Kooks green cats

[JoeCee]

If you want to prioritize cat longevity over performance I think I’d run stock cats with 8 psi or less, 19-20 deg timing, and super rich at wot like .72-.73. Have cot drop it to around .68 if it will do it without misfires.

TY! Much appreciated!

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[Joshinator99]

If you want to prioritize cat longevity over performance I think I’d run stock cats with 8 psi or less, 19-20 deg timing, and super rich at wot like .72-.73. Have cot drop it to around .68 if it will do it without misfires.

That’s too rich for a DI motor in my humble opinion. I’ve found .82 to be very safe for DI engines and of course you richen a bit more under COT. Guys who shut COT off usually have the biggest cat melting issues (obviously lol).

 

[engineermike]

The idea of running it at .72-.73 is to reduce thermal shock and keep the egt cool as long as possible before cot kicks in. It also allows a little more timing that cools egt further.

 

[Joshinator99]

The idea of running it at .72-.73 is to reduce thermal shock and keep the egt cool as long as possible before cot kicks in. It also allows a little more timing that cools egt further.

Interesting, thanks Mike.

 

[engineermike]

Having a hard time finding gt500 cats used and dealer wants like crazy amount of money for them.

There are at least 3 sets on eBay right now.

 

[engineermike]

5 sets of gt500 cats on eBay currently if anyone wants to convert over.

 

[22Coyoti]

5 sets of gt500 cats on eBay currently if anyone wants to convert over.

Could u share a link i still cant find

 

[engineermike]

https://www.ebay.com/itm/1267796981...dEe8hNFMvBYE7xxN/au+XuyA==|tkp:Bk9SR_yv8a7tZA

 

[engineermike]

https://www.ebay.com/itm/1867428861...LSojCROpampz4jc2B41qP22VA=|tkp:Bk9SR_6v8a7tZA

 

[engineermike]

https://www.ebay.com/itm/1867428766...+vGPu6sdny6P9inNFBSZRjNZk=|tkp:Bk9SR_6v8a7tZA

 

[engineermike]

https://www.ebay.com/itm/1867428847...E6RZ+mKPDl+eBOaZAXMk+CVX4=|tkp:Bk9SR_6v8a7tZA

 

[engineermike]

Note the 5.2 manifolds do not mate to coyote heads.

 

[22Coyoti]

Note the 5.2 manifolds do not mate to coyote heads.

How Challenging is it to get it to work? I really wanted to leave the stock headers and cats and the reasoning is kinda making me want to stay away from boost even tho I only want to be conservative and use whipples tune. If i were to do it I would do the gt500 cats

 

[engineermike]

Post 9

https://www.mustang6g.com/forums/threads/tune-with-boost-question.202087/#post-4048999

 

[engineermike]

In hindsight I think I would try a gen1 drivers side header. It has a 2-bolt flange already and will bolt to the coyote head. The flange is clocked 90 deg out, so a short adapter would be needed but I think this would be easier and better than modifying a stock gen2/3 header to accept a 2-bolt flange.

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