07.5+ LMM Duramax PowertrainDiscussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect
Start off by re-calibrating the speed-o.
From every programmer I have ran across you can only re-cal up
to 35`s.
The taller the tire the speed-o and miles will be off.
You are going faster than what the speed-o is actually showing, and the miles driven will be less.
My 79 Chevy has 35`s but the speed-o was never re-cal, I add 17%to the mileage driven to get a accurate MPG.
If any of you have a hand held gps you can compair the miles driven the actual speed you are going.
If you don`t re-cal as close as you can it will throw everything off with the computer.
__________________ 2007.5 GMC Sierra 3500 SRW BLACK,SLT,C.C.,4X4Loaded,DMax,(except for a aFe OEM airfilter part # 71-10101 Complete stock air intake mod, deleted the restricted muffler),Allison,Westach single gauge combo reading EGT/Boost egts from the pass. side, BD Manifold EGT readings drivers side on the Edge Insight, Rear Firestone Air bags with incab controller,back-up sensors, Back-up camera monitoring thru the nav monitor same as factory.
Security System Clifford Matrix 50.7 2 way remote with LCD. "Nitto Terra Grappler" 285-70R-17
Oil used http://www.castrol.com/castrol/secti...tentId=7020026
when me and my buddy drove on a 650km trip in our trucks i got almost as good of mileage as him (i burned 2L more) and yes we filled them right up so they were the same fuel capacity. hes all stock i have a 6" lift and 35's. At that time i didnt have any of my mods but i bet im gettin better fuel mileage than his stocker now.
__________________ 07.5 Dmax Pioneer F90BT Nav Unit, Compustar Alarm/Remote Start, 6 inch Tuff Country lift on 35X12.5 Toyo MT's, 5 inch stright pipe/6 inch tip, turbo resonator plugged, transgo jr, Autometer cobalt pyro, boost, fuel pressure gauges, EFILive, S&B intake, AFE intercooler tube, airdog 150, PPE shim kit. Soon to come, EGR blocker and Diamond Eye Downpipe.
Thanks to Jess @ HUSKER DIESEL PERFORMANCE WWW.HUSKERDIESEL.COM
86 3/4 ton bowtie 350/350 sitting on 44x19.5 swampers, gutted and custom interior with full interior rollcage,checkerplate dash, 10" lift and a wack load of speakers.
I get 16 mpg hand calculated. 4" lift with 35"x12.50 toyo mt's. And the engine is bone stock
__________________ Blacked out 17" american racing rims, 35" Toyo MT's, Blacked out Grill, Homemade Headache Rack, 5" Exhaust Tip, Westin Step Bars, 4" Lift. Engine all stock for now
I get 16 mpg on the highway at 70mph. With the 4wheeler in the back and a couple of goodies, 14.5-15mpg. Used to get 17 when I had BFG AT's(315/70/17"s)
__________________ 2006 2500 LBZ CREW CAB LONG BED * NFAB STEP BARS
35" TOYO OC MT"S W/ 18" ROCKSTARS * FABTECH 6" LIFT * FABTECH HD TIE RODS
BD FULL BORE MANIFOLD * S&B CAI
4" STRAIGHT PIPE EXHAUST * MBRP 5" TIP
TRANSGO JR 4/11/09...THIS WAS A GREAT MOD!!!
BANKS INTERCOOLER * RESONATOR HOLE PLUGGED
EGR BLOCKER PLATE * EDGE INSIGHT MONITOR TUNED WITH EFI LIVE>>>NOTICE I AM SMILING!!!! www.performancetruckproducts.com www.huskerdiesel.com
Believe it or not my '03 lb7 got 20.6 mpg between Houston and Dallas. 75 mph avg. On 38" tires, Edge juice w/ attitude set at level 3.Engine turns 2000 rpm's @ 75mph.
You were not getting almost 21mpg.
Quote:
Originally Posted by slimwolf
How are you getting that low of an rpm with your truck. I run 2200 at 75mph
Remember a 6 speed drops rpm by 300.
31.44" tall tires for me and im running at 2k at 75mph.
__________________ Brian, 19, 06 LBZ, EFILive, MM Diesel Performance, Alligator Performance, Suncoast, TTS, Cognito, High Tech Turbo, PPE, Magnaflow540rwhp/1000tq. 12.64/107.52
For the one`s that have NOT re-calibrated the speed-o do you own math just enter the tire size the truck came with that is on the lable on the drivers door.
Then enter the tire size you are running now.
You will then see your miles you have driven is off as well as your speed.
So when you are calculating your mpg you will see that you are not even close to what you think you are getting, if you make the proper adjustments.
__________________ 2007.5 GMC Sierra 3500 SRW BLACK,SLT,C.C.,4X4Loaded,DMax,(except for a aFe OEM airfilter part # 71-10101 Complete stock air intake mod, deleted the restricted muffler),Allison,Westach single gauge combo reading EGT/Boost egts from the pass. side, BD Manifold EGT readings drivers side on the Edge Insight, Rear Firestone Air bags with incab controller,back-up sensors, Back-up camera monitoring thru the nav monitor same as factory.
Security System Clifford Matrix 50.7 2 way remote with LCD. "Nitto Terra Grappler" 285-70R-17
Oil used http://www.castrol.com/castrol/secti...tentId=7020026
The AutoGuide.com network consists of the largest network of enthusiast-owned enthusiast-operated automotive communities.
AutoGuide.com provides the latest car reviews, auto show coverage, new car prices, and automotive news. The AutoGuide network operates more than 100 automotive forums where our users consult peers for shopping information and advice, and share opinions as a community.
!!!!
Linear Mode
