500HP+stock flexplate=this - LS1GTO.com Forums

Vendors


Go Back   LS1GTO.com Forums > GTO Tech > Drivetrain

Reply
 
Thread Tools Rate Thread
Old 11-12-2012, 03:03 AM   #1
04QSMGoat
Registered User
 
04QSMGoat's Avatar
 
2004 GTO Owner

Join Date: Apr 2012
Location: Orange County, CA
Posts: 743


Offline
500HP+stock flexplate=this

About a month ago I developed a loud metallic clunk at idle. Turns out my flexplate was broken. The crack went under the bolts so luckily it didn't separate on me. Bottom line A4 guys don't skimp when you upgrade your trans.

__________________
2004 QSM GTO: Forged 347, bolt ons, stalled auto PHK
  Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 11-12-2012, 03:29 AM   #2
87LC2
Dr. Mantis Toboggan
 
87LC2's Avatar
 
2006 GTO Owner

Join Date: Sep 2006
Location: Pennsyltucky
Posts: 12,916
Premium Member


Offline
Good idea to upgrade.

I've actually seen this on a stock set-up.
__________________
The Anti-Prius™
2008 JSB/Black M6 1LT
Kooks, catless, NPP
Vararam
  Reply With Quote Quick reply to this message
Old 11-12-2012, 12:21 PM   #3
MuhThugga
Poppycock
 
MuhThugga's Avatar
 
2004 GTO Owner

Join Date: Jul 2005
Location: Hockessin, DE
Posts: 9,897


Offline
Oops.
__________________

PROJECT SILVERBACK IS COMPLETE!!!
Quote:
Originally Posted by MVDCGTO...View Post
Squeezing another 50 rwhp out of one of those setups would be like trying to squeeze the sarcasm out of MuhThugga. . . . . . . . not gonna happen

  Reply With Quote Quick reply to this message
Old 11-12-2012, 12:32 PM   #4
mistermike
10-4
 
mistermike's Avatar
 
2004 GTO Owner

Join Date: Dec 2003
Location: Cleveland
Posts: 20,655
GKPW52

Offline
I'm surprised it failed. I've seen lots more power than that on a stock 4L60.
__________________
http://i67.photobucket.com/albums/h306/MikeStainlessWorks/SigPicAniSm.gif
World's First Twin Screw Pontiac GTO

Blown H/C 408 and other stuff. Billet tires. Plasti Dip tints. Stage 3 keyboard. /////.
2008 HHR SS tweaked
2003 CTS w/ dead hooker in spacious trunk
fquick
  Reply With Quote Quick reply to this message
Old 11-12-2012, 01:28 PM   #5
esau999
O_o
 
esau999's Avatar
 
2006 GTO Owner

Join Date: Oct 2010
Location: DPTX
Posts: 1,347
Premium Member


Offline
What flexplate did you replace it with?
__________________
4xx/4xx your guess is as good as mine
  Reply With Quote Quick reply to this message
Old 11-12-2012, 02:14 PM   #6
04QSMGoat
Registered User
 
04QSMGoat's Avatar
 
2004 GTO Owner

Join Date: Apr 2012
Location: Orange County, CA
Posts: 743


Offline
Ive also seen one fail on a stock motor. I replaced it with a B&M
  Reply With Quote Quick reply to this message
Old 11-12-2012, 02:24 PM   #7
wrp
Taco Bell
 
wrp's Avatar
 
2004 GTO Owner

Join Date: Feb 2005
Location: Texas
Posts: 14,308
Premium Member


Offline
Iused a Meziere

__________________
All comments are bullshit, all posts fictional (cough cough)

"ZOMG, boost it to the moon, it can handle it"

Mods: A bumble bee is considerably faster than a John Deere tractor.
  Reply With Quote Quick reply to this message
Old 11-12-2012, 04:12 PM   #8
J Burna
The Peacemaker
 
J Burna's Avatar
 
2006 GTO Owner

Join Date: Aug 2007
Location: Ft. Lauderdale,Ft.Myers FL.
Posts: 1,102


Offline
Quote:
Originally Posted by mistermike...View Post
I'm surprised it failed. I've seen lots more power than that on a stock 4L60.

+1. What causes this? Bad harmonics? crank movement?
__________________
IBM 06 A4 1 of 278


Our hobby makes no sense honestly.
Steel Chicken
Not driving your GTO to keep miles off of it is like not having sex with your girlfriend so her next boyfriend will appreciate it more.
  Reply With Quote Quick reply to this message
Old 11-12-2012, 04:31 PM   #9
Big Tex
Seeking additional traction..
 
Big Tex's Avatar
 
2005 GTO Owner

Join Date: Aug 2010
Location: Virginia Beach
Posts: 719


Offline
Bummer. I despise power induced breakage!


Sent from my iPhone using Autoguide.com App
__________________

'05 M6- D-1SC / AES 390 / Tick Lvl 4 trans and MC / Centerforce DYAD / GForce1320 9" and coilover kit / Strange S-Trac / Kooks / BC 8K fronts / VMR V718s / Nitto NT05
'06 A4- 419/386. Volant/FAST 92/SLP LTs/Magnaflow CB/DBA/Hawk/ATI Stall/Pedders Xa/Energy Suspension/DMH//G-Force *SOLD*
  Reply With Quote Quick reply to this message
Old 11-13-2012, 06:17 AM   #10
KO6GTO
Banned
 
KO6GTO's Avatar
 
Lumina SS

Join Date: Oct 2012
Location: none
Posts: 252


Offline
Hmmm over on other forums I see claims that 4l60's are good to 600hp
Must be complete bs
  Reply With Quote Quick reply to this message
Old 11-13-2012, 06:25 AM   #11
Monsta
Registered User
 
2006 GTO Owner

Join Date: Nov 2008
Location: Keller, Tx
Posts: 3,315


Offline
Send a message via AIM to Monsta
Quote:
Originally Posted by mistermike...View Post
I'm surprised it failed. I've seen lots more power than that on a stock 4L60.

