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First pass with YSI = broke 6l80 case

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Old 02-21-2017, 09:49 AM   #61
JMURDOCK20
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right! when i saw nigel post the picture of the vette on a role back it was heartbreaking
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Old 02-21-2017, 11:41 PM   #62
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Were you able to look at any of the tunes?
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Old 02-22-2017, 12:18 AM   #63
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Quote:
Originally Posted by bmfvette
Were you able to look at any of the tunes?
If you're asking me, no. Haven't seen anything from those that broke.
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Old 02-22-2017, 08:45 PM   #64
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If you're asking me, no. Haven't seen anything from those that broke.
I would also like to see your comments on those, if you get an opportunity to look at any of them.
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Old Yesterday, 10:32 AM   #65
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It seems you guys are pretty focused on the tuning as the cause of failure. I'm not saying you're wrong, or that it can't be. But, from what I've seen and experienced, the pattern goes like this.

Ears break.
output shaft breaks
case breaks.

A brace will (should) help tremendously to stop the rotation of the diff.

Managing the tq output can also help to reduce the rotation of the diff.

For what it's worth, I have a TH400 in my car mated to the C6 diff. Multiple trans brake launches in the low 1.3 60' and foot brake launches into the 1.2s and it's holding together fine. Of course, I have a 2.48 1st gear. What does the 6L80 have?

Good luck with your repairs fellas.
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Old Yesterday, 01:14 PM   #66
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Quote:
Originally Posted by Capthuff View Post
It seems you guys are pretty focused on the tuning as the cause of failure. I'm not saying you're wrong, or that it can't be. But, from what I've seen and experienced, the pattern goes like this.

Ears break.
output shaft breaks
case breaks.

A brace will (should) help tremendously to stop the rotation of the diff.

Managing the tq output can also help to reduce the rotation of the diff.

For what it's worth, I have a TH400 in my car mated to the C6 diff. Multiple trans brake launches in the low 1.3 60' and foot brake launches into the 1.2s and it's holding together fine. Of course, I have a 2.48 1st gear. What does the 6L80 have?

Good luck with your repairs fellas.
There's ABSOLUTELY nothing whatsoever in the tune that could have caused this. If my somebody put a gun to my head and forced me to try and tune a car specifically to have something like this happen it simply can't be done.
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Old Yesterday, 01:46 PM   #67
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Quote:
Originally Posted by subfloor@centurytrans View Post
There's ABSOLUTELY nothing whatsoever in the tune that could have caused this. If my somebody put a gun to my head and forced me to try and tune a car specifically to have something like this happen it simply can't be done.
I'm not suggesting it fully the fault of the tune. I am just thinking that a harder shift could contribute though.

I agree its more related to stress on the case by not having a brace and/or good mounts.

Good thing you made us those braces.......
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Old Yesterday, 01:56 PM   #68
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It was stated earlier in the thread that it was due to flex of the case and the intermediate shaft breaking. I don't think anybody thinks you can tune to break the ears or the case.

The tune came up during the torque management discussion.

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