For those of you who are new... bought my truck with 13.3k miles on the clock back in 2006. Truck has already seen a lot of change over the years with light performance mods, tuners, lift and tire changes. Its been off road on the White Rim trail (avatar pic), trudged thru the Sierra Nevadas and in various spots in the Cascade mountains. Its been airborne on 1 occasion, beat many times and has still keeps going. It has let me down a few times, transmission mostly and a couple of electrical issues, one of which was my fault (loose ground wire). To say the least its been around the block a few times.
Currently, to my surprise it does not use oil from oil change to oil change. I have had it use oil however under certain circumstances, high rpms under zero load on steep grades. Not sure why but seems like the oil level drops when these conditions present itself.
Anyways on to the fun stuff... Taking my truck back to stock front end... tired of working on it. So, steering is swapped back to 08.5 steering, replaced the ball joints (carlis worn and need to be looked at), possibly swapping back in stock springs and removing spacers in rear to bring it back to stock height or slightly lower.
H2's are coming off in favor of a 20# OEM wheel, 1st gen spyntec's are coming off for 2nd gens to better be aligned with the OEM wheels specs.
Fan clutch is having an issue, already worked on the fan shroud I build a couple of years back and have cut it down some in an effort to get it to fit with the OEM radiator (did not fit with the BTR radiator that used to be in there. Dragging this down to Cali with me over the holidays with the intent to attempt to get it in there. I already know how it performs and have no worries once its in there that it will keep things in check.
What I wanted to know was how much each change contributes to any mpg change. Before the fan clutch issue, I could count on 20~20.3 mpg all day everyday too & from work. Did not matter if it was rush hour, hiway speeds, mpg was always in that range.
With all that said, first up is the fan swap. It is very clear when the fan clutch is locked up vs unlocked. Throttle response takes a big hit, which affects mpg, lately low 19's are what I'm seeing. Part of this is because of the cooler intake temps but not much. I have the current tune dialed in with IATs down into the low 70's which I see fairly often day to day, usually climbs up into the low 80's. OATs are in the upper 30's low 40's.
So for anyone looking to know potential mpg changes with:
- E-fans (2 volvo fans, each pulling 3700 cfm on high)
- light weight wheels, current wheel is 30#, next wheel will be 20#
- stock height vs 2" leveling kit
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"Baseline mpg" quirky fan clutch for ~410 miles, no fan for ~85 miles, e-fans installed, one interferes with fluidampr and has been removed. No power to the fans as of yet, CTs are more consistent around 200*f, lower temp swings.
495.5 miles, 25.087 gallons, 19.751 mpg Fan clutch, air dam in place, ~85 mi no fan.
52x miles, 70+ at times, 20.348 mpg, No fan power, rush hour traffic often and timing rattle. IATs mostly in the 60's and barely into the 70's for most of the tank, last 120 miles had IATs in the upper 70's low 80's with ambient temps being higher all day
518.3 miles, 26.338 gallons, 19.678 mpg No fan power, IATs mostly in the 60 & 70's, high winds & heavy rains for several trips on this tank.
497.5 miles, 25.586 gallons, 19.444 mpg no reason for poor mpg... road conditions were OK, one trip had heavy rain for a short distance. tweeked timing, IATs upper 60's to upper 70's.
404.8 miles, 20.717 gallons, 19.539 mpg, no reason for poor mpg, road conditions were OK, stuck in accident traffic for 45 minutes. Updated tune installed after this fillup. restored CT/IAT table to equal KGT file
29x.x miles, <unknown gallons>, 20.586 mpg, good weather, 70+ mph at times, 1000-2300 rpms used. fixed the tune, reverted the CT/IAT warmup table, took it back to the last KGT file table and left the IAT compensation table as it was. I can hear certain areas of the tune needing to have timing backed off a bit, most likely cause of the advance on the IAT table. Will fix this later as its a minor issue.
42x miles, <unknown gallons>, 19.527 mpg, great weather, Canada track trip, intermittent mis-fire/vibration started after 200 miles, cause unknown. MPG was looking great before that. First inspection points to a bad output TC bearing. does not seem like it would be related to a mis-fire, it could just be bad vibration being interpreted as a mis-fire. Will get the bearing fixed and go from there.
@350 miles on this tank, had to go back to a base file. Existing file did not want to run with ambient temps @30~32*. Found this out the hard way after coming back from Cali (flight) and no time to fix it. Base file is the one created by HPT when I vin locked my truck.
19.140 mpg 487.9 mi, 25.491 gal HPT base file installed, odo approx 0.5 mph off on low side
Current tank notes on 2/23... 33 mi in 4wd, ambient temps in the upper 20's, IATs in the 40-60 range, wheel install done. 70~75 mph @ times, minimal stop & go... @80 miles. Installed V2_0 air dam, then ran test runs to check it out, multiple runs testing air dams and IAT data collection. All still on base tune, new wheels installed.
