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Old 10-07-2004, 03:35 PM   #1
afpdl
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Default Strut failure and Proof the STi rear lsd doesnt do anything

So this weekend one of my jic coilovers snapped in two during an autox(thank God I had a double driver) and I just happened to have a cone cam mounted right behind the offending strut.

http://tyrannoracing.com/Vid/glilly.mpeg

From inside the car it just felt like a snap spin so my codriver put in in 1st and gave it some gas which resulted in absolutly nothing.
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Old 10-07-2004, 03:47 PM   #2
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Still downloading the video.. but if you lost a wheel completely the LSD won't do anything. Since it's a gear-type differential it operates as a torque-multiplier, if there's no torque on one wheel you get nothing.

Edit: Just watched the video. That must make you sick watching the wheel fly out like that.

Last edited by PaulC; 10-07-2004 at 03:53 PM.
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Old 10-07-2004, 03:51 PM   #3
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How long had you had the coilovers? That's crazy..

john
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Old 10-07-2004, 04:00 PM   #4
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PaulC doesn't grasp the sarcasm methinks.
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Old 10-07-2004, 04:11 PM   #5
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Quote:
Originally Posted by ButtDyno
How long had you had the coilovers? That's crazy..

john
Makes you kinda wonder doesn't it John?

Bruce
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Old 10-07-2004, 04:13 PM   #6
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Current discussion in Suspension Forum: http://forums.nasioc.com/forums/showthread.php?t=642564
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Old 10-07-2004, 04:14 PM   #7
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Oh Snap! It was a nice spin to see in person for sure
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Old 10-07-2004, 04:17 PM   #8
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Quote:
Originally Posted by TyrannoSullyRex
PaulC doesn't grasp the sarcasm methinks.
That is correct! Totally missed any sarcasm there.
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Old 10-07-2004, 04:23 PM   #9
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Between 8-12,000 miles. Less then a year.

And yes sarcasm.
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Old 10-07-2004, 04:25 PM   #10
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Quote:
Originally Posted by 04RedWRX
Makes you kinda wonder doesn't it John?
Not really, someone broke a set of Zero2R's at nationals too, and there are tons of people autocrossing on these things. Anything is possible, but some things are unlikely enough that you can't worry about em.

john
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Old 10-07-2004, 04:40 PM   #11
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[quote=ButtDyno]Not really, someone broke a set of Zero2R's at nationals too, and there are tons of people autocrossing on these things. Anything is possible, but some things are unlikely enough that you can't worry about em.

john[quote]

Last edited by afpdl; 10-15-2004 at 08:49 PM.
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Old 10-07-2004, 09:59 PM   #12
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I've seen another STi JIC coilver fail, it was at streets of willow race way, the owner went off track, and the coilover snapped at the strut bolt mounting point.
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Old 10-07-2004, 10:29 PM   #13
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I'm gonna go hug my teins. Yikes.
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Old 10-07-2004, 11:28 PM   #14
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Quote:
Originally Posted by PaulC
Still downloading the video.. but if you lost a wheel completely the LSD won't do anything. Since it's a gear-type differential it operates as a torque-multiplier, if there's no torque on one wheel you get nothing.
The rear diff on the STi is a plate type, not a gear type.

If the CV joint and axle was still stuck to the bent over wheel, it could have prevented forward motion from the other side due to the LSD (revving due to clutch slip...?)

And unless the DCCD had gone into failure mode (due to loss of ABS sensor wire) then there should have been some drive from the front.

Glenn

PS any damage to the diff housing (from the axle trauma?)

Last edited by ANZAC_1915; 10-07-2004 at 11:34 PM.
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Old 10-08-2004, 02:36 AM   #15
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I guess you guys havent seen the pics yet

http://tyrannoracing.com/images/afpdl/ they are the ones titled img_ Pay no attention to the other pics in that file.

The axel pulled completely free. Putting it in first and letting the clutch out slowly just spins the free axel, I didnt want to screw with locking the center diff or anything while the car only had 3 wheels. In the vid we only went to low revs in first, since we didnt feel any forward motion we stopped trying to get the car to move. There is no visible damage to the axel to diff area just axel to wheel.

This weekend ill get up in the air, taken apart, and see if the front is still getting power if not then Ill call it a rwd mod <<Thats sarcasm again

Last edited by afpdl; 10-08-2004 at 02:42 AM.
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Old 10-08-2004, 02:40 AM   #16
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Quote:
Originally Posted by AlpineFD
I've seen another STi JIC coilver fail, it was at streets of willow race way, the owner went off track, and the coilover snapped at the strut bolt mounting point.
Lemme guess, rear strut?
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Old 10-08-2004, 03:40 AM   #17
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just FYI the only **possible** way to drive the car with an axle out and any amount of torque is actually to LOCK the EMCD. think about it. It heats it up, but its doing its job. Obvisouly if you keep driving the crap out of it before long, then it overheats, but you can limp pretty far like that taking care not to overheat it.

you can do it without locking it, but have to be very very gentle with the application of torque, and you have to have more lock, the more torque you apply

a generally loose auto-x setup (which most people seem to run), i.e. towards open or on auto, will almost never work with a shaft off

I'm not talking from armchair experience here.
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Old 10-08-2004, 03:42 AM   #18
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I would tend to agree with you, also not armchair experiance.
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Old 10-08-2004, 04:55 AM   #19
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Wow, you seem really calm about this. I would have been supper pissed. Good luck.
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Old 10-08-2004, 05:01 AM   #20
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And it happened on my 21st bday too. Life goes on, no one got hurt there are worst things that could have happened. Im not happy about it but you got to make the best of what you get, and I cant stop laughing at the video. The car is getting like 6 degrees of positive camber on that run.
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Old 10-08-2004, 05:41 AM   #21
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wow, i know a couple people running JIC coilovers. i guess i better tell them to switch them out immediately.


haha, j/k.
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Old 10-08-2004, 10:34 AM   #22
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Quote:
Originally Posted by patr
just FYI the only **possible** way to drive the car with an axle out and any amount of torque is actually to LOCK the EMCD. think about it. It heats it up, but its doing its job. Obvisouly if you keep driving the crap out of it before long, then it overheats, but you can limp pretty far like that taking care not to overheat it.
Duh, now I realize why auto mode wouldn't have worked.... no wheels rotating means no ABS signals means no detection of slippage.

Glenn
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Old 10-08-2004, 11:59 AM   #23
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You need to tell your co-driver to stop being so afraid of the cones.

Cool video, sucks about the strut failure. Amazing how you just happened to have a video camera right there when it happened.
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Old 10-08-2004, 12:19 PM   #24
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Quote:
Originally Posted by Fred
You need to tell your co-driver to stop being so afraid of the cones.
That was that guy's first time ever to autocross, he's normally a show car guy and we convinced him to come out and co-drive with the owner of the (now) brokeded STI. Hell of a first time.
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Old 10-08-2004, 01:20 PM   #25
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I wonder if he'll do it again?
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