OEM sprockets vs. +1/-2
#1
OEM sprockets vs. +1/-2
Can't find the answer I'm looking for, so i'll post a new thread. My fuel economy is less than 30mpg. it might be my air filter, which someone suggested previously, but I also have the sprocket conversion done to my bike from the previous owner. Would this upgrade reduce my fuel economy a bit? I know it gives me lower-end torque but unsure if that is detrimental to my mpg. I'd like to have the bike up to the estimated 39mpg fuel efficiency if i can help it I'm not stunting this bike and don't think 'll need the conversion if its going to raise my fuel consumption by 8-10mpg.
#4
#5
Heres some quick numbers.
Stock gearing - 16/46 = 2.875 final drive ratio
Your gearing - 15/48 = 3.2 final drive ratio
3.2/2.875 = 1.11 So your engine will have to turn at 11% more times to travel the same distance as stock gearing, meaning approximately 11% more fuel consumption(its actually a little more because engines run less efficient at higher rpms) If you are currently getting 30 mpg, I would expect you would get at least 30 / (1-.11) = 34 mpg with stock gearing.
I have no experience with this in the real world, just messing around with numbers.
Stock gearing - 16/46 = 2.875 final drive ratio
Your gearing - 15/48 = 3.2 final drive ratio
3.2/2.875 = 1.11 So your engine will have to turn at 11% more times to travel the same distance as stock gearing, meaning approximately 11% more fuel consumption(its actually a little more because engines run less efficient at higher rpms) If you are currently getting 30 mpg, I would expect you would get at least 30 / (1-.11) = 34 mpg with stock gearing.
I have no experience with this in the real world, just messing around with numbers.
#6
I highly doubt it will raise fuel economy 8-10mpg.
(17/44) / (16/46) = 1.11
Therefore when your on the highway you should gain about 11% fuel economy in theory so if your getting 30mpg you will get about 33mpg.
Edit: Kind of got beat to it.
(17/44) / (16/46) = 1.11
Therefore when your on the highway you should gain about 11% fuel economy in theory so if your getting 30mpg you will get about 33mpg.
Edit: Kind of got beat to it.
Last edited by jeffjones; 06-29-2011 at 03:34 PM.
#7
boost fuel economy?
is anyone out there running taller gears to try and boost fuel economy or for other reasons? if so what kind of mpg are you getting? i have stock gears and get 45-50 mpg on my 2002 F4i. im shocked to hear someone only getting 30 mpg but maybe its all city driving or something.
#8
#9
Below 40mpg when the bike is being ridden easily means there is something wrong. How many miles on the bike?
#10
is anyone out there running taller gears to try and boost fuel economy or for other reasons? if so what kind of mpg are you getting? i have stock gears and get 45-50 mpg on my 2002 F4i. im shocked to hear someone only getting 30 mpg but maybe its all city driving or something.
I would say Im more shocked to hear 50mpg thn 30mpg