As been stated before, save your money and pass on the "ied" devices that simply trick your system. They tend to add fuel across the board (read cells) even when some cells would do much better with less fuel.

And all "tuners" are not the same. Do your homework and find out (1) does your bike actually need one, and (2) which tuner is going to provide the necessary changes in the various table to achieve the performance you seek.

Having some knowledge about tuning and tuning devices will pay off huge in the long run.

Good luck!

 

IMO stay stock. Not many people drag race their Harleys. If you stay stock your warranty remains intact. Also in IMO buy the extended warranty, keep your bike stock and you will never have a problem that will not be fixed for $50.00 and when the 7 years are up buy a new bike. A stock Harley can cruise the highway at 80 mph all day long. Do you really need to go faster than that

 

+1 here Many of us think we'll just do a little stage one and be done but later down the road we want a little
more - I've done that. If you get a Power Vision from Fuel Moto you be good to go regardless with their support
including maps, second bike expansion ability and neat features like speedo adjustment capability. Not a piggy
but a true ECU software manipulation. It also has a narrow band O2 sensor autotune that works well if you go
small changes at a time - just overlay tunes and save your older one too if you want to go back.

 

XIED's... What?... A couple of resistors configured as a voltage divider? What's the price of the resistors? A couple of dollars? Some wire... Some shrink tube... and the connectors. How much to build a set? They sell for what? $100? Sounds like some nice margin there. Believe they got some new ones now... Adjustable... So what's that - a $3 potentiometer?

I don't know... But they seem to be a crude measure. They work by tricking closed loop bias (an hence only work for the closed loop area of the tables). Normally, narrow band O2 sensors provide an average voltage of ~450mV to essentially indicate stoich. If you voltage divide (assuming its a simple voltage divider) the sensors output the sensor has to produce a higher average output voltage to produce the same 450mV on the voltage divers output (what's seen by the ECM). Generally they target an AFR of 14.0. That requires the input to the voltage divider to average somewhere in the neighborhood of 815mV. That figure is pushing the narrow bands beyond their effective range. They are called narrow bands for a reason. Once you get outside the narrow band effective range, other things besides oxygen content can effect their output.

Another consideration... Back in the day... Older tune calibrations used an AFR of 14.6 not only as a target AFR (the entire closed loop region of the AFR table was set to this figure), but also as a software switch to enable closed loop control. The XIED's assume a starting point of 14.6 to produce an actual AFR of 14.0. Wonder if you have a new calibration where HD expanded the AFR range (~ 14.2 to 15.0) that's closed loop? Say you're in a cell that's set to 14.2. Again, assuming that it's a voltage divider, that would require the XIED voltage divider output to be ~800mV. The required O2 sensor output voltage (average) needed on the input of the voltage divider would push the narrow bands well outside their effective range.

For this - and various other reasons (one already mentioned - they enrich all cells whether it's appropriate for any particular cell or not) - one might be better served looking elsewhere.