does not having back preassure increase mpg?
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From: bay area, ca
does not having back preassure increase mpg?
it seems like it does for me. i recently took off my muffler to do an experiment w/ my gas mileage cuz ive heard things about back pressure and mileage. when i had my muffler on i got like 120 miles till half tank and w/ my muffler off im at 160 and still have more than a 1/2 tank left.
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From: In my kevlar STATUS Legunas, PALLDAY
Re: does not having back preassure increase mpg? (sloz64now)
thats because your computer recognizes it isnt there and is running your engine differently. bad idea, have fun 
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From: Greeley, co, USA
Re: does not having back preassure increase mpg? (jdmspoonfan)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jdmspoonfan »</TD></TR><TR><TD CLASS="quote">thats because your computer recognizes it isnt there and is running your engine differently. bad idea, have fun </TD></TR></TABLE>
um, I didn't know that Hondas had a muffler sensor?!?! lol....CEL 234202 - Lost muffler
Backpressure is an odd subject. I have been told that some cars run better with backpressure, kind of interesting. I would think that allowing the exhaust to escape freeley would help the car to run better and thats what you have seen by removing your muffler.
</TD></TR></TABLE>um, I didn't know that Hondas had a muffler sensor?!?! lol....CEL 234202 - Lost muffler
Backpressure is an odd subject. I have been told that some cars run better with backpressure, kind of interesting. I would think that allowing the exhaust to escape freeley would help the car to run better and thats what you have seen by removing your muffler.
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From: long island, ny, usa
Re: does not having back preassure increase mpg? (flood)
back pressure helps with low end power. u put a 3 inch exhaust on ur stock civic and its gonna suck till u get to high rpms...for a race car u want the least backpressure possible, especially with turbo
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Re: does not having back preassure increase mpg? (sloz64now)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sloz64now »</TD></TR><TR><TD CLASS="quote">it seems like it does for me. i recently took off my muffler to do an experiment w/ my gas mileage cuz ive heard things about back pressure and mileage. when i had my muffler on i got like 120 miles till half tank and w/ my muffler off im at 160 and still have more than a 1/2 tank left. </TD></TR></TABLE>
How many tanks did you run with the muffler on, and what were your milage figures? Using one 1/2 tank, looking at the milage, then doing the same without the muffler is hardly a controled test.
I know my milage can be +/- 8 mpg per tank depending on conditions and driving style; but the average is around 30 (based upon 85K miles). You'd seriously need to monitor for at least 10 tanks before and after under the same conditions to determine if it helps or not; and I would assume it's probably pretty minimal.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by flood »</TD></TR><TR><TD CLASS="quote">
Backpressure is an odd subject. I have been told that some cars run better with backpressure, kind of interesting. I would think that allowing the exhaust to escape freeley would help the car to run better and thats what you have seen by removing your muffler. </TD></TR></TABLE>
Backpressure is really a misnomer, which is why there is so much misinformation about it. Too little, and there isn't enough velocity in your exhaust for the gasses to flow properly. Too much, and it becomes too restrictive. You want to keep a high velocity and smooth flow in the exhaust system for optimum horsepower and torque.
How many tanks did you run with the muffler on, and what were your milage figures? Using one 1/2 tank, looking at the milage, then doing the same without the muffler is hardly a controled test.
I know my milage can be +/- 8 mpg per tank depending on conditions and driving style; but the average is around 30 (based upon 85K miles). You'd seriously need to monitor for at least 10 tanks before and after under the same conditions to determine if it helps or not; and I would assume it's probably pretty minimal.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by flood »</TD></TR><TR><TD CLASS="quote">
Backpressure is an odd subject. I have been told that some cars run better with backpressure, kind of interesting. I would think that allowing the exhaust to escape freeley would help the car to run better and thats what you have seen by removing your muffler. </TD></TR></TABLE>
Backpressure is really a misnomer, which is why there is so much misinformation about it. Too little, and there isn't enough velocity in your exhaust for the gasses to flow properly. Too much, and it becomes too restrictive. You want to keep a high velocity and smooth flow in the exhaust system for optimum horsepower and torque.
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From: bay area, ca
Re: does not having back preassure increase mpg? (EX_AutoXer)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EX_AutoXer »</TD></TR><TR><TD CLASS="quote">How many tanks did you run with the muffler on, and what were your milage figures? Using one 1/2 tank, looking at the milage, then doing the same without the muffler is hardly a controled test.
</TD></TR></TABLE>
like every one since oct of last yr, and with the muffler off im driving w/ open throttle more and still getting better mileage.
</TD></TR></TABLE>
like every one since oct of last yr, and with the muffler off im driving w/ open throttle more and still getting better mileage.
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Re: does not having back preassure increase mpg? (sloz64now)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sloz64now »</TD></TR><TR><TD CLASS="quote">
like every one since oct of last yr, and with the muffler off im driving w/ open throttle more and still getting better mileage.</TD></TR></TABLE>
Why cause it sounds cool. Welcome to the performance world where if you complain about gas mileage, get out.
like every one since oct of last yr, and with the muffler off im driving w/ open throttle more and still getting better mileage.</TD></TR></TABLE>
Why cause it sounds cool. Welcome to the performance world where if you complain about gas mileage, get out.
