Kooks Long Tube Headers

[Junkyard Dog]

https://www.americanmuscle.com/mustang-faq-oxygen-sensors.html

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[Junkyard Dog]

Don't know how reliable this is, but I thought I would put it here for consideration

 

[Kevi]

The O2 sensor sends a signal to the computer that it uses to determine how much fuel to put into the cylinders . . .
or do I seriously misunderstand how the engine works?

How does running this part affect the air fuel ratio determination?

I believe the upstream o2 sensor above the cat is used for computer calculations and adjustment. The downstream sensor just detects a failed catalyst so it's easy to spoof.

 

[Gsi30]

Didn't they used to sell dummy o2 sensors that would always report good on the computer even if the cats were removed?

What is the sensor called. I have kooks long tube headers with high flow green cats on my s650 When I accelerate hard I get a cel. I can reset the code and drive in town just fine but when I get chance to get on the car, the code comes back.

 

[Kevi]

What is the sensor called. I have kooks long tube headers with high flow green cats on my s650 When I accelerate hard I get a cel. I can reset the code and drive in town just fine but when I get chance to get on the car, the code comes back.

They are just called o2 simulators or dummy o2 sensors. I haven't really looked for them since the early 2000s. Not sure if they are still a thing with all the new federal emissions laws.

 

[Junkyard Dog]

I believe the upstream o2 sensor above the cat is used for computer calculations and adjustment. The downstream sensor just detects a failed catalyst so it's easy to spoof.

You're right.

I have read differently online from others talking to competent tuners and posting what they were told. I have no firsthand knowledge myself.

But from post #47's link:

The PCM also uses the downstream O2 sensors to check and recalibrate the upstream O2 sensor, combatting sensor drift.

I will keep looking into this.

 

[Junkyard Dog]

What is the sensor called. I have kooks long tube headers with high flow green cats on my s650 When I accelerate hard I get a cel. I can reset the code and drive in town just fine but when I get chance to get on the car, the code comes back.

Thank you. This is very useful information.

 

[Q6543]

Just go to autozone and buy the long defoulers… people making this way too hard on themselves… it’s at the store.

 

[hattedchimp]

Has anyone installed the headers onto to the non-active stock exhaust? I was thinking of not swapping the catback but just adding catted headers for sound/airflow, but I'm not sure if the fitment is good. or if a different catback is needed.

 

[Junkyard Dog]

Just go to autozone and buy the long defoulers… people making this way too hard on themselves… it’s at the store.

Do the long defoulers affect the performance of the sensors in combatting sensor drift, as mentioned above in post 53?

 

[Q6543]

Do the long defoulers affect the performance of the sensors in combatting sensor drift, as mentioned above in post 53?

people making this way too hard on themselves…

Idk … I run a single bank sensor on a non IC’d E85 meth injected fox… tuned to an inch of its life… maybe on my other car I’d pay attention to sensor drift over time

on a 2025 with 4 sensors, infinitely better processing and real time adjustments …. I don’t have time to care about that level of trivial drift

 

[Junkyard Dog]

on a 2025 with 4 sensors, infinitely better processing and real time adjustments …. I don’t have time to care about that level of trivial drift

Hopefully Lund or somebody competent will be in the tuning business for the S650 at some point.

That infinitely better processing probably leaves room for some excellent results.

 

[Q6543]

Whipple has it tuned better than my Lund tune was or my AED tune from previous mustangs

maybe N/A they could get some gains for folks, but boosted I don’t think so
Also I’m really disappointed that those tuning companies didn’t get onboard with the 24s and innovate something

I bet YOY revenue is being crushed pretty hard.

 

[drive_55_not]

Do the long defoulers affect the performance of the sensors in combatting sensor drift, as mentioned above in post 53?

As long as the rear O2's are installed and not throwing a code, the PCM will presume the system is operating normally .

I think people are confused as to what FAOSC does, The PCM monitors the rear O2 and all it's looking for is XX amount of oxygen post cat's.

If the PCM see's too much or too little O2 , it'll adjust the lambda to bring it in tolerance.

And if it can't it'll throw P2096/P2097 or P0420/P0430 code.




.

 

[Junkyard Dog]

FAOSC?

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