DODGE RAM FORUM - Ram Forums and Owners Club! - Dodge Truck Forum

Go Back   DODGE RAM FORUM - Ram Forums and Owners Club! - Dodge Truck Forum > Dodge Ram Forum - Mod Zone - Custom Dodge Ram Mods - Dodge Ram Performance > Custom Dodge Ram Performance Mods - Engine - 5.7 HEMI V8


Notices

Custom Dodge Ram Performance Mods - Engine - 5.7 HEMI V8 Discuss modifying your Dodge Ram with Performance Parts and Accessories!
Factory Spec: 5.7-liter HEMI® V8 engine - 390 horsepower, 407 lb-ft of torque.


Latest Vendor News
AutoAnything
Addictive Desert Designs!
United Radio
Bayou Goat Mounts

Reply
 
Thread Tools
  #1  
Old 07-28-2012, 01:38 PM
BadHazard's Avatar
BadHazard BadHazard is offline
Dodge Ram Forum Senior Member!
 
Join Date: Sep 2011
Location: Montana
Age: 27
Posts: 205
Gender: Male
Vehicle: 2006 QCSB, 1500
Trim Level: Laramie
Color: Inferno Red
Engine: 2003-2008 345ci (5.7L) Hemi V8 345hp 375lb/ft
Rep Power: 0
Rep:10
BadHazard is on a distinguished road
Default Installed a magnaflow now loss of mpg

I had a 3" straight pipe on, had to put a muffler on, bought a magnaflow straight through. I was getting a hand calculated 15 mpg before the muffler, now I barely brake 13. Its been on for about a year. Before the install my lie-o-meter was at 17 to 18, even that has dropped. Nothing else has changed.

Can a bad egr valve be a problem? Or isnt there another thing similar to that, that can cause mpg drop?
__________________
06 QCSB, 1500, Laramie, 4x4 50k. 18" Rockstars, K&N Drop in Filter, Muffler Delete, SuperChip
Reply With Quote
Sponsored links
  #2  
Old 07-28-2012, 03:18 PM
RcsbHemi's Avatar
RcsbHemi RcsbHemi is offline
Dodge Ram Forum Senior Member!
 
Join Date: May 2010
Location: NY
Age: 32
Posts: 189
Gender: Male
Vehicle: 2010 Ram Rcsb
Trim Level: SLT 4x4 3.92
Color: PDM Metallic Gray
Engine: 2009-20?? 345ci (5.7L) Hemi V8 390hp 407lb/ft
Rep Power: 0
Rep:32
RcsbHemi is on a distinguished road
Default

Have your driving habits changed after installing the muffler? I ask because my MPG went down also but I blame myself because I always want to hear my exhaust, especially under acceleration.
__________________

Mods: Magnaflow DOD14(resonator removed) line-x, tint, silverstars, tonno pro trifold tonneau, LED Licence plate and reverse bulbs, 2- 27w led fog lights behind grille. more to come........
Reply With Quote
  #3  
Old 07-28-2012, 09:57 PM
HEMI450HP HEMI450HP is offline
Banned
 
Join Date: Mar 2012
Location: Conroe, TX
Posts: 245
Gender: Male
Vehicle: 2010 Dodge Ram 2500
Color: Silver
Engine: 2007-2011 409ci (6.7L) Cummins Turbo Diesel 350hp 650lb/ft
Rep Power: 0
Rep:69
HEMI450HP will become famous soon enough
Default

Running without a muffler is going to give more power and better mileage, so I would expect to lose mileage reguardless of which muffler you added.
Reply With Quote
  #4  
Old 07-31-2012, 02:09 PM
BlackHemI's Avatar
BlackHemI BlackHemI is offline
Dodge Ram Forum Senior Member!
 
Join Date: Jun 2011
Location: Houston
Age: 24
Posts: 2,961
Gender: Male
Vehicle: 2008 Ram Hemi
Trim Level: Lonestar
Color: Black
Engine: 2003-2008 345ci (5.7L) Hemi V8 345hp 375lb/ft
Rep Power: 5
Rep:296
BlackHemI is a jewel in the roughBlackHemI is a jewel in the roughBlackHemI is a jewel in the rough
Default

weird...i had no muffler and went down to 11.5-12.5 mpg. with my maggy it is 12.5-14 and this is hand calculated...i find it hard to believe you get 15 with your 4x4!!
__________________
-Pat-
14" magnaflow with custom magna y-pipe, 8k heads and fogs, hella FF 500's, 5% tint all the way, 60" LED brake light, Smoked tails and 3rd, Ballistic Jesters in 275/55/20 zeon ltz, color matched handles/mirrors, painted calipers, L.E.D interior, debadged & Viper 5901, 180 t-stat
Reply With Quote
  #5  
Old 07-31-2012, 03:54 PM
crusher crusher is offline
Dodge Ram Forum Senior Member!
 
