Muffler delete mpg + or -? - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Etherij · 11-17-2010, 11:18 PM

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!

mikeSS · 11-18-2010, 12:52 AM

i think you lose a little MPG, because loss of back pressure

destroyerofu2 · 11-18-2010, 04:44 AM

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

mikeSS · 11-18-2010, 04:54 AM

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

CamaroCowboy · 11-18-2010, 07:54 AM

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.

96/10SS · 11-18-2010, 08:22 AM

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.

XPUPUSTAINSX · 11-18-2010, 09:35 AM

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.

Dalefj · 11-18-2010, 10:46 AM

Quote:

Originally Posted by CamaroCowboy

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

BowlingSS · 11-18-2010, 11:22 AM

Did anyone buy their Camaro for the gas mileage? I did not.

Bill

Ovenmitt · 11-18-2010, 11:22 AM

Quote:

Originally Posted by mikeSS

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.

Rage · 11-18-2010, 11:25 AM

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!

BSX_Camaro · 11-18-2010, 11:26 AM

Quote:

Originally Posted by BowlingSS

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!

GEEo · 11-18-2010, 11:41 AM

I get 27-29 mpg hwy and 17-20 mpg city on mine.

I dnt thnk u lose MPG wit muffler delete.

mikeSS · 11-18-2010, 12:21 PM

Quote:

Originally Posted by Ovenmitt

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

11-17-2010, 11:18 PM	#1
Etherij Drives: 2010 Camaro 1SS LS3 Join Date: Jun 2010 Location: V-Town, Tx Posts: 372	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! __________________ *TEAM LS3!* Mods so far: JBA Catted mid-pipes Flowmaster AMT

11-18-2010, 07:54 AM	#5
CamaroCowboy Drives: 2013 Chevy Truck Join Date: Mar 2010 Location: Copperas Cove, Texas Posts: 1,782 View My Garage	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. __________________ Texas speed LT Headers and High Flow Cats, Magnaflow 3 inch cat-back Exhaust, SNL V2 Comp CAM, Texas Speed Underdrive Pully, G5CR CAI, Hurst Short Throw Shifter, JetFlo Mass Air Sensor, Custom Grill, Amber AAC Headlight and Fog Light Halo, Amber footwell Lighting, Amber under hood lighting, RK Sport Ram Air /Heat Extractor Hood and ADM Racing Scoop. 447.9 RWHP 428 TQ My car is exactly that, No one has to like it but me!

11-18-2010, 09:35 AM	#7
XPUPUSTAINSX Drives: 2010 Camaro 2SS Transformer Join Date: Sep 2009 Location: Miami, Fl. Posts: 102 View My Garage	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. __________________ Order# NPFGFC Delivered on: 12/15/09 2SS/RS Rally Yellow, Automatic, GFX, Transformers Edition.

11-18-2010, 11:22 AM	#9
BowlingSS Camaro Owner Since 1987 Drives: 2011 2SS/RS L99 RJT Join Date: Jun 2006 Location: Lawrenceville, GA Posts: 2,185	Did anyone buy their Camaro for the gas mileage? I did not. Bill __________________ 2011 Camaro 2SS/RS L99 RJT CAI, Inc. Cold Air Induction;ADM Scoop Rx Catch Can;Rx Breather;Roto-Fab Washer Container VMax Ported RJT Throttle Body XSPower Headers and XSPower 3" Exhaust System Elite Engineering Tunnel Brace, Gorilla Wheel Lock System; Bear Rotors, Hawk HPS Tinted Windows 35%;EFILive Tune

11-18-2010, 11:25 AM	#11
Rage TRI-COUNTY CAMARO... FTW! Drives: 2010 Camaro 2SS M6 Cyber Grey Join Date: May 2010 Location: South Florida Posts: 1,200 View My Garage	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! __________________ CAI inc. cold air intake, LG G6x3 cam, Patriot Gold Extreme Dual springs, Titanium retainers and locks, LG SuperPro 1 7/8 Long Tube headers with full 3" exhaust, DynoMax VT mufflers, SLP 4" tips, Moroso catch can, Race Ready electronic exhaust cut outs, Full painted Razzi body kit, Headlight Armor Smoke taillight and marker blackouts, T-Rex aluminum upper and lower grille, Polished aluminum front and rear bowties. Professionally installed and Dyno Tuned by HorsePower Sales, Pompano Beach FL.

11-18-2010, 12:52 AM	#2
mikeSS Drives: 2015 c7 Join Date: Nov 2009 Location: MI Posts: 7,462	i think you lose a little MPG, because loss of back pressure

11-18-2010, 04:54 AM	#4
mikeSS Drives: 2015 c7 Join Date: Nov 2009 Location: MI Posts: 7,462	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

11-18-2010, 08:22 AM	#6
96/10SS Drives: 2010 2SS Orange w/ Grey stripes Join Date: Jul 2010 Location: SFL Posts: 372	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.

11-18-2010, 11:41 AM	#13
GEEo OKCamaros Drives: 4 banger Diesel Join Date: Mar 2010 Location: Philippines Posts: 4,572	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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