When considering going to a carbon fiber driveshaft it might be interesting to note that the stocker for an automatic (which is slightly bigger than 5spd) weighs 14.5lbs in a box!

The stock intake manifold, upper, lower and throttle body weighs about 23lbs in a box...

 

how much does the CF shaft way?

 

Yes, but all of those "weight nuts" will argue that you can't compare rotational and stationary weight like that.

Still going to be hard to beat 14.5 lbs.

 

I'm not comparing, I'm just mentioning them in the same post. I'm aware of the difference in rotational weight and stationary weight.

 

Forget rotational weight, let's talk about rotational and unsprung weight combined!

 

CF = 10.8lbs
http://www.rx7.com/cgi-local/3catalog.cgi?cat=2&part=6
but for $949 you can't go wrong with stock.

 

I still wonder how Resource got his FD weight down to 2400 lbs.
Totally crazy!

 

Complete rear seat assembly weighs 22kg (48.5lb). I was amazed as they feel so light, but all the little mounts, hinges, clips all add up. I havent even taken off the inertia reels for them yet so there's even more weight to come.

What does the bin assembly weigh?

Taking weight off the back of the car seems a lot easier than taking it off the front

-pete

 

Sway bars are made out of steel right? I wonder if anybody makes a carbon fiber or titanium 6-4 bar

 

My R1 with JDM rear seat, full tank of gas, cruise control added, factory CD, Eibach springs, 51R battery, M2 stage 3 weighed 2796lbs at an SCCA event.


Jeff

 

the bins are about 7 pounds. all i had was a bathroom scale nothing too accurate. they arent really worth removing for weight but damn i can fit so much more stuff back there without them.

neither carbon nor ti are very well suited for a sway bar, too brittle.

 

titanium is not too brittle.....are you on crack?! We are talking about titanium.........its light weight yet very......VERY strong! Top that, o and it very expensive

 

yes ti is strong but it can also be brittle. it is very susceptible to fatigue and a swaybar is constantly being flexed (torsionally). its very similar to aluminum. take a piece of aluminum and bend it back and forth a few times. this effect becomes much worse as soon as a rock hits it and puts a gouge in it.

and besides, ti is a little lighter than steel but not a lot. it is heavier than aluminum. in order to save weight you would have to make the bar much smaller. and regardless of material a smaller diameter bar will have a much lower torsional strength. this is why aftermarket swaybars are much thicker.

 

You need to take a materials class....materials can be very strong in tension or in torsion yet be very brittle. They are completely different properties of a material.

 

Actually Titanium is considered the perfect spring material. I dosen't fatigure like steel springs will as well as it is much lighter. Hence there use as valve springs as as sway bars for champ cars and springs for other high end race cars. It just expensive, hard to weld, and hard to manufacture. Just my experience.

 

yeah youd think if they could withstand constant 4-6k rpms from a LS6, theyd be ok for sway bars as far as fatigue and brittleness goes.

-Zach