Stock cat bad?
Apr 30, 2010, 12:07 PM
#20
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When i called the dealer they said i would have to put the stock cat back on, then take it to them so they can check it out. Because if i go now with it off then they will say that the damage was done after it was off the car.
Apr 30, 2010, 12:45 PM
#21
I have not seen a thread with this much misinformation in a long time, so I felt compelled to respond.
From this picture (which is very little to go by), that cat looks fine.
The stock 08 tune sucks for sure, but one opinion on it is that it was done that way to preserve catalyst life. Rich factory tune = low EGTs = long cat life. There are cars that have very high EGTs and hotter exhaust pulses (the Mazda RX-8's NA rotary comes to mind) that actually damaged cats with a more aggressive tune.
My opinion is that exhaust shop doesn't know crap. It looks burnt because its coated with lots of soot from running rich. Its not burnt.
If a cat becomes bad and therefore "inefficient", you don't need a muffler shop to tell you! Your car will tell you.
It will throw a catalyst inefficiency code.
One sure fire way to ruin a cat fairly quickly is to run leaded race gas through it. While this will kill O2 sensors over time, it will flat out fry cats. The old shop I used had a few customers with older Evos with stock cats start to throw catalyst inefficiency codes, but it was very, very rare. 100% of the time, the customer had run race gas with the stock cat in place.
I'd lay money that cat is fine. There is no problem that you believed this at first, someone told you and you accepted it. But you need to know it is BS. Have a great weekend.
From this picture (which is very little to go by), that cat looks fine.
The stock 08 tune sucks for sure, but one opinion on it is that it was done that way to preserve catalyst life. Rich factory tune = low EGTs = long cat life. There are cars that have very high EGTs and hotter exhaust pulses (the Mazda RX-8's NA rotary comes to mind) that actually damaged cats with a more aggressive tune.
My opinion is that exhaust shop doesn't know crap. It looks burnt because its coated with lots of soot from running rich. Its not burnt.
If a cat becomes bad and therefore "inefficient", you don't need a muffler shop to tell you! Your car will tell you.
It will throw a catalyst inefficiency code.One sure fire way to ruin a cat fairly quickly is to run leaded race gas through it. While this will kill O2 sensors over time, it will flat out fry cats. The old shop I used had a few customers with older Evos with stock cats start to throw catalyst inefficiency codes, but it was very, very rare. 100% of the time, the customer had run race gas with the stock cat in place.
I'd lay money that cat is fine. There is no problem that you believed this at first, someone told you and you accepted it. But you need to know it is BS. Have a great weekend.
Last edited by Noize; Apr 30, 2010 at 02:40 PM. Reason: rich, not tick. pwnt by autocorrect.
Apr 30, 2010, 01:00 PM
#22
I have not seen a thread with this much misinformation in a long time, so I felt compelled to respond.
From this picture (which is very little to go by), that cat looks fine.
The stock 08 tune sucks for sure, but one opinion on it is that it was done that way to preserve catalyst life. Rich factory tune = low EGTs = long cat life. There are cars that have very high EGTs and hotter exhaust pulses (the Mazda RX-8's NA rotary comes to mind) that actually damaged cats with a more aggressive tune.
My opinion is that exhaust shop doesn't know crap. It looks burnt because its coated with lots of soot from running tick. Its not burnt.
If a cat becomes bad and therefore "inefficient", you don't need a muffler shop to tell you! Your car will tell you. It will throw a catalyst inefficiency code.
One sure fire way to ruin a cat fairly quickly is to run leaded race gas through it. While this will kill O2 sensors over time, it will flat out fry cats. The old shop I used had a few customers with older Evos with stock cats start to throw catalyst inefficiency codes, but it was very, very rare. 100% of the time, the customer had run race gas with the stock cat in place.
I'd lay money that cat is fine. There is no problem that you believed this at first, someone told you and you accepted it. But you need to know it is BS. Have a great weekend.
From this picture (which is very little to go by), that cat looks fine.
