Originally Posted by FishByFly
Anyone running with a tuner on their diesel for additional mpg? Every time I research this, my head swims.
because I catch fish on a fly...
2017 25' FB Flying Cloud Queen
2010 F250 Lariat
Past: 2005 30' Safari Bunkhouse
Past: 1986 28' Excella Twin
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On the subject of tuners...
I suppose it depends on what year your truck is but in general, tuners make me nervous. Certainly, with my 6 month old Ram, the owners manual states that any attempt to use a tuner will render the vehicle unable to start and subject you to voiding of warranty.
As the silly truck makes something like 800 pounds feet torque, has averaged 18.4 mpg overall for the first 8500 mile, 16.5 mpg towing for 2000 of those miles (all while not even broken in yet...) has the cleanest tailpipe of any car I have ever owned, makes really, really great sounds, shifts like it can read my mind... I simply can't imagine what the gain would be!
Now, if I owned a Ford 6.0 and wanted to "bulletproof" the engine I'd think about a tuner as part of a package...but I'd want one as part of a system of improvements engineered by a big company with a proven track record.
My concern about modifying modern vehicles is that so many of the systems are integrated that simply modifying software in one area, say shift firmness, doesn't necessarily take into account everything that might be happening.
This software gets complex and the trucks manufacturer has simply got to have the most complete picture of what is actually happening.
The other thing about tuners is that finding objective reviews of their capabilities is virtually impossible.
I once got bitten by the bug and when my previous 2010 F-150 had about 75,000 miles on it, I decided to see what I could achieve with a tuner. I read everything I could, talked to companies tech departments and decided to try one. I got the thing, read the instructions and loaded the "canned" (not custom) tune into the truck. It was a mild tune and it did not promise anything earth shattering, just something like 30 extra horsepower and firmer shifts.
I left the tune in for about 1 month. The only real difference I noticed was that the engine seemed to ping under load. Just a soft, barely able to be heard gravelly noise... To be honest, there was no real improvement in performance, and my fuel mileage was about what it always was.
I didn't like the noise the engine made and called the manufacturer and asked why the knock sensors where not seemingly remapping ignition under load...
They told me that they were but just less aggressively.
To make a long story short, I removed the software after about a month and sold the tuner (lots of 2010 F-150 owners out there). My truck returned to its quieter ways and actually seemed much happier again.
About 12 months later I received an urgent sounding email from the company who made the tuner that insisted that the tune software be removed from the vehicle. Seems that the knock sensors had been deactivated in the software and damage could result...
I passed the info on to the new owner of the device and was pleased with my decision to get rid of it.
Nope, no tuners for me...