Internal ratio help???
Do different internal ratios apply power differently? Does it put different loads on the motor? Or is it once I set the rollout it is all the same?
Cheers josh |
It's all the same.
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Originally Posted by sosidge
(Post 11307866)
It's all the same.
It doesnt matter at all, rollout is the important factor. |
Originally Posted by alcyon
(Post 11311630)
I agree. I dont know why some people who have no engineering background (hobby shop owners)make comments like how modern cars are better than the older ones becuase of the lower internal ratio,like the so call modern ratio is more suitable for brushless and such. Like for instance many new cars have IR of 2.0 to 1.8 and the older ones from 6 -12 years back was 2.25-2.4
It doesnt matter at all, rollout is the important factor. |
With the lower ratios, rolling resistance of the cars are much less. The older cars with higher ratios would slow much quicker when off the throttle. But when on the throttle, power delivery was the same regardless of ratios.
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Originally Posted by trigger
(Post 11311767)
With the lower ratios, rolling resistance of the cars are much less. The older cars with higher ratios would slow much quicker when off the throttle. But when on the throttle, power delivery was the same regardless of ratios.
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Actually I think it has something about the physics of having a smaller layshaft pulley than today's larger pulleys. I did a comparison back in the day before brushless was around and hand pushed two highly competitive different brushed cars, one with 1.77 and one with 2.25 and the one with the 2.25 had much more resistance. Meaning it wasn't able to go as far.
But i will agree that with today's brushless and practically common ratios between all cars, they're all equal. |
Originally Posted by trigger
(Post 11311804)
Actually I think it has something about the physics of having a smaller layshaft pulley than today's larger pulleys. I did a comparison back in the day before brushless was around and hand pushed to different brushed cars, one with 1.77 and one with 2.25 and the one with the 2.25 had much more resistance. Meaning it wasn't able to go as far.
But i will agree that with today's brushless and practically common ratios between all cars, they're all equal. |
Originally Posted by BCbud
(Post 11311847)
Bearings, motors, belt tention and gear mesh all could make that test inaccurate. One bearing starting to go or a slight differance in gear mesh or belt tension could make a differance in the outcome. A free moving drivtrain will have a lot more efect on the car than will the internal ratio.
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Cool thanks for all your help :)
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There is no doubt that bigger pulleys are more efficient, and no doubt that lower internal ratios make it easier to gear stock brushless motors - but that is not the same as saying that a certain internal ratio is better.
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