Heard a shop foreman say ECU tuning is just for hot rodders and I had to speak up

I was changing oil on a 2015 Freightliner Cascadia last week when the foreman walked by and told a younger guy that messing with the ECU is a waste of time unless you're trying to win a drag race. I bit my tongue but I disagree. I've been tuning fleet trucks for fuel economy for over 3 years now and I've seen consistent gains of about 0.5 to 1 MPG by adjusting the torque curves and idle parameters. That adds up to real money when you're running a dozen trucks 100,000 miles a year. Has anyone else gotten pushback from older mechanics who think the ECM should be left untouched?

2 comments

2 Comments

uma3061mo ago

Fleet in my area (Vancouver) has an older mechanic who still calls ECU tuning "black magic" and refuses to touch it. I've seen the same fuel savings you're talking about though, and that really adds up over a year of highway miles. It's tough when the old school guys dismiss it because they just don't want to learn the new stuff, you know?

lisa_grant1mo ago

Are you serious? I've got a guy at my shop who's exactly the same, calls any laptop hooked up to a car "voodoo stuff" and I swear he thinks we're all wizards now. I had a fleet of delivery vans last year and got them all tuned for highway cruising, saved like 15% on gas across the whole year which is no joke when you're doing 50k miles per van. The old timers just get stuck in their ways, they'd rather rebuild a carburetor than plug in a scanner even if it saves them three hours of diagnosis. Wish they'd see it's just another tool, not witchcraft.