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Old 02-20-2012, 04:38 PM   Thread Starter #1
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Default Gutted Stock Precats

Ok so im getting another set of oem headers n pre cats n gutting them for my turbo applacation. upon installing them will i throw codes with them
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Old 02-21-2012, 01:57 AM   #2
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Default Re: Gutted stock precats

Yes you will definately throw o2 codes. The codes wll be for catalitic inefficiency. This means that the rear o2 sensors will trigger. The rear oxygen readings will be way too high...probably staying anywhere in the 0.5-1.0V once you ECM goes into closed loop.

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Old 02-21-2012, 01:40 PM   #3
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Default Re: Gutted stock precats

Mess with the pre-cats seems we always get codes. Did you pull them? Which codes did you get?
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Old 02-23-2012, 03:34 PM   Thread Starter #4
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Default Re: Gutted stock precats

nah not yet, im in the process of doing this
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Old 02-23-2012, 04:09 PM   #5
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Default Re: Gutted Stock Precats

Oh yeah, I think you will get codes.
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Old 02-23-2012, 04:40 PM   #6
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Default Re: Gutted Stock Precats

Yes, you will definetly get codes no questions asked. lol
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Old 02-23-2012, 04:43 PM   Thread Starter #7
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Default Re: Gutted Stock Precats

so just o2 similators or 350z o2 sensors and ill be in the clear right?
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Old 02-23-2012, 04:53 PM   #8
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Default Re: Gutted Stock Precats

More time efficient to get the ebay headers. Either way you will need an 02 sim or some of the other options used to prevent the CEL.
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Old 02-23-2012, 05:02 PM   #9
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Default Re: Gutted Stock Precats

Originally Posted by Maximusberg View Post
so just o2 similators or 350z o2 sensors and ill be in the clear right?
350z sensors will do nothing for you but provide extended connector. o2 sims are probably a better way to eliminate the CEL, however doing so raises 2 more questions I have for you.....

1. How strict are emission laws in your state?
2. What is your plan with tunning. Since, from your build post you are going to run Forced Induction, your rear 02 simulators(since they are just simulators, they dont rely on the data from the actual o2 sensor) might trigger telling the Computer that you are pig "RICH" the ECM will turn around and pull fuel/time....Lean is not something you ever want to do when you are running Forced....If you are doing your own tuning you have to compensate for that greatly or whoever is tuning for you will have to.

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Old 02-23-2012, 05:07 PM   #10
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Default Re: Gutted Stock Precats

Originally Posted by Danski6MT View Post
350z sensors will do nothing for you but provide extended connector. o2 sims are probably a better way to eliminate the CEL, however doing so raises 2 more questions I have for you.....

1. How strict are emission laws in your state?
2. What is your plan with tunning. Since, from your build post you are going to run Forced Induction, your rear 02 simulators(since they are just simulators, they dont rely on the data from the actual o2 sensor) might trigger telling the Computer that you are pig "RICH" the ECM will turn around and pull fuel/time....Lean is not something you ever want to do when you are running Forced....If you are doing your own tuning you have to compensate for that greatly or whoever is tuning for you will have to.

-Dan
I thought the initial 6spd's used NARROWBAND sensors like the 04 4spds.
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Old 02-23-2012, 05:11 PM   #11
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Default Re: Gutted Stock Precats

Originally Posted by EddyMaxx View Post
I thought the initial 6spd's used NARROWBAND sensors like the 04 4spds.
Im unsure I understand this Eddy?

Narrow bands are rear sensors as they only look for stoich , anything below voltage wise is lean, and above is rich. Fronts are wide band, hence they are able to monitor A/F ratios..
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Old 02-23-2012, 05:27 PM   #12
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Default Re: Gutted Stock Precats

Originally Posted by Danski6MT View Post
Im unsure I understand this Eddy?

Narrow bands are rear sensors as they only look for stoich , anything below voltage wise is lean, and above is rich. Fronts are wide band, hence they are able to monitor A/F ratios..
Not all 6thgens use widebands sensors at all, particularly the 04's (4spd/6spds).

In my 04' 4spd, I have Cattman headers with no CEL codes. A buddy of mine with an 04' 6spd has headers and also no CEL. All we did was extend the main harness and that's it.

With the Narrowband sensors, depending on the voltage, the ECM will continuously +/- fuel. With the widebands you need to trick the ECU into sending the correct voltage otherwise, bad voltage = CEL.
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Old 02-23-2012, 05:30 PM   #13
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Default Re: Gutted Stock Precats

You are correct in the front wideband sensors, but that applies to the 05+ 5spd in particular.
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Old 02-23-2012, 05:34 PM   #14
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Default Re: Gutted Stock Precats

So if the front are wide band and the rears arent could that be a reason why im getting a code with my HFPC for the rear cats and not the fronts, would putting wide band in the rear might fix the problem P0420
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Old 02-23-2012, 05:37 PM   #15
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Default Re: Gutted Stock Precats

Originally Posted by EddyMaxx View Post
Not all 6thgens use widebands sensors particularly the 04's (4spd/6spds).

In my 04' 4spd, I have Cattman headers with no CEL codes. A buddy of mine with an 04' 6spd has headers and also no CEL. All we did was extend the main harness and that's it.

