| Author | Message | ||
     Deanbush |
I ride my bike 2006 XB12ss year around,and in the cold 30 -40 degrees I am getting approx 4mpg less than summer riding. I have removed RSS and still engine is running rich and the exhaust fan comes on sometimes, so I reinstalled RSS and blocked half of the scoop off and still runs rich and the fan still comes on sometimes. Does anyone modify fuel map with ECM SPY to cure this or does anybody have any suggestions. | ||
| Ikeman |
I'm willing to bet it's not running rich. Given the same volume of air going into the cylinders the colder air is more dense (more oxygen molecules) than warm air. More oxygen means more fuel to maintain the same air:fuel ratio. More fuel = less mileage. On the upside - more fuel/air = more power! I love riding in cooler temps  | ||
| Jlnance |
It could be a couple of things: - Gasoline formulation changes between winter and summer. - Combustion is less efficient when the engine is cooler. - Takes longer to warm the engine up http://www.cartalk.com/content/columns/Archive/199 7/March/01.html | ||
| Punkid8888 |
+1 to what Jlnance just said | ||
| Mmcn49 |
I'm a year round daily commuter near Seattle. My commuting bike is a 72 R75/5 BMW. It has about a 6.5 gallon tank with around a 1 gallon reserve. In the summer I can commute 8 days before hitting reserve. In the winter it’s about 7. | ||
| Socalbueller |
That is about the same for me in Los Angeles. I get about 4-6 mpg less in the winter than the spring, summer, or fall. | ||
| Moosestang |
My fan almost never runs when it's cold. Not even after my 15 mile commute home, 3-4 mile drive through my neighborhood at about 45mph and stopping twice for stop signs. Am I the only one who's fan doesn't run often? Maybe the 12 runs hotter? | ||
| Froggy |
I had to use ECMspy to check my fan last night moose, lol  | ||
| Iamarchangel |
I've noticed that runs of less than half an hour in temps in the low teens (C) don't trigger the fan. I usually run at about 4200 rpm. I would expect lower mileage in colder weather for many reasons. (Message edited by Iamarchangel on November 21, 2008) | ||
| Fireboltwillie |
25 lbs of extra clothing, for one. | ||
| Moosestang |
I had to use ECMspy to check my fan last night moose, lol : ) Is it just me or is the fan louder when testing with ecmspy? Scared the crap out of me the first time I tested it. | ||
| Htekwo |
Ikeman is correct. Do some reading on Air Fuel ratios and cold weather. As stated, in the cold, the amount of fuel added to the denser air must increase for the relative A/F ratio to remain the same. If you lean out the mixture, you risk detonation and engine damage, usually resulting in cracked ringlandings or bent rods or both. | ||
| Deanbush |
I agree. with both Ikeman & Jinance. I start out running 45mph first 10-15 min,approx 5 miles. Then freeway running 70-80mph 15-20 min,approx 12 miles. Then approx 5 miles at 45mph. I did the above to see if I could get the engine to run and heat up faster, and in both conditions the fan would come on approx 75% of the time. I just did the 10,000 mile service and the spark plugs are both black and dry at the base. I also found the rear spark plug wire crimped on connector was rusted and the retainer ring was broken into. I cleaned up connector and and put conductive grease on it and the new NGK Iridium plug just to test run engine. I have ordered a new set of wire's from Al at American Sport Bike. When I reinstalled the rear plug wire I noticed that the wire starts bending at approx 80 degrees right where the spark plug boot begins and this causes a small gap between the wire and boot. I will seal this area on both new wires when I receive them, just thought you would like to know about this potential problem and if anybody else has come across the this. Thanks, Dean Bush |
