Quote:
Originally Posted by Dimman
My buddy had a CF driveshaft grenade on him. Wasn't pretty. Not sure but we think it was from a bad fit between the CF tube and metal yoke part covered by too much adhesive.
Ever since then I've been a bit leery of half-engineered driveshafts. Learning that the harmonic stuff is weird, aluminum's fatigue properties, and how welding it adds stress risers while removing initial heat treat strength has been enough for me to get uncomfortable looking at a few aluminum DS in the past.
Are these things you're interested in discussing, Stu (in your inside voice)?
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Keep in mind that the failure mode of a CF driveshaft is by far the BEST out of all the materials used. It effectively becomes a very large broom
Quote:
Originally Posted by industrial
Yes but if there wasn't a real performance benefit, it wouldn't exist on the OEM level in such ubiquity. Most OEMs would just pass the savings (from a steel driveshaft over megabucks cf) on to profits. I find it hard to believe that any OEM would go to any length to spend more money on the driveshaft for marketing. It's under the car and over the exhaust. The customer will never see it or feel the difference (because a steel one was never installed). Also, just because you can't trust the marketing department at Audioquest cables doesn't mean you can't trust all corporate sources.
This discussion is beyond futile here. There are countless books and sources that say reducing rotating mass (to include the driveshaft) is beneficial for a performance car. Almost every OEM does this. There are aftermarket driveshafts available for almost every performance car foreign and domestic, that doesn't come with one. It's not like lightweight driveshafts are something new that came along with the ft86. People in other car communities pay 2-5x more for lighter and more exotic driveshafts.
Since we are beyond the polite stage, all the math in this thread is nearly worthless for this discussion. As I've said over and over, you need modeling software specific to this application that the OEMs have to demonstrate mathematically whether this mod is "worth it". I'm not sure why these few guys are so vehemently defending their position that this mod is not "worth it" since none of them have any real world experience with this mod. Don't know why I'm still here.
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The same reason they still put crossdrilled rotors on performance cars...