Xied
Cruiser
Joined: Aug 2008
Posts: 222
Likes: 53
From: Lancaster, PA
XIED's
Does anyone have any suggestions on the poor mileage?
Cruiser
Joined: Nov 2007
Posts: 232
Likes: 0
From:
Tire pressure, throttle hand, weight reduction, riding location. You name it, it effects mileage. My 08 UC was getting me 37-39 for the first thousand miles. After a 2500 mile road trip I am in the low-mid 40's bone stock. I shift around 2800-3000 and am pretty conservative on the throttle. For comparison, on my 05 FXST I get around 36 and I run up the tach a bit more in between gears (the noise!). It is a Stage 1 bike with SE slipons and SEAC and a PCIII. I run tires on the high side of pressure, around 41 or so and mostly it is cool around here and I ride in mixed traffic.
Tourer
Joined: May 2008
Posts: 460
Likes: 0
From: Southern Maryland
Okay you asked then I will tell. I don't know if any of the "Modes" I've done is helping or this simple device is actually helping the good MPG on my 07 RKC. I replaced the plugs with the uridium version, XIED's, mod stock exhaust into a true dual and K&N filter. I get mid 40's in the city at times agressive on the throttle and 50's on the highway riding 5th gear until 70+ then again I rarely hit 70mph so 5th gear I ride a great deal and that's when I get 50+ for pmg. The device I speak of are two rare earth magnet they helped on my 98 escort went from mid 20's in the city to low 30's and 35+ mpg on the highway doing 70-80 with a/c running. so I thought I would slap one on my bike, thus far I am a believer that this magnet does something to better the fuel economy.
Intermediate
Joined: Mar 2006
Posts: 44
Likes: 0
From: DFW Texas
OK, even though I really don't have a clue what the best way to achieve best performance, mileage and heat reduction is after reading all those threads.....I went with XIED's only on my 2007 EGC. Nothing else modified...the bike definetly runs MUCH cooler, now the downside is I noticed no real performance gain and I'm still below the average posted here in mileage at 37-38mpg!
Anyone else getting this poor mileage?
Anyone else getting this poor mileage?
Cruiser
Joined: Aug 2008
Posts: 222
Likes: 53
From: Lancaster, PA
Mars, just follow the cable, it's simply tucked down in behind the tranny, no tiedowns or anything, just tug the cable up out of the dark.
Cruiser
Joined: Jul 2008
Posts: 170
Likes: 0
From:
Thanks very much. Rats! Oh well, I'll just have to wait for a while...
Cheers, geeded
Cheers, geeded
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Road Master
Joined: Aug 2007
Posts: 815
Likes: 0
From: GA
The XIEDs make the O2 sensor operate mostly outside its linear band. Don't be surprised if you use them and experience undue fuel usage and/or trouble codes.
The standard IEDs take the fuel ratio to the lowest possible recommended level for reliability concerning the O2 sensors.
Here's an excerpt from the Screamin' Eagle Super Tuner (replaced the SERT) manual:
(emphasis mine)
These devices are merely an external means of adjusting the Closed-Loop Bias table.
The ECM fuel tables use 14.6:1 AFR as the key for closed-loop operation. 14.6 - 0.5 = 14.1 which is what the standard IEDs shoot for. Of course, if you have a SERT or similar already in service, you can do this yourself internally to the ECM. Also consider that it's assumed the factory or stage one downloads use a closed-loop bias which actually shoots for 14.6:1 from the get-go. If for some reason it's already biased toward richer operation, using any of the IEDs can/may take the sensor out-of-range.
If you have a completely factory-equipped bike, either totally stock or all H-D parts with appropriate stage one "download", then the standard IEDs can be a viable alternative to other more costly (though capable) means of making your riding experience a little more friendly.
If you have other breathing parts installed, please look elsewhere to correct your fueling requirements. None of these devices are what you want to be using. I've explained it in painstaking detail in that other thread. Multiple times.
If you use the standard IEDs, look for a reduction in mileage of 3-4%, or from 40 to 38 mpg.
If you use the XIEDs, look for a reduction of about 6% (minimum, on a good day), or from 40 to 37 mpg.
The standard IEDs take the fuel ratio to the lowest possible recommended level for reliability concerning the O2 sensors.
Here's an excerpt from the Screamin' Eagle Super Tuner (replaced the SERT) manual:
(emphasis mine)
These devices are merely an external means of adjusting the Closed-Loop Bias table.
The ECM fuel tables use 14.6:1 AFR as the key for closed-loop operation. 14.6 - 0.5 = 14.1 which is what the standard IEDs shoot for. Of course, if you have a SERT or similar already in service, you can do this yourself internally to the ECM. Also consider that it's assumed the factory or stage one downloads use a closed-loop bias which actually shoots for 14.6:1 from the get-go. If for some reason it's already biased toward richer operation, using any of the IEDs can/may take the sensor out-of-range.
If you have a completely factory-equipped bike, either totally stock or all H-D parts with appropriate stage one "download", then the standard IEDs can be a viable alternative to other more costly (though capable) means of making your riding experience a little more friendly.
If you have other breathing parts installed, please look elsewhere to correct your fueling requirements. None of these devices are what you want to be using. I've explained it in painstaking detail in that other thread. Multiple times.
If you use the standard IEDs, look for a reduction in mileage of 3-4%, or from 40 to 38 mpg.
If you use the XIEDs, look for a reduction of about 6% (minimum, on a good day), or from 40 to 37 mpg.
Now I am not a fuel management expert but the scoot runs cooler and I did seem to get a little chrisper throttle and better overall response than I preceived before.
My bottom line is the bike is better overall than before the XIED install.
Not saying all will experience the same but with my setup that is what I am seeing.
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