Terrible mileage

[6fourstroker]

Damn maybe it's bc of the single set up? Mine on factory compounds, deleted, 5inch Exhaust, s&b filter, and 32inch tires running gearhead hot street tune I get 18.3

 

[6fourstroker]

6spd

 

[SEABEE08FX4]

With my S366 my mileage went up buy about 1 MPG, when I switched to a S371 it stayed the same maybe slightly less. Not sure yet what will happen with the S467 as I haven't finished it yet. But generally you usually gain a little mileage from a single swap.

 

[Radioflyer]

With my S366 my mileage went up buy about 1 MPG, when I switched to a S371 it stayed the same maybe slightly less. Not sure yet what will happen with the S467 as I haven't finished it yet. But generally you usually gain a little mileage from a single swap.

Pretty much same differences I saw with mine.

I 6in lift, similar tire size, and bumpers as the OP and my S371 got the same mpg as my stockers did, and the 66 went up a little like eric said. Averaged about 12-13 no matter what I was doing on all 3 setups.

Went back to stock height, 275's, stock bumpers (as it sit's currently) and i got about 14mpg consistently around town and best i saw with the 66 on the highway was 18 when i caught a day without head wind. stayed normally around 16 (80mph is our speed limit). With my GTX, seeing about the same but playing with tuning still so I haven't really been paying much attention.

 

[08250]

His do ya like the hot street tune?? I'm running the street tune, gonna try out the hot street. I got the tow, street, hot street and race, I've only ran the street so far.

 

[6fourstroker]

His do ya like the hot street tune?? I'm running the street tune, gonna try out the hot street. I got the tow, street, hot street and race, I've only ran the street so far.

The hot street tune is awesome.. Haven't used tow or street yet.. But hot street is great. I've used race a time or too but don't wanna stretch my studs lol.. It opens up a lot more when boost hits.

 

[drunk on diesel]

I've been running the race tune for a couple hundred thousand miles between a few 6.4's. I wouldn't loose any sleep over stretching "studs"

 

[SEABEE08FX4]

The hot street tune is awesome.. Haven't used tow or street yet.. But hot street is great. I've used race a time or too but don't wanna stretch my studs lol.. It opens up a lot more when boost hits.

There are trucks out there running large turbos, injectors, dual pumps and much much more aggressive tunes who aren't stretching studs. I wouldn't sweat it.

 

[Black AOD]

are you the one with egt's around 1000 cruising?

That would be me.

Um, what?

 

[08Monster]

Um, what?

I run 1000-1050° on flat ground, cruising at 75.

 

[Black AOD]

those are high EGT's for those conditions.

 

[08Monster]

those are high EGT's for those conditions.

You're telling me. The question is, why?

 

[Radioflyer]

Is it still doing it Ethan? Did you get the last tcm tune loaded into it?

 

[pog]

You're telling me. The question is, why?

what's your boost at when cruising?

 

[08Monster]

what's your boost at when cruising?

Sitting at 5 right now. 71mph

 

[Powerstroke Man 6.4]

Sitting at 5 right now. 71mph

I got some revised tunes and when I ran the truck on the free way it ran 5-7 at 60 with 750-800 egts on my custom GH race.

Did you ever get your tunes revised by GH?

 

[08Monster]

I got some revised tunes and when I ran the truck on the free way it ran 5-7 at 60 with 750-800 egts on my custom GH race.

Did you ever get your tunes revised by GH?

Working on it now

 

[Powerstroke Man 6.4]

Working on it now

My engine and trans tune took about 4 reversions. The truck started from having no bottom end laggy and had no power climbing hills high cruising egts. to tapping the go fast pedal and boom I'm gone LOL.

Matt worked some magic on my tunes and I love it.

 

[SEABEE08FX4]

Elevation ?

 

[TyCorr]

cow killer bumper = -1mpg

light bars = -1mpg

4.5" lift = -1mpg

mud tires = -2mpg

dirty smokey tune to try to get 66mm turbo lit = -2mpg

it's not a magic formula

The obvious, unwanted truth. In certain cases a little drag created by tires of larger size is welcome but in this case a smaller displacement motor crippled by even less air and a huge drag/resistance load waiting to be overcome by the boost you cant effectively make to begin with.

I bet that setup would rip with stock turbos or a 59/72. If you have to run a single get an s362 and see what spoolup is with a single.