LS1TECH - Camaro and Firebird Forum Discussion

LS4 Performance Grand Prix GXP | Monte Carlo SS | Impala SS | LaCrosse Super

U-Bend delete

Thread Tools
 
Search this Thread
 
Old 07-18-2010, 02:16 PM
  #1  
Launching!
Thread Starter
 
indynotch50's Avatar
 
Join Date: Mar 2010
Location: Morristown, IN
Posts: 265
Likes: 0
Received 0 Likes on 0 Posts
Default U-Bend delete
Noob question...

Can someone please explain?
indynotch50 is offline  
Reply Like
Old 07-18-2010, 02:29 PM
  #2  
Banned
 
JP_GXP's Avatar
 
Join Date: Dec 2008
Location: Almost Arkansas, LA
Posts: 1,737
Likes: 0
Received 0 Likes on 0 Posts
Default
In your exhaust line there is a u-bend which restricts flow, replacing it with a straight pipe improves flow.

The u-bend for mine is actually a dent.


Others are just a pipe bent down then back up.
JP_GXP is offline  
Reply Like
Old 07-18-2010, 02:54 PM
  #3  
Launching!
Thread Starter
 
indynotch50's Avatar
 
Join Date: Mar 2010
Location: Morristown, IN
Posts: 265
Likes: 0
Received 0 Likes on 0 Posts
Default
Oh ok! Thanks. I'm going to be replacing that section with a test pipe when I do my headers.

But thanks again for the information.
indynotch50 is offline  
Reply Like
Old 07-18-2010, 03:22 PM
  #4  
TECH Resident
iTrader: (1)
 
StealthV8's Avatar
 
Join Date: May 2008
Location: Ontario, Canada
Posts: 763
Likes: 0
Received 0 Likes on 0 Posts

Default
StealthV8 is offline  
Reply Like
Old 07-18-2010, 10:56 PM
  #5  
TECH Enthusiast
 
SSCoop's Avatar
 
Join Date: Jan 2010
Location: Sicklerville, NJ
Posts: 646
Likes: 0
Received 0 Likes on 0 Posts
Default
i was a little confused about the u bend as well..is it near the cat or something?
SSCoop is offline  
Reply Like
Old 07-18-2010, 11:04 PM
  #6  
TECH Fanatic
 
Kazmaniac's Avatar
 
Join Date: Oct 2006
Posts: 1,190
Likes: 0
Received 0 Likes on 0 Posts
Default
Originally Posted by SSCoop
i was a little confused about the u bend as well..is it near the cat or something?
Yes - Stealth's pic is the downpipe / cat assy, I haven't seen one like JP's.

If you have one like Stealth's its not that bad - the squashed ones are some f'd up work.
Kazmaniac is offline  
Reply Like
Old 07-18-2010, 11:22 PM
  #7  
TECH Fanatic
iTrader: (5)
 
williamGT's Avatar
 
Join Date: Jul 2008
Location: Yellowknife NT Canada
Posts: 1,467
Likes: 0
Received 0 Likes on 0 Posts

Default
I have the same as JP's.
williamGT is offline  
Reply Like

Trending Topics

Old 07-19-2010, 12:38 AM
  #8  
TECH Fanatic
 
Kazmaniac's Avatar
 
Join Date: Oct 2006
Posts: 1,190
Likes: 0
Received 0 Likes on 0 Posts
Default
Mine is like Stealth's (mid '06 production). Wonder why they went to that one?
Kazmaniac is offline  
Reply Like
Old 07-19-2010, 12:46 AM
  #9  
TECH Addict
iTrader: (5)
 
AlabamaGuy's Avatar
 
Join Date: Jun 2009
Posts: 2,802
Likes: 0
Received 0 Likes on 0 Posts
Default
Originally Posted by Kazmaniac
Mine is like Stealth's (mid '06 production). Wonder why they went to that one?
Looks much less restrictive. Mine's the same one.
AlabamaGuy is offline  
Reply Like
Old 07-19-2010, 05:57 AM
  #10  
Launching!
iTrader: (2)
 
