disasterofdaeast

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well i looked and i couldnt find any on here... but i keep getting confused with the pinon and spur gears and how the # of teeth affect the speed. i want top speed but i would also like to know what # teeth do what and what combos are best. thanks alot

18r master

lower number of teeth give less top speed but more accleration and higher number of teeth give more top speed but less acleration

hope this helps

disasterofdaeast

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what is one is high and one is low?

FloridaDude

the higher the pinion and lower the spur the more speed. And the lower the pinion and higher the spur the more acceleration

disasterofdaeast

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also, i have 3 motors... a 370sd, fireball 370p, reedy mini-max modified and was wondering what is the best one, speed wise

FloridaDude

the amrk 370sd is crap if thats what u have. the fireball 370p is 17 turns and the reedy is 17 or 19 depending on which u got. so the fireball and reedy are the same if both are 17t. i would put the reedy in IMO.

disasterofdaeast

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yeah thats what i have in it, what do the turns mean? like 17 turn

disasterofdaeast

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can you fit 1/18 tires on 1/16 rims? for the loprofile look?

FloridaDude

it means the how many times the wire is wrapped around the armature i think *looking kinda confused* . 45turns hi torque, 10 turns hi speed just to give u alittle more info. and i dont think the tires would fit plus u would need a adaptor for the wheels anyway.

disasterofdaeast

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everyone els feel free to add to this i want to hear what u got to say about any cool mods that are cheap and easy

FloridaDude

my .02 cents go brushless

MMT GUNS

Example -> 14T + 60T = 4.28

14 motor pinion + 60 spur gear = final gear 4.28

Locate the spur gear size you want to know the ratios for then find the pinion gear size in the left column of that table. The ratio value is in the box to the right of the pinion gear. If the sizes you wish to know the ratios for are not here simply divide the spur gear teeth by the pinion teeth. The ratio is the number of revolutions the pinion gear makes for every one revolution of the spur gear.

32 Pitch
Pinion 54 Tooth Spur
9T 6.00
10T 5.40
11T 4.90
12T 4.50
13T 4.15
14T 3.85
15T 3.60
16T 3.37
17T 3.17
18T 3.00
19T 2.84
20T 2.80
21T 2.70
22T 2.57
23T 2.45
24T 2.34
Pinion 56 Tooth Spur
9T 6.22
10T 5.60
11T 5.09
12T 4.66
13T 4.30
14T 4.00
15T 3.73
16T 3.50
17T 3.29
18T 3.11
19T 2.94
20T 2.80
21T 2.66
22T 2.54
23T 2.43
24T 2.33
Pinion 58 Tooth Spur
9T 6.44
10T 5.80
11T 5.27
12T 4.83
13T 4.46
14T 4.14
15T 3.86
16T 3.62
17T 3.41
18T 3.22
19T 3.05
20T 2.90
21T 2.76
22T 2.63
23T 2.52
24T 2.41
Pinion 60 Tooth Spur
9T 6.66
10T 6.00
11T 5.45
12T 5.00
13T 4.61
14T 4.28
15T 4.00
16T 3.75
17T 3.52
18T 3.33
19T 3.15
20T 3.00
21T 2.85
22T 2.72
23T 2.60
24T 2.50

disasterofdaeast

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yeah i want to but whats a good chaep motor?im open for sugestions

Gex_61

What car is it?[sm=bananahead.gif]

I'm guessing RC18?

disasterofdaeast

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so the lower the "final gear" the more the power and the higher the "final gear" the more speed?

MMT GUNS

Correct

disasterofdaeast

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yeah rc18mt but i have it as a buggie right now

FloridaDude

good motors usally arent cheap i would put the mini-max in

disasterofdaeast

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anyone wana sell me one? lol

FloridaDude

sell u what

disasterofdaeast

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a brushless thats faster than what i have (listed above)

Gex_61

You have it backwards.

FYI, the final gearing is what you get when you multiply the spur/pinion gearing by the internal gearing.

The internal gearing for the RC18 series cars is 2.5 if I remember correctly. Divide the differential gear by the input gear. This gearing usually can't be changed. It's only purpose is so you aren't using unrealistic spur/pinion options to get a usable gearing. It splits the work basically.

For the spur pinion-
Lower number = top speed
higher number = more torque
Because................. The ratio is the number of revolutions your pinion makes every time your spur gear makes 1 complete turn.

and also the overall gearing-
Lower number = top speed
higher number = more torque
Because................. The ratio is the number of revolutions your motor makes every time your wheels make 1 complete turn.


Here is a good chart to get an idea of how gearing works. Put 2.5 for the internal gearing, and look at the possibilities you have for the spur/pinion. http://www.teamassociated.com/racerh...ripttable.html

disasterofdaeast

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sorry for asking so many questions but this is confusing to me but in the chart the lower numbers are speed and the higher are power, correct? how much of a diference is there from 14 & 15

coinstarp

Not to say you are wrong but I think your explanation was pretty confusing. First off, what is a "spur pinion" those are two different gears. The smaller the pinion the more torque, the larger the pinion the higher top end. The smaller the spur the higher the top end, the larger the spur the more torque. It makes perfect sense because as you said the final drive ratio is found by dividing the spur gear's teeth by the pinions. The higher number (high numbers are actually called "low" gearing) in the final drive ratio the more low end, the smaller the number the more top speed.

Gex_61

Sorry if I am confusing, it's confusing stuff. When I say spur/pinion, I am talking about the # in bold- 60/13=4.62 Got it now?


No problem, I hope I am helping. This stuff is kind of confusing. Once you get it, it should be like the back of your hand.

Going up or down a tooth on the pinion (small gear) will make a large difference; much larger than going up or down a tooth on the spur (large gear). Changing the spur is more for fine tuning.

I am using 13/60 gearing for my backyard track, so the spur/pinion gearing is 4.62
4.62 x 2.5 = 11.55 overall gearing

For dirt oval racing at my local track, I find that the best mix of acceleration and top speed is by using 14/55 gearing, so the spur/pinion gearing is 3.93
3.93 x 2.5 = 9.83 overall gearing

The oval is 60' by 100', so I need a gearing that helps with top speed (low number). My backyard is only 22' by 35' with jump everywhere, so I need a gearing with more torque (high number). Your "power" is technically the same, but the gearing changes how you use it. Remember to keep an eye on motor temperature.

I don't want to confuse you any more, but you will want to change your gearing if you change the circumference of your tire. I know you said you went from MT to T or B tires. Changing the tire does not change the gearing. The gearing is still the same as I have described above, but by changing the circumference of the tire, you are covering more or less ground, and your motor will be working more or less to accelerate.

A lot affects what your gearing needs to be.