Forced Induction Superchargers | Turbochargers | Intercoolers

o2 sensors in cross over or downpipe?

Thread Tools
 
Search this Thread
 
Old Feb 8, 2010 | 12:43 AM
  #1  
Snyper's Avatar
Thread Starter
10 Second Club
iTrader: (27)
 
Joined: Nov 2006
Posts: 1,905
Likes: 0
From: Connecticut
Default o2 sensors in cross over or downpipe?

Just trying to figure out where to put my o2 sensors..someone said it wasn't a good idea to put them in the cross over and to put them in the downpipe and some said it was fine....any ideas?

Last edited by Snyper; Feb 8, 2010 at 12:49 AM.
Reply
Old Feb 8, 2010 | 01:01 AM
  #2  
XtremeDime's Avatar
TECH Addict
iTrader: (16)
 
Joined: Jul 2005
Posts: 2,899
Likes: 0
From: Anchorage, ALASKA
Default

1 in each crossover and use a wideband in the DP.
Reply
Old Feb 8, 2010 | 01:06 AM
  #3  
reamo04's Avatar
TECH Enthusiast
iTrader: (9)
 
Joined: Apr 2007
Posts: 536
Likes: 0
Default

if you have both banks in the downpipe, how is the ECU going to account for the different banks running different if they're reading the same thing in the downpipe?

Put them in the crossover, and a wideband in the downpipe
Reply
Old Feb 8, 2010 | 01:29 AM
  #4  
Snyper's Avatar
Thread Starter
10 Second Club
iTrader: (27)
 
Joined: Nov 2006
Posts: 1,905
Likes: 0
From: Connecticut
Default

Thats what I thought..but I was told otherwise by a friend.
Reply
Old Feb 8, 2010 | 02:04 AM
  #5  
XtremeDime's Avatar
TECH Addict
iTrader: (16)
 
Joined: Jul 2005
Posts: 2,899
Likes: 0
From: Anchorage, ALASKA
Default

Kick him in the nuts
Reply
Old Feb 8, 2010 | 02:38 PM
  #6  
reamo04's Avatar
TECH Enthusiast
iTrader: (9)
 
Joined: Apr 2007
Posts: 536
Likes: 0
Default

Originally Posted by XtremeDime
Kick him in the nuts
and then laugh when he puts his in the DP and it doesnt read both banks
Reply
Old Feb 8, 2010 | 06:16 PM
  #7  
098z28's Avatar
12 Second Club
15 Year Member
Photogenic
iTrader: (12)
 
Joined: Mar 2007
Posts: 193
Likes: 0
From: fruitport mi
Default

Originally Posted by reamo04
and then laugh when he puts his in the DP and it doesnt read both banks
lol
Reply
Old Feb 8, 2010 | 08:36 PM
  #8  
black98ws6ta's Avatar
TECH Addict
iTrader: (77)
 
Joined: May 2002
Posts: 2,107
Likes: 2
From: louisville,ky
Default

More then likely a 02 sensor will read alittle off and also fail faster being pre turbo in each bank. I usually tune OL to avoid potential problems.
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

 Verdad Gallardo
story-1

6 Common C5 Corvette Failures and What's Involved In Repairing Them

 Pouria Savadkouei
story-2

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

 Verdad Gallardo
story-3

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-4

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-5

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
story-6

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

 Verdad Gallardo
story-7

Awesome K5 Blazer Restomod Comes With C7 Corvette Power

 Verdad Gallardo
story-8

10 Camaros You Should Never Buy

 
story-9

10 LS Engine Myths That Refuse to Die

 Verdad Gallardo
Old Feb 8, 2010 | 08:38 PM
  #9  
Snyper's Avatar
Thread Starter
10 Second Club
iTrader: (27)
 
Joined: Nov 2006
Posts: 1,905
Likes: 0
From: Connecticut
Default

why?.................
Reply
Old Feb 8, 2010 | 09:00 PM
  #10  
black98ws6ta's Avatar
TECH Addict
iTrader: (77)
 
Joined: May 2002
Posts: 2,107
Likes: 2
From: louisville,ky
Default

Originally Posted by Snyper
why?.................
The pressure differential will cause the arf's to be slightly off, and the heat pre turbo will take its toll on the sensor.

