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2.4L LE5 Performance Tech 16 valve 171 hp EcoTec with 163 lb-ft of torque
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No Muffler = Bad Gas Milage!!

This is a discussion on No Muffler = Bad Gas Milage!! within the 2.4L LE5 Performance Tech forums, part of the Engine Technical Discussion category; Ya my 2.4L with no muffler has noticably been sucking back way more fuel with the loss of the muffler..So ...

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Old 03-02-2006, 05:22 PM   #1
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Canada No Muffler = Bad Gas Milage!!

Ya my 2.4L with no muffler has noticably been sucking back way more fuel with the loss of the muffler..So if U dont mind spending a bit more on gas and enjoy the sound..do it,but if your tight on cash.. leave it on (the muffler).. I noticed a gain of close to 3Litres per 100km's of fuel useage ..and it being winter here now, I have been drive conservativly!!
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Old 03-02-2006, 05:34 PM   #2
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Why would you take your muffler off in teh first place? isnt it illegal lol
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Old 03-02-2006, 05:53 PM   #3
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when i got my exhaust i notices a fuel mileage increase
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Old 03-03-2006, 12:16 AM   #4
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Quote:
Originally Posted by celicacobalt
when i got my exhaust i notices a fuel mileage increase
Yeah, your fuel mileage should actually increase with no muffler. Less restriction on the exhaust means less effort put out by the engine.

Are you sure your not driving the car harder to hear your exhaust more often?
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Old 03-03-2006, 05:52 PM   #5
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Ya I know it sounds wierd but its the truth, but no muffler= bad gas milage in my part of the world! And no muffler sounds great, but muffler on now I can here myself think to,lol..When summer ever comes back I'll put the muffler on again!
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Old 03-23-2006, 05:11 PM   #6
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WTF !!! Just checked out your videos and I must say it sounds like total ****. Kinda sounds like a chain saw/weed eater/fart can combo Why would you do this to a new domestic car ???
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Old 03-23-2006, 05:14 PM   #7
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because he wants it to sound COOL.. in cool I mean GAY
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Old 03-23-2006, 05:21 PM   #8
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Quote:
Originally Posted by R33P3R007
because he wants it to sound COOL.. in cool I mean GAY
Yeah wtf would you take your muffler off for?????
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Old 03-23-2006, 05:26 PM   #9
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Old 03-23-2006, 05:27 PM   #10
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Quote:
Originally Posted by Dragon007
Ya I know it sounds wierd but its the truth, but no muffler= bad gas milage in my part of the world! And no muffler sounds great, but muffler on now I can here myself think to,lol..When summer ever comes back I'll put the muffler on again!
man having no muffler is crazy it makes a brand new car with so much potential sound like ****. sorry to disrespect you but take a look at the people around your car when you are driving around... you are going to catch alot of people laughing (no offense man)
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Old 03-24-2006, 06:04 PM   #11
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Old 04-09-2006, 04:23 PM   #12
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wtf is wrong with you. The car now has little back pressure you moron you will shorten the life of your engine. I think i just got dumber by reading this. I bet you he also has a dryer vent for an intake and took a hack saw to the coils
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Old 04-09-2006, 05:30 PM   #13
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Dont give him anymore ideas.... LoL
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Old 04-09-2006, 07:09 PM   #14
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Quote:
Originally Posted by yel06gt
wtf is wrong with you. The car now has little back pressure you moron you will shorten the life of your engine. I think i just got dumber by reading this. I bet you he also has a dryer vent for an intake and took a hack saw to the coils

Omg, backpressure shortens the life of a motor. Thats the funniest thing i've ever heard, i would seriously bitchslap you if i saw you...just end yourself now!
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Old 04-09-2006, 07:12 PM   #15
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Quote:
Originally Posted by yel06gt
wtf is wrong with you. The car now has little back pressure you moron you will shorten the life of your engine. I think i just got dumber by reading this. I bet you he also has a dryer vent for an intake and took a hack saw to the coils
I think the damage was done before considering the comment you left. Back pressure has nothing to do with anything at all to begin with. And saying it hurts the motor is even funnier.
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Old 04-09-2006, 07:15 PM   #16
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Put A Catback Or Something
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Old 04-10-2006, 01:45 AM   #17
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gas mileage goes down in the winter
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Old 04-10-2006, 01:48 AM   #18
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Quote:
Originally Posted by giovanhalen
gas mileage goes down in the winter
I would like to hear the reasoning behind this....
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Old 04-10-2006, 01:57 AM   #19
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someone post a link to his vids. cuz id like to hear them. thanks
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Old 04-10-2006, 03:28 AM   #20
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Quote:
Originally Posted by 280Z1977
I would like to hear the reasoning behind this....
In cold weather, our vehicles take a much longer period of time to reach full operating temperature. And they take this extra time each and every time we start them up, even if they have not fully cooled down.

