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Old 04-05-2006, 06:38 PM   #1
slv01sc2
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Default Exhaust resonator and MPG

I have been driving my 01 Saturn SC2 with a cracked exhaust resonator for about 3,000 miles now. I finally have saved enough money to get it fixed. I have an appointment this Friday $300 at Saturn. Anyway my car has been getting the best gas mileage that it's ever gotten in all of its 87,000 miles. For the last 6 fill ups Ive gotten 32MPG for all city driving. Could this cracked exhaust resonator be the reason for my terrific mileage? Another question is my car under the hood the plastic air intake(I don't know what this is called) right up on the front where it say"Saturn Power Module" is very loose. What is this piece and could this be causing some wierd lound droning noises coming from under my hood under hard acceleration?

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Old 04-05-2006, 11:48 PM   #2
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Default Re: Exhaust resonator and MPG

the plastic thing in the front is the intake routing. this is where your car gets air from. dunno about the whole noise thing, though. as far as your resonator goes, i have never found a reason for one, its an emissions thing. you are probably getting better mileage because it is getting warmer outside.

if i were you, i would ask a certified emissions mechanic if you need the resonator on your car at all to pass emissions testing. if not, i would have them cut it off and weld in a piece of exhaust pipe. easier and cheaper. i doubt if it will have any bearing on emissions testing, but it is different in every state. some states dont even have emissions. i live in NC and emissions tests are ran on 1996 and newer cars. check it out and see what you can get away with. a little research is worth $300, to me at least. hope this helps!

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Old 04-06-2006, 12:23 AM   #3
98greenSC2
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Default Re: Exhaust resonator and MPG

Threadjack???

I noticed my mileage has improved as the weather gets warmer. Today, I went to College Station and back. It was sunny and in the 80's. I topped off before leaving and right after coming back. I got 35.4mpg. Not too bad coinsidering there's some city driving mixed in and flooring it to pass slowpokes on a 2-lane highway.

Maybe one reason your mileage is up is because the cracked resonator may be helping reduce exhaust backpressure. That's why a car with a performance cat-back exhaust will gain power and rarely lose much, if any, fuel economy.

If that intake piece is the plastic jug thing that sits in the middle over the fan shroud, that's the intake resonator. It's supposed to quiet down intake noise and that could cause that droning under acceleration. Personally, I like the intake noise. It sounds so sweet with my AEM cold air intake.

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Last edited by 98greenSC2; 04-06-2006 at 12:30 AM..

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Old 04-06-2006, 12:58 AM   #4
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Default Re: Exhaust resonator and MPG

Quote:
Originally Posted by 98greenSC2
Threadjack???

I noticed my mileage has improved as the weather gets warmer. Today, I went to College Station and back. It was sunny and in the 80's. I topped off before leaving and right after coming back. I got 35.4mpg. Not too bad coinsidering there's some city driving mixed in and flooring it to pass slowpokes on a 2-lane highway.
Brings back fond memories of HWY290 between Houston and College Station (partying with the Aggies were you?)

Reduced exhaust back pressure can result in better MPG, especially if your cat is getting clogged up. It may however just be due to a switch to "summer" gas. (Happens earlier in the south) The "loose" box is the resonator. It does not need to be "tight". It does not really "need" to be there at all. It just mellows the sound of the engine's air intake system.

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Old 04-06-2006, 01:09 AM   #5
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Default Re: Exhaust resonator and MPG

Quote:
Originally Posted by wolfman
Brings back fond memories of HWY290 between Houston and College Station (partying with the Aggies were you?)
Nah, I was pawn shopping. I buy guitars and resell them on eBay for profit. That paid for half of the Saturn and all of the Eclipse! I also hit up Conroe on the way there so I never got on HWY 290. I took SH 105 to Navasota then up SH 6 to College Station. Two lane highways try my nerves. You can go only as fast as the slowest person (there WILL be someone). Throw in some hills and curves and there's nowhere to pass! At least some people move onto the shoulder to let people by. That must be a Texas thing. For the record, I set the cruise to 75 on SH 6 and, if I'm lucky, on SH 105.

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Old 04-06-2006, 08:36 AM   #6
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Default Re: Exhaust resonator and MPG

$300?

Wow, that's exspensive.


The entire 3inch exhaust for my GLH is less than that, I love a friend who can weld.

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Old 04-06-2006, 08:48 AM   #7
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Default Re: Exhaust resonator and MPG

Yeah, my whole custom exhaust cost me less than $300 and that's including bending and installation. Just get an equivalent aftermarket resonator or delete it completely and go to a muffler shop. You'll save some $$$.

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Old 04-06-2006, 11:41 AM   #8
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Default Re: Exhaust resonator and MPG

Thanks so much for all of the replies. I guess that I could just leave it the way it is right now. The car does sound a little louder than usual. Could the switch from winter to summer make that much of a difference?

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Old 04-06-2006, 12:13 PM   #9
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Default Re: Exhaust resonator and MPG

from what many people on this site says ,yes.

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Old 04-06-2006, 04:29 PM   #10
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Default Re: Exhaust resonator and MPG

Well I went to Midas and they gave me two options. The first is for $186 to install a new universal resonator. Will this work as well on my car as the genuine Saturn part from the dealer, or cause any complications? Option 2 would be to remove the resonator and run a straight pipe which would be even cheaper. How much louder would my car sound if I just ran the straight pipe? Would this do anything to my emissions or trigger a SES light? Please comment because I'm scheduled tomorrow morning at Saturn.

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Old 04-06-2006, 08:27 PM   #11
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Default Re: Exhaust resonator and MPG

Just run a universal resonator.

Anything AFTER (except the o2 sensor)the catalytic convertor willl not affect emission or set SES light off.

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