Exhaust questions
New User
Joined: Sep 2005
Posts: 20
Likes: 0
From: key largo florida
thanks mark i will try it
is the stock down pipe on a 2006 restricting the engine
how about the muffler
where is the restricion if there is any in the syatem also does it have to be loud to be
better i like it quiet but not silent like it is now all i hear is the turbo
thanks wayne
is the stock down pipe on a 2006 restricting the engine
how about the muffler
where is the restricion if there is any in the syatem also does it have to be loud to be
better i like it quiet but not silent like it is now all i hear is the turbo
thanks wayne
Senior User
Joined: Sep 2003
Posts: 330
Likes: 0
Man this reads like a commercial!
Let me review what was said:
Aluminized for non-salt enviroments..the south!!!! Should last fine for many years.
409 stainless if you dont mind some discoleration. (running a show truck?) Exaust will outlast the truck engine!
300 series stainless if you get on your back and look up at the underside of your truck. (no longevity advantage to 409, but if you want to polish it?)
Did I get this right???
Let me review what was said:
Aluminized for non-salt enviroments..the south!!!! Should last fine for many years.
409 stainless if you dont mind some discoleration. (running a show truck?) Exaust will outlast the truck engine!
300 series stainless if you get on your back and look up at the underside of your truck. (no longevity advantage to 409, but if you want to polish it?)
Did I get this right???
Elder User
Joined: May 2005
Posts: 968
Likes: 0
From: Tennesee
Wayne,
The down pipe in the 2003's is the worst, the newer are better but it's still a restriction overall. If you get our MBRP system and keep the cat in place it's nearly stock sound wise till you flat foot the go pedal. If you take the cat out you'll get 25% more turbo whistle and a little exhaust note when cruising. From what you said I would get it and keep thcat and see what you think abou it, you can always add the cat pipe later.
Mark @ DPPI
The down pipe in the 2003's is the worst, the newer are better but it's still a restriction overall. If you get our MBRP system and keep the cat in place it's nearly stock sound wise till you flat foot the go pedal. If you take the cat out you'll get 25% more turbo whistle and a little exhaust note when cruising. From what you said I would get it and keep thcat and see what you think abou it, you can always add the cat pipe later.
Mark @ DPPI
New User
Joined: Sep 2005
Posts: 20
Likes: 0
From: key largo florida
ok markdpp
i went to ford today and asked for the service manager i asked him to explan
to me about the exhaust he said theres not a problem changing the exhaust till you have a problem i said give it to me in writing that i can t change it he said
i could change from the cat back only because if i change the down pipe or anything else like that the back pressure will change and make the turbo work harder and the oil cooler will not be able to cool it and the turbo can over heat and have cooling problems but still did not give it to me in writing
question to you is will it make any differance just changing the muffler
or what about a straight where the muffler is the cat gives the back pressure right
i went to ford today and asked for the service manager i asked him to explan
to me about the exhaust he said theres not a problem changing the exhaust till you have a problem i said give it to me in writing that i can t change it he said
i could change from the cat back only because if i change the down pipe or anything else like that the back pressure will change and make the turbo work harder and the oil cooler will not be able to cool it and the turbo can over heat and have cooling problems but still did not give it to me in writing
question to you is will it make any differance just changing the muffler
or what about a straight where the muffler is the cat gives the back pressure right
Senior User
Joined: Sep 2004
Posts: 235
Likes: 0
From: S.W. Michigan
Originally Posted by 2006 PSDamarillo
he said i could change from the cat back only because if i change the down pipe or anything else like that the back pressure will change and make the turbo work harder and the oil cooler will not be able to cool it and the turbo can over heat and have cooling problems...
But that is my swing on things, I could be completely wrong.
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Former Vendor
Joined: Mar 2004
Posts: 4,362
Likes: 3
From: Hendersonville, NC
Originally Posted by laredo7mma
That to me, doesn't make sense. The VG turbo will only provide the amount of boost the engine is calling for. By reducing the back pressure the turbo would be able to provid the needed boost more efficiently, hence doing less work.
But that is my swing on things, I could be completely wrong.
But that is my swing on things, I could be completely wrong.
The VGT closes in order to raise the backpressure, which in turn raises the boost. As engine exhaust flow comes up, the VGT opens proportionately to maintain a stable EBP, and in turn a stable boost level.
