Muffler delete= check engine codes and poor performance?
Lead Driver
Joined: May 2007
Posts: 5,613
Likes: 9
From: Flagstaff, Arizona
He is using the theory of backpressure for a GAS engine. Never ever heard of any codes from straight exhaust. I've had both on my truck, and no codes, I too get that "whoosh" of cold air from the passenger rear window now that I have 4" and straight piped 
Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
Originally Posted by ron01sd
how about a double bullsh.it burger with a side of turd totts
Thanks Ron, I needed a good laugh before I head off to bed. It will give me a good start on tomorrow.
Elder User
Joined: May 2007
Posts: 936
Likes: 0
From: Carlos, MN
The guy doesn't know what he is talking about, back pressure is really only needed for the engine, and the back pressure in a PSD is created by the turbo. Cut out the muffler it will run great, plus faster spool up, so more peformance not less, and I don't know why it would throw a code, besides EBPV creates the back pressure to warm up the engine faster, it should matter what is behind it.
Freshman User
Joined: Sep 2006
Posts: 25
Likes: 0
A buddy put my 4" , turbo back straight pipe in last weekend, and a big box intake, Sounds great, the rushing air in the morning, is from the waste gate shutting, until it warms up, he says.. He used to be a Ford diesel mechanic, .02 worth
Now I, have to replace my front wheel bearings. He said use Ford stuff, he can get a deal, what do ya'll think?
Now I, have to replace my front wheel bearings. He said use Ford stuff, he can get a deal, what do ya'll think?
Cargo Master
Joined: Apr 2004
Posts: 3,162
Likes: 1
From: Vilonia Arkansas
Originally Posted by TXCC1952
A buddy put my 4" , turbo back straight pipe in last weekend, and a big box intake, Sounds great, the rushing air in the morning, is from the waste gate shutting, until it warms up, he says.. He used to be a Ford diesel mechanic,
Thats not the waste gate closing it's the EBPV closing to help it warm up.
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Lead Driver
Joined: Jun 2007
Posts: 7,760
Likes: 27
From: Hampton, Maryland.
Originally Posted by sideshow
better question, have you been running that DP tuner with a stock exhaust until now? what kinda EGT's you been seeing?
He used to be the head diesel mechanic at a very reputable Ford dealer outside of Baltimore, but he has to be crazy on this one.
I'm going to take it somewhere else.
Senior User
Joined: Feb 2002
Posts: 323
Likes: 0
From: Valley Center, Kansas
Originally Posted by cookie88
Uh....no. The turbo creates all the backpressure the engine needs, and the EBPV doesn't need backpressure, it makes it.
On a gas motor this would be true, as anyone that has had the bright idea to remove the muffler or run open headers will tell ya.
Ya I opened the headers and I have no low end now... It's weird... And I don't know what happened???
I have never owned a non-turbo diesel motor vehicle, so I do not know the effects that it would have to open the exhaust on one.
Doing mine next week...
Doc.
Mountain Pass
Joined: Jan 2009
Posts: 167
Likes: 1
I had an old chevy 350 and had exh. cutouts for racing and had no problems with running open headers (other than the noise and heating up my legs when I got out).
I did have a high duration cam so I didnt have low end anyways, but thats why I ran tall gears.
It was an old 78 1/2 ton pickup that ran mid 11's. I blew the doors off plenty of "hot rod" cars with it, including a built 69 coupe Mustang and a 95 IROC Z28. Both of them by at least a truck length. Maybe I was missing power from only running headers into a 4" 90* piece of pipe about 10 " long, but I didnt notice.
As far as a diesel goes, open up the exhaust. The faster you can get the exhaust out, the better it will run.
I did have a high duration cam so I didnt have low end anyways, but thats why I ran tall gears.
It was an old 78 1/2 ton pickup that ran mid 11's. I blew the doors off plenty of "hot rod" cars with it, including a built 69 coupe Mustang and a 95 IROC Z28. Both of them by at least a truck length. Maybe I was missing power from only running headers into a 4" 90* piece of pipe about 10 " long, but I didnt notice.
As far as a diesel goes, open up the exhaust. The faster you can get the exhaust out, the better it will run.