CAT DELETE Need a tune?

[K4fxd]

No tune needed. Period.

I've been doing a lot more studying and am now inclined to believe WH on this. It seems when widebands age they get slower in response. They don't go out of range or calibration unless damaged.

Ford uses a wire for open air calibration. This is why we cannot cut and splice in wire to make them longer. Need F150 O2's or an adapter harness.

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[JakeLethal]

I am getting a cat delete on my 2018 gt. I am getting 2m performance delete pipes in place of the cats.

The performance shop insists that the computer will adjust to the missing cat and difference in airflow and I do not need a tune. I asked him 'wont it run rich?' and they told me the computer will adjust. What do you guys think? Will i do any damage to the engine if I don't get a tune after deleting the cats? I know a CEL will pop up but will it cause any long term damage or will the computer actually adjust like the shop is telling me?

Yep, that's correct. Factory wideband 02, the computer will re-adjust accordingly. The biggest thing will be the CEL but won't damage anything to my knowledge. Just a annoying light to look at.

 

[Robottrainer]

An

I've been doing a lot more studying and am now inclined to believe WH on this. It seems when widebands age they get slower in response. They don't go out of range or calibration unless damaged.

Ford uses a wire for open air calibration. This is why we cannot cut and splice in wire to make them longer. Need F150 O2's or an adapter harness.

And without the rear 02 adjusting for the reduced front 02 performance, you should change the front 02s every few years.

 

[K4fxd]

And without the rear 02 adjusting for the reduced front 02 performance, you should change the front 02s every few years.

I'm still looking at patents and listening to people smarter than me.

Even without the rears turned on we should get a normal service life out of the wide bands. When they wear out they slow down, they do not drift.

Still looking at what effect leaving them on does, since most if not all tuners will not turn them off. I believe it is whithin the margin of error and has no effect.

 

[Robottrainer]

I'm still looking at patents and listening to people smarter than me.

Even without the rears turned on we should get a normal service life out of the wide bands. When they wear out they slow down, they do not drift.

Still looking at what effect leaving them on does, since most if not all tuners will not turn them off. I believe it is whithin the margin of error and has no effect.

I'm at this junction in the road. I'm doing the same 2M Fabricators pipes except adding GENSI Gen 2 Ultras catalytic converters.

I like the minimal odor set up. I also plan to leave the rears turned on as they help protect the cats.

I did the same with kooks long tubes and green cats on my previous 2013 GT500. I ran it with the rear O2s on and never found any problems.

I'm still looking at patents and listening to people smarter than me.

Even without the rears turned on we should get a normal service life out of the wide bands. When they wear out they slow down, they do not drift.

Still looking at what effect leaving them on does, since most if not all tuners will not turn them off. I believe it is whithin the margin of error and has no effect.

But it still makes you wonder...if the cat is a 400 cpi instead of 800....if the rear sensor is further back...does it screw up the offset to the front O2s? If so, then it would make sense to turn off the rear sensors?

 

[WildHorse]

am now inclined to believe WH on this

And without the rear 02 adjusting for the reduced front 02 performance

it BARELY adjusts it @ stoich , like, .5% (point five %) according to Ford.
At that's mostly for the cats. No cats, no problem.

So in the event your fronts go say an very unlikely 20% out,
the rears won't compensate for sh!t.

Replacement intervals:
Walker / NKG recommends every 60K miles.
Others 100K
Ford doesn't specify.
Obviously, if your running E85, much sooner
Leaded octane boosters aren't to friendly to the o2's,
regular users should replace once a year.

 

[Robottrainer]

it BARELY adjusts it @ stoich , like, .5% (point five %) according to Ford.
At that's mostly for the cats. No cats, no problem.

So in the event your fronts go say an very unlikely 20% out,
the rears won't compensate for sh!t.

Replacement intervals:
Walker / NKG recommends every 60K miles.
Others 100K
Ford doesn't specify.
Obviously, if your running E85, much sooner
Leaded octane boosters aren't to friendly to the o2's,
regular users should replace once a year.

Sounds like a whole lot of feathers and not much chicken.

 

[WildHorse]

Sounds like a whole lot of feathers and not much chicken.

Huh ?

 

[Robottrainer]

Huh ?

It seems like there is a lot there for only a 5% correction. Do the 02s actually drift or do they just slow in response?

 

[WildHorse]

It seems like there is a lot there for only a 5% correction. Do the 02s actually drift or do they just slow in response?

point five percent. like 1/2 percent. thought that was clear.
it doesn't drift.

 

[Robottrainer]

point five percent. like 1/2 percent. thought that was clear.
it doesn't drift.

Sorry, I missed the decimal point on the phone screen. thats even more negligible. Yes it doesnt drift. the response slows.

 

[Robottrainer]

I've been doing a lot more studying and am now inclined to believe WH on this. It seems when widebands age they get slower in response. They don't go out of range or calibration unless damaged.

Ford uses a wire for open air calibration. This is why we cannot cut and splice in wire to make them longer. Need F150 O2's or an adapter harness.

I asked that very question in another thread. Can you use the rear sensors from the F150 in the Mustang and do they have longer leads?

 

[K4fxd]

The rears are narrow band and should interchange with the F150. I haven't done it, so I don't know if the wires are longer or not.

 

[HKusp]

I have the F150 rears. They ARE longer and they work. I am catless with defoulers now. No CEL for the lack of cats.

 

[Dave2013M3]

it BARELY adjusts it @ stoich , like, .5% (point five %) according to Ford.
At that's mostly for the cats. No cats, no problem.

So in the event your fronts go say an very unlikely 20% out,
the rears won't compensate for sh!t.

Replacement intervals:
Walker / NKG recommends every 60K miles.
Others 100K
Ford doesn't specify.
Obviously, if your running E85, much sooner
Leaded octane boosters aren't to friendly to the o2's,
regular users should replace once a year.

Those intervals for E85 is that a full E85 not like an E25-E30? Thanks

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