You can turn the commanded EBP up too far, and it will make tons of boost, but not much more power because the turbo isn't efficient past a certain flow ratio. The engine has to fight too much backpressure in order to get exhaust out, and the overall power can actually start to drop at a certain point. 260-270 KPA is about as high as you will ever want to go as far as a 6.0 is concerned with efficiency. The VGT is one of the most difficult aspects of tuning the 6.0 engine.
Elder User
Joined: May 2005
Posts: 968
Likes: 0
From: Tennesee
2006 Psdamarillo,
RUNNNNNNN from that dealer he is out of him mind. The oil system does lube and cool the turbo shaft bearing surface, but it's impact oin the oil temp and or cooler is zip, zilch nada etc. I have heardrdelaers tell folks their tranny won't shift right if they change exhaust, these guys sure do seem to get creative!!!
Dropping the muffler helps, any redcution in restirction will help. It's a cost to effort deal, can you find a shop in town that can bend 3.5 inch, not usually in most towns. If you do it'll cost you 100-150.00 maybe to get it done. Then you're still at 3.5 inch and non mabdrel bends etc. A cat back is as low as 350.00 ish, you can bolt it on, it's 4.0 and mandrel bent, has a good 0 restriction muffler, looks right and sounds good too. So it's a call you have to make based on performance and dollars etc.
Mark @ DPPI
RUNNNNNNN from that dealer he is out of him mind. The oil system does lube and cool the turbo shaft bearing surface, but it's impact oin the oil temp and or cooler is zip, zilch nada etc. I have heardrdelaers tell folks their tranny won't shift right if they change exhaust, these guys sure do seem to get creative!!!
Dropping the muffler helps, any redcution in restirction will help. It's a cost to effort deal, can you find a shop in town that can bend 3.5 inch, not usually in most towns. If you do it'll cost you 100-150.00 maybe to get it done. Then you're still at 3.5 inch and non mabdrel bends etc. A cat back is as low as 350.00 ish, you can bolt it on, it's 4.0 and mandrel bent, has a good 0 restriction muffler, looks right and sounds good too. So it's a call you have to make based on performance and dollars etc.
Mark @ DPPI
Senior User
Joined: Sep 2004
Posts: 235
Likes: 0
From: S.W. Michigan
Originally Posted by PSD 60L Fx4
More backpressure = more boost...to a certain extent.
The VGT closes in order to raise the backpressure, which in turn raises the boost. As engine exhaust flow comes up, the VGT opens proportionately to maintain a stable EBP, and in turn a stable boost level.
You can turn the commanded EBP up too far, and it will make tons of boost, but not much more power because the turbo isn't efficient past a certain flow ratio. The engine has to fight too much backpressure in order to get exhaust out, and the overall power can actually start to drop at a certain point. 260-270 KPA is about as high as you will ever want to go as far as a 6.0 is concerned with efficiency. The VGT is one of the most difficult aspects of tuning the 6.0 engine.
The VGT closes in order to raise the backpressure, which in turn raises the boost. As engine exhaust flow comes up, the VGT opens proportionately to maintain a stable EBP, and in turn a stable boost level.
You can turn the commanded EBP up too far, and it will make tons of boost, but not much more power because the turbo isn't efficient past a certain flow ratio. The engine has to fight too much backpressure in order to get exhaust out, and the overall power can actually start to drop at a certain point. 260-270 KPA is about as high as you will ever want to go as far as a 6.0 is concerned with efficiency. The VGT is one of the most difficult aspects of tuning the 6.0 engine.
Does the computer call for MAP or EBP in the fueling curve? If it monitors and adjusts for MAP then free flow post turbo would be a good thing. If it calls for boost based on EBP derived from eperical data collected on a stock equiped 6.0L, then less post turbo restriction might not be a good thing.
Former Vendor
Joined: Mar 2004
Posts: 4,362
Likes: 3
From: Hendersonville, NC
Originally Posted by laredo7mma
So post turbo, less restriction is better right? That should allow the exhaust gases to exit the turbine section faster calling for less EBP to run the turbo for a given amount of boost.
Does the computer call for MAP or EBP in the fueling curve? If it monitors and adjusts for MAP then free flow post turbo would be a good thing. If it calls for boost based on EBP derived from eperical data collected on a stock equiped 6.0L, then less post turbo restriction might not be a good thing.
Does the computer call for MAP or EBP in the fueling curve? If it monitors and adjusts for MAP then free flow post turbo would be a good thing. If it calls for boost based on EBP derived from eperical data collected on a stock equiped 6.0L, then less post turbo restriction might not be a good thing.