Aluminum Driveshaft - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


General Miata Chat A place to talk about anything Miata

Reply
 
 
 
LinkBack Thread Tools
Old 10-27-2009, 02:48 PM   #21
Elite Member
iTrader: (5)
 
Join Date: Apr 2007
Location: Wellford, SC
Posts: 1,704
Total Cats: 1
Default

That is one of the bad things about either aluminum or steel driveshafts as hustler stated... They do have the capability to punch through the floorpan and hit/impale the occupants in the case of a shear as seen in the photos above. However, when a carbon fiber one breaks/shears like that one it just becomes harmless fibers that cause no additional damage. In saying that, should you buy a carbon fiber one for this safety reason? HELL NO! Will you be putting enough torque on your driveshaft to shear it in normal racing conditions? HELL NO! So I would not worry about this unless you expect either your transmission or rear end to complete lock up while at high speed. But I would just replace the U-joints since they are servicable on your driveshaft.... Just my $0.02.
thagr81 us is offline   Reply With Quote
Old 10-27-2009, 03:23 PM   #22
Senior Member
iTrader: (5)
 
Join Date: Jan 2008
Location: Central, TX / Bay area, CA
Posts: 1,272
Total Cats: 3
Default

Ive only seen them do this while launching at the drags.
Gotpsi? is offline   Reply With Quote
Old 10-27-2009, 03:30 PM   #23
Elite Member
iTrader: (12)
 
Join Date: May 2007
Location: Austin, TX
Posts: 1,923
Total Cats: 0
Default

Quote:
Originally Posted by Ben View Post
IIRC standard 1.8 shaft is 11lbs
I just weighed my spare and it indeed is 11lbs.
JayL is offline   Reply With Quote
Old 10-27-2009, 03:53 PM   #24
Ben
Supporting Vendor
iTrader: (33)
 
Ben's Avatar
 
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,689
Total Cats: 99
Default

My memory is good to the best I can remember.
Ben is offline   Reply With Quote
Old 10-27-2009, 03:56 PM   #25
Elite Member
iTrader: (5)
 
Join Date: Apr 2007
Location: Wellford, SC
Posts: 1,704
Total Cats: 1
Default

Quote:
Originally Posted by Gotpsi? View Post
Ive only seen them do this while launching at the drags.
Exactly my point...
thagr81 us is offline   Reply With Quote
Old 10-27-2009, 04:40 PM   #26
Elite Member
iTrader: (12)
 
Join Date: Aug 2006
Location: Central-ish VA
Posts: 4,449
Total Cats: 16
Default

Quote:
Originally Posted by thagr81 us View Post
That is one of the bad things about either aluminum or steel driveshafts as hustler stated... They do have the capability to punch through the floorpan and hit/impale the occupants in the case of a shear as seen in the photos above.
This is why you weld in driveshaft hoops around the shaft. So that it can not do that.
neogenesis2004 is offline   Reply With Quote
Old 10-27-2009, 04:54 PM   #27
Elite Member
iTrader: (5)
 
Join Date: Apr 2007
Location: Wellford, SC
Posts: 1,704
Total Cats: 1
Default

Quote:
Originally Posted by neogenesis2004 View Post
This is why you weld in driveshaft hoops around the shaft. So that it can not do that.
Indeed. However, there are a lot of budget builders who take their cars out to the track and fully overlook this and the results can be devastating... Well at least I've seen three at a local drag strip break their driveshafts and have them punch through the floorpan. Not pretty... All were un-injured though.
thagr81 us is offline   Reply With Quote
Old 10-27-2009, 04:56 PM   #28
Supporting Vendor
iTrader: (31)
 
Savington's Avatar
 
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 14,357
Total Cats: 1,322
Default

Quote:
Originally Posted by Gotpsi? View Post
Ive only seen them do this while launching at the drags.
I thought that too, but that's definitely one of the garages at ACS Roval, and those are R888s on that car.
Savington is offline   Reply With Quote
Old 10-27-2009, 10:05 PM   #29
Elite Member
iTrader: (2)
 
miata2fast's Avatar
 
Join Date: Aug 2009
Location: Dover, FL
Posts: 2,895
Total Cats: 109
Default

I thought the more common accidents with driveshafts, are when they break and impale the ground. This can make the car flip over. Not pretty. Do they not tech cars for driveline loops in road racing? They sure as hell do in drag racing.
miata2fast is offline   Reply With Quote
Old 10-27-2009, 11:20 PM   #30
Junior Member
Thread Starter
 
