+2 rear sprocket?

[UselessPickles]

For every one that you can find to try to prove your point, I could find 2, and they ACTUALLY Pertain to MOTORCYCLES, but in the end it's just someone else's opinion, or what worked for them on a particular vehicle.

Thanks for bringing up a great point about how readers should think critically about what they read and consider the sources of the information. I can show you a website that swears that the earth is flat.

Let's start with this link you provided: How to get the most mpg from your bike - | Motorcycle Riding Advice | Motorbike Riding Tips

Which claims:

Your bike's engine is working most efficiently at the point it's making peak torque, extracting the maximum possible work from its fuel/air mix.
...
The maximum mileage you can achieve on your bike will be achieved in top gear at the speed at which you know your bike makes its peak torque.

The first part is mostly true, but is irrelevant to the discussion. Yes, at full throttle at peak torque is where your engine is most efficient at converting fuel into TORQUE (not power, which is the ability to do work; a confusing topic). Unless your bike is geared so that it requires full throttle at peak torque to maintain cruising speed, then this info is not helpful. We care about the efficiency of converting fuel into DISTANCE at a given speed, which requires a fixed amount of power to overcome drag at that speed.

The second part should be quite obviously wrong to everyone reading this. Peak torque on the FZ6R is around 8000rpm, so according to this article, I should get best possible fuel economy when cruising at around 90mph in 6th gear. My FJR's peak torque is at 7000rpm, which is over 130mph in 5th gear. The force of aerodynamic drag increases with the square of speed, and really starts to become very significant around 60mph. Cruising at 90mph or 130mph is definitely not going to be the most efficient way of converting fuel into distance traveled.

There's also no sources cited for the info presented in this article.


Your other link (Riding Your Bike For Maximum MPG) not only doesn't cite any sources of info, but also doesn't even attempt an explanation to back up it's claims of accelerating gently to improve fuel economy. It just says to do it.


I linked to articles that have information from "Specialists at Ford, Honda and Toyota", as well as a report on results of a scientific study using software to analyze driving habits and the effects on fuel economy. Both articles also provided logical explanations to help back up their claims.

I'll let the readers choose which is more reputable of the links we have posted.

they ACTUALLY Pertain to MOTORCYCLES

You're right. The fact that motorcycles have 2 wheels instead of 4 causes the universe to decide to change the laws of physics for the 4-cycle gasoline-powered internal combustion engines, the discrete gear ratio transmissions, and the laws of physics for the energy required to accelerate vehicle along the road through the air and also maintain cruising speed. How silly of me to think that the general principals and trends might be the same.

i really am done now

 

[DragonBlu]

In the words of a wise old man "What the hell difference does it make." :surrender:

 

[Nastybutler]

In the words of a wise old man "What the hell difference does it make." :surrender:

A big one, if MPG's are important to you.

 

[Nastybutler]

FWIW, Usless Pickles has always backed up his opinions on all technical topics he discusses with data, often data he himself has generated and analyzed. I'd like to thank both he and ChevyFazer for this entertaining gearheaded nerd battle.

And IMHO, UP's arguments make the most sense with better more credible information. It's nice to know all these years I've been stomping on my gas peddle/ twisting the throttle all the way back have been actually saving me gas. I was always a little guilty about it, but now I can do it and tell my wife it's for the environment! :thumbup:

 

[Marthy]

We're talking about $0.08 vs. $0.10 a mile, $0.02 difference... (50MPG vs. 40MPG @ $4.00/G) Just debating about it is a waste of money...lol

Ah well, life goes on my friend. It was entertaining.

I remember the days (was quite young) when you were hammering the throttle on the freeway and you could watch the fuel gauge go down... Those big 400 C.I. were not MPG friendly...

 

[Chevyfazer]

Thanks for bringing up a great point about how readers should think critically about what they read

I'll let the readers choose which is more reputable of the links we have posted.



You're right. The fact that motorcycles have 2 wheels instead of 4 causes the universe to decide to change the laws of physics for the 4-cycle gasoline-powered internal combustion engines, the discrete gear ratio transmissions, and the laws of physics for the energy required to accelerate vehicle along the road through the air and also maintain cruising speed. How silly of me to think that the general principals and trends might be the same.

I just really can't, I'm too hard headed, so I'm not going to say I'm done after this

http://www.visordown.com/how-to-do-just-about-anything/get-better-mpg-from-your-motorcycle/18993-7.html#historysub

I know this won't be acceptable for you either but I'm posting it anyways, I've probably looked at over 50 articles in the past few days, from reputable motorcycle sources and not one has mentioned going full throttle will give you the best economy, please find one for me. but I guess you must be on to something that decades of riders, engineers, and everyone in between have been missing for all these years...

And yes it does matter about it pertaining to bikes, not because of 2 wheels but because of their weight, and the fact that most have plenty of power to spare. And don't need to go WOT to accelerate quickly. But I guess all 4 stroke engines are the same, so according to you someone driving a Pete 379 powered by a ISX could accelerate WOT until they reach cruising speeds to get the best mpg, but dang they have been doing it wrong all these years too, when mpg is a huge concern to them, who would have known....

 

[Nastybutler]

That last link you gave, Chevyfazer, had nothing to do with acceleration, but staying in the sweet spot. Unless I'm missing something on that page, which was poorly laid out.

 

[Chevyfazer]

It's a 7 page article page 6 begins the part about operating your bike smoothly and continues on, I posted the wrong page #

So here's something from Wikipedia

Acceleration and deceleration (braking)

Fuel efficiency varies with the vehicle. Fuel efficiency during acceleration generally improves as RPM increases until a point somewhere near peak torque (brake specific fuel consumption.[20]) However, accelerating too quickly without paying attention to what is ahead may require braking and then after that, additional acceleration. Experts recommend accelerating quickly, but smoothly.[22]

Generally, fuel economy is maximized when acceleration and braking are minimized. So a fuel-efficient strategy is to anticipate what is happening ahead, and drive in such a way so as to minimize acceleration and braking, and maximize coasting time.

http://en.m.wikipedia.org/wiki/Fuel_economy-maximizing_behaviors

If you read the whole thing it also explains why the same technique can't be applied to every vehicle



If that is not good enough, then nothing will be


Oh and by the way, you really should think about sending in your resume to a NASCAR race team, they would pay you millions for this revolutionary THEORY of yours

http://www.nascar.com/news/110924/dcaraviello-saving-fuel-talent/index.html

 

[Erigala]

-1 up front and +2 on rear

Well, I'll let you guys know tomorrow when I pick my bike up from Yamaha!! Oh.....put a K&N air filter in as well. Makes a huge difference in throttle response.

 

[monstermike4343]

Hi All,

I am thinking about changing out just my rear sprocket for a 48T (+2).

looked at the results on gearingcommander and it will raise my RPM's about 400 at 60mph.

Has anyone done this?

Will I get a little more oomph on take offs?

Thanks and any links to sprockets would be appreciated.

Cheers,
Chris

i have a 14t front and 49t rear and im about 7mph off correct speed