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Unread 08-17-2012   #1 (permalink)
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Default Aluminum vs. Carbon Fiber Driveshafts

What is the difference in the two besides the material? Will they both last just as long? Will they both handle the same hp and tq numbers? Can i power launch a Carbon Fiber DS? Will the Carbon fiber be that much of a difference?
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Unread 08-17-2012   #2 (permalink)
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Well I found this link to have some good info you should read about carbon fiber vs aluminum.

Difference Between Aluminum and Carbon Fiber | Difference Between | Aluminum vs Carbon Fiber

With my own experiences I have a carbon fiber hood on my 05 mustang GT and I love it. I keep my car inside a garage and only take it out on nice days so i don't have to worry about the hood getting 2 hot in the summer or cold in the winter. Overall carbon fiber to me is just something used to stand out and does not make a real noticeable difference in performance vs a aluminum substitute.
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Unread 08-17-2012   #3 (permalink)
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Originally Posted by cape6 View Post
Well I found this link to have some good info you should read about carbon fiber vs aluminum.

Difference Between Aluminum and Carbon Fiber | Difference Between | Aluminum vs Carbon Fiber

With my own experiences I have a carbon fiber hood on my 05 mustang GT and I love it. I keep my car inside a garage and only take it out on nice days so i don't have to worry about the hood getting 2 hot in the summer or cold in the winter. Overall carbon fiber to me is just something used to stand out and does not make a real noticeable difference in performance vs a aluminum substitute.
ummm...I think this discussion is about driveshafts.

OP: I had started working on a long drawn out response but this is just easier.

Precision Shaft Technologies, Critical Link™ Driveshafts
 
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Unread 08-18-2012   #4 (permalink)
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Is it worth the 1 to 2 lbs lighter and what is the difference truly in cab noise vs a aluminum? It is $400 more...

Does it allow the engine to turn easier because it has less weight to turn all the way back? Or in other terms can i get more net power to the ground vs an aluminum because it is less resistance all the way around and in an essence creating a larger centripetal force which turns it faster and faster vs the rate at which an aluminum would rotate faster and faster. I think i stated that right. Might have my terms mixed up, been awhile since i took physics.
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Unread 08-18-2012   #5 (permalink)
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1-2 lbs makes a big difference when spinning at 5,000 rpms. It also has an impact on the driveshafts critical speed. Determining "worth" is always subjective. What is "worth" it to one person might not be to another. My car has a harmonics issue at high speeds in the drive line. A carbon fiber driveshaft would be "worth" it to me. Less rotational mass, stronger, better dampening, safer....so what's "worth" it to you?
 
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Unread 08-18-2012   #6 (permalink)
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It is probably worth the investment. What is the life span of carbon fiber vs aluminum? It is exposed to all elements and mostly rain and extreme heat and humidity with me living in FL.
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Unread 08-18-2012   #7 (permalink)
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Good question on the long term durability.

From the research I've done and Ford has done for us...I think the extra $ may be worth it. I wouldn't want to second guess myself thinking "maybe I should have gotten the CF DS?".

CF is what they are running on the GT 500 IIRC...and it's a one piece. There is no aluminum 2 piece or 1 piece...so there may be some engineering and refinement (NVH) reason Ford chose that route. Just something to think about.

An aluminum one piece...might do the job for most but I do like the refined feel of my V6 Mustang and a Turbo kit may be in it's future so if I get the best...it's all I can do to keep the cars refinement. With the shock absorbing effect of the CF shaft, it might be easier on the whole drivetrain if you're gonna beat on it.
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Unread 08-18-2012   #8 (permalink)
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My opinion; a good laxative would net you about the same performance advantage as a carbon fiber drive shaft over an aluminum. 2lbs represents about .05% (1/20th of one percent) of the total mass of your car.

But it's rotational mass so you have to accelerate it twice! OK then double the effect to 4lb. That comes out to .10% (1/10th of one percent)

This would be the same difference as adding/subtracting .42 horsepower.

Carbon fiber has the advantage of a longer fatigue life over aluminum. It's less resistant to impacts than aluminum but stronger in tensile, sheer and compression than aluminum per unit mass. It also dampens vibrations better than aluminum.
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Unread 08-18-2012   #9 (permalink)
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And another real benefit to mitigating drive line induced noise and vibrations with a one piece shaft is the elimination of the center support bearing. That bearing is attached right to the uni-body sheet metal in the drive shaft tunnel. A very direct path for NVH to be transmitted into the cabin.

A good example of how the different materials transmit harmonics (vibration) would be to rap a steel drive shaft with a hammer. You get a pretty good ring. With an aluminum shaft, much less of a ring. With carbon fiber, none.
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Unread 08-19-2012   #10 (permalink)
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My one piece aluminum transmits much more NVH than the OEM two piece filled with heavy rubber. There is almost no dampending material inside the aluminum.
 
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Unread 08-19-2012   #11 (permalink)
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Well looks like the investment in the CF DS is in order. Thanks for the input. I guess it isnt so much performance gains at that point vs the sheer DD feel i assume. I am paying for luxury at this point.
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Unread 08-20-2012   #12 (permalink)
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Quote:
Originally Posted by Rockaholic View Post
Well looks like the investment in the CF DS is in order. Thanks for the input. I guess it isnt so much performance gains at that point vs the sheer DD feel i assume. I am paying for luxury at this point.

CFM uses an aluminum DSS ds and much faster cars as well use aluminum. Put that money towards the turbo kit, or suspension mods.

Can't go wrong with this kit!

http://www.allfordmustangs.com/forum...645-post1.html
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Unread 08-20-2012   #13 (permalink)
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Paycheck comes in this week so depending on bills this month I should be talking to you shortly about a purchase
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Unread 08-20-2012   #14 (permalink)
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I just beat the crap out of my one piece aluminum shaft at the UPR / Tasca Performance Event at New England Dragway. What an improvement. Mine is The "Driveshaft Shops" that utilizes the rear CV joint. Very professional people and high quality shafts from them.
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