Why 6.0s are so thirsty?
On The Tree
Joined: Nov 2010
Posts: 156
Likes: 1
I have recently picked up HPT and hope with time I can make some refinements that improve driveability but certainly don't expect to pick up meaningful fuel mileage. I think if there were truly issues the tuners would already have posted the fixes.
I have read DFCO? Is one area to explore but I am still in the trans tuning mode, and just touching on it.
I have read DFCO? Is one area to explore but I am still in the trans tuning mode, and just touching on it.
Thread Starter
TECH Veteran
Joined: Sep 2014
Posts: 4,893
Likes: 703
From: Mississippi
I completely understand where you guys is coming from with diesels. They are beasts towing and gets great mpg while doing so.
Now the downside... a used diesel you take a risk. A big one and the new ones can cost easily 70 grand.
All of them have they flaws as well that's really expensive to fix.
Dodge Cummins tranmission are known for going out. Well that's 3 grand right there.
Fords- head studs I know for sure. Also I hear the oil cooler goes out on the 6.4 engines. That's 2500 to 3 grand.
Chevy/GMC... Well injectors are always getting the bad rep here. I'm sure they not 200 dollars to replace.
Now back to the 6.0s... it would be nice to see if anyone could benefit at the gas pump from a tune, exhaust and a afteemarket air filter.
Now the downside... a used diesel you take a risk. A big one and the new ones can cost easily 70 grand.
All of them have they flaws as well that's really expensive to fix.
Dodge Cummins tranmission are known for going out. Well that's 3 grand right there.
Fords- head studs I know for sure. Also I hear the oil cooler goes out on the 6.4 engines. That's 2500 to 3 grand.
Chevy/GMC... Well injectors are always getting the bad rep here. I'm sure they not 200 dollars to replace.
Now back to the 6.0s... it would be nice to see if anyone could benefit at the gas pump from a tune, exhaust and a afteemarket air filter.
If you're not going to be towing really heavy on a consistent basis then a diesel isn't worth the added cost IMO. I heavily considered a diesel before buying my truck but I wanted something with relatively low mileage, and not beat to death. I found my truck in Kentucky with 52k miles on it and I gave $15,500 for it. I know the 6.0 and 80E will last for a very long time if taken care of. My only concern with my 03 is rust issues here in Iowa but that's why I bought my Saturn to DD. The truck will stay parked in the garage this winter unless I absolutely need to drive it for some reason.
I have the E-fans and muffler to install on my truck in the very near future. We will see if that helps out with MPG at all. Even a slight increase will make me happy. I know the tune woke it up quite a bit and it really is nice to drive. Could definitely use some more power towing the boat but it still pulls it just fine.
I have the E-fans and muffler to install on my truck in the very near future. We will see if that helps out with MPG at all. Even a slight increase will make me happy. I know the tune woke it up quite a bit and it really is nice to drive. Could definitely use some more power towing the boat but it still pulls it just fine.
I have recently picked up HPT and hope with time I can make some refinements that improve driveability but certainly don't expect to pick up meaningful fuel mileage. I think if there were truly issues the tuners would already have posted the fixes.
I have read DFCO? Is one area to explore but I am still in the trans tuning mode, and just touching on it.
I have read DFCO? Is one area to explore but I am still in the trans tuning mode, and just touching on it.
Efans will help immsensely. and a 160 tstat.
10 Second Club
Joined: May 2009
Posts: 3,427
Likes: 226
From: over dere
I completely understand where you guys is coming from with diesels. They are beasts towing and gets great mpg while doing so.
Now the downside... a used diesel you take a risk. A big one and the new ones can cost easily 70 grand.
All of them have they flaws as well that's really expensive to fix.
Dodge Cummins tranmission are known for going out. Well that's 3 grand right there.
Fords- head studs I know for sure. Also I hear the oil cooler goes out on the 6.4 engines. That's 2500 to 3 grand.
Chevy/GMC... Well injectors are always getting the bad rep here. I'm sure they not 200 dollars to replace.
Now back to the 6.0s... it would be nice to see if anyone could benefit at the gas pump from a tune, exhaust and a afteemarket air filter.
Now the downside... a used diesel you take a risk. A big one and the new ones can cost easily 70 grand.
All of them have they flaws as well that's really expensive to fix.
Dodge Cummins tranmission are known for going out. Well that's 3 grand right there.
Fords- head studs I know for sure. Also I hear the oil cooler goes out on the 6.4 engines. That's 2500 to 3 grand.
Chevy/GMC... Well injectors are always getting the bad rep here. I'm sure they not 200 dollars to replace.
Now back to the 6.0s... it would be nice to see if anyone could benefit at the gas pump from a tune, exhaust and a afteemarket air filter.
10 Second Club
Joined: May 2009
Posts: 3,427
Likes: 226
From: over dere
Stay away from dfco. Do a good italian tune up. Tr55 plugs, new wires, fresh good quality (not bosch) O2s up front, actual on rail fuel inj clean, fresh air filter, fuel filter if you have one, clean maf then tune the fuel trims and add a little timing. Take out the tm. Dont screw too much with trans, just pressure, tcc apply % and tm. That will give you a very good boost.
