When Vehicle Power Dictates Acceleration - Comments

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SUMMARY

The forum discussion centers on the relationship between vehicle power, torque, and acceleration, emphasizing that maximum acceleration is primarily dictated by the available power rather than torque. Participants assert that while torque is crucial, especially at low speeds, the power-to-weight ratio is the key parameter for maximizing acceleration. The discussion highlights the importance of understanding traction-limited and power-limited acceleration levels, with specific examples illustrating how these concepts apply to vehicle dynamics. The consensus is that both power and torque are essential, but power plays a more significant role in determining acceleration at higher speeds.

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  • Understanding of Newton's second law of motion
  • Familiarity with vehicle dynamics concepts such as traction and power
  • Knowledge of kinetic energy and its relationship to acceleration
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  • #31
I've not read the prior comments , but certainly would have read them before commenting if they'd shown,

so if my remarks are repeat of somebody else's please excuse me.. I'll find them after a while.

No response necessary - i'll catch up...

old jim
 
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  • #32
Greg Bernhardt said:
jim hardy said:
(What ? no Latex in Insights comments ?)
Should be fixed in a month or two. Comment in the forums threads.
Thanks, Cap'n !
 
  • #33
Torque (lb ft) versus speed (mph) versus gear for a 2001 Hayabusa (I own one of these). The crossing points of the lines are the ideal shift points. Peak torque in 1st gear translates into about 1.2 to 1.3 g acceleration (depending on rider weight and weight of gasoline in the tank), at which point it's wheelie limited unless the rider sit and leans forward (otherwise the bike tends to lift the front tire at around 40 to 45 mph if at full throttle).

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  • #34
Huh. That graph makes me wonder why 5th gear even exists. There's almost no time in which you'd want to be in 5th.
 
  • #35
Tom.G said:
At the risk of intervening in an apparent theological war,
That's exactly what this thread is. It's big-endians and little-endians all over again, in search of a solutions to a problem that's not be properly specified. With a very few exceptions, the answer is that a good bigg'un beats a good little'n.

I don't know how I boarded this particular train but I only looked at the posting dates when I bumped into the lovely @jim hardy 's name. I bet he'd have a good laugh about this. His last post was in 2019!.
 
  • #36
cjl said:
Huh. That graph makes me wonder why 5th gear even exists. There's almost no time in which you'd want to be in 5th.
If you pay attention to what the gear / up-down display tells you it will help your mpg in long speed restricted stretches. It may not help the boy racer in you but it can save the pennies.
 
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