Carbon bonnets and ADR??
10-19-2007, 01:29 AM
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Carbon bonnets and ADR??
I just recently ordered a veilside carbom fibre bonnet from Japan and have just found out that they are illegal here or at least very hard to engineer!Does anyone know the exat rules, or who can "engineer" it for me, or if veilside hoods have been tested and proven to comply with ADR?? I just see so many on the raod but I am told that they are nearly all illegal and the cops love to pull you up for them..
10-19-2007, 01:40 AM
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yea I knew they were illegal also, due to reasons if there is an accident. Sorry don't know of whether it can be engineered, it would have to depend on the quality of the CF. There are a few guys around here who have CF bits and pieces but don't think any of them have gone to extents of having it engineered to my knowledge..don't think any of those guys really care.. get defected they will just switch back to stock bonnet and clear it..
10-19-2007, 01:47 AM
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Yes, the issue at hand (I believe) is that the bonnets dont stack up in a crash and you end up with pedestrians in the engine bay, etc etc.
Getting one ADR'd (ADR = Australian Design Rules) will be seriously unfeasible so dont bother.
As Missy said most guys dont care, they get defected, change back to stock hood, get RWC and change back. Really depends what you can be bothered with and if you can live with yourself after an accident if it comes into play.
Cheers
Andrew
Getting one ADR'd (ADR = Australian Design Rules) will be seriously unfeasible so dont bother.
As Missy said most guys dont care, they get defected, change back to stock hood, get RWC and change back. Really depends what you can be bothered with and if you can live with yourself after an accident if it comes into play.
Cheers
Andrew
10-19-2007, 04:44 AM
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Matt, its not that its not high grade CF, its that its designed to be cosmetic, not structural. In order for it to be structural you would need a lot more of it, it would need to be of even higher grade and you would be paying a LOT more for it.
10-19-2007, 05:47 AM
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The thing about carbon fibre is that they tend to split on impact rather than crumple as our aluminium ones do. As we all know, when the car gets hit, its built to crumple and absorb the energy in the crash and leave us with a trip to the GP rather than the ICU.
In a collision which involves the front end, the hood and fenders absorb quite a lot of the impact. If you swap it out with an aftermarket carbon fibre one it may look cool and you might save a kilo or 2, but you may end up worse if you were ever to be in an acco.
In short its defective for safety reasons because it could save your life or the life of another. You dont want to play with lives do you?
In a collision which involves the front end, the hood and fenders absorb quite a lot of the impact. If you swap it out with an aftermarket carbon fibre one it may look cool and you might save a kilo or 2, but you may end up worse if you were ever to be in an acco.
In short its defective for safety reasons because it could save your life or the life of another. You dont want to play with lives do you?
10-19-2007, 07:49 AM
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Bonnets
The underside of the bonnet is also designed with upside down eggcup shapes to lessen the impact on a pedestrians head in survivable impacts by not being too hard.
I recently picked up a spare bonnet and was amazed at the light weight and can't see how a carbon fibre one would be worth the effort other than for looks.
I recently picked up a spare bonnet and was amazed at the light weight and can't see how a carbon fibre one would be worth the effort other than for looks.
10-19-2007, 09:01 PM
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10-19-2007, 10:23 PM
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10-19-2007, 10:36 PM
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10-19-2007, 10:59 PM
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10-20-2007, 12:52 AM
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Well it's actually the vents that I am interested in.The car goes to the track regularly and if you have ever felt how hot it gets in the engine bay during a kaning you will see that some venting (i think) can only help..I also like the rice look.I can admit that.
10-20-2007, 04:10 AM
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Matt, you of course have the option of only having it on for track days. Its only a 30 min job to swap over a bonnet. Me personally, I have considered buying a second hood for track and cutting vents...Ghetto Style lol
10-20-2007, 09:11 AM
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10-21-2007, 06:50 PM
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IMHO, C/F bonnets are a bad idea for street work. Besides being illegal, you get no weight advantage and you make the car less safe for accidents (for you and whatever pedestrian you may hit).
As for overheating at track days, yes it gets hot uner the hood but these cars do not suffer from the kind of overheating issues that the FD and previous 7's did. Unless you are planning some seriously long sessions (by which time you'd start having tyre and brake issues anyways), I doubt you'll get much advantage from fitting a vented bonnet. If anything, the vents would just disturb airflow.
As for overheating at track days, yes it gets hot uner the hood but these cars do not suffer from the kind of overheating issues that the FD and previous 7's did. Unless you are planning some seriously long sessions (by which time you'd start having tyre and brake issues anyways), I doubt you'll get much advantage from fitting a vented bonnet. If anything, the vents would just disturb airflow.
10-21-2007, 08:03 PM
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I recall this being discussed quite some time back. For those of you who have the RX-8 story book, you will have read that Mazda went to some trouble to redesign the hood to improve pedestrian safety. Mazda substituted the normal underbonnet reinforcing with a second dimpled layer so that trauma would be reduced in case of pedestrian impact. I know it's impossible trying to reason with the "it's all about me" generation, but knowingly making your car less safe is just plain irresponsible.
10-21-2007, 09:46 PM
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I recall this being discussed quite some time back. For those of you who have the RX-8 story book, you will have read that Mazda went to some trouble to redesign the hood to improve pedestrian safety. Mazda substituted the normal underbonnet reinforcing with a second dimpled layer so that trauma would be reduced in case of pedestrian impact. I know it's impossible trying to reason with the "it's all about me" generation, but knowingly making your car less safe is just plain irresponsible.
Anyway each to their own, hes already ordered the bonnet - congrats I suppose
10-22-2007, 01:38 AM
#24
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I have searched back my threads.
I have posted something about vented hood.
Although the picture of result has gone (it should be in my old computer if you want me to find it).
Basically it WILL decrease the temperature of the compartments under the bonnet, but it WILL NOT change the oil temp or the coolant temp.
That was with an RX-8 using the RE Amemiya CF bonnett, tested in street level.
So I don't know how much benefit of it being on the track. There are so much you can do with that cash... buy a fresh set of brake pads for example.
https://www.rx8club.com/showthread.p...ht=vented+hood
stop heating arguements but Labrat is refering to this
https://www.rx8club.com/showthread.p...ht=vented+hood
I have posted something about vented hood.
Although the picture of result has gone (it should be in my old computer if you want me to find it).
Basically it WILL decrease the temperature of the compartments under the bonnet, but it WILL NOT change the oil temp or the coolant temp.
That was with an RX-8 using the RE Amemiya CF bonnett, tested in street level.
So I don't know how much benefit of it being on the track. There are so much you can do with that cash... buy a fresh set of brake pads for example.
https://www.rx8club.com/showthread.p...ht=vented+hood
stop heating arguements but Labrat is refering to this
https://www.rx8club.com/showthread.p...ht=vented+hood
Last edited by takahashi; 10-22-2007 at 01:41 AM.
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