| Author | Message | ||
     Drkside79 |
I get really bad MPG on my City X in the 30s any thoughts? | ||
| Mnbueller |
I see you have a 2008. How many miles are on it? Good chance its still just getting broken in. Other factors, tire pressure, speed, speed consistancy...Not sure if it applies to the 08's or not but I remember reading some posts about poor milage and needing new ECM calibrations....someone else will correct me. If you are past break-in swithcing to synthetic oil will help a little bit. | ||
| Froggy |
Get your dealer to connect the Digital Technician and check for a new ECM calibration. It appears the newer ones resolve some drivability issues and can improve fuel economy. (Message edited by Froggy on June 24, 2009) | ||
| 1_mike |
Some don't believe that ignition timing effects - 1. Exhaust heat 2. Driveability 3. Power 4. Mileage Well, I added a (as I said at another location) boatload of timing a coupla weeks ago to my XB12, along with just a tiny amount of fuel. 1. The power went up (butt dyno) 2. The driveablity went up, pulls good from about 2000rpm. 3. Don't need two layers of ceramic tape on the headers any more. 4. It went from 46-48mpg to a solid 51-52mpg, (the exact same route back and forth 85 miles a day, checked several days). Go into the ECM and add timing. Especially from 1000rpm to 4000rpm. It works... Check for detionation to verify you didn't add too much. If....for some reason...you don't like it....you can always put it back to where it is now and suffer. Mike (Message edited by 1_mike on June 24, 2009) | ||
| Js_buell |
What's your millage on it as of now? My 09 just started to get better at around 5k Mi | ||
| Drkside79 |
2000 | ||
| 1_mike |
Js - Mileage should'nt make much difference these days. Your engine's for the most part, broken in by 750 or 1000 miles...max.. They aren't like they built or use the same materials like they were in days (years) past. For the record, the 51-52 mpg was at 7200+ miles. At 7500+ now. Mike | ||
| Tomzhog |
I'm currently getting 48-51mpg solid running 50 miles round trip got pulled last week doing 92 Went on almost 600 mile round trip memorial day weekend got 54-55 mpg riding 2up w/ saddle bags tank bag back pack on my 95lb girlfriend You really can't ask for better than that | ||
| Boltrider |
A 9 in the 30's? Something ain't right. | ||
| Gbalias |
i absolutely without a doubt DO NOT recommend adding timing till it knocks, then back it down a bit. if you have trouble wrapping your head around the science and process of whats going on in there best to take it to a professional to do a tune for you. if all that heat is not in the headers anymore after adding a bunch of timing, its being directed to the piston hats and rings. youll be getting a lot less miles out of the life of your motor this way. give us a heads up after about another 20K. | ||
| 1_mike |
Gb - Heat in the header does "nothing" for mileage, for power, for driveability..! The heat needs to be doing its work in the combustion chamber, pushing down on the piston to do any thing good...NOT heating the outside air..! If your knocking comment was from my post...that "WAS" a cautionary note to more of a beginner. A "little" pounding on a forged piston won't hurt anything. Of course...this does presume that the driver can hear it and turn around and go home and try again! Common sense should prevail. Mike | ||
| Gbalias |
sorry....let me clarify.. lets consider this heated air as a single volume in the "combustion pipeline" ....the heat is being moved either upstream or downsream in the process by when the ignition occurs. the point here is to balance a safe OT, and amount of timing and still maintain max TQ. you probably shouldnt be seeing more than 1550EGT for prolonged time. the knocking statement was aimed at attempting to shy inexperienced tuners from thinking that its safe to advance till knock, then back it down a few degrees. its just plain the wrong way to create a timing map. its still gonna be putting more pressure than designed for in the long run. forged internals or not. i hate for people to destroy their engines. | ||
| Eicas |
My '08 XB12Ss averages 50 mpg on my 80 mile round trip commute to work that consists of 60 miles freeway running at around 70 mph and the other 20 on city back roads with 9 traffic lights. Mods consist of the breather reroute and a SS Drummer. In mixed driving I now average in the mid 40's, and in just around town it is in the upper 30's. When new I never got much above 40 mpg for the first 2,000 miles no matter what I did, I am now coming up on 5,000 miles. |
