LT Headers...O2 Sensors/O2 Sims???
Thread Starter
Team Owner
Joined: Dec 2000
Posts: 58,783
Likes: 1
From: D*ck ina Box
CI III & IV Vote Ho
CI II, III, IV & V Vet
CI IV Bracket Champ
St. Jude Donor '03-'04
LT Headers...O2 Sensors/O2 Sims???
What's the scoop....if you're running LTs do you have to run sims in the back, can you run the actual sensors???
Someone fill me in, I'm getting header jitters :eek: :D
Someone fill me in, I'm getting header jitters :eek: :D
Le Mans Master
Joined: Jun 1999
Posts: 5,237
Likes: 1
From: Newport Michigan
CF Pit Crew
Cruise-In I Veteran
Cruise-In II Veteran
Almost CI III Veteran
Cruise-In IV Veteran
Re: LT Headers...O2 Sensors/O2 Sims??? (Mean Green 2000)
The sims are only needed if you ditch the cats. The headers will have provisions for mounting the front sensors, the rear sensors will stay put if you are keeping your cats.
Thread Starter
Team Owner
Joined: Dec 2000
Posts: 58,783
Likes: 1
From: D*ck ina Box
CI III & IV Vote Ho
CI II, III, IV & V Vet
CI IV Bracket Champ
St. Jude Donor '03-'04
Re: LT Headers...O2 Sensors/O2 Sims??? (70L46)
:cool: that explains it somewhat :D :cheers:
for the set I'm getting the stock cats get ditched but I am running hi-flow cats, so I assume there could be a provision, if so built, that accomodate the stock rear sensors, correct :)
for the set I'm getting the stock cats get ditched but I am running hi-flow cats, so I assume there could be a provision, if so built, that accomodate the stock rear sensors, correct :)
Le Mans Master
Joined: Jun 1999
Posts: 5,237
Likes: 1
From: Newport Michigan
CF Pit Crew
Cruise-In I Veteran
Cruise-In II Veteran
Almost CI III Veteran
Cruise-In IV Veteran
Re: LT Headers...O2 Sensors/O2 Sims??? (Mean Green 2000)
Yep, worst case you would need to get a couple of bungs welded into the pipes behind the cats to mount the sensors.
LT's high flow cats and Borlas - got your ear-plugs ordered :lol:
LT's high flow cats and Borlas - got your ear-plugs ordered :lol:
Thread Starter
Team Owner
Joined: Dec 2000
Posts: 58,783
Likes: 1
From: D*ck ina Box
CI III & IV Vote Ho
CI II, III, IV & V Vet
CI IV Bracket Champ
St. Jude Donor '03-'04
Re: LT Headers...O2 Sensors/O2 Sims??? (70L46)
that's what I thought :D....thanks :D
:reddevil
LT's high flow cats and Borlas - got your ear-plugs ordered :lol:
Intermediate
Joined: Jan 2003
Posts: 33
Likes: 0
From: Rockford Illinois
Re: LT Headers...O2 Sensors/O2 Sims??? (Mean Green 2000)
If you have HighFlow cats, there is a chance that you will set an O2 code. I had it happen on a friends camaro with MAC headers/cats. Get the simms and not worry. :cheers:
Thread Starter
Team Owner
Joined: Dec 2000
Posts: 58,783
Likes: 1
From: D*ck ina Box
CI III & IV Vote Ho
CI II, III, IV & V Vet
CI IV Bracket Champ
St. Jude Donor '03-'04
Re: LT Headers...O2 Sensors/O2 Sims??? (Wicked Zoh6)
I guess my underlying question is why would they set codes, with proper tuning....why are the sims necessary with a setup like this, :) :cheers:
Le Mans Master
Joined: Jun 1999
Posts: 5,237
Likes: 1
From: Newport Michigan
CF Pit Crew
Cruise-In I Veteran
Cruise-In II Veteran
Almost CI III Veteran
Cruise-In IV Veteran
Re: LT Headers...O2 Sensors/O2 Sims??? (Mean Green 2000)