551.1 miles, 27.847 gallons, 19.790 mpg
492.2 miles, 24.346 gallons, 20.202 mpg... speeds kept in check, hit 67 a few times but most of the tank was as expected. Winds and heavy rain on 1 45 mi trip but for only about half of that distance. Updated ECM with speedo & gear correction.
Miles = 572.7, gallons = 27.232, mpg = 21.030. TQ LOM = 22.7mpg speedo corrected, IATs climbing higher with a few trips into the 70's & 80's 21.3 mpg tune going in today 3/11
552.5 miles, 25.757 gal, 21.4 mpg. TQLOM = 22.2 mpg. ~23+ drive events from 3/11 thru 3/17, ~10-11 cold starts, couple of days with IATs up in the 80's, 1 into the 90's, mostly 60-70 range. A new personal best in the colder months, especially over a 6 day period. Speeds mostly 60-65, 67~70 a few times.
569.2 miles, 26.623 gal, 21.380 mpg. TOLOM = 21.2
Fan power connected 3/24
525.5 miles, 25.451 gal, 20.647 mpg TQLOM = 21.2
Lift removed, guilty of 70+ on several occasions...
581.0 miles, 26.913 gal, 21.588 mpg TQLOM = 21.3
533.1 miles, 24.003 gal, 22.207 mpg. Lift gone, speeds 68 or less, fan disabled, coasting where it makes sense, IATs in the mid 60's, lower 70's. 04/05/18, 20 trips on this tank over 3 day period
<unknown miles>,<unknown gal>, 20.6x mpg (SIL drove & drove it hard...)
570.7 miles, 26.334 gal, 21.671 mpg, TQLOM = 21.3 mpg, nasty weather on the front and back end of this trip, Col River trip, 2 summits. HSS installed on this fill up.
493.7 miles, 22.449 gal, 21.992 mpg. TQLOM = 21.6 mpg. HSS tank, warmer weather
04/21/2018 - truck retuned
491.3 miles, 22.980 gal, 21.379 mpg. Truck retuned, not so kind to throttle at times during the tuning. IATs up into the 70-90 range, adjusted the pedal map.
4/27/2018 - way more 70+ mph speeds than recent tanks, stuck on the wrong side of the morning accident today and crept along for 20~25 minutes. Intake temps up there in the 80-95*f range. Both fans hooked up on low and are doing a good job of keeping temps in check. High connection not yet made, fan switch in hand & needs install.
547.1 miles, 25.321 gal, 21.606 mpg.
457.4 miles, 20.512 gal, 22.299 mpg
573.6 miles, 26.875 gal, 21.343 mpg, lots of 70+ mph, high iats, trailhead climb (wta day), passing on 2L rds.
5/12/18 Aero updates installed prior to fillup, front grill block, wheel well vents, rear spats
636.6 miles, 29.658 gal, 21.464 mpg, no attempt at for driving for mpg, lots of 70+mph, high IATs, steel toed boots on, and are not good for mpg driving! (foot injury)
5/13/18 Columbia Gorge trip, IATs on way back 105-108*f
349.5 miles, 16.012 gal, 21.827 mpg, speeds 68 or less. 359k miles
5/18/18 typical work week traffic, IATs up in the mid 70-95 range...
576.4 miles 25.974 gal 22.191 mpg, speeds 95% good, couple of higher speed drives on commute home.
05/22/18 Rain, heavy foot, 70+ IATs 70-95 range typical traffic
485.0 miles, 23.288 gal, 20.826 mpg,
05/25/18 bumper mod IATs good
275.4 miles, 12.643 gal, 21.782 mpg,
06/17/18, 464.9 mi, 24.395 gal, 19.057 mpg. Cali trip, 80+ mph
06/16/18, 435.7 mi, 24.093 gal, 18.084 mpg. Cali trip, 75+ mph
Retuned in higher rpms, set higher altitude maps = to sea level and reduced FP 2 mpa on ea table vs the lower alt table.
06/23/18, 536.6 mi, 25.535 gal, 21.014 mpg. Normal commute minimal eco driving, 70+ mph at times
For reference, hpt mpg thread, best comparison for current tune, intake temps were higher & had fan clutch installed
07/08/2016___551.8___ 28.016___19.696 UDC programming/190*F stat
07/15/2016___554.4___ 28.596___19.387 Stock programming
07/19/2016___574.0___ 29.532___19.332 Stock programming, higher speeds & warm IATs
08/06/2016___490.3___ 26.355___18.618 3rd event delete, stock file, fan activation temp change from 24*f to 29*f
08/18/2016___549.2___ 26.929___20.394 3rd event delete, rail pressure, duration & some timing... key was the pedal table.
04/18/2017___515.1___26.xxx____19.49x lots done, finally getting consistent numbers
07/08/2019 531.5 miles, 24.896 gal, 21.348 mpg zero eco driving speeds 70+ at times.
Fan install images & first impressions
Current truck config... 2" thuren springs, full leaf pack in rear + 1 spacer, H2 wheels (thought I weighed them @ 30# ea)
H2 Wheels, 30.8#
4th gen wheels
Front air dam installed... brown piece in front of the axle
Electric water pump install