Go Back   EcoModder Forum > EcoModding > EcoModding Central
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 01-17-2017, 05:01 AM   #1 (permalink)
EcoModding Lurker
 
Join Date: Aug 2016
Location: Alabama
Posts: 48
Thanks: 27
Thanked 2 Times in 2 Posts
Muffler delete helps mpg?

Dear JettaD is now at 235,6xx miles and has been my daily driver since the end of October. Have been reliably been getting 36-38 mpg per tank. From the get go I had a full upper grill block (with a cutout for the air intake port there) and approx 40% lower block, aluminum skid plate (Plate rides approx 3in above the pavement), tires at sidewall pressure (44psi), raodo antenna relocated to inside rear frame between rear pass window and rear window, and a home made CCV filter.

Planning to install a coroplast and/or sheet metal belly pan, get thinner tires that are also LRR rated (mine are almost to the wear marks), get a set of bosio sprint 520 injector nozzles, and an ECU tune from somewhere (Malone maybe? Site says he can do VW TDI specific tunes).

My question is this. Last Thursday I chopped off my muffler and almost immediately my UG started showing an avg mpg of 48-50 instead of my usual 36-38. Have not conciously made changes to my driving style since then and have not made any other changes, still fill up at the same pump from the same station every time. Is this a possible gain from the muffler delete? Or did I do something else incidentally? Anyone have similar experiences with a muffler delete?

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 01-17-2017, 06:09 AM   #2 (permalink)
Master EcoModder
 
oldtamiyaphile's Avatar
 
Join Date: May 2009
Location: Australia
Posts: 1,510

UFI - '12 Fiat 500 Twinair
Team Turbocharged!
90 day: 40.3 mpg (US)

Jeep - '05 Jeep Wrangler Renegade
90 day: 18.09 mpg (US)

R32 - '89 Nissan Skyline

STiG - '16 Renault Trafic 140dCi Energy
90 day: 30.12 mpg (US)

Prius - '05 Toyota Prius
Team Toyota
90 day: 50.25 mpg (US)

Premodded - '49 Ford Freighter
90 day: 13.48 mpg (US)

F-117 - '10 Proton Arena GLSi
Pickups
Mitsubishi
90 day: 37.82 mpg (US)

Ralica - '85 Toyota Celica ST
90 day: 25.23 mpg (US)

Sx4 - '07 Suzuki Sx4
90 day: 32.21 mpg (US)

F-117 (2) - '03 Citroen Xsara VTS
90 day: 30.06 mpg (US)
Thanks: 325
Thanked 452 Times in 319 Posts
I think muffler deletes can pay off in diesels, but keep in mind that any mod probably means you need to recalibrate the UG.

All OBD gauges are pretty much guess-o-meters anyway and especially on diesels.
__________________






  Reply With Quote
Old 01-17-2017, 10:21 AM   #3 (permalink)
Corporate imperialist
 
oil pan 4's Avatar
 
Join Date: Jul 2011
Location: NewMexico (USA)
Posts: 11,175

Sub - '84 Chevy Diesel Suburban C10
SUV
90 day: 19.5 mpg (US)

camaro - '85 Chevy Camaro Z28

Riot - '03 Kia Rio POS
Team Hyundai
90 day: 30.21 mpg (US)

Bug - '01 VW Beetle GLSturbo
90 day: 26.43 mpg (US)

Sub2500 - '86 GMC Suburban C2500
90 day: 11.95 mpg (US)

Snow flake - '11 Nissan Leaf SL
SUV
90 day: 141.63 mpg (US)
Thanks: 269
Thanked 3,522 Times in 2,796 Posts
Yeah it could help. Less back pressure on the turbo will force more air into the engine giving better MPG.
But only on a diesel.
__________________
1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
  Reply With Quote
Old 01-17-2017, 01:09 PM   #4 (permalink)
Master EcoWalker
 
RedDevil's Avatar
 
Join Date: Dec 2012
Location: Nieuwegein, the Netherlands
Posts: 3,998

Red Devil - '11 Honda Insight Elegance
Team Honda
90 day: 47.72 mpg (US)
Thanks: 1,711
Thanked 2,245 Times in 1,454 Posts
Was the muffler clogged?
It could not have had so much effect if not?

__________________
2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
lifetime FE over 0.2 Gmeter or 0.13 Mmile.


For confirmation go to people just like you.
For education go to people unlike yourself.
  Reply With Quote
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com