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Old 08-02-2013, 07:42 PM   #61
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Originally Posted by bertrandsv87 View Post
Remember e=mc2....
All this proves is there enough energy contained within the mass of an RC car, that if released, would destroy a small sized city.


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In this hobby nothing is negligeable... Every milligram counts. Lighter gears make your Car accelerate and decelerate faster while conserving energy and decrease battery voltage loss throughout the run... It's a chain reaction that can make a big difference...
Perhaps, i think in reality a whole lot of what people do have more or less negligible or even zero influence over the car other than in their minds. Confidence in your gear is important, maybe even as important as good setup.

When you look at Keven Maceys post, someone who did the math and came up with a result of 0.06%, sounds like a lot does it, not really, and in terms of lap times we are talking in the 1000ths of a second. And it is only true if all setup changes effect lap times in a linear way, they do not.

Changes to a car are not linear, they are exponential, hence the law of diminishing returns, and the closer you get to the physical limits of the car, the less effect these changes have on the car.

So, unless you have reached the limits of the standard big ticket items of setup, the things which have the greatest effect on lap time, you have achieved very little, and if you have reached the physical limits of conventional setup, you will gain something that is most likely statistically irrelevant.
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Old 08-02-2013, 07:54 PM   #62
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the oval guys go for the largest gears you can run. Some have run them on the dyno and claim they can see the difference in amp draw.
Larger gears do reduce the force that tries to separate the gears. Is this big enough to matter, probably not in the range of gears we run now. In the old days, it probably mattered. Think 11 to 15 T 48 P pinions. Now we run 40 to 50 tooth pinions. The bigger difference is how the motor sits in the pod and how it effects the moment of inertia of the pod.
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Old 07-24-2014, 05:41 PM   #63
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That was not what the original post was asking. He wanted to know if there was an advantage in using different size gear combinations (larger pinion & smaller spur or smaller pinion & larger spur) and maintaining the same FDR. He was trying to determine if the rotaional weight of a pinion gear, or gear mesh, has any effect when choosing what he uses.
Exactly !!!! My thoughts are that with the smaller pinion/larger spur setup the motor will run cooler. I'm not sure about this either but wouldn't the motor rev up quicker because of the pinion being smaller?
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Old 12-09-2017, 10:55 PM   #64
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Tried this several years ago in Offroad, as the thought generated couriosity...the smaller spur/larger pinion seemed to put more of a strain on the motor and resulted in worse overall performance. Have not since tried it in Onraod....
did i necro a thread? good in this case it needs to be due to something i just noticed on team associateds site.

basically if you look at the various T4 models that have a 2.60:1 tranny you will notice that on the T4.1 it is recommended 11.31:1 FDR ( 20/87), however in the T4.2 and later ( still with a 2.60:1 tranny) they recommend for 8.5t and 9.5t motors a 10.92:1 FDR ( 20/84).

the ONLY difference in the gearing section is the T4.1 generalizes the motor while the T4.2 and T4.3 specify the reedy branded motor. does this make a difference? i seriously doubt motor branding plays a part but i did find it odd. i bought an 84 spur to try the ratio on my old T4( original us made team kit) because with my skyrc cheetah 8.5t the motor is nice at 130f but regardless of slipper setting ( including locking it down) the slipper constantly spins and over heats. i upgraded to vts and that didnt work, i now have the revolution design vented vts and still it gets to hot to touch, i have also added a 4th total pad ( 1 behind spur, 3 in the vts) and still it slips.

now as far as gearing goes i am wondering ( not worried about gear ratio at all here seeing as the main goal is to get as close to a 1:1 rollout as possible with good speed and motor staying cool LOL),is it better to use a smaller spur or a bigger spur .
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Old 12-10-2017, 02:17 AM   #65
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Originally Posted by lordraptor1 View Post
did i necro a thread?
Yes. Can you not see the timestamps on the posts?
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the ONLY difference in the gearing section is the T4.1 generalizes the motor while the T4.2 and T4.3 specify the reedy branded motor. does this make a difference?
Yes, it can do.
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i seriously doubt motor branding plays a part but i did find it odd.
Different motor designs can have quite different torque/rpm characteristics which needs to be geared differently. Take recommendations with a grain of salt, they're starting points and you need to test and check temps as appropriate.
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Old Today, 04:42 PM   #66
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Dont know if it's been answered but all he is really playing with is the placement of the motor while maintaining same final gearing.
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