revtech dfo
Road Master
Joined: Dec 2006
Posts: 1,058
Likes: 6
From: Omaha Nebraska
RE: revtech dfo
Like always, it depends,if your engine is running lean now and you "properly" tune it to bemore rich, your mileagewill probablydecrease or vice versa. Also, what is a "proper" tune, if you ask severalexpert tuners you will get several answers. Some engines, different combos and different tuners useor require differentfuel mixtures.Some tuners will bias an enginemore rich during cruisebecause the engine runs cooler at the expense of milage. Unless we are onlytrying tominimize polutants, there is no"proper" A/F ratio or tunefor every engine.
Extreme HDF Member
Joined: Sep 2006
Posts: 10,033
Likes: 29
RE: revtech dfo
In theory, you shouldn't get better mileage since the unit only adds fuel. However, if you have it properly tuned, you also shouldn't loose any mileage either. I run a DFO and averaage in the low 40's for most riding....that's even with my lower 3:37 gearing.
Road Warrior
Joined: Nov 2006
Posts: 1,738
Likes: 7
From: St. Charles, IL
RE: revtech dfo
The Revtech, as said, only adds fuel. But, since I've read that the bikes are tuned a little lean from the factory, you don't always need a fuel manager that will add and subtract fuel. So, if it adds fuel, you will loose a few miles per gallon, but not many if it isn't tuned too rich
6th Gear
Joined: Aug 2007
Posts: 10
Likes: 0
RE: revtech dfo
I have just bought a 2004 Road King with a Rev Tech DFO. It has had a screaming eagle upgrade. (cylinders pistons breather and cams). and slip on pipes. This was all installed at HD. Does anybody have instructions that came with the DFO. It runs good but I would like to know a little more about it and how it works. Thanks
Extreme HDF Member
Joined: May 2005
Posts: 16,656
Likes: 13
From: The Big Easy
Trending Topics
Elite HDF Member
Joined: May 2006
Posts: 3,927
Likes: 5
From: Midwest
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
8 Best Harley-Davidson Motorcycles Ever
Pouria Savadkouei
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
10 Things Harley-Davidson Needs to Fix in 2026
Verdad Gallardo
Southpaw Super Glide: A Left-Hand-Drive 1979 Harley FXE Built to Fit the Rider
Verdad Gallardo
Tourer
Joined: Jan 2006
Posts: 308
Likes: 0
From: SUNNY,FL
RE: revtech dfo
ORIGINAL: rkh
I have one more question about the dfo. If the dfo goes bad will the bike just quit or will it run on the EFI system and burn a hole in my piston. The bike has not been remaped. Thanks
I have one more question about the dfo. If the dfo goes bad will the bike just quit or will it run on the EFI system and burn a hole in my piston. The bike has not been remaped. Thanks