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6.0L Power Stroke Engine and Drivetrain Discussion of the 6.0L Power Stroke diesel engine and drivetrain in the 2003-Up Super Duties and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 6.0L Power Stroke engine.

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Old 07-24-2005, 08:16 PM   #1 (permalink)
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compression problems

If i remove the cat and muffler on my 2003 6.0L PSD will it cause compression problems and cause the engine not to run right? I was wondering because thats what my dealer told me.
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Old 07-24-2005, 09:27 PM   #2 (permalink)
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Re: compression problems

That is a typical dealer response. Those guys don't know anything and will try to BS you into their way of thinking. Remove everything if you like. It will be loud, but it will run great.

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Old 07-24-2005, 10:01 PM   #3 (permalink)
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Re: compression problems

Boy... after Daves knowledgeable response, I'm lost for words....

Of course us trained guys are idiots... we should realize that the engineers and our experiences are wrong, wrong, wrong..... It matters not that we work on these things day after day... Dave has a 6.0 and he knows all about them.

Is your dealer wrong? Well, I feel I'm getting but a small part of the tale...

There are a lot of owners out there that should not have a diesel simply because their driving styles/conditions don't create the conditions these trucks need to remain healthy. Modifications can and will create conditions that the PCM programming cannot deal with.

FWIW... I have very few customers that feel the need to modify their trucks.... I have very few customers with concerns I can't fix on the first visit.

Sig lines are informative yet tiresome... I have no problem with people being proud of their ride (personally, they are machines and these machines get me from where I am to where I want to be....) but some of this stuff is over the top.... I'm just waiting for someone to brag about his light-up valve caps....
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Old 07-24-2005, 11:16 PM   #4 (permalink)
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Re: compression problems

Removing your cat is illegal and can not be advocated on this site.

However:

What I have read on this site from aftermarket vendors is that taking the cat off does not help performance very much. ( I have not tried this and do not intend to)

So, why not just leave it on and avoid warranty issues and legal issues? You might also want to leave a little piece of the planet intact for your children. Or Grampy's grandchildren.
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Old 07-24-2005, 11:42 PM   #5 (permalink)
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Re: compression problems

[ QUOTE ]
If i remove the cat and muffler on my 2003 6.0L PSD will it cause compression problems and cause the engine not to run right? I was wondering because thats what my dealer told me.

[/ QUOTE ]

I am running a full turbo-back MBRP exhaust on mine and have been for quite a while now. I did keep the muffler because I don't really care for the straight pipe sound. But the MBRP muffler is huge on the inside, so I can't imagine there is much restriction there. A couple of months ago, I hooked it up to an Auto Enginuity scanner and looked at a bunch of things, the EBP being one of them. It was dead on what Ford says it should be.

After seeing that, and having absolutely no codes show up, I have to believe this whole "theory" that some Ford folks throw out about the need for backpressure is pure unadulterated bunk.

Take it for what it's worth and do as you wish....
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Old 07-25-2005, 02:16 AM   #6 (permalink)
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Re: compression problems

Removing your cat will not change compression, but it will change your emissions and this is why a dealer cannot take it off because they would be liable and face a penalty if caught.
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Old 07-25-2005, 08:23 AM   #7 (permalink)
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Re: compression problems

the pipes on the cat can be cut off and larger ones to mate with your big pipes can be welded on.turbo diesels dont need "back pressure" like gas engines. they would be the best with no pipe at the turbo. the less back pressure the better.
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Old 07-25-2005, 02:41 PM   #8 (permalink)
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Re: compression problems

grampy jim you didnt really answer the question. Is it bad for the engine or not?
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Old 07-25-2005, 02:48 PM   #9 (permalink)
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Re: compression problems

[ QUOTE ]
[ QUOTE ]
If i remove the cat and muffler on my 2003 6.0L PSD will it cause compression problems and cause the engine not to run right? I was wondering because thats what my dealer told me.

[/ QUOTE ]

I am running a full turbo-back MBRP exhaust on mine and have been for quite a while now. I did keep the muffler because I don't really care for the straight pipe sound. But the MBRP muffler is huge on the inside, so I can't imagine there is much restriction there. A couple of months ago, [b]I hooked it up to an Auto Enginuity scanner and looked at a bunch of things, the EBP being one of them. It was dead on what Ford says it should be.

After seeing that, and having absolutely no codes show up, I have to believe this whole "theory" that some Ford folks throw out about the need for backpressure is pure unadulterated bunk.[b]

Take it for what it's worth and do as you wish....

[/ QUOTE ]

Really?
When you hooked up the truck on the WDS, I could imagine you went for a data logging drive. What was the voltage reading you got from your EBP sensor ( voltage ) and ICP Psi at WOT?


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