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Author Topic: Busa specs  (Read 10941 times)

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Offline Yoshi

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Re: Busa specs
« Reply #30 on: January 01, 2009, 05:35:17 PM »
Quote from: Masterfabr on January 01, 2009, 05:30:20 PM
Stop thinking.You had it right to start with.
I thought I was right, but I seem to recall someone once saying in the highest gear, your spinning at roughly the same 1:1 ratio as the crank, and seeing a 1.043 ratio for 6th., I started thinking if that was the 1:1 to the crank i'd heard in the past, oh well......
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Re: Busa specs
« Reply #31 on: January 01, 2009, 05:37:02 PM »
My calculated torque is 357.97 so effectively i could gear to my trans input shaft 1.12:1 so i could do a 17/19 sprocket combo and not see more torque than it has been proven to... 400.93
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Offline fabr

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Re: Busa specs
« Reply #32 on: January 01, 2009, 05:37:48 PM »
Quote from: Yoshi on January 01, 2009, 05:30:32 PM
And that's why most people break their drive line off the line, when all the torque is applied to the wheel from a dead stop and you get hella good traction, that's when it's gonna happen, just like twisting the head off a 1/4" bolt with a 2 foot breaker bar......
Depends on traction and how many milliseconds it takes for full tq to be delivered to the shaft.If it happens as all shock you get snapped shaft.If it occurs over a longer timeframe ,such as is accomplished with a cushion drive,(tq converter,cvt), you will have a much tq capacity of the same shaft.Time IS relevant.Off topic ,I know, but relevant nevertheless.
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Re: Busa specs
« Reply #33 on: January 01, 2009, 05:38:40 PM »
How would that alter my final ratio tho? 4.75:1 would i multiply that by 1.12?
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Offline fabr

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Re: Busa specs
« Reply #34 on: January 01, 2009, 05:39:51 PM »
Yep
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

-----------------------------------------------------------
 " You have all the right in the world to believe any damn thing you'd like, but you don't have the right to demand that I agree with your fantasy"

Offline Yoshi

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Re: Busa specs
« Reply #35 on: January 01, 2009, 05:44:12 PM »
ok, I found a chart for the gear teeth, so I know I was right the first time


Transmission Gear Teeth
1st: 34 / 13 (2.6153846 reduction in 1st. after the final drive ratio.)
2nd: 31 / 16
3rd: 29 / 19
4th: 27 / 21
5th: 25 / 22
6th: 24 / 23


the new 08/09 busa has 114 foot pounds of torque, so that baby is putting out 475.78356 foot pounds of torque to the output shaft, and over 2,616 foot pounds of torque as a final output to the axle number through a 5.5: ratio....
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Offline Engineer

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Re: Busa specs
« Reply #36 on: January 01, 2009, 05:45:26 PM »
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Offline Engineer

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Re: Busa specs
« Reply #37 on: January 01, 2009, 05:47:01 PM »
Quote from: Yoshi on January 01, 2009, 05:44:12 PM
ok, I found a chart for the gear teeth, so I know I was right the first time


Transmission Gear Teeth
1st: 34 / 13 (2.6153846 reduction in 1st. after the final drive ratio.)
2nd: 31 / 16
3rd: 29 / 19
4th: 27 / 21
5th: 25 / 22
6th: 24 / 23


the new 08/09 busa has 114 foot pounds of torque, so that baby is putting out 475.78356 foot pounds of torque to the output shaft, and over 2,616 foot pounds of torque as a final output to the axle number through a 5.5: ratio....

Where is the reduction from the crank to the clutch figured in?   I think the number is even higher.
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Re: Busa specs
« Reply #38 on: January 01, 2009, 05:47:15 PM »
so at 13000 rpm the max speed the counter sprocket can turn is 7757 rpm correct?
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Offline Yoshi

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Re: Busa specs
« Reply #39 on: January 01, 2009, 05:47:21 PM »
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Re: Busa specs
« Reply #40 on: January 01, 2009, 05:48:57 PM »
Quote from: Engineer on January 01, 2009, 05:45:26 PM


Your on the right track here bug...

I could use a smaller engine and get even a larger final gear reduction....
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Offline Yoshi

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Re: Busa specs
« Reply #41 on: January 01, 2009, 05:49:23 PM »
Quote from: Engineer on January 01, 2009, 05:47:01 PM
Where is the reduction from the crank to the clutch figured in?   I think the number is even higher.
no, I gave all the numbers on page 2, the one you quoted was just the gear teetch count which told me what the ratio was which told me the reduction was after the primary, not off the crank.  I multiplied all the tranny numbers off the 158 foot pounds after the primary....


busa crank torque 99

Primary Reduction Ratio   1.596 (158.004 foot pound of torque at the clutch basket)
1st Gear     2.615     (413.18046 foot pounds of torque in 1st. at the output shaft/front drive sprocket)
2nd Gear   1.937     (306.05374 foot pounds of torque in 2nd. at the output shaft/front drive sprocket)
3rd Gear    1.526     (241.1141 foot pounds of torque in 3rd. at the output shaft/front drive sprocket)
4th Gear     1.285    (203.03514 foot pounds of torque in 4th. at the output shaft/front drive sprocket)
5th Gear     1.136    (179.49254 foot pounds of torque in 5th. at the motor output shaft/front drive sprocket)
6th Gear     1.043    (164.79817 foot pounds of torque in 6th. at the output shaft/front drive sprocket)
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Offline Engineer

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Re: Busa specs
« Reply #42 on: January 01, 2009, 05:50:11 PM »
If you go back to the beggining he is trying to setup his gear ratio so that the MINI-Mite motor that he is using will not exceed the torque output of a busa, which has been proven to work with his FNR.  And he is assuming that the Busa was geared to the FNR at 1:1.
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Re: Busa specs
« Reply #43 on: January 01, 2009, 05:50:41 PM »
Quote from: Yoshi on January 01, 2009, 05:47:21 PM
what wouldn't see more torque, a gearbox your attaching?

My Drakart gearbox, they built them with hyabusa engines before, so i know its capable of that much torque, I wont use a busa engine, as i cant afford to for 1... If i use a smaller engine i can gear it deeper in the back, as it is geared to high now....
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Re: Busa specs
« Reply #44 on: January 01, 2009, 05:51:20 PM »
Quote from: Engineer on January 01, 2009, 05:50:11 PM
If you go back to the beggining he is trying to setup his gear ratio so that the MINI-Mite motor that he is using will not exceed the torque output of a busa, which has been proven to work with his FNR.  And he is assuming that the Busa was geared to the FNR at 1:1.

I know it was geared 1:1... ;D
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