High Flow Cats

[ahl395]

I’ve been curious how other makes/models that come from the factory with either turbo or supercharger are doing it. What are they doing different?

While I'm not sure about the cat itself, alot of it is in the ECU/tune. It's called "Cat overtemp protection".

Once the cats reach a certain temp the ECU commands additional fuel to be injected to cool the cats down. However you lose power when this happens which is why most aftermarket tunes have it disabled.

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[Eritas]

Like I said, my main basis for my post was based on what a Mustang shop told me. You are correct it's 800hp, I thought it was 600. However where does it say 800hp per cat?

After reading your link I just remembered the main issue I had with them.They advertise "exhaust gas temp up to 1500F" like it's something special. 1500F is nothing, I can hit that at 50% throttle lol. Heat is what kills the cat. Stock cats I saw exhaust gas temps up to 2300F. I still get 1800F now that I'm catless.

I'm not saying the Green cats are bad, they're definitely better than any other cat on the market. Just that on a boosted car they're not as bulletproof as they lead you to believe. There's plenty of people running FI on factory cats without issue too, for now.

That's what my friend said Kooks told them after he bought his. I guess there's a turbo Honda making over 600whp on a single green cat. Maybe he just has a good tune but he's at the strip a couple times a month for over the last 3 years at 800whp without issues so I guess they're working for him alright. :shrug:

 

[Bartly]

While I'm not sure about the cat itself, alot of it is in the ECU/tune. It's called "Cat overtemp protection".

Once the cats reach a certain temp the ECU commands additional fuel to be injected to cool the cats down. However you lose power when this happens which is why most aftermarket tunes have it disabled.

Now you are jogging my memory. Last year when installing my kit with the supplied Procharger tune my initial logs showed my cat temps getting up around 1950F. Procharger sent me a tune revision which (if I recall correctly) had “fuel enrichment” turned on and that lowers the cat temps to mid 1600s. So you are right about aftermarket tunes not having the protection turned on. This was weird in my case because I even told PC that I had my factory cats when requesting the original tune.

 

[Logan@Lethal]

If you're able to catless, it sure is easier! lol

 

[SolarFlare]

I trust cats on a boosted car less than I trust Hillary.

 

[cobra99dave]

Mine looked similar, maybe a bit worse on my car after only a couple thousand miles with the blower on. They were Stainless Works. I called them and they said their cats are good until about 650 rwhp, Im making around 800. So no cats it is for me now.

 

[ahl395]

That's what my friend said Kooks told them after he bought his. I guess there's a turbo Honda making over 600whp on a single green cat. Maybe he just has a good tune but he's at the strip a couple times a month for over the last 3 years at 800whp without issues so I guess they're working for him alright. :shrug:

Oh alright, good to know. I didn't realize that. The HP level is a non-issue then for most.

Now you are jogging my memory. Last year when installing my kit with the supplied Procharger tune my initial logs showed my cat temps getting up around 1950F. Procharger sent me a tune revision which (if I recall correctly) had “fuel enrichment” turned on and that lowers the cat temps to mid 1600s. So you are right about aftermarket tunes not having the protection turned on. This was weird in my case because I even told PC that I had my factory cats when requesting the original tune.

Yep!

I believe it's usually turned off even if the tuner knows you have cats because of power loss once it kicks in. I know Lund turns it off standard as well. The cat will probably still last awhile without the protection mode, but less than with it. it's only a matter of time either way though IMO.

 

[Joe 5.0]

Damn! I have SW catted headers, and if I remember correctly, my cats looked the same. I'm still N/A, so I shouldn't have this problem lmao.

 

[S550GTCS]

I have SW catted headers as well, guess I will check mine this weekend to see if mine are the same.

 

[Kahboom]

GESI makes high flow cats that support 850hp and 49 state legal, but they are 450 a cat. If you can get away with not using them it's cheaper.

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