Compression Ignition Addict
Join Date: Sep 2012
Location: The 'Sip
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I don't know how much he charged you, but it's these kinds of questions you're asking right now that you wouldn't have to worry about if you bought one of the tuners that just about every 6.4 forum recommends (Mini Maxx/XRT Pro or Spartan) which makes that money well-spent. You could change tunes whenever you wanted and you'd have a known quantity and product to deal with. Plus, unless this guy is seriously good, I doubt he's just going to write a tune that's better than what the H&S or Spartan guys put out unless he's running it on a dyno and tuning that way. 60+, 90+, and even 150+ HP on a 6.4 is pretty minor. I know they seem like big numbers on most other trucks, but on this thing, you can double all those numbers without even trying. These are just plug-and-play tunes.
We're all going to have to guess because we have no idea what this guy did to your truck. A tuner like the Mini/XRT Pro or Spartan takes about 20 minutes to install initially and then it's ready to go. I don't know how much faster you would've wanted it, but I'm guessing this guy took longer than that.
I was basically asking if you were calculating this off of highway or city driving. If in the city, what kind of stop and go is it? How long are your average trips? Hills? Loaded? This all makes a huge difference.
So, my advice is to run a few tankfuls with the tune and keep out of the boost. Report back with some mileage and see how it compares. If you're tuned in the city (average city), you should be somewhere around 13-15.5 MPG and on the highway 14-18 MPG (all hand calculated). Usually those are achieved with big HP tunes (250+ HP). The torque converter lock up may help as well (some of us lock it up at lower speeds). Again, with the tuners mentioned above, these are all known quantities and it's a lot easier to help you. Until we find out what he did, it may be impossible to suggest ways to improve it or of something is wrong.
I know you probably hate to hear this, but it may be time to go pick one of those tuners up.
It may be your only purpose in life is to serve as a warning for others.