Speed de-restriction on Fireblade 2008 ??? - Honda Motorcycles - FireBlades.org
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post #1 of 10 Old 06-07-2011, 8:28 AM Thread Starter
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Speed de-restriction on Fireblade 2008 ???

I just did a ride with a 2008 Fireblade and was surprised getting just 275 km/h on top and no more.
Is it any way to de-limit the speed on my bike?

Last edited by vjs; 06-07-2011 at 9:34 AM.
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post #2 of 10 Old 06-07-2011, 10:43 AM
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Re: Speed de-restriction on Fireblade 2008 ???

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Originally Posted by vjs View Post
I just did a ride with a 2008 Fireblade and was surprised getting just 275 km/h on top and no more.
Is it any way to de-limit the speed on my bike?

How did you measure your speed?
How much faster were you expecting to go?

"I won't forget that ride for a while. Maybe you're right. Living fast might be worth the final crash. Maybe that's the secret you fliers know." - Flight of the Intruder
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post #3 of 10 Old 06-07-2011, 1:20 PM
 
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Re: Speed de-restriction on Fireblade 2008 ???

Were you in sixth gear with it redlined? Inquiring minds want to know.

Gearing Commander: Motorcycle Speed, RPM, Chain & Sprockets Calculator
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post #4 of 10 Old 06-07-2011, 1:46 PM
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Re: Speed de-restriction on Fireblade 2008 ???

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Originally Posted by keifin View Post
Were you in sixth gear with it redlined? Inquiring minds want to know.

Gearing Commander: Motorcycle Speed, RPM, Chain & Sprockets Calculator


The calculator only tells you _theoretical_ speeds _if_ the wheel makes the same number of revolutions per kilometer. Once you start pushing big air the tyre slips more and more, increasing the revolutions per kilometer, which costs you speed.
Cruising at 60kph the tyre is barely slipping at all so it is making approximately 500rpkm (assuming 2.000m circumference) at 500rpm. As you increase speed and aerodynamics come into play, the tyre needs to work much harder to push the bike so it starts slipping against the road surface. Other variables like wind direction and speed, surface traction, temperature, acceleration, etc all make the tyre work harder and slip more. At a genuine 240kph when you might be getting 5-10% tyre slip, the wheel is rotating at 2000rpm and 525-550rpkm - so your speedo (which does nothing more than count the wheel revolutions - the gearing calculator does the same) would be measuring 252-264kph - the 2.000m tyre is covering 1050-1100 meters per 1000 meters travelled. At a genuine 270kph you might be getting 15% slip so your indicated speed would be 310kph. This is why a tailwind will give you a higher speed, less load the tyre has to push against so less tyre slip.

"I won't forget that ride for a while. Maybe you're right. Living fast might be worth the final crash. Maybe that's the secret you fliers know." - Flight of the Intruder
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post #5 of 10 Old 06-07-2011, 2:24 PM
 
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Re: Speed de-restriction on Fireblade 2008 ???

So using the calculator to find theoretical top speed at rpm,
a two mile downward grade and gps should give me some useful numbers
to start with? Or would you recommend a different route?
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post #6 of 10 Old 06-07-2011, 2:32 PM
 
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Re: Speed de-restriction on Fireblade 2008 ???

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Originally Posted by bladeracer View Post
The calculator only tells you _theoretical_ speeds _if_ the wheel makes the same number of revolutions per kilometer. Once you start pushing big air the tyre slips more and more, increasing the revolutions per kilometer, which costs you speed.
Cruising at 60kph the tyre is barely slipping at all so it is making approximately 500rpkm (assuming 2.000m circumference) at 500rpm. As you increase speed and aerodynamics come into play, the tyre needs to work much harder to push the bike so it starts slipping against the road surface. Other variables like wind direction and speed, surface traction, temperature, acceleration, etc all make the tyre work harder and slip more. At a genuine 240kph when you might be getting 5-10% tyre slip, the wheel is rotating at 2000rpm and 525-550rpkm - so your speedo (which does nothing more than count the wheel revolutions - the gearing calculator does the same) would be measuring 252-264kph - the 2.000m tyre is covering 1050-1100 meters per 1000 meters travelled. At a genuine 270kph you might be getting 15% slip so your indicated speed would be 310kph. This is why a tailwind will give you a higher speed, less load the tyre has to push against so less tyre slip.
Wow, it's simple physics, but Dude you are the Science Guy. And I mean that in a good way, with the utmost respect. Bladeracer, these points you make are spot on, but folks (like me) forget to factor them in.
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post #7 of 10 Old 06-07-2011, 2:37 PM
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Re: Speed de-restriction on Fireblade 2008 ???

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Originally Posted by keifin View Post
So using the calculator to find theoretical top speed at rpm,
a two mile downward grade and gps should give me some useful numbers
to start with? Or would you recommend a different route?


Yes, but use your own accurate measurements. Calculate tyre circumference from its rolling radius with you seated on the bike. Measure down on both sides from the centre of the axle to the ground. The average of both measurements is your tyre's rolling radius. Mulitiply by two then mulitply by Pi to get the rolling circumference of the tyre.
If you have a two-mile road you can use then you don't need GPS. Measure the last 100 meters where you are reaching peak speed and mark the road. Time yourself across that stretch to know your accurate speed. Ideally use a laptimer like the XT with two triggers exactly 100 meters apart. Two bicycle speedometers mounted on each wheel will show you the differences between both wheels at different speeds to see how much slip is a problem.

"I won't forget that ride for a while. Maybe you're right. Living fast might be worth the final crash. Maybe that's the secret you fliers know." - Flight of the Intruder

Last edited by bladeracer; 06-08-2011 at 1:11 AM.
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post #8 of 10 Old 06-07-2011, 3:47 PM
 
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Re: Speed de-restriction on Fireblade 2008 ???

I do have a gpx pro...........
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post #9 of 10 Old 06-08-2011, 1:12 AM
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Re: Speed de-restriction on Fireblade 2008 ???

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Originally Posted by keifin View Post
I do have a gpx pro...........


Cool.
What's a GPX Pro?

"I won't forget that ride for a while. Maybe you're right. Living fast might be worth the final crash. Maybe that's the secret you fliers know." - Flight of the Intruder
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post #10 of 10 Old 06-08-2011, 8:28 AM
 
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Re: Speed de-restriction on Fireblade 2008 ???

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Originally Posted by bladeracer View Post
Cool.
What's a GPX Pro?
GPX Pro from XT Racing
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