Efans will help immsensely. and a 160 tstat.
Efans will help immsensely. and a 160 tstat.
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On The Tree
Joined: Jul 2015
Posts: 153
Likes: 0
My 2011 non DOD 6.2 sierra was as good or better on fuel than any 5.3 I had. And WAY more power. Hook a trailer to it though and it'll get thirsty quick. That was still one of my favourite trucks.
4 door 4x4 with just a hyperjunk tuner
https://youtu.be/Sr5yFMN4gNw
4 door 4x4 with just a hyperjunk tuner
https://youtu.be/Sr5yFMN4gNw
Thread Starter
TECH Veteran
Joined: Sep 2014
Posts: 4,893
Likes: 703
From: Mississippi
Well after all its a LS motor and the simple fact that a 6.2 makes more power and gets better milage than a 6.0 and 5.3 both is quite impressive. Could the secret be hidden in the big factory square port heads? Who knows? I need to find the factory camshaft specs of each motor and go from there as well.
Ive not just done it to mine but at least 30 others. both 99-04 1500s and nbs and nnbs 2500s. Every single one saw a gain in performance and a little better mpg.
What fans did you use and how did you control them?
I can tell you you should have noticed a cooler ac, less engine bay clutter, better throttle response, less water pump issues, less low speed fan roar when its very hot outside.
Maybe next tim i get one done i can do a before and after situation to show actual gains.
What fans did you use and how did you control them?
I can tell you you should have noticed a cooler ac, less engine bay clutter, better throttle response, less water pump issues, less low speed fan roar when its very hot outside.
Maybe next tim i get one done i can do a before and after situation to show actual gains.
04 - 07 1/2 lq4 got the 01-02 ls1 cam which was markedly better than the cam that was in previous models.
The 4l80 trans has tall gears. For towing and hauling the 4l60 gear would be better and it even has a slightly better overdrive even has better reverse. The trans is weaker of course in stock form but lighter. Built up like a lvl4 + from rpm trans swap from 4.10s to some 3.73s would be pretty good. Thats as far down as you can go on the 10.5" ring gear....from motive/Richmond at least. not sure on aam or yukon etc.
The crusing rpm makes a big difference.
The 4l80 trans has tall gears. For towing and hauling the 4l60 gear would be better and it even has a slightly better overdrive even has better reverse. The trans is weaker of course in stock form but lighter. Built up like a lvl4 + from rpm trans swap from 4.10s to some 3.73s would be pretty good. Thats as far down as you can go on the 10.5" ring gear....from motive/Richmond at least. not sure on aam or yukon etc.
The crusing rpm makes a big difference.
If money was not a factor, I would have a Duramax, but I am happy with the 6.0/6L90 despite the 12 mpg.
I was getting 11.5-12 hauling a Grand Wagoneer on a Uhaul trailer and running 75-80.
Edit:
My 2010 2500HD is heavy, right about 7,200 on the scales at the landfill.
The computer indicates 12.1 average, 5,564 gallons of fuel over 113,203 miles.
My Dad's 2013 1500 crew cab shorbed 4x2 5.3/6L90? Has AFM, not sure about VVT.
The computer indicates 18.8 average, 1,868 gallons of fuel over 108,846 miles.
I was getting 11.5-12 hauling a Grand Wagoneer on a Uhaul trailer and running 75-80.
Edit:
My 2010 2500HD is heavy, right about 7,200 on the scales at the landfill.
The computer indicates 12.1 average, 5,564 gallons of fuel over 113,203 miles.
My Dad's 2013 1500 crew cab shorbed 4x2 5.3/6L90? Has AFM, not sure about VVT.
The computer indicates 18.8 average, 1,868 gallons of fuel over 108,846 miles.
I've used about 25,000 gallons. Holy S!
For the best and most economical way to do it use the wide radiator, 05 1500 fans, nelson harness, turn tune on in comp. done. fits exactly like factory and gives the option of the oil cooler to those that dont have it. Make sure you have at least a 120 amp alt or better the 04 escalade is about 140-145 and fits perfect.
Ive done that to so many i cannot count both 99-04 and all 2500s and 3500s i can. Simple, easy, reliable, clean.
Ive done that to so many i cannot count both 99-04 and all 2500s and 3500s i can. Simple, easy, reliable, clean.
On The Tree
Joined: Nov 2010
Posts: 156
Likes: 1
I was not joking, I had never heard of an Italian tune-up 
And regarding the computer mileage numbers I posted, thanks for the note, I had not verified the total fuel vs mileage. I know on my truck it's darn close on computer mpg at 12.1-12.5 but I calculate mileage based on the odometer and the fuel required to top off myself when I want good data.
And regarding the computer mileage numbers I posted, thanks for the note, I had not verified the total fuel vs mileage. I know on my truck it's darn close on computer mpg at 12.1-12.5 but I calculate mileage based on the odometer and the fuel required to top off myself when I want good data.
