Woot New Toy. 2002 Yamaha R1 Pictures!

[gimp]

When the front wheel is going up, that's energy that should be used to make you go forward. Your not applying the power of the bike effectively. That's how I always thought of it

[slade]

When the front wheel is going up, that's energy that should be used to make you go forward. Your not applying the power of the bike effectively. That's how I always thought of it

so that reduces your efficiency, not your acceleration - acceleration is what causes the front end to lift anyway, so the acceleration has to be greater if the front end lifts than if it doesnt. (this is assuming everything else, e.g., center of mass, is constant.)

[FlawleZ]

so that reduces your efficiency, not your acceleration - acceleration is what causes the front end to lift anyway, so the acceleration has to be greater if the front end lifts than if it doesnt. (this is assuming everything else, e.g., center of mass, is constant.)

Actually weight transfer is the direct cause of lift and is a direct byproduct of extreme acceleration. You would also want both wheels on the ground from an aerodynamic perspective as well.

[Spartan X]

From what I understand on a drag strip when you are trying to get max times you will let the front wheel come up as long as you can control it and it is within the riders ability. The only wa to stop the front weel frm comign up is to ease off on the throttle=Going slower.

List on know changed from stock:

Fender eliminator, Dual Devel Pipes, CF wind screen, CF clutch and brake handle, CF T bar, Pilot Tires, and....I think tyats it. no performance ups besies the pipes I think


So what exactly does the Powercomader give you? I know what it is, but what are the benifits/disivantages

[slade]

Actually weight transfer is the direct cause of lift and is a direct byproduct of extreme acceleration. You would also want both wheels on the ground from an aerodynamic perspective as well.

weight transfer? what weight is being transferred? there are three forces on the bike, negating air resistance. gravity, a force applied at the rear wheel, and the normal force against the ground. the force on the wheel produces a torque on the system about the center of mass. if torque is enough to overcome gravity, the front end of the bike lifts.

aerodynamics is a potential factor, but at low speeds (when the bike would be accelerating enough for the front wheel to lift) air resistance would be of negligible effect.

*edit*

From what I understand on a drag strip when you are trying to get max times you will let the front wheel come up as long as you can control it and it is within the riders ability. The only wa to stop the front weel frm comign up is to ease off on the throttle=Going slower.

exactly.

[trevorjk]

from what i understand the yamaha R1's electronic control system limits the bike from getting its full potential.

the power commander pretty much takes limits off the bike. and also helps with the fuel consumption. think of it as remapping your electronic controls.

the power commander adds 5-10hp and adds ALOT more midrange over stock. and all around adds more power through out the powerband and at lower rev's <- this i know for sure as i have experienced it first hand.

[skife]

from what i understand the yamaha R1's electronic control system limits the bike from getting its full potential.

the power commander pretty much takes limits off the bike. and also helps with the fuel consumption. think of it as remapping your electronic controls.

the power commander adds 5-10hp and adds ALOT more midrange over stock. and all around adds more power through out the powerband and at lower rev's <- this i know for sure as i have experienced it first hand.

so it probably just changes the fuel maps.


nice bike man.

its probably possiable to hit 200 on that thing stock with some re-gearing.
it'll throw your speedometer off, but would definatally do the trick.

[gimp]

Yeah, a power commander lets you change fuel maps. You can download maps for your specific pipes usually too. Or if you've got some money, take it to a shop and have them put a custom map on it. There all a bunch of add ons you can get for the power commander too. I saw the quickshifter the other day first hand. You don't have to crack the throttle on clutchless upshifting, you just hold it wide open and hammer through the gears.

The powercommander can help, or hurt your fuel consumption, it all depends what you put on it for a map.

[Spartan X]

Well basically what the power commander does from what I know is it just adjusted the leanes and richness of the fuel going into the engine, just like adusting a carb, or or idle, just through-out the range of your revs. Persnally if I got it mapped I'd go for the most fuel efficiant setting and not performance, cause I bought it for commuting and having fun...commuting first lol.

[slade]

what efficiency are you getting with it?

[Spartan X]

Well what I did was I filled my tank up as soon as the Low gas lite came on and put exactly 3 gallons in it, then I reset the trip meter and when it came back on I was at 115 miles so that measn I got about 38.5 miles to a gallon on those 3 gallons...I heard racing it gets you 30 mph and Driving it like a scooter will get you 50 so that sounds about right.

[FlawleZ]

weight transfer? what weight is being transferred? there are three forces on the bike, negating air resistance. gravity, a force applied at the rear wheel, and the normal force against the ground. the force on the wheel produces a torque on the system about the center of mass. if torque is enough to overcome gravity, the front end of the bike lifts.

aerodynamics is a potential factor, but at low speeds (when the bike would be accelerating enough for the front wheel to lift) air resistance would be of negligible effect.

