carbon driveshaft
#4
Rotary Enthusiast
Join Date: Mar 2002
Location: Tuscaloosa, AL
Posts: 1,430
Likes: 0
Received 0 Likes
on
0 Posts
www.rx7.com almost 1k. Does anybody know what the factory d/s wiegh??
Trending Topics
#9
Living life 9 seconds at a time
iTrader: (2)
Join Date: Feb 2001
Location: Abingdon, Md
Posts: 6,541
Likes: 0
Received 0 Likes
on
0 Posts
Stock driveshaft is very small and light. There is no need what so ever to get a carbon fiber one with the exception of saying that you have one. If you drag race, you'll never break the stock one so don't worry.
#10
#12
Living life 9 seconds at a time
iTrader: (2)
Join Date: Feb 2001
Location: Abingdon, Md
Posts: 6,541
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by milkman2k52
so ernieT even if you upgrade all of the other driveline components that break, the driveshaft wont break at 600+ whp and slicks?
so ernieT even if you upgrade all of the other driveline components that break, the driveshaft wont break at 600+ whp and slicks?
#13
Senior Member
Thread Starter
Join Date: Apr 2003
Location: Ft. Lauderdale
Posts: 598
Likes: 0
Received 0 Likes
on
0 Posts
carbon shaft
ErnieT i was thinking that the reduced weight of the driveshaft would be able to transfer more power similar to a lightened fly, pulleys axels, etc. I thoght that any moving parts that could be made lighter would be benificial. Please correct me if im wrong but every lb saved on a moving part is like saving 3 lbs on a non moving part. I could be wrong. Please write back!!!
#14
Living life 9 seconds at a time
iTrader: (2)
Join Date: Feb 2001
Location: Abingdon, Md
Posts: 6,541
Likes: 0
Received 0 Likes
on
0 Posts
Re: carbon shaft
Originally posted by RageRace
ErnieT i was thinking that the reduced weight of the driveshaft would be able to transfer more power similar to a lightened fly, pulleys axels, etc. I thoght that any moving parts that could be made lighter would be benificial. Please correct me if im wrong but every lb saved on a moving part is like saving 3 lbs on a non moving part. I could be wrong. Please write back!!!
ErnieT i was thinking that the reduced weight of the driveshaft would be able to transfer more power similar to a lightened fly, pulleys axels, etc. I thoght that any moving parts that could be made lighter would be benificial. Please correct me if im wrong but every lb saved on a moving part is like saving 3 lbs on a non moving part. I could be wrong. Please write back!!!
#16
Senior Member
isnt is also good because it absorbs some shock when the clutch is released, i though that and when they break they feather out and dont tear stuff up compared to a steel shaft where they just shear apart and bounce off stuff under the car.
btw how do i fix that my sig comes up everytime when i reply to a message
btw how do i fix that my sig comes up everytime when i reply to a message
#17
FD title holder since 94
iTrader: (1)
Had mine on for a few weeks now and can't say that it was worth it since I did a 4.33 gear at the same time. Total weight savings, not even 3 lbs. So there is a reduction in rotating weight, but since its so close to the center, unlike a flywheel whose weight savings are from the out edges, further away from the center, it won't free up as much hp.
I was running out of things to buy for the car so I got a CF driveshaft. I would do it last and spend the 900 on something else, either for power or the reliability mods.
Tim
I was running out of things to buy for the car so I got a CF driveshaft. I would do it last and spend the 900 on something else, either for power or the reliability mods.
Tim
#19
Junior Member
Join Date: Jan 2002
Location: Denver, CO
Posts: 12
Likes: 0
Received 0 Likes
on
0 Posts
If you are running that fast, as to where you drive shaft would break, you should have a DS Loop installed. These basically cradle your DS without allowing any damage to be done. Good mod IMHO.
Jeremy
Jeremy
#20
Carbon shafts are supposed to reduce the shock on the drivetrain when you dump the clutch (which might help reduce diff/axle breakage). I doubt the rotational inertia difference is a very significant effect since the diameter is pretty small. sbertolone posted this same info already, I am just agreeing with his post on the theory side of things. Perhaps these factors aren't that important if the big drag racers aren't using carbon shafts, however.
-Max
-Max
#21
Senior Member
iTrader: (1)
Join Date: Feb 2001
Location: Charleston, WV
Posts: 610
Likes: 0
Received 0 Likes
on
0 Posts
CF driveshaft will have practically no effect at all on the rotational inertia / driveline losses. First, the diameter is incredibly small and close to the center of rotation. Secondly, the stock piece is already quite light. Third, the weight is after the clutch and tranny which makes the effect even smaller than if the couple of pounds were on the flywheel. The effect of heavy wheels on acceleration is usually overstated, and the effect of the CF driveshaft would be far, far less than wheels.
Even on a couple of equivalent RX-7's (one with the CF and one with the stock steel shaft) jacked up so the rear wheels spin freely - I'd be VERY surprised if you could measure a difference in acceleration of the rear wheels.
There's really no reason to use one in a FD unless you're just looking for something to buy for it. No measureable performance benefit.
Wade
Even on a couple of equivalent RX-7's (one with the CF and one with the stock steel shaft) jacked up so the rear wheels spin freely - I'd be VERY surprised if you could measure a difference in acceleration of the rear wheels.
There's really no reason to use one in a FD unless you're just looking for something to buy for it. No measureable performance benefit.
Wade
#22
Rotary Enthusiast
Join Date: Oct 2002
Location: California, Bay Area
Posts: 1,165
Likes: 0
Received 0 Likes
on
0 Posts
alot of auto manufactures use them as a kind of energy absorber for the engine/trans in a head on collision, of course the car would half to be designed around this.
#23
Senior Member
Join Date: Jul 2001
Location: Kalifornia
Posts: 360
Likes: 0
Received 0 Likes
on
0 Posts
The rotational mass difference between the two drive shafts is not EVEN worth bothering with. The only benefits of a Carbon fiber drive shaft are -
1)It will absorb shock loads from the trans to diff. A very good thing
2)If it breaks, it should not catapult your car into the air, destroy the drive shaft tunnel or chew up your ARSS A very very good thing ( No drive shaft safety loop necessary. )
1)It will absorb shock loads from the trans to diff. A very good thing
2)If it breaks, it should not catapult your car into the air, destroy the drive shaft tunnel or chew up your ARSS A very very good thing ( No drive shaft safety loop necessary. )
#24
Senior Member
Join Date: Jun 2002
Location: Wayward Hayward
Posts: 735
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by red 7
Rx 8 is suppose to have a CF driveshaft stock
and the new 350Z has one too
Rx 8 is suppose to have a CF driveshaft stock
and the new 350Z has one too