Tappeter's Avatar
 
Join Date: Mar 2009
Location: Central NY State
Posts: 257
Likes: 0
Received 0 Likes on 0 Posts
Default
Mine was the "dent" like JP's. (07 Monte SS) I have the Hogan down pipe now though, big difference.
Tappeter is offline  
Reply Like
Old 07-19-2010, 10:10 AM
  #11  
TECH Enthusiast
 
SSCoop's Avatar
 
Join Date: Jan 2010
Location: Sicklerville, NJ
Posts: 646
Likes: 0
Received 0 Likes on 0 Posts
Default
where can i get a down pipe at? i've seen a magnaflow hi flow cat is that just as good?
SSCoop is offline  
Reply Like
Old 07-19-2010, 10:16 AM
  #12  
TECH Addict
iTrader: (5)
 
94ss06gxp's Avatar
 
Join Date: Aug 2009
Location: Mid MI
Posts: 2,351
Likes: 0
Received 0 Likes on 0 Posts
Default
so are you guys suggesting that 05-06 LS4's have the same DP as Stealths'? and 07+ have the same as JP's?
94ss06gxp is offline  
Reply Like
Old 07-19-2010, 12:17 PM
  #13  
TECH Resident
iTrader: (1)
 
fieroguru's Avatar
 
Join Date: Feb 2010
Location: Champaign, IL
Posts: 829
Received 211 Likes on 103 Posts

Default
I wonder what the engineers at GM were thinking when they did that? Probably just another means (like the intake) of detuning the LS4 for the 4T65..
fieroguru is offline  
Reply Like
Old 07-19-2010, 12:36 PM
  #14  
TECH Enthusiast
 
Bryan921SS's Avatar
 
Join Date: Jun 2008
Location: Zeeland, MI
Posts: 621
Likes: 0
Received 1 Like on 1 Post

Default
All W-Bodies with the LS4 and 3800 II/III have a U-Bend.

I am not sure if the 3100 and 3400/3500 W-Bodies had the U-Bends...
Bryan921SS is offline  
Reply Like
Old 07-19-2010, 01:23 PM
  #15  
TECH Fanatic
iTrader: (2)
 
CenTexSS's Avatar
 
Join Date: Feb 2009
Location: Killeen, Texas.
Posts: 1,398
Likes: 0
Received 0 Likes on 0 Posts
Default
Originally Posted by fieroguru
I wonder what the engineers at GM were thinking when they did that? Probably just another means (like the intake) of detuning the LS4 for the 4T65..
The u-bend is for clearance for the o2 sensor. Our crappy intake is to make clearance for the OPSU.
CenTexSS is offline  
Reply Like
Old 07-19-2010, 01:30 PM
  #16  
TECH Enthusiast
iTrader: (4)
 
Nick_Nasty's_GXP's Avatar
 
Join Date: Dec 2009
Location: Buffalo NY
Posts: 725
Likes: 0
Received 0 Likes on 0 Posts
Default
Mine is like Stealth's. All I can say is that I can't wait for my catless DP to come in!! The u-bend on my 02 MCSS was really bad. I bought a catted DP for it and it made a huge difference.
Nick_Nasty's_GXP is offline  
Reply Like
Old 07-19-2010, 01:46 PM
  #17  
TECH Fanatic
 
Kazmaniac's Avatar
 
Join Date: Oct 2006
Posts: 1,190
Likes: 0
Received 0 Likes on 0 Posts
Default
Originally Posted by 94ss06gxp
so are you guys suggesting that 05-06 LS4's have the same DP as Stealths'? and 07+ have the same as JP's?
Looks like an engineering change was done mid-run if that holds up.

Just as bad as that smashed Y-pipe on my '02 Camaro SS.
Kazmaniac is offline  
Reply Like
Tags
Back to Subforum
LS4 Performance
View Next Unread
WTB: Front Grand Prix GXP Wheel with Tire




Advanced Search
Quick Reply: U-Bend delete


Reply Closed Thread Share

All times are GMT -5. The time now is 03:01 PM.