Forums
New posts
Search forums
What's new
New posts
New media
New media comments
Latest activity
Media
New media
New comments
Search media
Members
Registered members
Current visitors
Log in
Register
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
FJR Motorcycle Forums
Technical & Mechanical Problems
Extremely low MPG
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Help Support Yamaha FJR Motorcycle Forum:
This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.
Message
<blockquote data-quote="torch" data-source="post: 1449013" data-attributes="member: 1295"><p>I can't argue with that. I don't know why the metric standard was flipped from distance/volume to volume/distance, but there it is. The FJR is one of the few vehicles that offers the option of Km/L but I left it the other way because all my other vehicles are that way so I learned to wrap my head around it. </p><p></p><p>From a technical point of view, I'm amazed these things are anywhere close to accurate. The ECU can't directly measure the volume of fuel used. The FJR doesn't even have a MAF. The fuel consumption must be based on totaling the injector pulse width over time* and is subject to manufacturing tolerances, variations between injectors and the fuel pressure applied to the injectors. With 4 injectors at 4,000rpm over, say, 3 hours that's 2,880,000 pulses! A lot of room for error. </p><p></p><p>*I doubt the ECU actually counts individual pulses. Probably uses an average pulse width. But each individual pulse would contribute to any error</p></blockquote><p></p>
[QUOTE="torch, post: 1449013, member: 1295"] I can't argue with that. I don't know why the metric standard was flipped from distance/volume to volume/distance, but there it is. The FJR is one of the few vehicles that offers the option of Km/L but I left it the other way because all my other vehicles are that way so I learned to wrap my head around it. From a technical point of view, I'm amazed these things are anywhere close to accurate. The ECU can't directly measure the volume of fuel used. The FJR doesn't even have a MAF. The fuel consumption must be based on totaling the injector pulse width over time* and is subject to manufacturing tolerances, variations between injectors and the fuel pressure applied to the injectors. With 4 injectors at 4,000rpm over, say, 3 hours that's 2,880,000 pulses! A lot of room for error. *I doubt the ECU actually counts individual pulses. Probably uses an average pulse width. But each individual pulse would contribute to any error [/QUOTE]
Insert quotes…
Verification
Post reply
FJR Motorcycle Forums
Technical & Mechanical Problems
Extremely low MPG
Top