I'm not following your logic- spending twice the amount of money for identical parts made out of identical materials doesn't make sense... however there are tangible benefits to spending the extra and getting the CF DS. Not the least of which are increased safety if there is ever a catastrophic failure and the resonance issue I've read about in several places.

The minor saving in weight between the two probably doesn't amount to anything worth double the cost but it's still an additional benefit.

Also given the fact the 350s / 370s (assuming) DS is CF makes me wonder why this design decision was made over AL... I'm not being sarcastic- I'd be interested in that input if anyone knows.

I'm humming and hawing over this as well- and for the longest time I thought I'd convince myself that AL was the right choice- predominantly because of cost... But time and time again I end up back at CF.

If this were a budget build I'm sure that I could probably get by on AL- but it's not a budget build... and it doesn't sound like his is either. As it is I'm gradually stuffing some extra money in my cheeks for when the time comes to make this happen.

 

^If you go with aluminum I would recommend a 4" shaft, it will fit.

I have yet to notice any negative affects of the aluminum shaft. I've only had mine for just under 2 years now but it has seen plenty of abuse and many launches with drag radials. Mine was also custom made by a local shop, not ordered from a place that obviously has issues making them. One of these days I'll see if there's any vibrations over 140mph.

 

Two years down the road now, can any of you gents who have had the aluminum driveshaft comment on how it's holding up? Any more noise, vibration, or harshness over time?

I'm on the fence for this modification, mainly with the safety aspect of it (critical speed, requirement of driveshaft safety loop). Otherwise, it sounds like a great modification.

I'd have complete peace of mind ordering the CF one, but it's twice the price of the aluminum one and I doubt I will ever end up boosting my G.

 

There is some guy in Europe that tracks with it... Think it's JAIREN Message him. He's been running it for quite a while b

 

Mine is still fine.

 

Yeah, I track it and run it a high speeds all the time. You can literally cruise the highways in Europe at 120+mph. No problems whatsover.

 

How's your gas mileage? :-)

 

I love my CF driveshaft. The MPG is the same for me. Wish I could have had it on before the SC

 

Is anyone making a CF DS for the sedans?

 

yeah, it's been posted many time already, but Powertrain Industries

 

Crap. About 10-15 at those speeds depending on elevation and wind, but the time saved is worth it. I still get passed like I'm standing still at going 120mph.

I did notice some vibration cruising at around 135mph when I first got the DS, but it has went away.

 

I might be selling my CF, if I sell the car.

 

I think the OEM coupe driveshaft is made in two pieces as a safety feature.
By making it two piece, with the midpoint joint on a breakable bracket/construction, in the event of a front end collision the engine and transmission can move down and under (as intended) and the driveshaft will pop away from the body at that midpoint joint.

If that's true, using a one piece will disturb the design which is supposed to allow the engine to move down and under instead of towards the cabin.

 

I have a carbon fiber one piece from the Drive Shaft Shop. It will explode into small pieces under catastrophic failure but will not catapult the car. With the right materials my opinion is that I have good dampening and safety in mind with a CF single piece to include reduced weight. This does come at a price but one of my favorite mods.

My .02

 

In that case, shouldn't affect safety