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Re: does not having back preassure increase mpg? (sohcvtec1995)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sohcvtec1995 »</TD></TR><TR><TD CLASS="quote">
Why cause it sounds cool. Welcome to the performance world where if you complain about gas mileage, get out.</TD></TR></TABLE>
I still get 40mpg in my boosted hatch. Just because you're fast, doesn't mean you can't have great gas mileage too.
I have yet to see ANY tests that show backpressure as a good thing for an engine.
Why cause it sounds cool. Welcome to the performance world where if you complain about gas mileage, get out.</TD></TR></TABLE>
I still get 40mpg in my boosted hatch. Just because you're fast, doesn't mean you can't have great gas mileage too.
I have yet to see ANY tests that show backpressure as a good thing for an engine.
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From: bay area, ca
Re: does not having back preassure increase mpg? (sohcvtec1995)
did it look like i was complaining u ****? no i was asking a ******* question. y dont u get the **** out of my thread since u have no useful info.
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Re: does not having back preassure increase mpg? (Ricey McRicerton)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Ricey McRicerton »</TD></TR><TR><TD CLASS="quote">
I still get 40mpg in my boosted hatch. Just because you're fast, doesn't mean you can't have great gas mileage too.
I have yet to see ANY tests that show backpressure as a good thing for an engine. </TD></TR></TABLE>
Yea thats tru, but in most cases as you are adding bigger injectors, Fmu's, bigger fuel pumps, and FPR, rails, and making major changes to the air and fuel ratio of the motor then there will always be a loss in MPG, unless you did some really good tuning. Befor i got my car dynoed and tuned i was pulling like 220 highway, with a bit of city and that was normal driving. Now i can pull like 300 city and still get on it everyonce in awhile.
I still get 40mpg in my boosted hatch. Just because you're fast, doesn't mean you can't have great gas mileage too.
I have yet to see ANY tests that show backpressure as a good thing for an engine. </TD></TR></TABLE>
Yea thats tru, but in most cases as you are adding bigger injectors, Fmu's, bigger fuel pumps, and FPR, rails, and making major changes to the air and fuel ratio of the motor then there will always be a loss in MPG, unless you did some really good tuning. Befor i got my car dynoed and tuned i was pulling like 220 highway, with a bit of city and that was normal driving. Now i can pull like 300 city and still get on it everyonce in awhile.
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Re: does not having back preassure increase mpg? (sloz64now)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sloz64now »</TD></TR><TR><TD CLASS="quote">did it look like i was complaining u ****? no i was asking a ******* question. y dont u get the **** out of my thread since u have no useful info.</TD></TR></TABLE>
well you obiously had a original question on the impact of running less back pressure and then the end result of your gas mileage. So i am answering your question so back off, If you want help and info.
well you obiously had a original question on the impact of running less back pressure and then the end result of your gas mileage. So i am answering your question so back off, If you want help and info.
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From: Orlando FL, USA
Re: does not having back preassure increase mpg? (sloz64now)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sloz64now »</TD></TR><TR><TD CLASS="quote">did it look like i was complaining u ****? no i was asking a ******* question. y dont u get the **** out of my thread since u have no useful info.</TD></TR></TABLE>
Why don't you take a step back Mr. class of 04 and take a deep breath. You arent going to last long with comments like that.
Why don't you take a step back Mr. class of 04 and take a deep breath. You arent going to last long with comments like that.
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From: Orlando FL, USA
Re: does not having back preassure increase mpg? (Ricey McRicerton)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Ricey McRicerton »</TD></TR><TR><TD CLASS="quote">
I still get 40mpg in my boosted hatch. Just because you're fast, doesn't mean you can't have great gas mileage too.
I have yet to see ANY tests that show backpressure as a good thing for an engine. </TD></TR></TABLE>
Last time I checked, a little backpressure in the manifold helps to draw excess (sp?) exhaust from the combustion chamber meaning a cleaner burn on the next cycle. In some cases this is helpfull and in some it's not. This is just what i've come across because the backpressure topic comes up a lot.
I still get 40mpg in my boosted hatch. Just because you're fast, doesn't mean you can't have great gas mileage too.
I have yet to see ANY tests that show backpressure as a good thing for an engine. </TD></TR></TABLE>
Last time I checked, a little backpressure in the manifold helps to draw excess (sp?) exhaust from the combustion chamber meaning a cleaner burn on the next cycle. In some cases this is helpfull and in some it's not. This is just what i've come across because the backpressure topic comes up a lot.
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Re: does not having back preassure increase mpg? (Revolver)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Revolver »</TD></TR><TR><TD CLASS="quote">
Last time I checked, a little backpressure in the manifold helps to draw excess (sp?) exhaust from the combustion chamber meaning a cleaner burn on the next cycle. In some cases this is helpfull and in some it's not. This is just what i've come across because the backpressure topic comes up a lot.</TD></TR></TABLE>
Yup, a little backpressure is a good thing. A lot is a bad thing.
Last time I checked, a little backpressure in the manifold helps to draw excess (sp?) exhaust from the combustion chamber meaning a cleaner burn on the next cycle. In some cases this is helpfull and in some it's not. This is just what i've come across because the backpressure topic comes up a lot.</TD></TR></TABLE>
Yup, a little backpressure is a good thing. A lot is a bad thing.
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