Join Date: Aug 2008
Location: Los Angeles, CA
Posts: 79
Total Cats: 0
Default

Quote:
Originally Posted by JayL View Post
I just weighed my spare and it indeed is 11lbs.
From what I gather so far, the Al replacement is around 7-8lbs and OEM steel replacement is about 11-12lbs. I'm still taking in more opinions and time before I settle on a replacement. So far, I'm leaning towards the steel replacement or finding a used OEM shaft. IMO, MOI for the weight difference on such a small radius wouldn't provide much in performance gains.
VagaXt is offline   Reply With Quote
Old 10-27-2009, 11:27 PM   #31
Elite Member
iTrader: (12)
 
Join Date: Aug 2006
Location: Central-ish VA
Posts: 4,449
Total Cats: 16
Default

I would estimate that the "gains" would not be measurable on a dyno, or in any datalogs of acceleration.
neogenesis2004 is offline   Reply With Quote
Old 10-29-2009, 12:25 AM   #32
MT Pony Underground
iTrader: (6)
 
Nagase's Avatar
 
Join Date: May 2009
Posts: 1,811
Total Cats: 0
Default

Every pound counts, especially rotating mass.

Has anyone seen aluminum driveshafts impale/flip cars, or just steel units?
Nagase is offline   Reply With Quote
Old 10-29-2009, 04:53 AM   #33
Junior Member
iTrader: (1)
 
Join Date: May 2009
Posts: 120
Total Cats: 0
Default

I had alu drive shaft on my previous car, s13. it is quite noticeably different from stock but I dotn think i would bother with one from now on, seems a bit unnecessary spending
mekaw is offline   Reply With Quote
Old 10-29-2009, 12:36 PM   #34
Elite Member
iTrader: (2)
 
Join Date: Jun 2006
Location: ABQ, NM
Posts: 1,850
Total Cats: -8
Default

Quote:
Originally Posted by miata2fast View Post
I thought the more common accidents with driveshafts, are when they break and impale the ground. This can make the car flip over. Not pretty. Do they not tech cars for driveline loops in road racing? They sure as hell do in drag racing.



Road racing isn't typically as harsh on drive line components, standing starts are not common.

Some classes do have a safety requirement for a driveshaft loop, and those classes are very much tech'd for it.

HPDE, or track days do not have such a requirement.
BenR is offline   Reply With Quote
Old 10-29-2009, 02:23 PM   #35
Boost Pope
iTrader: (8)
 
Joe Perez's Avatar
 
Join Date: Sep 2005
Location: Chicago (Over two miles from Wrigley Field. Fuck the Cubs. Fuck them in their smarmy goat-hole.)
Posts: 26,317
Total Cats: 1,914
Default

Quote:
Originally Posted by Nagase View Post
Has anyone seen aluminum driveshafts impale/flip cars, or just steel units?
Has anyone seen any driveshaft flip a car?
Joe Perez is offline   Reply With Quote
Old 10-29-2009, 04:22 PM   #36
Elite Member
iTrader: (2)
 
miata2fast's Avatar
 
Join Date: Aug 2009
Location: Dover, FL
Posts: 2,895
Total Cats: 109
Default

I have never seen it, just heard of it. However, I have noticed a certain amount of horseshit from hot rodders. Maybe a myth?
miata2fast is offline   Reply With Quote
Old 10-29-2009, 04:39 PM   #37
Elite Member
iTrader: (5)
 
Join Date: Apr 2007
Location: Wellford, SC
Posts: 1,704
Total Cats: 1
Default

Research edit: MYTH BUSTED!

Mythbuster apparently tried this... Link to results: http://www.mythbustersfanclub.com/mb...nt/view/52/27/

Cliffnotes: The car would jump up off the ground slightly but never flip. All adding speed accomplished was to shove the driveshaft further into the trunk... MYTH BUSTED!
thagr81 us is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
OTS Bilstein to motorsports ASN conversion stoves Suspension, Brakes, Drivetrain 5 04-21-2016 04:00 PM
ACT race clutch and AASCO 7lb. aluminum flywheel graexodus Miata parts for sale/trade 5 10-26-2015 02:48 PM
FS/FT: 03.5 Mazdaspeed Protege leatherface24 Cars for sale/trade 15 10-16-2015 12:35 PM
Moroso Air Oil Separator Catch Can Aroundcorner Miata parts for sale/trade 2 10-01-2015 04:20 PM
Stripped clutch slave bell housing threads. EricJ Suspension, Brakes, Drivetrain 6 09-13-2015 10:44 PM


Tags
aluminum driveshaft

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 12:49 AM.