*edit*


exactly.

I'm sorry man but your weak attempt at phsyics is quite confused.

Newton's 2nd law of physics applied to our situation:
When a force is applied to a car, the change in motion is proportional to the force divided by the mass of the car.



Lf is the lift force exerted by the ground on the front tire, and Lr is the lift force on the rear tire. These lift forces are as real as the ones that keep an airplane in the air, and they keep the car from falling through the ground to the center of the Earth.

Weight transfer is measured by the braking force and can be measured in acceleration as negative braking force.

Now this example was setup for a car, but its fundamentally the same for a bike.


I suggest you do some reading man.

[Spartan X]

I'm sorry man but your weak attempt at phsyics is quite confused.

Newton's 2nd law of physics applied to our situation:
When a force is applied to a car, the change in motion is proportional to the force divided by the mass of the car.



Lf is the lift force exerted by the ground on the front tire, and Lr is the lift force on the rear tire. These lift forces are as real as the ones that keep an airplane in the air, and they keep the car from falling through the ground to the center of the Earth.

Weight transfer is measured by the braking force and can be measured in acceleration as negative braking force.

Now this example was setup for a car, but its fundamentally the same for a bike.


I suggest you do some reading man.

He may have explained it wrong maybe but he was still right lol, that Popping a wheeling off the line will give you a better time then keepoing the front wheel down...which the ONLY way to do that is to go slower, or have a drag bar/extended rear.

[FlawleZ]

He may have explained it wrong maybe but he was still right lol, that Popping a wheeling off the line will give you a better time then keepoing the front wheel down...which the ONLY way to do that is to go slower, or have a drag bar/extended rear.

Naturally, with a great power to weight ratio, you will generate enough uplift to to wheelie reguardless. The challenge is finding the perfect rpm and and clutch release to make as much power as possible while still keeping the weight of the bike towards the front as much as possible. For very fast bikes, this is only accomplished with a wheelie bar and stretched frames and extended swing arms. Of course lowering and strapping the bike is essential with mildly modified street bikes.

[slade]

I'm sorry man but your weak attempt at phsyics is quite confused.

Newton's 2nd law of physics applied to our situation:
When a force is applied to a car, the change in motion is proportional to the force divided by the mass of the car.



Lf is the lift force exerted by the ground on the front tire, and Lr is the lift force on the rear tire. These lift forces are as real as the ones that keep an airplane in the air, and they keep the car from falling through the ground to the center of the Earth.

Weight transfer is measured by the braking force and can be measured in acceleration as negative braking force.

Now this example was setup for a car, but its fundamentally the same for a bike.


I suggest you do some reading man.

uhh... what?

you didnt really even say anything in that post. you verbally restated F=ma as a=F/m.

then you use a diagram to talk about lift forces on the tires. okay, sure, as you defined it, a "lift force" is a normal force between the ground and the tire, which is specific to this situation. the terminology really doesnt matter. and your comparison is weaker than a honda nighthawk. the "lift force" you described in this situation has nothing to do with an airplane. An airplane doesn't fall out of the air because the coanda effect produces lift as the air flows over the curved wing. the car doesnt fall through the ground because... well, the wheels are on the ground.

and then you used the term weight transfer again, without even defining it. the term implies that weight is being transfered, which would effect the acceleration needed to lift the front wheel (for example, if the rider leaned forward or backward). what you were referring to is the redistribution of weight on the tires due to acceleration.

which is... exactly what I explained, without using the term "weight transfer". the bike accelerates, applying a force at the rear wheel. this force is behind and below the center of mass of the bike. that force will exert a torque on the bike, and if the acceleration is great enough, the front wheel will lift. if you care to rephrase that, you could easily say that a torque applied at the rear wheel will cause the distribution of force due to gravity on the vehicle will shift from the front wheel to the rear wheel, and if the force shifts completely the front wheel will lift. my explanation explains yours. if you cared do, and had all the correct values, you could set up a simple physics equation to calculate the force required on a certain bike to lift the front wheel.

my explanation is fundamentally the same as yours, except its not grounded in one scenario, and i didnt just copy it from a website. my explanation accounts for why a rear wheel drive vehicle can do a wheelie. it also accounts for why a front wheel drive vehicle cannot do a wheelie, and how the front of a hard-breaking vehicle will "dive", or how a vehicle that stops very hard can do an endo, and why, theoretically, if you strapped a rocket to the back of your car above its center of mass, your car could not do a wheelie. but you apparently didnt understand my post enough to get that.