Compression Ignition Addict
Join Date: Feb 2009
Location: Mercer County WV
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Some tunes will increase MPG, IF they are driven properly. My 6.4 gets WAY better mileage than before I tuned it. But if I beat the guts out of it racing out of every light, it get trash mileage.
Smoke tunes are hard on the engine, black smoke is incompletely burnt fuel, so you are just dumping more fuel in the cylinder than can be effectively burned, this can be a quick path to a melted piston.
The lope tunes, you hear a lot of back and forth on lope tunes, I think they sound neat on some trucks, but others it sound terrible. They way that some people get a lope tune is by commanding way more fuel than is necessary at low idle so the computers cuts out certain parameters to maintain the correct idle RPMs. I've heard some horror stories, other people haven;t had issues, but when I did my own research and learned what was going on for that sound, I opted to steer well clear of that tuning....
2009 Subaru WRX Premium
Type RS BOV
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Had to park it with some real diesel muscle....