Hayabusa genuine top speed?

[Edbear]

I've been wasting a bit of time watching video of the Bus and one of the latest on the 2011 model showed him clocking the speedo at 185mph, changing into 6th and watching the revs increase to 11,000rpm, which of course means he was still increasing speed. I thought they were all speed restricted to 300km/h, or 186mph and was wondering about how much speedo error was involved. Has anyone worked out mathematically, the top speed at max revs?

I don't know the gearing ratio or the formula to work it out.

[slofox]

I've been wasting a bit of time watching video of the Bus and one of the latest on the 2011 model showed him clocking the speedo at 185mph, changing into 6th and watching the revs increase to 11,000rpm, which of course means he was still increasing speed. I thought they were all speed restricted to 300km/h, or 186mph and was wondering about how much speedo error was involved. Has anyone worked out mathematically, the top speed at max revs?

I don't know the gearing ratio or the formula to work it out.

You need gear ratio and wheel diameter to work it out. Plus an estimate of slippage at the back wheel (hard to get accurate).

[Edbear]

Found this on the 2011 model.
Primary reduction ratio: 1,596 (83/52)
Gear Ratio:

•Low: 2,615 (34/13)
•2nd: 1937 (31/16)
•3rd: 1526 (29/19)
•4th: 1285 (27/21)
•5th: 1136 (25/22)
•Maximum: 1,043 (24/23)
Final reduction ratio: 2,388 (43/18)

Wotsitmean..?

[slofox]

Found this on the 2011 model.
Primary reduction ratio: 1,596 (83/52)
Gear Ratio:

•Low: 2,615 (34/13)
•2nd: 1937 (31/16)
•3rd: 1526 (29/19)
•4th: 1285 (27/21)
•5th: 1136 (25/22)
•Maximum: 1,043 (24/23)
Final reduction ratio: 2,388 (43/18)

Wotsitmean..?

In the olden days we used x:1 ratios...

[Edbear]

And this is the rear tyre size.
Rear tire size: 190/50 ZR 17 M / C (73 W), tubeless

[Edbear]

Hmmmm.... I think I have not done this quite right...

http://www.apexgarage.com/tech/gear_ratios.shtml

325mph doesn't seem correct. I entered 11,000rpm, OD of 24.72in for the tyre and used the figures as if they were 1.043 6th gear ratio, and 2.388 as final drive.

[Gremlin]

Initially, I thought the wizard was shit... I got most gears as 0, and 6th as 1...

More playing, and changing the wheel to 17, I got 357kph...

No wonder I don't have one

[Edbear]

Initially, I thought the wizard was shit... I got most gears as 0, and 6th as 1...

More playing, and changing the wheel to 17, I got 357kph...

No wonder I don't have one

Das' funny, what did you enter?

[Edbear]

Oh, I thought they wanted OD for the tyre, not wheel diameter.

[YellowDog]

When I was in the UK, within a month of a new model being launched, there would be a derestriction service being advertised.

357kph is a little faster than I would want to travel in/on any non-airborne craft

[DEATH_INC.]

Hmmmm.... I think I have not done this quite right...

http://www.apexgarage.com/tech/gear_ratios.shtml

325mph doesn't seem correct. I entered 11,000rpm, OD of 24.72in for the tyre and used the figures as if they were 1.043 6th gear ratio, and 2.388 as final drive.

You're missing the primary reduction ratio.... (edit: maybe not....)

[DEATH_INC.]

I get 220.8mph (or 353kph),calculating it the old fashioned way, using your measurements. Not a chance that they're that fast.

[kiwifruit]

In 2008 I did a few runs at a timed flying 1/4 mile event on a 2004 busa with pipes, power commander and filter. Stock gearing. I was 88kg in my gear at that time.

At a whisker off redline in top (11,000) it was indicating between 340 and 350. Actual speed was 299kmh if I recall correctly. May have been 297.

http://www.youtube.com/watch?v=JeO2Br6iMRg

[scumdog]

Ghost rider (or whatever his name is/was) was getting 299kph out of his all the time...

[Edbear]

I get 220.8mph (or 353kph),calculating it the old fashioned way, using your measurements. Not a chance that they're that fast.

Well the rev counter was on 11,000, so I would expect that to be reasonably accurate and this is the stock gearing from the spec sheet...

The original '99 unrestricted version with 155hp was clocked at Avalon airstrip in Aus at 311km/h, the '08 onwards versions have 175hp. This partiucular bike must have been deresricted from the 186mph limiter.

http://www.youtube.com/watch?v=NQd1ffDsJsc