The rear sensors monitor the function of the cats by essentially monitoring their oxygen storage capacity. Since the PCM calibration is done for the characteristics of the stock cats, I could see where a different cat might throw a code. You should also be able to disable the rear sensors with LS1 Edit and not need the sims.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Thread Starter
Team Owner
Joined: Dec 2000
Posts: 58,783
Likes: 1
From: D*ck ina Box
CI III & IV Vote Ho
CI II, III, IV & V Vet
CI IV Bracket Champ
St. Jude Donor '03-'04
Re: LT Headers...O2 Sensors/O2 Sims??? (70L46)
wouldn't proper tuning utilizing the stock rear sensors also reduce throwing codes....just talking out loud :)
and thanks for the help, I really wanna do these headers once and the right way the 1st time :D
and thanks for the help, I really wanna do these headers once and the right way the 1st time :D
Thread Starter
Team Owner
Joined: Dec 2000
Posts: 58,783
Likes: 1
From: D*ck ina Box
CI III & IV Vote Ho
CI II, III, IV & V Vet
CI IV Bracket Champ
St. Jude Donor '03-'04
Re: LT Headers...O2 Sensors/O2 Sims??? (Wicked Zoh6)
Maybe High Flow cats flow too much :confused: Got me! All I know is that we put simms in and it was solved! :hurray:
Burning Brakes
Joined: Oct 2001
Posts: 834
Likes: 0
From: Grayson Ga.
Re: LT Headers...O2 Sensors/O2 Sims??? (Mean Green 2000)
Mean, you only use one set of O2 sensors on the LGM's.
The collector is sooooo far back that you need to move the rear sensors forward and run sims in the rear.
The collector is sooooo far back that you need to move the rear sensors forward and run sims in the rear.
Safety Car
Joined: Dec 2000
Posts: 3,888
Likes: 0
From: Humble, Tx
Re: LT Headers...O2 Sensors/O2 Sims??? (Mean Green 2000)
I just installed the FLP's with the High flow cats. I haven't thrown any codes as of yet (about 1000 miles on them). According to MTI the rear O2 sensors only function is as mentioned above, and that is to monitor the performance of the cats....and that's it. Here in Texas the inspections are done via OBDII, looking for any emmisions problems. If the rear O2's are programmed out via LS1 edit then the PCM will fail inspection. Install the O2 simms and it will pass. I'm not sure what your requirements are in Tampa, but this is how it is here.
Thread Starter
Team Owner
Joined: Dec 2000
Posts: 58,783
Likes: 1
From: D*ck ina Box
CI III & IV Vote Ho
CI II, III, IV & V Vet
CI IV Bracket Champ
St. Jude Donor '03-'04
Re: LT Headers...O2 Sensors/O2 Sims??? (Wt99C5)
no inspections currently but who knows when that could change and I really wanted to tone 'em down a little and not worry about the exhaust so smell, so I added the cats :)
I assume you mean you use the whole wire setup and hook 'em up to the front sensor input, otherwise the rears, which as stated will minitor the post cat pipes, will be monitoring and reporting the wrong values.
And isn't there anyone who can supply longer wires if that's all it takes to run rear sensors?....the wires for the sims have to be that long to work so why couldn't the sensors :) :cheers:
Mean, you only use one set of O2 sensors on the LGM's.
The collector is sooooo far back that you need to move the rear sensors forward and run sims in the rear.
The collector is sooooo far back that you need to move the rear sensors forward and run sims in the rear.
