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Old 11-09-2009, 12:00 AM   #1
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Default Which pinion should I use with..Please help.

Car ratio: 2,25 Tamiya TA5MS
Motor: Tamiya GT Tuned (I think is a 25T)
Track: Small
Spur gear: 105 64 DP

I don,t know how to calculate the ideal pinion in this case as I only know for bruslles motors..can anyone help me please?
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Old 11-11-2009, 11:12 PM   #2
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anyone?
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Old 11-12-2009, 12:09 AM   #3
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Divide number of spur with pinion, then multiply by 2.5, or refer to your TA05MS manual for a gearing chart.
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Old 11-12-2009, 02:09 AM   #4
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Divide number of spur with pinion, then multiply by 2.5, or refer to your TA05MS manual for a gearing chart.
Yeah , I know how to do that.. But what I am asking, is for the ideal ratio using a 25T, as I only know for brushless motors.
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Old 11-12-2009, 02:21 AM   #5
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Quote:
Originally Posted by suparajicon View Post
Yeah , I know how to do that.. But what I am asking, is for the ideal ratio using a 25T, as I only know for brushless motors.
That's interesting. And what method pray tell is that?

I am afraid you have some misaprehensions about what is ideal. Ideal ratio doesn't exist outside some well defined constraints. Which means the ideal FDR for a set of conditions (grip, track, esc setup, etc) is not going to be ideal at all for another set. As you mention none of these conditions, it is nigh-on impossible for anyone to help (which is why you didn't have any answers).

Besides, there is no calculation to help you here. Run the car, take temperature readings on the motor and see if you are on pace. That's how it's done.
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Old 11-12-2009, 03:06 AM   #6
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Originally Posted by niznai View Post
That's interesting. And what method pray tell is that?

I am afraid you have some misaprehensions about what is ideal. Ideal ratio doesn't exist outside some well defined constraints. Which means the ideal FDR for a set of conditions (grip, track, esc setup, etc) is not going to be ideal at all for another set. As you mention none of these conditions, it is nigh-on impossible for anyone to help (which is why you didn't have any answers).

Besides, there is no calculation to help you here. Run the car, take temperature readings on the motor and see if you are on pace. That's how it's done.
When I buy brushless motors,for example I was running a 10,5T, until my ESC got broken. Nosram says the final should be 6 (of course this depends on track, batteries,tires..).
Spur gear/pinion gear x internal car ratio= final ratio
Lets say I was gonna use the Brussless Nosram 10,5T:
105/40 x 2,25 = 5,90
5,90 is close to the 6 they recomend, of course that changes if I use Lipo,Life.. 5 cells, 6 cells...smaller or bigger wheels..etc
For a 25 turns brushed, there should be final ratio where start from,and this is what I don,t know.
Also I have no idea what the ideal temperature should be for brushed motors, so it makes it difficult to calculate for me.
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Old 11-12-2009, 05:32 AM   #7
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I am not sure what you mean by saying Nosram says this or that. FDR depends on what you do with the motor more than what the manufacturer says. If they are serious about the FDR they suggest, then they should suggest some application the suggested FDR is good for. Otherways it's a joke.

Optimal temperature for brushed is reached when you are just about to burn it. This is learnt by experience. My suggestion is as above. Gear low, take temps, compare your speed/acceleration with the fast guys and gear up until you catch up provided the motor does not get too hot. Too hot is when you can't touch the motor without getting burned instantly. It will start to smell funny before it burns, so that's a giveaway you should stop gearing up or perhaps gear down a notch.
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Last edited by niznai; 11-13-2009 at 02:59 AM.
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Old 11-13-2009, 01:54 AM   #8
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Thanks pal! How you say seems to be a good way!
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