Exhaust question
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Joined: Feb 2009
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From: CONNECTICUT
Exhaust question
Hey guys, i disconnected my exhaust from the muffler (i was getting ready to install my new one but it won't be here for another week) anyway it is running out the stock 3 inch pipe just before the muffler. Did this hurt anthing? It seems like a dog when it warms up!! Or is it just in my head?
Posting Guru
Joined: Jan 2009
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From: Mattawa Washington.
exhaust isn't scavenging correctly. other than poor performance should not hurt your motor.Been told that if exhaust is straight out of the manifolds the valves can cool too fast and warp. But no facts to back it up, and you are longer than that anyway.
Post Fiend
Joined: Jun 2004
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From: Parker, CO
No such thing on the Powerstroke. The turbo takes care of that. Anything other than a huge air horn exhaust after the turbo is a restriction and detrimental to performance.
Posting Guru
Joined: May 2006
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From: Milroy, PA
If your thinking its a dog while its warming up, and you just took off after the muffler, its more then likely because now your hearing the engine work. before, it didnt make much noise, and you watched your rpm gauge move, and listened to your injectors, now your hearing it work. Laugh if you will, but I know I get better fuel mileage too, since I put my muffler back on my 4" kit. Because Im not "listening for it"
Senior User
Joined: Apr 2007
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From: Memphis
If your thinking its a dog while its warming up, and you just took off after the muffler, its more then likely because now your hearing the engine work. before, it didnt make much noise, and you watched your rpm gauge move, and listened to your injectors, now your hearing it work. Laugh if you will, but I know I get better fuel mileage too, since I put my muffler back on my 4" kit. Because Im not "listening for it"
Disclaimer: I am a n00b and am just trying to get clarification.
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Post Fiend
Joined: Apr 2007
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From: Powder Springs, East TN
Nope it won't hurt a thing thats how mine was run and still is exiting right before the rear wheel. You will get better mileage and lower your EGTs down as well Geoff.
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Joined: Apr 2007
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From: Memphis
Thanks for the clarification.
Posting Guru
Joined: May 2006
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From: Milroy, PA
I put a 4" exhaust on a while ago, and ran it straight for a while. Then I added the muffler, due to the excessive (IMO) noise in traffic when you needed to get on it hard. I have noticed, that since I put the muffler on, I actually am getting better mpg. I do not attribute any of the gain, to the muffler itself, in its physical sense. With it straight, I tended to listen to the exhaust, and make it the way I liked to listen to it. With the muffler on, it quieted it down some, and I no longer listen for the things I did before, because some of the things I liked dissapeared. Ultimately the difference in mpg was due to driving characteristics, but that was because of me listening to the exhaust sing. Not a physical thing here, just like to listen to the turbo.
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Joined: Apr 2007
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From: Memphis
I put a 4" exhaust on a while ago, and ran it straight for a while. Then I added the muffler, due to the excessive (IMO) noise in traffic when you needed to get on it hard. I have noticed, that since I put the muffler on, I actually am getting better mpg. I do not attribute any of the gain, to the muffler itself, in its physical sense. With it straight, I tended to listen to the exhaust, and make it the way I liked to listen to it. With the muffler on, it quieted it down some, and I no longer listen for the things I did before, because some of the things I liked dissapeared. Ultimately the difference in mpg was due to driving characteristics, but that was because of me listening to the exhaust sing. Not a physical thing here, just like to listen to the turbo.
I don't do a lot of towing so I am still not sure if I want to go straight pipes or not. I do NOT want to sound like a Harrier jet landing. I am just wanting better MPG and performance (mainly MPG).
Posting Guru
Joined: May 2006
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From: Milroy, PA
I did alot of things that were geared towards mileage. Sadly enough, the only thing that seemed to make a difference (on my truck anyways) was not exceeding 60mph, and setting my cruise there on the interstate. Now I just sit back and watch everybody pass. It doesnt hurt my pride anymore. Summer mileage used to be 14.5-15 doing about 68-70. Summer mileage hit an all time high of 17.9 this past summer(accross a 47 gallon tank, that was 800 miles on a single tank!) , setting the cruise at 60. The two most important things for mpg, (in my oppinion of course) are tire pressure, and driving habits. If I lose 5psi, I notice a mpg or so. I always run my tires at 65 psi, unless I need to air down some, for icy/off road conditions.
EDIT: I almost forgot the other reason Ill air down some, to drag a dodge a long way in reverse of couse
EDIT: I almost forgot the other reason Ill air down some, to drag a dodge a long way in reverse of couse
Senior User
Joined: Apr 2007
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From: Memphis
I did alot of things that were geared towards mileage. Sadly enough, the only thing that seemed to make a difference (on my truck anyways) was not exceeding 60mph, and setting my cruise there on the interstate. Now I just sit back and watch everybody pass. It doesnt hurt my pride anymore. Summer mileage used to be 14.5-15 doing about 68-70. Summer mileage hit an all time high of 17.9 this past summer(accross a 47 gallon tank, that was 800 miles on a single tank!) , setting the cruise at 60. The two most important things for mpg, (in my oppinion of course) are tire pressure, and driving habits. If I lose 5psi, I notice a mpg or so. I always run my tires at 65 psi, unless I need to air down some, for icy/off road conditions.
EDIT: I almost forgot the other reason Ill air down some, to drag a dodge a long way in reverse of couse
EDIT: I almost forgot the other reason Ill air down some, to drag a dodge a long way in reverse of couse
Posting Guru
Joined: May 2006
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From: Milroy, PA
Well like I said, for me, the was never any difference with my previous driving habits. Other then having better acceleration, and better normal day to day driving. (Mostly from the chip) The truck always got right about 15 in the summer. Did the exhaust, intake, few other little things, no difference. Finally told myself, "self, its time to slow down, and try to mostly behave". Set the cruise to 60, and well, like I said, saw upto 17.9, last summer. Now, without everything Ive done to get were the trucks at now, I cant say it would have still gotten 17.9mpg, with my new driving habits. But that is what it finally took to get the mileage number up. Granted others have noticed better results, but this is just MY personal experience, and MY personal results.