First pass with YSI = broke 6l80 case
02-17-2017, 03:40 PM
#41
Le Mans Master
Contact Pat G.
02-17-2017, 03:41 PM
#42
Le Mans Master
Not sure on the blower but made mid 7s on turbo.
I've spent countless hours studying 6l80e tuning and trying stuff on my car. I feel I have a pretty good handle on it. Not saying there isn't room for improvement but I feel confident in my 6l80 tuning skills at this time. I do agree Pat G is great at what he does though.
I've spent countless hours studying 6l80e tuning and trying stuff on my car. I feel I have a pretty good handle on it. Not saying there isn't room for improvement but I feel confident in my 6l80 tuning skills at this time. I do agree Pat G is great at what he does though.
02-17-2017, 05:00 PM
#45
Le Mans Master
Originally Posted by M M Alexander
Pat G disables it ...
02-18-2017, 08:45 AM
#47
Instructor
Thread Starter
I figure what happened was I flexed the case due to the lack of brace and then it broke the main shaft when the ears snapped.
Century never sent me the email with the information so I'll call them again Monday so I can get the ball rolling. Our winter has been rather soft and seems to almost be over so I wanna get this thing back up so I can drive it and do some local events.
Century never sent me the email with the information so I'll call them again Monday so I can get the ball rolling. Our winter has been rather soft and seems to almost be over so I wanna get this thing back up so I can drive it and do some local events.
02-18-2017, 10:21 AM
#48
Drifting
Called RPM about a 4L60 conversion and I can't ball that hard. Talked to Century and they're gonna send me an email with a list of upgraded parts. That's most likely what will happen. Mike from Century sad he's only seen 3 main shaft failures so they haven't had a reason to develop an upgrade for it.
. See this post:https://www.corvetteforum.com/forums...e-failure.html
I sure hope lightning does not strike twice in the same place!
BIGMAC
1998 (Pictured)
2012 GS (In shop with trashed A6 and Z06 Diff)
02-18-2017, 10:49 AM
#49
Le Mans Master
Going to have to agree it must have something to do with things flexing. I would do a brace and good mounts while it's apart. Could be something to the tuning also. I don't know if they have changed but older tunes I have looked at from century builds have the TM removed completely. Putting some back in will soften the shirt and therefore stress on the trans.
02-18-2017, 08:08 PM
#50
Racer
I assume I am one of the 3 Mike of Century is referring to . See this post:
https://www.corvetteforum.com/forums...e-failure.html
I sure hope lightning does not strike twice in the same place!
BIGMAC
1998 (Pictured)
2012 GS (In shop with trashed A6 and Z06 Diff)
. See this post:https://www.corvetteforum.com/forums...e-failure.html
I sure hope lightning does not strike twice in the same place!
BIGMAC
1998 (Pictured)
2012 GS (In shop with trashed A6 and Z06 Diff)
Im one of the three too... Whos Trans Tune were you using???
Last edited by DEE_Vette; 02-18-2017 at 08:09 PM.
02-18-2017, 09:01 PM
#51
Drifting
When Mike Kurz @ Century fixed the trans broken rear shaft he checked the tune. Mike told me some of his trans module table settings had been changed by the car builder Matt Sorian of the now defunct Florida Speed and Power. Mike did not indicate the changes may have contributed to the shaft failure. He reset the tables to his recommended parameters.
BIGMAC
BIGMAC
02-18-2017, 09:48 PM
#52
Racer
02-18-2017, 09:58 PM
#53
Le Mans Master
Update.... I would love to see your tune if that was possible. I just went over some emails I have from Pat.....and I wasn't wrong. I am even more surprised now because he told me that he agrees keeping some torque management in it is "very important".
Last edited by realcanuk; 02-18-2017 at 10:03 PM.
02-19-2017, 11:15 AM
#54
I agree that's this looks like it's a flexing problem that broke ears off the diff and the separation at the top is what exerted a bending force on the output shaft, causing it to break at its weakest point. This isn't the typical twisting or shearing off of the output shaft that you would expect to see from excessive torque. If that's the case, probably any output shaft (or the back end of the trans) would break under those circumstances, no matter what it was made of. Looking at the pics with those little ears torn off is eye-opening to me. I'm thinking that it makes no sense to have a big beefy gearset, if all that's keeping the diff from trying to rotate and separate from the trans are those two ears.
Man, now I want one of those ECS or Subfloor braces even more than ever!
Man, now I want one of those ECS or Subfloor braces even more than ever!
02-19-2017, 03:39 PM
#55
Le Mans Master
Originally Posted by CI GS
I agree that's this looks like it's a flexing problem that broke ears off the diff and the separation at the top is what exerted a bending force on the output shaft, causing it to break at its weakest point. This isn't the typical twisting or shearing off of the output shaft that you would expect to see from excessive torque. If that's the case, probably any output shaft (or the back end of the trans) would break under those circumstances, no matter what it was made of. Looking at the pics with those little ears torn off is eye-opening to me. I'm thinking that it makes no sense to have a big beefy gearset, if all that's keeping the diff from trying to rotate and separate from the trans are those two ears.
Man, now I want one of those ECS or Subfloor braces even more than ever!
Man, now I want one of those ECS or Subfloor braces even more than ever!
02-19-2017, 04:06 PM
#56
Racer
Dozens of passes with 3.42 gears and 6l80 never an issue... Everyone saying they experienced no wheel hop... Hey maybe it was just time to break... BUT Didnt happen until I upgraded Trans and there was issue with the Tuning strategies.. Second pass..!!! Who really knows... Like BigMac said I think everyone trying to keep lightning from striking twice in the same spot...
Last edited by DEE_Vette; 02-19-2017 at 07:50 PM.
02-19-2017, 04:18 PM
#57
Le Mans Master
Originally Posted by DEE_Vette
Dozens of pass with 3.42 gears and 6l80 never an issue... Everyone says they experienced no wheel hop... Hey maybe it was just time to break... BUT Didnt happen until I upgraded Trans and there was issue with the Tuning strategies.. Second pass..!!! Who really knows... Like BigMac said I think everyone trying to keep lightning from striking twice in the same spot...
02-21-2017, 08:44 AM
#59
if you do decide to come down and Nigel wants the trans bring it and i will take it too him. i live in SC and prob a little over an hour from his shop
02-21-2017, 08:47 AM
#60
Le Mans Master
Will let you know.... I was going to build it as a spare, but never did. After this thread I'm thinking maybe I should keep it in case I ever need the casing.....LOL