And isn't there anyone who can supply longer wires if that's all it takes to run rear sensors?....the wires for the sims have to be that long to work so why couldn't the sensors :) :cheers:
Race Director
Joined: Oct 2002
Posts: 16,477
Likes: 26
From: Gone
CI 6-7-8-9-10 Veteran
St. Jude Donor '03
Re: LT Headers...O2 Sensors/O2 Sims??? (Mean Green 2000)
And isn't there anyone who can supply longer wires if that's all it takes to run rear sensors?....the wires for the sims have to be that long to work so why couldn't the sensors :) :cheers:
I have the sims, and one of them I think is NFG, as I constantly throw a rr 02 fault. I have the FLP's with the cats...I haven't been able to get the car on the lift since the install, I'm hoping I can just remove the sims and reconnect my rear 02 sensorss. The sims seem largely unreliable, as I've read tons of stories just like mine.
:cheers:
Burning Brakes
Joined: Oct 2001
Posts: 834
Likes: 0
From: Grayson Ga.
Re: LT Headers...O2 Sensors/O2 Sims??? (Mean Green 2000)
Actually there is only 1 bung per side. you will install what was the rear O2 sensors in the collector, which will be connected to the front O2 wiring harness. The wires that went to the rear O2's will be connected to the sims.
[Modified by Wt99C5, 1:49 AM 3/25/2003]
[Modified by Wt99C5, 1:49 AM 3/25/2003]
Thread Starter
Team Owner
Joined: Dec 2000
Posts: 58,783
Likes: 1
From: D*ck ina Box
CI III & IV Vote Ho
CI II, III, IV & V Vet
CI IV Bracket Champ
St. Jude Donor '03-'04
Re: LT Headers...O2 Sensors/O2 Sims??? (Y2Kvert4me)
The sims just plug into the wiring harness to trick the computer, they aren't physically connected to the exhaust, so no, they don't have to be long enough.
I'm hoping I can just remove the sims and reconnect my rear 02 sensorss. The sims seem largely unreliable, as I've read tons of stories just like mine.
:cheers:
:cheers:
Team Owner
Joined: Dec 1999
Posts: 174,312
Likes: 1,217
From: Here
Pilot of Beer Force 1
Tampa Regional Coordinator
CI 4-5-6-7-8 Veteran
Organizer St. Jude Fundraiser
I believe in the Beer Fairy
Re: LT Headers...O2 Sensors/O2 Sims??? (Mean Green 2000)
Just used the sensors on my TPIS...no problems :D
Melting Slicks
Joined: May 2001
Posts: 2,596
Likes: 120
From: East Tennessee
Re: LT Headers...O2 Sensors/O2 Sims??? (Mean Green 2000)
I'm not sure what headers you are planning on using but the FLPs have the rear bungs after the cats and use the stock sensors just fine.
If you are planning on not using cats or if you have FLPs and you swap the cats off to race, simms or LS1 edit is a must. If you are running cats the rear O2s should work just fine. The reason some headers will still throw codes with cats is the cats are usually way further back then the stock cats and they just dont work as well as the stock setup. The only thing the rear O2s do is tell the PCM how well the cats are working :)
BTW, I run cats all he time and the rear O2s - never a problem..
[Modified by kp, 9:36 PM 3/24/2003]
If you are planning on not using cats or if you have FLPs and you swap the cats off to race, simms or LS1 edit is a must. If you are running cats the rear O2s should work just fine. The reason some headers will still throw codes with cats is the cats are usually way further back then the stock cats and they just dont work as well as the stock setup. The only thing the rear O2s do is tell the PCM how well the cats are working :)
BTW, I run cats all he time and the rear O2s - never a problem..
[Modified by kp, 9:36 PM 3/24/2003]
Thread Starter
Team Owner
Joined: Dec 2000
Posts: 58,783
Likes: 1
From: D*ck ina Box
CI III & IV Vote Ho
CI II, III, IV & V Vet
CI IV Bracket Champ
St. Jude Donor '03-'04
Re: LT Headers...O2 Sensors/O2 Sims??? (kp)
startin' to clear that muddy water :)...thanks kp :cheers: