HP/TQ gains from just removing DPF and MBRP 4" - Page 2

lddrew · 12-25-2012, 12:55 AM

He probably also tuned it. They were giving stock tunes with dpf turned off mileage

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bb_max · 12-26-2012, 12:28 PM

I have done exactly this on mine. Diamond Eye 4" with muffler, deleted dpf and shutoff egr. I have not noticed any great increases in mpg, although we are getting into winter fuel and longer idle warmups. I have tracked every tank since I bought the truck in Oct 2011 (81k mi), deleted in Nov 2012 (101k mi). I am trying to see if there is any significant change before I buy some tuning, but have a feeling the tuning will do more for mpg than eliminating regens and exhaust restrictions.

ironman_gq · 12-26-2012, 01:03 PM

Biggest thing is cooler EGT's and maybe better throttle response and mileage, less back pressure should let the turbo spool a little better.

Jday · 12-30-2012, 09:41 PM

If I remember correctly, my LMM did 310hp stock with DPF and everything. With the 5" straight pipe (no tuning yet) it did 330hp. All my truck did without a tune though was back out of the first garage bay and pull into the next where it dynoed. I think you'll run into issues if you delete the DPF and don't tune it.

12-25-2012, 12:55 AM	eBay Motors #11 (permalink)
lddrew DuramaxForum Fanatic Join Date: Jul 2010 Location: Athens, GA Posts: 7,666	He probably also tuned it. They were giving stock tunes with dpf turned off mileage Sent from my ADR6350 using AutoGuide App __________________ -Lee- LBZ Crew - EFI - MBRP - Profab - Airdog Raptor lined rockers and flares by me my "build" thread Raptor color match thread ATP Trucks

12-26-2012, 12:28 PM	eBay Motors #12 (permalink)
bb_max Senior Member Join Date: Mar 2012 Location: Chelsea, IA Posts: 252	I have done exactly this on mine. Diamond Eye 4" with muffler, deleted dpf and shutoff egr. I have not noticed any great increases in mpg, although we are getting into winter fuel and longer idle warmups. I have tracked every tank since I bought the truck in Oct 2011 (81k mi), deleted in Nov 2012 (101k mi). I am trying to see if there is any significant change before I buy some tuning, but have a feeling the tuning will do more for mpg than eliminating regens and exhaust restrictions. __________________ Brian current: 07 LMM ec/sb ltz black & black, DE 4" turbo back, egr shut off, Edge Insight CTS dead: 06 lbz ec/sb white, killed a honda on its way out

12-26-2012, 01:03 PM	eBay Motors #13 (permalink)
ironman_gq DuramaxForum Veteran Join Date: Mar 2011 Location: Northern MN Posts: 1,474	Biggest thing is cooler EGT's and maybe better throttle response and mileage, less back pressure should let the turbo spool a little better. __________________ 2008 2500HD LTZ, EFI Live- Idaho Rob's Tunes, 4" Magnaflow Turbo Back, Raptor 150 Lift Pump, Transgo Jr, All Season Diesel EGR delete with high flow Y-bridge, Edge Insight for gauges,

12-30-2012, 09:41 PM	eBay Motors #14 (permalink)
Jday Senior Member Join Date: Feb 2011 Location: Brownwood/College Station, TX Posts: 385	If I remember correctly, my LMM did 310hp stock with DPF and everything. With the 5" straight pipe (no tuning yet) it did 330hp. All my truck did without a tune though was back out of the first garage bay and pull into the next where it dynoed. I think you'll run into issues if you delete the DPF and don't tune it. __________________ Fightin' Texas Aggie Class of 2014 2009 GMC Duramax Diesel ECSB 4x4 - EFI Live by Relentless Diesel Performance, EGR blocked, 5" turbo back, Autometer boost & pyro, XD Badlands, Mickey Thompson MTZs, color matched, debadged, t-bars lowered, 2" drop shackles, Recon cab lights, UWS toolbox, Cobra 29 CB

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