996 Turbo / GT2 Turbo discussion on previous model 2000-2005 Porsche 911 Twin Turbo and 911 GT2.

Drag Radials + Bulletproof Driveline = Broken Inner Axle Stub

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  #1  
Old 09-03-2009, 03:13 PM
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Drag Radials + Bulletproof Driveline = Broken Inner Axle Stub

Finally got a chance to work on the Camo car after getting it back from Puerto Rico and dealing with our move to a larger facility. That being said we had an issue with the driveline after lifting the wheels at the drag strip, initially though it related to the GT2 master cylinder, but once we put the car on the lift we foudn this.....

Tilton Clutch + Driveshaft Shop 1000HP Axles + Guard Diff + Mickey Thompson Drag Radial = Theres always always a weak link



Porsche factory inner axle stub decided it didn't like playing that day, replacement on the way and anxious to get this project going again. Looking forward to bringing it out to Mile Marker 1 event in October.

Anyone else had one of these break?
 
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Old 09-03-2009, 03:16 PM
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Old 09-03-2009, 05:48 PM
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perfect shear! nice
 
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Old 09-03-2009, 06:09 PM
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Replace it with an axle that both the inner and outer is made from 300M steel.
 
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Old 09-03-2009, 08:39 PM
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It's happened to me twice. EVOMS has an upgrade that has worked well.
 
  #6  
Old 09-04-2009, 07:48 AM
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that is a clean break!!! Wes good Luck with the project!
 
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Old 09-04-2009, 07:50 AM
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So the Evoms axle's are the only one's that are really bulletproof?
 
  #8  
Old 09-04-2009, 07:52 AM
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Originally Posted by LUISGT3
So the Evoms axle's are the only one's that are really bulletproof?
The part that broke has nothing to do with the Axles, hub was still factory
 
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Old 09-04-2009, 08:20 AM
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Thanks for sharing this with us Wes. I'm guessing that was at around a 5-6K RPM drop??
 
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Old 09-04-2009, 11:05 AM
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This isn't part of the axle itself, the axles held up perfectly fine. This is actually the piece that the inner axle bolts to that goes into the transmission / inner differential. I've been looking for an aftermarket unit, however Guard says they no longer make them, hopefully it was just a fluke occurrence but well see.

Nero was driving the car at the time so I'm not 100% sure of the occurrence but it was likely a 5-6k RPM launch on sticky radials. He slipped the clutch, but apparently came out a bit to quick.
 
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Old 09-04-2009, 11:35 AM
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I think the Porsche Workshop Manual refers to them as stub axles. Like he said. They aren't actually the axles though.
 
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Old 09-04-2009, 11:50 AM
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Good to know it was not the axles.
 
  #13  
Old 09-04-2009, 12:40 PM
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Originally Posted by art4iza
Good to know it was not the axles.
Hopefully it's a 1 time occurance, a result of age/deterioration otherwise bulletproof axles won't be as much of an upgrade for the heavy drag racers.
 
  #14  
Old 09-04-2009, 01:42 PM
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Originally Posted by onelove
This isn't part of the axle itself, the axles held up perfectly fine. This is actually the piece that the inner axle bolts to that goes into the transmission / inner differential. I've been looking for an aftermarket unit, however Guard says they no longer make them, hopefully it was just a fluke occurrence but well see.

Nero was driving the car at the time so I'm not 100% sure of the occurrence but it was likely a 5-6k RPM launch on sticky radials. He slipped the clutch, but apparently came out a bit to quick.
I had the exact same issues. Aftermarket axles held up fine but the hub (not sure if that's the correct term) kept breaking. Don't assume that it's simply fatigue. My brand new stock replacements also broke after one track outing. EVOMS not only has the axles but they have a source for aftermarket hubs.
 
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Old 09-04-2009, 02:54 PM
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Holly SCHNIKES!! That's not good. I hope you find a good replacement. Are you still running 18g on the camo car?
 


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