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Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons Bolt-Ons | Intakes | Exhaust

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Old 11-17-2010, 11:18 PM   #1
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Muffler delete mpg + or -?

Yep! the title pretty much says it. I haven't see any threads specifying the gas mileage benefits of muffler deletes (doubt there is). I just recently got muffler deletes and I've noticed a slight decrease from 65 to 70mph. I run my car only on supreme and I grandma my car most of the time. Has anyone noticed any changes on the LS3? Thx!
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Old 11-18-2010, 12:52 AM   #2
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i think you lose a little MPG, because loss of back pressure
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Old 11-18-2010, 04:44 AM   #3
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back pressure is in the cats and res mufflers do nothing more than dampen sound

if you look on here you'll find a cut a way of a muffler and it is just a strait pipe with a hole in it

heres thread www.camaro5.com/forums/showthread.php?t=57512

i didnt notice any loss in mpg other than constant reving to hear awsome
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Old 11-18-2010, 04:54 AM   #4
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you get god MPG when you have good low end power.. i have heard multiple time on allot of forums, they feel a little loss in low end TQ, but gain high end.. my friend with a 5.0L mustang did a muffler delete and he is always talking about his MPG loss

do some research on it , or get some professional advice
good luck
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Old 11-18-2010, 07:54 AM   #5
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it's because you get on it more to hear the better sound. I know you think you don't but trust me it happens to all of us.
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Old 11-18-2010, 08:22 AM   #6
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I have a couple friends that did muffler delete on their cars and both complain about loss of mpg. I have also heard its due to the loss of back pressure.
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Old 11-18-2010, 09:35 AM   #7
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I did the deletes and i have a bit better MPg. About 1 or 2 Mpg. u deff lose mpg's when u do the deletes because of all constant reving.

i also lost a minimal low end torque but gained a minimal high end torque along with rpm movement.
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Old 11-18-2010, 10:46 AM   #8
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Quote:
Originally Posted by CamaroCowboy View Post
it's because you get on it more to hear the better sound. I know you think you don't but trust me it happens to all of us.
you have a point but I think the sound actually helps me save gas. I dont drive a camaro so I dont have any numbers to compare but I did swap out the mufflers on my lexus... need I say more
Anyhow, apart from the occasional 0-65 test on the on ramps I grandma it around town. I have found that the louder exhaust note makes me much more conscious of what RPM I am at and how hard (or easy) I am pushing the engine, making it easier to save some $$$ on gas
IMO
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Old 11-18-2010, 11:22 AM   #9
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Did anyone buy their Camaro for the gas mileage? I did not.

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Old 11-18-2010, 11:22 AM   #10
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Quote:
Originally Posted by mikeSS View Post
i think you lose a little MPG, because loss of back pressure
I think you should just not post anything tech related, ever. For the record these cars don't have two stroke carbed weed wacker engines.

Overly-open exhausts can cause a loss of exhaust velocity which will hamper the vacuum scavenging effect of the exhaust pulses pulling/emptying spent cylinders, but you'd need something absurdly large like 4" true duals with 2.5" tube headers to even come remotely close to hampering yourself, and it is NEVER going to occur as far back as the mufflers.

Backpressure? ALWAYS a bad thing, because it is nothing but a flow (hp) restriction.
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Old 11-18-2010, 11:25 AM   #11
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After my muffler delete my avg mpg went down by about 4 or 5 mpg..... Mainly cuz I love the sound and rev it up all the time!
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Old 11-18-2010, 11:26 AM   #12
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Did anyone buy their Camaro for the gas mileage? I did not.

Bill
I actually did! Was getting 17 MPG in my 2006 Nissan Xterra... getting 20+ a tank with my 2SS!
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Old 11-18-2010, 11:41 AM   #13
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I get 27-29 mpg hwy and 17-20 mpg city on mine.

I dnt thnk u lose MPG wit muffler delete.
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Old 11-18-2010, 12:21 PM   #14
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Quote:
Originally Posted by Ovenmitt View Post
I think you should just not post anything tech related, ever. For the record these cars don't have two stroke carbed weed wacker engines.

Overly-open exhausts can cause a loss of exhaust velocity which will hamper the vacuum scavenging effect of the exhaust pulses pulling/emptying spent cylinders, but you'd need something absurdly large like 4" true duals with 2.5" tube headers to even come remotely close to hampering yourself, and it is NEVER going to occur as far back as the mufflers.

Backpressure? ALWAYS a bad thing, because it is nothing but a flow (hp) restriction.
well allot of people say other wise
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Old 11-18-2010, 12:35 PM   #15
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Back pressure is needed for 4 cylinders and or with turbo applications. The big ol mufflers where added by GM so everyone even picky people that dont like it loud would buy it. GM offers an upgraded cat back muffler exhaust, which is straight thru itself. I wouldn't see these cars needing back pressure, unless you did turbo them.
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Old 11-18-2010, 04:35 PM   #16
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I agree, who buys a camaro SS for the gas mileage
I did the muffler delete and did not notice a difference at all. Even if there was, I would imagine you would maybe lose $2/ fill up. However, I did notice my gas mileage go up once I got the CAI. I think the mods balanced each other out
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Old 11-18-2010, 04:40 PM   #17
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I agree, who buys a camaro SS for the gas mileage
I did the muffler delete and did not notice a difference at all. Even if there was, I would imagine you would maybe lose $2/ fill up. However, I did notice my gas mileage go up once I got the CAI. I think the mods balanced each other out
yes its a very small loss, but i agree i didn't buy the camaro for MPG.. any one who buys a 6.2L v8 engine should not be complaining about MPG lol
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Old 11-18-2010, 05:29 PM   #18
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lol gas mileage and camaro SS in the same sentence is funny. After my muffler delete I know I lost mpg cause I like revving it now.
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Old 11-18-2010, 06:02 PM   #19
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lol gas mileage and camaro SS in the same sentence is funny. After my muffler delete I know I lost mpg cause I like revving it now.
ya i know what you mean, once i got my exhaust work done, i realized i drive it different, when i was rocking stock exhaust for about 2k miles i never really reved it or anything lol , i drove it fast but no reving, now i ride the gears longer sometimes for fun
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Old 11-18-2010, 11:01 PM   #20
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I chose a new SS 'cause its fast (yeah I know!), No kissing a window when suddenly turning (referring to trucks), and simply because.. its an everyday joy to drive. EVERYDAY! A big nasty 6.2L! "Oh yeah!" thats Kool-aid style. I knew the gas mileage was going to be better highway-wise compared to my 1991 5.3l z71. Good gasemileage should never be considered in city-driving. I haven't noticed any losses in mpg up to about 70mph. Then I can only hit 23.1 or .4 I believe.
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Old 11-21-2010, 07:11 AM   #21
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I deleted my mufflers 1 week ago, and I think I lost (maybe) 1-3 MPG. 3 days later, I added a K&N panel filter and it seems to have gone back up to where it was originally, if not a little bit higher (when I baby it).

The problem is (like everyone else) I get on it alot now to hear the awesomeness coming out of the exhaust!

The K&N panel filter made a huge difference to the overall throttle response of the engine IMO.
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Old 11-21-2010, 09:17 AM   #22
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I have the muffler delete and didn't notice any difference. I don't baby it either. She averaged 16.7 mpg in the city when I parked her for the winter.
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Old 11-21-2010, 11:14 AM   #23
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A little off topic, but does anyone know how accurate the MPG reader is? I can remember one time when I reset it before I left for the day, and when I parked at school I was getting 16.8. Then when I got back to my car a few hours later and started it up, it read 15.0...
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