Modern engine-management systems are very efficient at optimizing the fuel/air ratio entering the engine. The oxygen sensor monitors the percentage of oxygen in the exhaust, compares this with the percentage of oxygen in the atmosphere, and generates a low-voltage signal that communicates this ratio to the computer. The computer then adjusts the pulse-width of the fuel injectors -- the precise period of time each injector is open on each injection cycle --to fine-tune the amount of fuel reaching each cylinder.

The system makes this very fine adjustment dozens of times each second, working very hard to reach the optimum air/fuel ratio for any given situation, and at steady-state cruise speed seeks to approach the perfect ratio of 14.7 to 1, called the stoichometric ratio. The system is running in a "closed loop" when it is relying upon the oxygen-sensor signal to fine-tune engine operation.

But the engine-management system can seek this optimum air/fuel ratio only when the engine is up to full temperature. In fact, the computer does not look for a signal from the oxygen sensor until it approaches full temperature. During the warm-up cycle -- which takes considerably longer in cold weather -- the computer operates on a warm-up program based on coolant temperature, mass airflow or MAP sensor input of air volume and temperature, throttle position and engine rpm. This is called "open loop" operation, meaning the system is not operating off the feedback from the oxygen sensor.

In open-loop operation during the warm-up period, the engine requires -- and is provided with -- a richer air/fuel ratio to ensure good combustion.

It needs this extra fuel for the simple reason that a percentage of the atomized, then vaporized, fuel delivered to the engine condenses into liquid gasoline on cold internal engine components such as the intake manifold, intake valves, pistons and cylinder. And remember, it's gasoline vapor, not liquid, that burns.

Until those parts warm up, the engine needs more fuel to operate with reasonable drivability. Thus, the colder the weather, the longer it takes for your engine to reach full operating temperature and closed-loop operation, and thus the more fuel the engine uses to deliver the same driving cycle. That's the primary reason your engine consumes more fuel in winter driving.

Another factor in winter mileage is air density, defined as the number of air molecules per cubic foot of air entering the engine. Remember that 14.7-1 air/fuel ratio? That means 14.7 parts of air are mixed with one part of fuel for the perfect air/fuel ratio -- that's a lot of air!

In winter, colder air means denser air -- more molecules per cubic foot. At any specific throttle setting or opening, the same number of cubic feet of air, but containing more air molecules, will enter the engine. The computer will provide more fuel to create the proper air/fuel ratio at that moment. This is a bit more subtle, since "more air/more fuel" produces more power, so you may be able to operate at a slightly lower throttle setting -- sort of rebalancing the equation.
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Old 04-10-2006, 03:45 AM   #21
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Quote:
Originally Posted by Cobalt30
someone post a link to his vids. cuz id like to hear them. thanks
I think it sounds fine. Although from a video it's hard to tell.

http://videos.streetfire.net/search/...E8B1791A08.htm
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Old 04-10-2006, 04:47 AM   #22
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thanks man. i dont think it sounds too bad



1000 post i believe
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Old 04-11-2006, 12:48 AM   #23
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reasoning

Quote:
Originally Posted by 280Z1977
I would like to hear the reasoning behind this....
Don't need to reason a fact! But if you want me to guess, the engine oil and other lubricants are cold ant therefore thicker making the transmission and oil pump harder to turn which takes more power=more fuel. Fuel may not atomize as well when the engine is cold.
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Old 04-11-2006, 01:20 AM   #24
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I don't think it sounds bad..i think that all the exhausts sound like pissed off chainsaws...they are all chevy fo bangas for crying out loud!!!!!! It's not going to sound like a mean @$$ 8 cylinder waiting to eat the world up!!!!! Take it for what it is...no reason to rip into someone for wanting their car to sound meaner or I guess louder in this case!!!!!
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Old 04-11-2006, 01:28 AM   #25
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Seems as it is loud, but get a cat-back you will be much happier in the long run...
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Old 04-11-2006, 01:28 AM
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