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Author Topic: Carbon Fiber Question - Gas Coupe  (Read 5522 times)

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Offline Fhawk365

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Carbon Fiber Question - Gas Coupe
« on: December 20, 2010, 10:55:58 AM »
Are replacement OEM style carbon fiber hoods and fenders allowed in Gas Coupe?

Thanks,
Joshua
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Offline JR529

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Re: Carbon Fiber Question - Gas Coupe
« Reply #1 on: December 20, 2010, 11:25:20 AM »
Yes, as long as they are exact replicas. All turn signals, vents, bumps, bulges etc... must be virtually identical.
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Offline Jonny Hotnuts

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Re: Carbon Fiber Question - Gas Coupe
« Reply #2 on: December 20, 2010, 12:03:54 PM »
Curious, its it because you already have them and wonder if they are legal or do you trying to get more speed?

~JH
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Offline Stan Back

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Re: Carbon Fiber Question - Gas Coupe
« Reply #3 on: December 20, 2010, 02:15:39 PM »
Could be he wanted to get some weight off up high and off the front end.  Or didn't want to fight the rust.
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Offline Fhawk365

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Re: Carbon Fiber Question - Gas Coupe
« Reply #4 on: December 20, 2010, 07:53:53 PM »
The original hood on the car I'm building has some light hail damage and I can replace it with a carbon fiber hood for the same price as a stock OEM replacement. The additional weight savings is a plus.
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Offline Stainless1

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Re: Carbon Fiber Question - Gas Coupe
« Reply #5 on: December 20, 2010, 09:22:57 PM »
Are you sure you want to get rid of the speed dimples...  :roll:
 :cheers:
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Offline Jonny Hotnuts

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Re: Carbon Fiber Question - Gas Coupe
« Reply #6 on: December 20, 2010, 11:15:34 PM »
Quote
The additional weight savings is a plus

How is it a plus?
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"Sometimes it is impossible to deal with her, but most of the time she is very sweet, and if you caress her properly she will sing beautifully."
*Andres Segovia
(when Im not working on the car, I am ususally playing classical guitar)

Offline Speed Limit 1000

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Re: Carbon Fiber Question - Gas Coupe
« Reply #7 on: December 21, 2010, 12:23:14 AM »
 :? Newbie  :?   :cheers:
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Offline Peter Jack

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Re: Carbon Fiber Question - Gas Coupe
« Reply #8 on: December 21, 2010, 12:33:01 AM »
In lsr on the salt light weight means limited traction. Many cars are ballasted heavily to get up to speed.

Pete
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Offline Jonny Hotnuts

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Re: Carbon Fiber Question - Gas Coupe
« Reply #9 on: December 21, 2010, 01:05:42 AM »
Truth is there are some real benefits to CF, namely it doesnt rust, looks cool and can provide weight benefits if orchestrated properly.

Something like a CF hood can lower the center of gravity, this is good....but.....it also reduces forward weight, and this is bad. Basically you are looking to get weight forward and as low as possible. The low weight will help the car from rolling in a spin and forward weight keeps the car straight.

If one car can go 200 mph and weighs 1000 pounds if you add 2000 pounds more weight (3K total) you will only loose a few mph. The loss is from tire deformation and rolling resistance on the wheel bearings.

This is another story when you start talking about 300+mph vehicles where rolling resistance can start to become a real drag.

Basically dont worry about weight reduction, it will waste you money and may make your car unstable at high speeds. Do concern yourself with proper COG/COP relationships.

-and....

We were all nubes at one point....

~JH


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"Sometimes it is impossible to deal with her, but most of the time she is very sweet, and if you caress her properly she will sing beautifully."
*Andres Segovia
(when Im not working on the car, I am ususally playing classical guitar)

Offline Stan Back

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Re: Carbon Fiber Question - Gas Coupe
« Reply #10 on: December 21, 2010, 12:03:21 PM »
JH --

It's still a drag race to the quarter.  And most American coupes have more weight on the front than the back.  And accelerating that weight calls for traction.  Adding weight to the front ain't gonna get that done.  So keeping the weight balance right by adding ballast to the rear adds to the total weight -- and effects acceleration.

Stan
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Offline John Noonan

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Re: Carbon Fiber Question - Gas Coupe
« Reply #11 on: December 21, 2010, 01:01:42 PM »
Quote from: Jonny Hotnuts on December 21, 2010, 01:05:42 AM
Truth is there are some real benefits to CF, namely it doesnt rust, looks cool and can provide weight benefits if orchestrated properly.

Something like a CF hood can lower the center of gravity, this is good....but.....it also reduces forward weight, and this is bad. Basically you are looking to get weight forward and as low as possible. The low weight will help the car from rolling in a spin and forward weight keeps the car straight.

If one car can go 200 mph and weighs 1000 pounds if you add 2000 pounds more weight (3K total) you will only loose a few mph. The loss is from tire deformation and rolling resistance on the wheel bearings.

This is another story when you start talking about 300+mph vehicles where rolling resistance can start to become a real drag.

Basically dont worry about weight reduction, it will waste you money and may make your car unstable at high speeds. Do concern yourself with proper COG/COP relationships.

-and....

We were all nubes at one point....

~JH




JHN,

Using your example you are not taking in to consideration of the heavier vehicle being able to accelerate as quickly as the lighter vehicle or how quick it can come off the push truck, yes proper weight distribution is very important like you said however in this class most of the racers are adding weight in the back from what I have seen.  And it's "Noob"  :wink:
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Offline johnneilson

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Re: Carbon Fiber Question - Gas Coupe
« Reply #12 on: December 22, 2010, 12:48:02 AM »
I have a question, how much weight difference are you looking at?

In the CF world of parts, the dollar is inversly proportional to the weight.

I have seen many "inexpensive" CF parts that are slutted fiberglass.

One problem is how stiff the hood is and how much structure is behind it.

John
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Offline John Noonan

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Re: Carbon Fiber Question - Gas Coupe
« Reply #13 on: December 22, 2010, 02:30:54 AM »
John,

On a similar hood I saw about 8-10 pound difference minus the OEM mounting bracket/hinges.

J
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Offline dw230

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Re: Carbon Fiber Question - Gas Coupe
« Reply #14 on: December 23, 2010, 01:42:08 PM »
In Gas Coupe all the lights must be in the car. Just the recesses will not pass. The lights need not work and decals are not a substitute.

DW
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