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Thread: what is the best gear reduction>???and what ratio?

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Old 10-21-2004, 01:47 AM   #1
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Default what is the best gear reduction>???and what ratio?

I am looking for a geaR reduction, what would be the best to go with?? I know the gd-600 comes with a 3 to 1 ratio and a 2 to 1 ratio, what would be better??

also can someone link to a good place to buy...

Thanks...
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Old 10-21-2004, 08:58 AM   #2
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Default Re: what is the best gear reduction>???and what ratio?

The GD comes with an 18t pinion, which gives it a 2:5.1 out of the box. I bought a 13t to go along with it, but after running the stock pinion (with a 9t on the other end), I think that'd be to slow.
R/C Unlimited on Union and Camden has (had) them for $13 (same as Tower). It was listed under the wrong part number though. Ask for a GS-600. Or, give them the Tower part number, LXSL79.
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Old 10-21-2004, 09:26 AM   #3
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Default Re: what is the best gear reduction>???and what ratio?

The slower the better... i found that the GD600 was very easy to mount and centered the motor almost perfectly. i have found out that with the 3:1, my rig will almost not free roll downhill once you stop... its kinda nice. there are a bunch out there but this one seems to be the most popular... with the most info on line too,....
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Old 10-21-2004, 10:39 AM   #4
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Default Re: what is the best gear reduction>???and what ratio?

how owuld the motor mount work?? from a double to single motor mount?? do I have to make one?? if, so what did u guys do or use to make one???

so best thing to do is to leave the the reduction alone and play with different pinions on the motor??

what combo would I have to run to get a 3:1 ratio??

thanks again guys...
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Old 10-21-2004, 10:59 AM   #5
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Default Re: what is the best gear reduction>???and what ratio?

Your can go the mammoth route as well. But all the answer are you just search around and you'll find them. I'm running a GD600 @ 2.5 with a 9t on the motor. I've run it with a lathe motor and it was pretty slow I changed to a 27t and I now have wheel speed but it doesn't crawl as well. I might go to 3.0:1 with the 27t. But my motor is making funny noises all of a sudden. So we'll see
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Old 10-21-2004, 12:02 PM   #6
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Default Re: what is the best gear reduction>???and what ratio?

Quote:
Originally Posted by 86ss1
how owuld the motor mount work?? from a double to single motor mount?? do I have to make one?? if, so what did u guys do or use to make one???

so best thing to do is to leave the the reduction alone and play with different pinions on the motor??

what combo would I have to run to get a 3:1 ratio??

thanks again guys...
It's a straight bolt on, with a little booty-fab. The output side of the GD has to be shaved down to fit in the motor plate. I used a razor blade. The shaft also needs to be turned to accept standard 3.2mm pinions. Another option is to drill a pinion for a 5mm shaft, but you can't use a 9t. When I tried drilling a 15t, it got got all screwed up and wouldn't sit straight. PM Dude, he should have some shafts.

I posted a chart >>in this thread<< that has a gearing chart. Here it is as well...

Code:
GD redux: 2.5:1 (18t 48p pinion on motor - stock as supplied from Great Planes) 
Output shaft pinion:    tranny ratio:   final redux: 
15t                     34 (stock)      85 
14t                     36.4            91 
13t                     39.2            98 
12t                     42.5            106.3 
11t                     46.3            115.6 
10t                     51              127.5 
9t                      56.6            141.5 

GD redux: 3:1 (15t 48p pinion on motor) 
Output shaft pinion:    tranny ratio:   final redux: 
15t                     34 (stock)      102 
14t                     36.4            109.2 
13t                     39.2            117.6 
12t                     42.5            127.5 
11t                     46.3            139 
10t                     51              153 
9t                      56.6            170 

GD redux: 3.5:1 (13t 48p pinion on motor) 
Output shaft pinion:    tranny ratio:   final redux: 
15t                     34 (stock)      119 
14t                     36.4            127.4 
13t                     39.2            137.2 
12t                     42.5            149 
11t                     46.3            162 
10t                     51              179 
9t                      56.6            198 

GD redux: 3.8:1 (12t 48p pinion on motor) 
Output shaft pinion:    tranny ratio:   final redux: 
15t                     34 (stock)      129.2 
14t                     36.4            138.3 
13t                     39.2            149 
12t                     42.5            161.5 
11t                     46.3            176 
10t                     51              194 
9t                      56.6            215.1

Last edited by cheapjeep2; 10-27-2005 at 07:50 AM.
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Old 10-21-2004, 03:14 PM   #7
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Default Re: what is the best gear reduction>???and what ratio?

I went with the 129.2:1 ratio.

Works quite nicely, slow, torquey, and just enough wheel speed left over.
It's my 3rd, and final gear ratio change.
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Old 10-21-2004, 04:36 PM   #8
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Default Re: what is the best gear reduction>???and what ratio?

Can someone give me the final ratio with 20t 48p & 9t 32p.

THANKS
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Old 10-21-2004, 07:23 PM   #9
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Default Re: what is the best gear reduction>???and what ratio?

The spur on the GD is 46t, so 46/20=2.3:1
We know a 9t pinion on the the tranny gives us 56.6:1, so 56.6x2.3=130.18.
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Old 10-21-2004, 07:49 PM   #10
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Default Re: what is the best gear reduction>???and what ratio?

Thanks
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Old 10-22-2004, 10:20 AM   #11
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Default Re: what is the best gear reduction>???and what ratio?

I tired searching aroung but couldn't really find anything productive about the inline reduction. I kept running into people who would say it but then go on to talking about a 600 or mamoth. Anyone use these around here, if so why or why not?
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Old 10-22-2004, 10:44 AM   #12
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Default Re: what is the best gear reduction>???and what ratio?

You mean the MP-Jet worm reduction? Looks cool, but needs more mods to make it work. Something about an adapter plate. Plus, I think's it harder to find than the GD, even the Mammoth box. I don't know to much about it, but I don't think you can adjust internal ratios with it. It's set at 3.8:1, IIRC.
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Old 10-24-2004, 06:29 PM   #13
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Default Re: what is the best gear reduction>???and what ratio?

I am starting to build up my stock TXT, Going to do the standard stuff , and want to set it up with one of these reductions.Now the big question , I would like to run it with a Magnectic mayhem motor , which ould it be.Standard rotation or reverse rotation?
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Old 10-24-2004, 10:20 PM   #14
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Default Re: what is the best gear reduction>???and what ratio?

With a GD 600 and the motor in the back, it's normal rotation.
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Old 10-26-2004, 06:08 PM   #15
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Default Re: what is the best gear reduction>???and what ratio?

Motor in the back??????
Do I have to turn the tranny around? What about leaving it stock?
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Old 10-26-2004, 07:13 PM   #16
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Default Re: what is the best gear reduction>???and what ratio?

Quote:
Originally Posted by Inkmaxx
Motor in the back??????
Yup, some of us are wierd that way.

Quote:
Originally Posted by Inkmaxx
Do I have to turn the tranny around?
Uh huh.

Quote:
Originally Posted by Inkmaxx
What about leaving it stock?
Then you use a reverse rotation motor with a GD.
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Old 10-27-2004, 09:01 PM   #17
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Default Re: what is the best gear reduction>???and what ratio?

So if I were to just replace both stock motors , I would have to replace them with reversed motors?
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