The stock 08 tune sucks for sure, but one opinion on it is that it was done that way to preserve catalyst life. Rich factory tune = low EGTs = long cat life. There are cars that have very high EGTs and hotter exhaust pulses (the Mazda RX-8's NA rotary comes to mind) that actually damaged cats with a more aggressive tune.
My opinion is that exhaust shop doesn't know crap. It looks burnt because its coated with lots of soot from running tick. Its not burnt.
If a cat becomes bad and therefore "inefficient", you don't need a muffler shop to tell you! Your car will tell you.
It will throw a catalyst inefficiency code.One sure fire way to ruin a cat fairly quickly is to run leaded race gas through it. While this will kill O2 sensors over time, it will flat out fry cats. The old shop I used had a few customers with older Evos with stock cats start to throw catalyst inefficiency codes, but it was very, very rare. 100% of the time, the customer had run race gas with the stock cat in place.
I'd lay money that cat is fine. There is no problem that you believed this at first, someone told you and you accepted it. But you need to know it is BS. Have a great weekend.
Apr 30, 2010, 01:02 PM
#23
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I have not seen a thread with this much misinformation in a long time, so I felt compelled to respond.
From this picture (which is very little to go by), that cat looks fine.
The stock 08 tune sucks for sure, but one opinion on it is that it was done that way to preserve catalyst life. Rich factory tune = low EGTs = long cat life. There are cars that have very high EGTs and hotter exhaust pulses (the Mazda RX-8's NA rotary comes to mind) that actually damaged cats with a more aggressive tune.
My opinion is that exhaust shop doesn't know crap. It looks burnt because its coated with lots of soot from running tick. Its not burnt.
If a cat becomes bad and therefore "inefficient", you don't need a muffler shop to tell you! Your car will tell you. It will throw a catalyst inefficiency code.
One sure fire way to ruin a cat fairly quickly is to run leaded race gas through it. While this will kill O2 sensors over time, it will flat out fry cats. The old shop I used had a few customers with older Evos with stock cats start to throw catalyst inefficiency codes, but it was very, very rare. 100% of the time, the customer had run race gas with the stock cat in place.
I'd lay money that cat is fine. There is no problem that you believed this at first, someone told you and you accepted it. But you need to know it is BS. Have a great weekend.
From this picture (which is very little to go by), that cat looks fine.
The stock 08 tune sucks for sure, but one opinion on it is that it was done that way to preserve catalyst life. Rich factory tune = low EGTs = long cat life. There are cars that have very high EGTs and hotter exhaust pulses (the Mazda RX-8's NA rotary comes to mind) that actually damaged cats with a more aggressive tune.
My opinion is that exhaust shop doesn't know crap. It looks burnt because its coated with lots of soot from running tick. Its not burnt.
If a cat becomes bad and therefore "inefficient", you don't need a muffler shop to tell you! Your car will tell you.
It will throw a catalyst inefficiency code.One sure fire way to ruin a cat fairly quickly is to run leaded race gas through it. While this will kill O2 sensors over time, it will flat out fry cats. The old shop I used had a few customers with older Evos with stock cats start to throw catalyst inefficiency codes, but it was very, very rare. 100% of the time, the customer had run race gas with the stock cat in place.
I'd lay money that cat is fine. There is no problem that you believed this at first, someone told you and you accepted it. But you need to know it is BS. Have a great weekend.
Apr 30, 2010, 08:10 PM
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One sure fire way to ruin a cat fairly quickly is to run leaded race gas through it. While this will kill O2 sensors over time, it will flat out fry cats. The old shop I used had a few customers with older Evos with stock cats start to throw catalyst inefficiency codes, but it was very, very rare. 100% of the time, the customer had run race gas with the stock cat in place.
I'd lay money that cat is fine. There is no problem that you believed this at first, someone told you and you accepted it. But you need to know it is BS. Have a great weekend.
question for you. Reading about the race gas... if I use octane boost every once in a while when I fill up, will that damage anything? How about the fuel injector cleaners or the other fuel additives made by STP?
Thanks.
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nikkadanny
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