Spent several hours reading in the archives about Xieds helps some but not so much for others. But my question is about a thread or post I could not find, and that would be a negative impact the Xied has for the new bikes. Please post this if you know what it is. Thank You

 

more fuel worse mpg. other than that obvious, my old fxd and current flhtp run cooler, respond better and perform better than without. no problems. now i do have stage 1 recalibration for correct fuel values for the heavy breather. xieds were done to richen up the closed loop not to cover-up the incorrect fuel value from adding without recalibration.

 

I have them on a 2010 road glide rinehart slip on with a/c bike runs much better. But they do kick out @ half throttle. Witch u can notice

 

Xied's do exactly what they say they will and should be on every stock and stage one bike IMHO.

The only "drawback" that I can think of in the newer bikes ('09 and up) is that those bikes can't be as richened as the earlier bikes. I believe they can be made to go to an air/fuel ratio of something like 14:1 instead of the earlier bikes modified air ratio of something like 13.7:1. Both of these are better than the stock bikes 14.7:1.

Do some reading over at nightrider's site: http://nightrider.com
and the sister site: http://tuneyourharley.com/biketech/

 

As others have basically stated, the XIEDs only modify the O2 sensor signals which only enrich the cruise range, they do not adress the need for more fuel across the entire map. They are what they are, a simple voltage splitter, you can not tune with them, they are very low budget, low tech approach to basically cool your motor and partially accomodate the addiononal fuel requirement after adding free flowing induction/exhaust. I am skeptical of any claims of improved responsiveness, leaner is more responsive, a lean charge burns faster, faster burn = more responsive.

 

I don't know of a negative impact XIED'S have on a new bike. They do what they are designed to do. I've been running them with stage 1 setups on three touring bikes with good success. Go to tuneyourharley.com. They explain the ECM in detail. In the chart you can see how the ECM works in closed and open loop. They work for me because 98 percent of my riding is in the closed loop from idle to around 3750 RPM'S. You see what I am running in my sig pic. If you plan to install cams or big bore kit, I wouldn't recommend them. Steve Mullen at Niterider.com says a lot of his clients use them on totally stock bikes.

 

I have the vieds on my 2010 FLHTK along with an Arlen Ness big sucker and some screamin eagle slip-ons. My bike runs great. Less heat than without and it just seems to run "smoother". I also just cruise about 95% of the time so they are really working like they are designed to do.

 

This is by no means a thread jacking, but a question that SIU 96 will soon have if not already and it is, are they really as easy to install as it looks? Seems very simple and straight forward. And I agree, I don't think I have read anything negative about them anyplace.
Kris

 

I have them on my bike and they work as advertised. Call Steve up and talk to him, very knowledgeable and won't tell you a bunch of bs.

 

No negatives here either. They do exactly as they are supposed to.
RonP42 gave some great advice that I think should be mandatory for anyone considering changes to their stock motor. Far too many expect (or even claim) power increases from these. They weren't designed for that. They simply decrease the AFR in closed loop mode thereby richening the mixture as fabrik8tor says.