Cat converter option

[WildHorse]

He is saying the widebands are reporting wrong info to the ECU.

I highly doubt it.

Narrow band by it's very nature only measures stoich. So what happens when the engine is running an air to fuel ratio that the narrowband sensor can’t measure? Literally nothing. The sensor simply sends the ECU its signal and tells it that the engine has gone out of measurable range. If the ratio is not within the Closed Loop O2 operating parameters it just waits until it comes back into that range again.

Sponsored

 

[Robottrainer]

The easiest way is to get a gen1 driver side header. They have a flange. Then all you need to do is have a shop cut off the flange on the MAK pipe and re-clock it for the new manifold.

Welding the flange to the original header really needs to be done off the car by a real welding shop. Stainless will eventually crack if not welded properly.

I have a guy that will tig it with stainless filler. It's not to tough to weld it inside the flange

The easiest way is to get a gen1 driver side header. They have a flange. Then all you need to do is have a shop cut off the flange on the MAK pipe and re-clock it for the new manifold.

Welding the flange to the original header really needs to be done off the car by a real welding shop. Stainless will eventually crack if not welded properly.

I looked at Tasca Ford. All of the years show the cat welded to the header. And they are 900 dollars. I have a guy that can tig the flange on the car with stainless Filler wire.

 

[K4fxd]

I looked at Tasca Ford.

https://www.tascaparts.com/v-2013-ford-mustang--gt--5-0l-v8-gas/exhaust--exhaust-manifold

You need to make the cut portion of the manifold round or you need an excessive amount of filler.

 

[WildHorse]

That's for a 2013.

 

[Robottrainer]

https://www.tascaparts.com/v-2013-ford-mustang--gt--5-0l-v8-gas/exhaust--exhaust-manifold

You need to make the cut portion of the manifold round or you need an excessive amount of filler.

Yes, you have to heat it up and bang it up against flange. I was looking at the 2015 S550. I thought the gen 2s came out in 2016. How does the S197 header fit the S550 body. This is a reasonable solution if it fits. Anyone try this?

 

[engineermike]

I highly doubt it.

Narrow band by it's very nature only measures stoich. So what happens when the engine is running an air to fuel ratio that the narrowband sensor can’t measure? Literally nothing. The sensor simply sends the ECU its signal and tells it that the engine has gone out of measurable range. If the ratio is not within the Closed Loop O2 operating parameters it just waits until it comes back into that range again.

Ford’s patent on FAOSC seems to indicate the offset is applied in a matrix as a function of torque and speed, not lambda. And my own logging agrees that the offset is applied even at lambdas other than 1.0.

 

[engineermike]

@Robottrainer @K4fxd i welded a 3” chinazon flange to a cutoff stock header on the drivers side. It did require some additional filler but it wasn’t too bad. The hardest part is fitting the right angle.

The gen1 bank2 header has a flange but the 2-bolts are clocked 90 deg out from the gt500 flange. It might be an option to weld two 2-bolt flanges directly together clocked 90 deg, as an adapter, though. I did something similar to this to install gt500 cats in my truck.

 

[K4fxd]

I just cut the MAK pipe and re welded it so the flange matched up

 

[WildHorse]

Ford’s patent on FAOSC seems to indicate the offset is applied in a matrix as a function of torque and speed, not lambda. And my own logging agrees that the offset is applied even at lambdas other than 1.0.

Then why no wrench getting thrown ? Obviously FORD wasn't to concerned as they knew what enthusiasts tend to do with cats.

 

[Robottrainer]

@Robottrainer @K4fxd i welded a 3” chinazon flange to a cutoff stock header on the drivers side. It did require some additional filler but it wasn’t too bad. The hardest part is fitting the right angle.

The gen1 bank2 header has a flange but the 2-bolts are clocked 90 deg out from the gt500 flange. It might be an option to weld two 2-bolt flanges directly together clocked 90 deg, as an adapter, though. I did something similar to this to install gt500 cats in my truck.

If that header fits the s550, you could do as @K4fxd said and cut the flange off of the GENSI or GT500 cat and re clock it, weld it back on. For 200 dollars that's not a bad idea. It's sounds like @K4fxd has done this on an S550. Is this correct?

 

[engineermike]

Then why no wrench getting thrown ? Obviously FORD wasn't to concerned as they knew what enthusiasts tend to do with cats.

What situation are you talking about, specifically?

I can assure you the logic exists to determine if the cats work and it will throw a code if they don’t. My truck just reinforced this to me over the last month, which is why it has gt500 cats now.

 

[engineermike]

If that header fits the s550, you could do as @K4fxd said and cut the flange off of the GENSI or GT500 cat and re clock it, weld it back on. For 200 dollars that's not a bad idea. It's sounds like @K4fxd has done this on an S550. Is this correct?

I’ve already added a flange to a stock gen3 header (and one for my buddy). I can swap gt500 cats and home-made deletes with just 4 bolts.

 

[WildHorse]

What situation are you talking about, specifically?

I can assure you the logic exists to determine if the cats work and it will throw a code if they don’t. My truck just reinforced this to me over the last month, which is why it has gt500 cats now.

Rear o2 /meow delete. Yeah it'll throw a 420/430 but no wrench.
IF it was detrimental, it'd throw a wrench and put it into power reduction mode.

Now you say that it burns richer / leaner, can't remember which.
I seen no change in MPG , plugs look great, and I ain't crying when I fire up my car in the garage with meow deletes.

Not saying yer BS'ing... cause you ain't.

 

[engineermike]

Rear o2 /meow delete. Yeah it'll throw a 420/430 but no wrench.
IF it was detrimental, it'd throw a wrench and put it into power reduction mode.

When my 2018 car and 2020 truck throw a p420/30 it definitely turns on a wrench light. Not sure why yours doesn’t. There is not a power cut on mine as well. Ford has a concept called FMEM, failure modes and effects management. FMEM response is different depending on what the sensed failure is. For instance, if the imrc is determine to not act right, all it does is set a code and disable knock advance. The response matches the potential risk. There are multiple layers of protection against knock so if they are confident knock won’t hurt the engine, then it makes sense they still allow full power even if a 420/30 is set,

 

[Robottrainer]

I’ve already added a flange to a stock gen3 header (and one for my buddy). I can swap gt500 cats and home-made deletes with just 4 bolts.

But can any one confirm the bank 2 header from an s197 fits the s550? That's another good option if it does

Sponsored