With the Narrowband sensors, depending on the voltage, the ECM will continuously +/- fuel. With the widebands you need to trick the ECU into sending the correct voltage other bad voltage = CEL.
All 04' come with A/F (wideband) taking a fuel/air sample into the sensor in the manifolds and rear heater oxygen sensors (narrowband) post cats.
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Old 02-23-2012, 05:41 PM   #16
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Default Re: Gutted Stock Precats

Originally Posted by Danski6MT View Post
All 04' come with A/F (wideband) taking a fuel/air sample into the sensor in the manifolds and rear heater oxygen sensors (narrowband) post cats.
No, the 04' 4spd DO NOT have primary wideband sensors.
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Old 02-23-2012, 05:42 PM   Thread Starter #17
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Default Re: Gutted Stock Precats

Originally Posted by Danski6MT View Post
350z sensors will do nothing for you but provide extended connector. o2 sims are probably a better way to eliminate the CEL, however doing so raises 2 more questions I have for you.....

1. How strict are emission laws in your state?
2. What is your plan with tunning. Since, from your build post you are going to run Forced Induction, your rear 02 simulators(since they are just simulators, they dont rely on the data from the actual o2 sensor) might trigger telling the Computer that you are pig "RICH" the ECM will turn around and pull fuel/time....Lean is not something you ever want to do when you are running Forced....If you are doing your own tuning you have to compensate for that greatly or whoever is tuning for you will have to.

-Dan
gonna be tunning with my safc2 and my wideband with my stock injectors just to have a safe drive able car to get me to the dyno place, then i will be dropping in my bigger injectors and uprev tunning my beast to make sure its safe......

the whole idea for me going forced induction for the time being is im not looking for crazy numbers since im not touch internals.. im shooting for around 350-380whp. i wanted to have a driveable turbo car, as if it came stock from the factory until i have the money to do the internals. to make this kit work we drew up a new plan becuz i wanna be safe about it, im using the stock headers and pre cats ( just gutted, and having my boy do a custom down pipe into the the custom y-pipe).... but i wanted to install the gutted ones asoon as possible so i can get that part out the way and not have to do it last minute, but i didnt wanna be driving around with the cel on.....
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Old 02-23-2012, 05:44 PM   #18
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Default Re: Gutted Stock Precats

Originally Posted by Danski6MT View Post
All 04' come with A/F (wideband) taking a fuel/air sample into the sensor in the manifolds and rear heater oxygen sensors (narrowband) post cats.
If that held true (not that I'm calling you a liar lol), then I would definelty have codes but I don't. It was really plug-n-play for me.
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Old 02-23-2012, 05:48 PM   #19
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Default Re: Gutted Stock Precats

Originally Posted by 06BlckMax View Post
So if the front are wide band and the rears arent could that be a reason why im getting a code with my HFPC for the rear cats and not the fronts, would putting wide band in the rear might fix the problem P0420
You are not supposed to be getting ANY codes with HFPC. That was like the main selling point for them.
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Old 02-23-2012, 05:50 PM   Thread Starter #20
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Default Re: Gutted Stock Precats

im thinking somehting is in his egr valve....
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Old 02-23-2012, 05:59 PM   #21
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Default Re: Gutted Stock Precats

Originally Posted by EddyMaxx View Post
If that held true (not that I'm calling you a liar lol), then I would definelty have codes but I don't. It was really plug-n-play for me.
Im not familiar with your setup Eddy, other then the 6mt swap. What is your setup
- Do you have cats
-where are you sensors placed.

Codes appear for more then one reason...It could be a lazy/stuck sensor....or more then one. The fact that you dont have codes is great...If you have no cats and no codes...well, now that would be different, you got me excited (not in a sexual way) lol and I want to see pics.....
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Old 02-23-2012, 06:01 PM   #22
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Default Re: Gutted Stock Precats

Originally Posted by 06BlckMax View Post
So if the front are wide band and the rears arent could that be a reason why im getting a code with my HFPC for the rear cats and not the fronts, would putting wide band in the rear might fix the problem P0420
NO,and NO.
The rear 3rd cat( 3 way catalyst) is not monitored... no sensors behind it...
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Old 02-23-2012, 06:02 PM   #23
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Default Re: Gutted Stock Precats

Originally Posted by Danski6MT View Post
Im not familiar with your setup Eddy, other then the 6mt swap. What is your setup
- Do you have cats
-where are you sensors placed.

Codes appear for more then one reason...It could be a lazy/stuck sensor....or more then one. The fact that you dont have codes is great...If you have no cats and no codes...well, now that would be different, you got me excited (not in a sexual way) lol and I want to see pics.....
I have NO Cats and Cattman Headers. I actually put exhaust cutout on my y-pipe and eliminated the CAT completely.
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6thgen 2014 Build Thread
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Old 02-23-2012, 06:04 PM   #24
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Default Re: Gutted Stock Precats

Originally Posted by Danski6MT View Post
NO,and NO.
The rear 3rd cat( 3 way catalyst) is not monitored... no sensors behind it...
Huh I only have the HFPC I have the RL y-pipe no cat
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Old 02-23-2012, 06:48 PM   #25
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Default Re: Gutted Stock Precats

Originally Posted by Maximusberg View Post
gonna be tunning with my safc2 and my wideband with my stock injectors just to have a safe drive able car to get me to the dyno place, then i will be dropping in my bigger injectors and uprev tunning my beast to make sure its safe......

the whole idea for me going forced induction for the time being is im not looking for crazy numbers since im not touch internals.. im shooting for around 350-380whp. i wanted to have a driveable turbo car, as if it came stock from the factory until i have the money to do the internals. to make this kit work we drew up a new plan becuz i wanna be safe about it, im using the stock headers and pre cats ( just gutted, and having my boy do a custom down pipe into the the custom y-pipe).... but i wanted to install the gutted ones asoon as possible so i can get that part out the way and not have to do it last minute, but i didnt wanna be driving around with the cel on.....
Why would you not go true headers instead of gutted pre-cats?
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