Starting on page 7 of this installation manual for a AEM wideband its say's the same thing. I have read similar in many other places.

http://www.aempower.com/images/produ...%2030-4100.pdf

Or page 5 here:

http://www.innovatemotorsports.com/s...LM1_Manual.pdf

Last edited by black98ws6ta; Feb 8, 2010 at 09:06 PM.
Reply
Old Feb 8, 2010 | 11:15 PM
  #11  
Snyper's Avatar
Thread Starter
10 Second Club
iTrader: (27)
 
Joined: Nov 2006
Posts: 1,905
Likes: 0
From: Connecticut
Default

Why are the factory o2 bungs ON the manifolds on a c6 then? Doesn't seem to make sense.
Reply
Old Feb 8, 2010 | 11:20 PM
  #12  
black98ws6ta's Avatar
TECH Addict
iTrader: (77)
 
Joined: May 2002
Posts: 2,107
Likes: 2
From: louisville,ky
Default

Originally Posted by Snyper
Why are the factory o2 bungs ON the manifolds on a c6 then? Doesn't seem to make sense.
Does a stock c6 come with a turbo? The issue is the turbo causing the backpressure, and heat.
Reply
Old Feb 9, 2010 | 12:42 AM
  #13  
Snyper's Avatar
Thread Starter
10 Second Club
iTrader: (27)
 
Joined: Nov 2006
Posts: 1,905
Likes: 0
From: Connecticut
Default

So what are my other options..how do people usually run them?
Reply
Old Feb 9, 2010 | 11:17 AM
  #14  
black98ws6ta's Avatar
TECH Addict
iTrader: (77)
 
Joined: May 2002
Posts: 2,107
Likes: 2
From: louisville,ky
Default

Originally Posted by Snyper
So what are my other options..how do people usually run them?
If you are going to run them in a single turbo application you need to put one in each bank pre-turbo. If you are running twins you can put them in the downpipes post turbo. In a single app. I either dont use factory sensors and tune in open loop, or dont expect them to last long.
Reply
Old Feb 9, 2010 | 12:57 PM
  #15  
Snyper's Avatar
Thread Starter
10 Second Club
iTrader: (27)
 
Joined: Nov 2006
Posts: 1,905
Likes: 0
From: Connecticut
Default

Originally Posted by black98ws6ta
If you are going to run them in a single turbo application you need to put one in each bank pre-turbo. If you are running twins you can put them in the downpipes post turbo. In a single app. I either dont use factory sensors and tune in open loop, or dont expect them to last long.
I have emissions to deal with unfort. Maybe I can get 2 tunes. One with for emissions and one without for normal driving and just install them when I go to get tested.
Reply
Old Feb 9, 2010 | 02:16 PM
  #16  
XtremeDime's Avatar
TECH Addict
iTrader: (16)
 
Joined: Jul 2005
Posts: 2,899
Likes: 0
From: Anchorage, ALASKA
Default

Wait, you can pass IM with an LSX-swapped and turboed 350z? What the hell? I cant even pass with the stock motor turboed. You east coast guys are lucky lol
Reply
Old Feb 9, 2010 | 02:46 PM
  #17  
Snyper's Avatar
Thread Starter
10 Second Club
iTrader: (27)
 
Joined: Nov 2006
Posts: 1,905
Likes: 0
From: Connecticut
Default

Its not as easy as it sounds. As long as my ecu isnt throwing any codes or a bunch of "not readys" im set.
Reply
Old Feb 9, 2010 | 05:46 PM
  #18  
XtremeDime's Avatar
TECH Addict
iTrader: (16)
 
Joined: Jul 2005
Posts: 2,899
Likes: 0
From: Anchorage, ALASKA
Default

Still man, I dont have a prayer lol
Reply
Old Feb 9, 2010 | 06:23 PM
  #19  
kbracing96's Avatar
TECH Senior Member
iTrader: (25)
 
Joined: Jul 2004
Posts: 8,929
Likes: 2
From: Sutherlin OR
Default

Narrow band O2 are fine pre-turbo, they take heat much better then WB o2's. And there not used in WOT anyway so accuracy is not important there. Mine have been pre-turbo for 4 years and still work great!
Reply
Old Feb 9, 2010 | 09:08 PM
  #20  
AaronSRT8's Avatar
Teching In
 
Joined: Feb 2010
Posts: 28
Likes: 0
Default

I guess you can try the narrowband pre turbo, but I've always heard it's a bad idea. No first hand experience though. My WB told me if it's on a turbo app, it needs to be at least 12" past the turbine on the downpipe. I put it about 24" past, and no problems.
Reply



All times are GMT -5. The time now is 08:39 PM.

story-0
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-1
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-2
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-3
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-4
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-5
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE
story-6
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE
story-7
Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Slideshow: A heavily reworked 1972 K5 Blazer swaps its off-road roots for a low-slung street-focused build with modern V8 power.

By Verdad Gallardo | 2026-03-09 18:08:45


VIEW MORE
story-8
10 Camaros You Should Never Buy

Slideshow: There are thousands of used Camaros on the market but we think you should avoid these 10

By | 2026-02-17 17:09:30


VIEW MORE
story-9
10 LS Engine Myths That Refuse to Die

Slideshows: Which one of these myths do you believe?

By Verdad Gallardo | 2026-01-28 18:10:11


VIEW MORE