Agree. I put 800 pounds of torque through mine when I had nitrous.

That flexplate looks like the old version. I have the new version that is stronger for sale in the for section for $50 if you need one. It is in perfect condition.
__________________
2011 White Pearl CTS-V
Bone Stock 11.73@117.06

2006 GTO - Parted out
LS2 447:
All Motor 6.29@107 with a headwind
LS2 427:
All Motor 10.02@132.91
http://www.youtube.com/watch?v=gtlsAQCqABk
  Reply With Quote Quick reply to this message
Old 11-13-2012, 07:00 AM   #12
Steel Chicken
L33T IT Direktor, Excel PhD
 
Steel Chicken's Avatar
 
2004 GTO Owner

Join Date: Dec 2004
Location: Magrathea
Posts: 19,886
Premium Member


Offline
Quote:
Originally Posted by KO6GTO...View Post
Hmmm over on other forums I see claims that 4l60's are good to 600hp

Sure, for a few thousand miles.
__________________
2004 GTO, Stock LS1 internals, donkey dick cam, mega-ultron space heater @ 14PSI, ETP heads, exhaust thingies and other stuffs. 742 RAWRZORS.


Quote:
Justice is swift and unfair in the eyes of those who don't know shit. - tmiller

  Reply With Quote Quick reply to this message
Old 11-13-2012, 08:35 AM   #13
87LC2
Dr. Mantis Toboggan
 
87LC2's Avatar
 
2006 GTO Owner

Join Date: Sep 2006
Location: Pennsyltucky
Posts: 12,916
Premium Member


Offline
Quote:
Originally Posted by KO6GTO...View Post
Hmmm over on other forums I see claims that 4l60's are good to 600hp
Must be complete bs

We realize the flex plate is not a part of the transmission, right?
  Reply With Quote Quick reply to this message
Old 11-13-2012, 09:53 AM   #14
04QSMGoat
Registered User
 
04QSMGoat's Avatar
 
2004 GTO Owner

Join Date: Apr 2012
Location: Orange County, CA
Posts: 743


Offline
Again, I already put in a B&M plate.
  Reply With Quote Quick reply to this message
Old 11-13-2012, 10:40 AM   #15
J Burna
The Peacemaker
 
J Burna's Avatar
 
2006 GTO Owner

Join Date: Aug 2007
Location: Ft. Lauderdale,Ft.Myers FL.
Posts: 1,102


Offline
What causes this, and is this something we have to worry about?
  Reply With Quote Quick reply to this message
Old 11-13-2012, 03:47 PM   #16
ofallon gto
Registered User
 
2004 GTO Owner

Join Date: Sep 2011
Location: O Fallon mo
Posts: 24


Offline
anyway to check this without taking car apart?
__________________
kooks ss,flowmaster cat-back,K&Ncai,SLP Predator Hayden trans cooler,Braided lines, TCI deep pan. Weldcraft widened 17s275"s,Harland Sharp1.8 rockers,Comp cams hardened 7.4 pushrods.LS-6 valve springs Always working on something. Pulse Red/Black A4 rear spoiler delete.2 coats of wax
  Reply With Quote Quick reply to this message
Old 11-13-2012, 04:46 PM   #17
Big Tex
Seeking additional traction..
 
Big Tex's Avatar
 
2005 GTO Owner

Join Date: Aug 2010
Location: Virginia Beach
Posts: 719


Offline
No. Take off the transmission to peek.
  Reply With Quote Quick reply to this message
Old 11-13-2012, 04:55 PM   #18
Tims05
Registered User
 
Tims05's Avatar
 
2005 GTO Owner

Join Date: Jun 2005
Location: north plainfield, nj
Posts: 1,149


Offline
Send a message via AIM to Tims05
After seeing a buddies stock flexplate on his 04 h/c/i car and saw his cracked to hell (luckly didn't fall apart) I upgraded mine to a TCI flexplate when I pulled my trans to get rebuilt. Just alittle added insurance in the end even if the stock one was never going to fail.
  Reply With Quote Quick reply to this message
Old 11-13-2012, 07:34 PM   #19
04QSMGoat
Registered User
 
04QSMGoat's Avatar
 
2004 GTO Owner

Join Date: Apr 2012
Location: Orange County, CA
Posts: 743


Offline
Umm the inspection hole gave me a clear view of the crack. I wouldn't say it's something to worry about but if you pull the Trans for any reason spend $100 on an upgraded one. It's stamped steel so repeated abuse will wear it out. GM high tech posted pics of their twisted control arms on their 2010 Camaro.
  Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the LS1GTO.com Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Rate This Thread
Rate This Thread:

Posting Rules
You may post new threads
You may 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

Forum Jump


All times are GMT -8. The time now is 01:10 AM.




Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright ©2003-2008, LS1GTO.com
Site Banner Design ©2005-2007, Cylosoft

LS1GTO.com is not affiliated with General Motors Corp.