Join Date: Oct 2009
Location: quebec canada
Age: 31
Posts: 2,243
Gender: Male
Vehicle: 2014 ram sport crewcab rambox
Color: black
Engine: 2009-20?? 345ci (5.7L) Hemi V8 390hp 407lb/ft
Rep Power: 7
Rep:357
crusher is just really nicecrusher is just really nicecrusher is just really nicecrusher is just really nice
Default

i would say you have a foot problem thats related to your hears, we all had that problem with the mufflex,.. but if your sure thats not the probleme, did you change your plugs, clean air filter and or replace it and perform a tune to your truck lattely??
__________________
2014 ram sport crew cab with ram box,side steps,sport hood,remote starter,8 speed &3.92 gear lsd,4 corner air susp,knn intake,mufflex 18, BT catchcan,bakflip F1 cover
Reply With Quote
  #6  
Old 08-02-2012, 02:02 AM
S.C. Express S.C. Express is offline
Dodge Ram Forum Senior Member!
 
Join Date: Jul 2012
Location: North Augusta S.C.
Age: 39
Posts: 1,017
Gender: Male
Vehicle: 2012 Ram Express
Trim Level: Express
Color: Silver
Engine: 2009-20?? 345ci (5.7L) Hemi V8 390hp 407lb/ft
Rep Power: 0
Rep:63
S.C. Express will become famous soon enough
Default

Checked tire pressure lately, and did you factor in the weather lately? I don't know about Montana's climate, but it's hot and humid as hell out here. There is an easy 1-2mpg difference from driving in hot weather vs. cooler weather. I paid close attention to my mpg's on a long trip I took recently. Mid 80F degree weather gave me much better mpg's than 90+F weather.
__________________
Jones MaxFlow 18" muffler swap, Green Performance drop in air filter..
Reply With Quote
  #7  
Old 09-23-2012, 07:15 PM
70x7's Avatar
70x7 70x7 is offline
Dodge Ram Forum Senior Member!
 
Join Date: Jun 2012
Location: Albuq, NM
Posts: 113
Gender: Male
Vehicle: 2008 QC HEMI
Trim Level: Big Horn
Color: Silver
Engine: 2003-2008 345ci (5.7L) Hemi V8 345hp 375lb/ft
Rep Power: 0
Rep:34
70x7 is on a distinguished road
Default

Same thing happened with my muffler swap.
I attributed the first couple fillups to the foot pedal cause of the sound, but the mpg calculation has consistently shown about 1- 1.5mpg drop and its not cause of the sound anymore since I have purposely let off on the throttle more.
Was getting about 15.5 before and now it hits 14 or just a tad over...
__________________
2008 1500 QC HEMI--
Spectre Intake*Flopro Max Muffler*Superchips Cortex*Bilstien 5100*Pioneer AVH-X7500BT*Magnaflow Ypipe*Viper Alarm*85mm Throttle Body
Reply With Quote
  #8  
Old 09-23-2012, 09:54 PM
moparornocar72's Avatar
moparornocar72 moparornocar72 is offline
Dodge Ram Forum Member

 
Join Date: Aug 2010
Location: Auburn, AL
Age: 26
Posts: 3,666
Gender: Male
Vehicle: 2010 Dodge Ram
Trim Level: Big Horn
Color: Mineral Grey
Engine: 2009-20?? 345ci (5.7L) Hemi V8 390hp 407lb/ft
Rep Power: 7
Rep:630
moparornocar72 is a name known to allmoparornocar72 is a name known to allmoparornocar72 is a name known to allmoparornocar72 is a name known to allmoparornocar72 is a name known to allmoparornocar72 is a name known to all
Default

I would run some cleaner through the top end such as seafoam or bg branded intake cleaner. But as mentioned anytime u go from no muffler to muffler ur going to lose mpg
__________________
14.268 @ 95 MPH Full Trim

Proudly Sponsored by Bully's Performance
Reply With Quote
Reply

Bookmarks

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


Advertisement






All times are GMT -4. The time now is 12:00 AM.


= Copyright RamForumZ.com a Gigathreads.com Network Site =Ad Management by RedTyger
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
vB.Sponsors


=Gigathreads Network=
CLUBS MOPAR NATION DSM GPMM MAMM JAM
DIESEL Diesel Forum      
CHEVY Chevy Camaro Forum Chevy Volt Forum    
CHRYSLER Chrysler 300C Forum      
DODGE Dodge Avenger Forum Dodge Caliber Forum Dodge Challenger Forum Dodge Charger Forum
  Dodge Circuit Forum Dodge Hornet Forum Dodge Magnum Forum Dodge Nitro Forum
  Dodge Ram Forum Dodge Dakota Forum Dodge Durango Forum Dodge Dart Forum
FORD Ford Raptor Forum Ford F150 Forum Ford F100 Forum  
JEEP Jeep Forum      
PONTIAC Pontiac G8 Forum      
SRT SRT Viper Forum SRT Cuda Forum