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Joined: Jan 2007
Posts: 92
Likes: 0
Too much fuel in the exhaust....this will cause the cats to get too hot which makes them melt....therefore causing them not to allow air to pass through them. The answer is in the tune my friend. There are plenty of oem cars with FI that have cats in the manifold (ie Mini Cooper type S).
Or if you previously had a cam that had a huge overlap I could see that doing the same thing (basically dumping raw fuel into the exhaust)
Or if you previously had a cam that had a huge overlap I could see that doing the same thing (basically dumping raw fuel into the exhaust)
OEM level Cat Over Temp protection systems enrich the fuel ratio to cool the cats and then they actually add timing (up to 10 degrees in some applications) with the significantly enriched mixture. You can see it in every OEM calibration. GM trucks have a rather aggressive COT protection - Max commanded AFR could be 8.02 with maximum COT protection active at 4800 RPM on a 2006 5.3L!!!
I also had the pleasure of knowing John Germanson over at Magnuson and had the opportunity to discuss COT with him as he was testing internal cat temps on Magnuson's engine dyno. How does 800+ ft/lbs on a 6L motor running for an hour at 4000 RPM's and not overheating the OEM cats sound? He was measuring the internal brick temp as well as the inlet and outlet temperatures of the OEM cats. It's all about the fueling and timing for cat thermal protection.
If you want to kill the cat quickly, run it lean with low timing.
Burning Brakes
Joined: Apr 2008
Posts: 946
Likes: 0
From: 1BadC6 New Jersey
St. Jude Donor '08
As far as the offroad pipe goes its only 450.00$ It bolts on and off
Do as you like, Its not worth it to me to take a chance and blow a head gasket or worse. 450 is insurance that I wont have a problem and help with some horses with the paxton and 8 pounds of boost
Do as you like, Its not worth it to me to take a chance and blow a head gasket or worse. 450 is insurance that I wont have a problem and help with some horses with the paxton and 8 pounds of boost
Racer
Joined: Apr 2006
Posts: 279
Likes: 0
From: Stage TN
Thread Starter
Pro
Joined: Oct 2003
Posts: 639
Likes: 0
From: springfield missouri
No problem with cats at all, just don't want to tear down again or have a breakdown. My car smells nice
Race Director
Joined: Dec 2005
Posts: 11,948
Likes: 107
From: God's Country, ID
Burning Brakes
Joined: Apr 2008
Posts: 946
Likes: 0
From: 1BadC6 New Jersey
St. Jude Donor '08
You could do those 12 pipes too. The offroad pipe is longer 3 feet or so
I just left Chris at ECS a couple of hours ago He says unless your running 14 psi of boost or more you dont need the offroad pipe.
I plan to run 8psi so he said no exaust is needed. He says the paxton D1 sc 600 on a stock vette no other changes except slicks will run in the 10s!!!!!
I said what???????????? he said it again. He also said not many people can drive that well or launch the car. Chris also said the clutch wont last long doings this. He said the car wasnt designed to race on 1/4 mile strip. Atco raceway in NJ wont let you run that fast without a roll cage etc anyway so street racing it is.The reason guys are blowing head gaskets, melting cats etc is a bad tune. When I saw Chris he said the same thing those cars with the cat and head problems
need a tune. Boy did I learn alot today
I just left Chris at ECS a couple of hours ago He says unless your running 14 psi of boost or more you dont need the offroad pipe.
I plan to run 8psi so he said no exaust is needed. He says the paxton D1 sc 600 on a stock vette no other changes except slicks will run in the 10s!!!!!
I said what???????????? he said it again. He also said not many people can drive that well or launch the car. Chris also said the clutch wont last long doings this. He said the car wasnt designed to race on 1/4 mile strip. Atco raceway in NJ wont let you run that fast without a roll cage etc anyway so street racing it is.The reason guys are blowing head gaskets, melting cats etc is a bad tune. When I saw Chris he said the same thing those cars with the cat and head problems
need a tune. Boy did I learn alot today
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Melting Slicks
Joined: Feb 2006
Posts: 2,007
Likes: 1
From: Eastern PA:ECS Paxton Novi 1500(676rwhp,585tq on stock engine),LG headers, 410's, Corsa Sports, ECS Alky Kit
St. Jude Donor '08-'09
I agree!
