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BMW 3-Series (E90 E92) Forum
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Carbon Fiber Driveshaft
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07-15-2009, 12:14 PM | #1 |
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Carbon Fiber Driveshaft
Found these guys: http://www.pstds.com/carbonfiber.htm
In some applications CF drive shafts reduce rotating mass by as much as 30lbs. If I recall, the last Z used a CF drive shaft. |
07-15-2009, 12:29 PM | #2 |
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Yep the 350z uses a CF reinforced driveshaft. Super strong, I have never heard of anyone breaking it and I had friends putting down 620 RWHP on upgraded engine components and TT.
Just another way to put down more power to the wheels, just like a Crankshaft Pully, Lightened Flywheel, lighter rear wheels/rotors, etc. Way more effective to lose weight on anything that spins I think our driveshaft must be fairly light though, I have heard the 6MT only loses about 11-12% to the wheels which is rediculously low. |
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07-15-2009, 12:42 PM | #3 | |
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It seems like pstds is primarily pushing the strength aspect of their CF DS for high-HP applications. The "HP gain" you'd get from a lighter driveshaft would only really come into play as the car was accelerating and it would probably be pretty small outside of 1st gear similar to lightweight rotating parts (flywheel, crank pulley etc). Looking at the prices for the 3000GT and other imports on their page, my guess is once you said "BMW", a price quote would probably come back north of $1000.
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07-15-2009, 01:00 PM | #4 | |
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A carbon shaft will help reduce parasitic loss, but it will also reduce torque (to an extent of course) A loop would be a good idea too just as a safety precaution.
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07-15-2009, 01:33 PM | #6 |
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Why use a loop with a CF shaft? If it breaks it will effectively disintegrate as it hits the pan+pavement unlike those made of steel or Al.
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07-15-2009, 01:36 PM | #7 | |
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Yes a loop is better suited for Aluminum or Steel shafts, but for a high horse power car and a CF shaft, a loop should still be used for safety. Its a very small price to pay and not a difficult thing to fabricate for added safety.
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07-15-2009, 01:53 PM | #9 | |||
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07-15-2009, 03:04 PM | #11 |
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They look good. But we dont have a need for them untill were hitting 600+ HP at the wheels. Maybe once the turbo upgrades and tuning is done for them.
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07-15-2009, 03:55 PM | #12 |
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Where are you getting that number from?
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07-15-2009, 06:26 PM | #14 |
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remember the driveshaft is an assembly -- 2 piece with a center support
sooner or later IT WILL be the weak link in transmitting huge amounts of torque to the rear wheels .. dont know if that 600hp number is substantiated .. but youll know your there when you shred the flex coupling or snap a yoke |
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07-15-2009, 09:31 PM | #16 |
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12-06-2009, 01:22 PM | #19 | |
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12-06-2009, 01:46 PM | #20 |
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Might be a good solution for those swapping final drives to M3 pumpkins (because that requires shortening the driveshaft a bit).
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