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what to do what to do

its being built for texas mile top speed runs

+ or minus teeth idk help plzzzzz
There's no way of knowing unless you tell us the power output at the very least. Where the engine makes peak horsepower would be important as well.
If it's a totally stock bike there's little point in changing the gearing at all. If there's a headwind on the day you may find it worth going up a tooth on the rear I guess.
 

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i think +1 front -1 rear will get top speed but lower torque
+1/-1 would seriously _reduce_ the top speed unless it's got significantly more power than stock to be able to pull such high gearing.
Stock 16/43 would theoretically pull around 290kph or 177mph depending on tyre/surface traction.
17/42 could _possibly_ push it over 300kph (186mph) _if_ you have a _lot_ more power. With stock-ish output it might still be able to pull to peak power in fifth but changing to sixth would would drop it below peak power and you'd start losing speed.
 

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Any changes to the aerodynamics will also have a large effect on your top speed.
 

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+1/-1 would sereiously _reduce_ the topspeed unless it's got significantly more power than stock to be able to pull such high gearing.
Stock 16/43 would theoretically pull around 290kph or 177mph depending on tyre/surface traction.
17/42 could _possibly_ push it over 300kph (186mph) _if_ you have a _lot_ more power. With stock-ish output it might still be able to pull to peak power in fifth but changing to sixth would would drop it below peak power and you'd start losing speed.
Are you sure stock is 16/43? :huh: I thought it is 16/42 on the 954.:confused:
 

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Why is that blade, do you know?:huh:
I have absolutely no idea :)
Maybe they wanted to toss a little more optimistic speedo error in?
Maybe air pollution creates more drag up there?
Maybe they get less power out of the US fuels?
 

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Discussion Starter #10
no its no where near stock has track plastics as soon as i find the dyno sheet ill post it its making well over 300 now
 

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no its no where near stock has track plastics as soon as i find the dyno sheet ill post it its making well over 300 now
I reckon around 220hp should just about break 200mph.
Probably around 450-500hp would pull to 250mph.
300hp should be good for 210-215mph at a wild guess.
You'd have more idea than me though - what speeds are other bikes pulling with their power outputs?
Depending on how much you can limit tyre slip (is it run on bitumen?) you'd probably be looking at something like 18/38 or thereabouts. What gearing are others running?
 

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Bladeracers comment on aerodynamics are even more relevant if your kicking out 300hp. I recomend doing it in your pants(not trousers-UK) like rolly free(that was a joke!)
I think they've got kak fuel in the US 85 or 90 octane or something.
 

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I think they've got kak fuel in the US 85 or 90 octane or something.
US octane numbers are lower than ours because they use a different measuring system.
 

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Interesting, I didn't know that. Is Oz the same as Britain? We get 95 as normal and 97 and rarer 98 as the good stuff at about 10% more, today £1.10/litre for 95 and £1.20 for 97. I used to run all my bikes on 97, but since it's gone up it's just the two strokes and the husky that I use it in.
Oh and there's some tie up between ferrari and shell(i think) which is looney money, but available on the forcourt(I think it's designed for stock brokers, rather than combustion chambers) at something like £2/litre!
 

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Interesting, I didn't know that. Is Oz the same as Britain? We get 95 as normal and 97 and rarer 98 as the good stuff at about 10% more, today £1.10/litre for 95 and £1.20 for 97. I used to run all my bikes on 97, but since it's gone up it's just the two strokes and the husky that I use it in.
Oh and there's some tie up between ferrari and shell(i think) which is looney money, but available on the forcourt(I think it's designed for stock brokers, rather than combustion chambers) at something like £2/litre!
Here our standard is 91RON (US is 87MON I think?), Premium is 95RON and the good stuff is 98RON. We only run 98 in all our vehicles.
Today 91 is A$1.16, 95 is A$1.26 and 98 is A$1.31.
 

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Good luck with them then. They all speed here and kill more pedestrians than the population for the amount of miles they drive, but doesn't stop 'em from nicking us for 33mph in a 30!
I'm in construction thanks, for the link bladeracer. :)
 

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Good luck with them then. They all speed here and kill more pedestrians than the population for the amount of miles they drive, but doesn't stop 'em from nicking us for 33mph in a 30!
I'm in construction thanks, for the link bladeracer. :)
Me too, I'm a roof carpenter. I had a young fellow working for me in '99 who'd just arrived from Golspy, Scotland. He and his wife (she was an accountant) both claimed they were earning twice as much and the cost of living was halved but I don't know how accurate that was. They bought a house on the coast pretty much right away though :)
 
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