General > Past L-E Projects
Initial D 4th Stage comments... - Archive Topic (Locked)
JC:
chichin0: Cage was rated for a certain amount of movement, top and front point bars snapped on impact... They're supposed to bend, not snap. So we're useing an alloy this time, not hi card stainless steel forged.
5 point harness? 4 points are quite adequate, and all we can afford to use...
What questions was there to answer, and where? I don't own a 300ZX that claims to do under 10s, I'm more interested in track events, say... 280 and 480 hp classes... The only times I even think of drag racing is after tweaking on my own car, and it's nothing impressive at the moment, still running stock times of 16s (Funny, my car is still stock!)
chichin0:
I understand what youre saying about the snapping of the roll cage, however at the speed the driver was going that is to be expected, im not trying to start a flame war or anything, its just that without the rollcage the cars frame and body would have had to absorb all of that impact that the cage took (and in the end broke under the pressure).
Roll cages as most of you already know are kind of mislabeled, a roll cage (if correctly implemented) stiffens the chassis to help protect the driver in an accident (and most of the time improves handling and lessens torsional body forces) , they are not end all be all fixes and will break (as in the case of the ~160 side impact). However, even in breaking they have absorbed a large amount of force (high carbon steel is tough shit) and still can be considered to do their job (probably saving drivers life).
As for using Aluminum alloy what alloy are you using? I have a metallurgy class right now and its just out of curiousity. The only thing about aluminum cages is that you have to use more of the metal to get the same strength as hi carbon steel... aluminum is only lighter when you dont have to use twice as much to get the same effect (connecting rods demonstrate this nicely, on average an aluminum con rod weighs more than a steel one). And as we all know after watching ID, weight is everything in racing. You dont want to engineer an inferior roll cage, that will slow acceleration, worsen handling and braking, and not protect the driver as well... any way those were my 2 cents... this is a wonderful thread btw, even if a little off topic ;)
Usagi_Yojimbo:
You have to keep in mind that NO roll cage is designed to protect the vehicle, only the driver. if you hit a wall or roll you're vehicle at high speeds, it's probab;y gonna be scrap, heavily damaged at the very least. Trust me I'm a Tow Truck Driver and I specialize in off road recovery, and the only cages I've seen stand up to a roll or a hard hit, are titanium exoskeletons, not really performance enhancing. Most rollcages will break in places if you wreck at more than 50 MPH. the point is they protect the occupant(s)
JC:
The one we'd installed was supposed to be rated to hold rigidity to up to 300km/h, but... Eh...
We need a new R32 body now :P
The alloy we're looking at is the same sort of alloy used to make the blocks in cars, especially the new Holden (Uhm... Pontiac... I think for you US people) Alloytec V6 and V8 engines (192Kw as an NA engine... Yummy), but that's up to the people who race, I just tune the suspension and a few other things.
Considering the impact and everything, we were able to recover most of the block, both diffs (GTR), gearbox, and 50% of the fuel system... Ironically, the bracket that had been put in for a NOS bottle was completely destroyed on impact, thus making us relieved that there wasn't a bottle in there, else it'd be a different kettle of fish :/
NOS is death in a bottle :P
CooBlueDAB:
--- Quote ---chichin0: Cage was rated for a certain amount of movement, top and front point bars snapped on impact... They're supposed to bend, not snap. So we're useing an alloy this time, not hi card stainless steel forged.
5 point harness? 4 points are quite adequate, and all we can afford to use...
What questions was there to answer, and where? I don't own a 300ZX that claims to do under 10s, I'm more interested in track events, say... 280 and 480 hp classes... The only times I even think of drag racing is after tweaking on my own car, and it's nothing impressive at the moment, still running stock times of 16s (Funny, my car is still stock!)
--- End quote ---
My appologies, the comments about cages made me believe that you were the ricer with teh 300z... lol...
Anyways... when using a bucket seat with a 4 point harnest or more... you should have... aka need a roll cage because if you roll over, instead of sliding sideways in the seat while the roof collapses... you would be trapped straight up, and have your neck snapped or head crushed by the roof.
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