exhaust.
 
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