If you put an high flow screaming eagle air cleaner on a stock 07 twin cam motor do you need to put any fuel managment on ?buddy put one on and ran like crap,dealer sld to him and installed and said would need to be dyno?just for an air cleaner,know back to stock after $500 spent think he got screwed
Hmmmm. "ran like crap" after installing an air cleaner. So much for the adaptive fuel correction. Should have run just like it did before the install if the "adaptive fuel correction" was as good as the previous post made it sound.
Oh, btw trahog, what kind of air cleaner did he get from that dealer for $500? That's rather steep for the old fashioned SE air cleaner (MSRP $139.95). Maybe it was the Heavy Breather ($299.95), or the Ventilator ($229.95), both flow better than the old SE round filter. Still a pretty steep price though, since it shouldn't take more than 1/2 to 1 hour for the install. Are you sure he didn't change mufflers as well? Truth be told, that's what I had assumed when I first read this thread and posted my first reply, the good ol' Stage 1 air cleaner and slip-on upgrade, approximately $500.
Adaptive fuel correction is nothing special or new, it's been part of the system on every closed loop EFI I've ever seen. However, the stock system is not designed to correct for performance modifications, it's only purpose is to make corrections required by the manufacturing variations in things like sensors, fuel pump volume and pressure, fuel injector flow, etc., and then to make small
corrections over time as the various components wear. This is all meant to maintain compliance with emissions regs over the life of the product, not to make it easy to do modifications.
If someone spends $500 plus on so-called performance mods, I naturally assume they want the bike to run better than stock. Sure, up to the fairly narrow limits of the system
get away with not using a tuning device. For someone who just wants a slightly louder muffler for instance, and isn't unhappy with the heat and the way the stock bike runs, the change in flow probably won't exceed the ability of the ECM to compensate. So the bike will run at 14.7:1 in closed loop, just as poorly and just as hot as it did when it was totally stock. And without a dyno and exhaust gas analyzer, you won't really know what AFR you're running in open loop. Probably
can get away with it, since H-D's stock maps are a little rich at high rpm and wide open throttle to protect the engines.
Where I'm going with this can be basically boiled down to, do you really want maybe, might, probably
; or do you want to know for sure? Do you want stock performance after investing additional cash, or do you want better performance and reliability? The way the current bikes run from the factory, I would personally use a tuner even if I had no plans to modify anything.
PS. As always, feel free to believe whatever you want. I'm certain there are many things that I've been wrong about over the years, so I wouldn't want anyone to take my word as gospel. Before taking the word of any individual, especially folks you've never met and don't know, I would recommend you do a little research somewhere other than on a public discussion web site. The amount of BS I've seen on the web would be enough to fertilize every piece of arable land in the entire world, several times over, and leave plenty for other purposes as well. If you want the straight skinny on a lot of this stuff, check with the SAE (Society of Automotive Engineers) or other reputable and well known technical organizations.