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Old 07-27-2004, 12:14 AM   #1771
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Oops, my fault. His signature mentioned Yokomo.
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Old 07-27-2004, 12:18 AM   #1772
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Quote:
Originally posted by DOMOisCOOL
To figure out FDR (Final Drive Ratio), find out the internal gear ratio of the car first. I believe you are driving a Yokomo SD? If so, the internal gear ratio is 2.35. Then find out the spur/pinion size.

Ex:
Spur/Pinion= ??? x 2.35 = FDR

72/21= ~3.4 x 2.35 = 8.0.

Hope this helps.
i'm not running my Yoke yet; with all the upgrades, it is about a $800-1000 car that i don't want to bust up. but right now i'm racing a Losi XXX-s RTR that i'm slowly but surely converting to an Graph.+. this is the car i'm learning technique, driving skill and tuning on. it has a 88t spur/21t pinion on a Monster stock.
You guys are great, thanks 4 all the help & keep it coming .

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Old 07-27-2004, 12:52 AM   #1773
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Monster stock - 24-30 rollout depending on the track. I run a 25-27 rollout on a medium sized track.


Q? - Is the BRCA Binary 2 magnets?

Last edited by fatdoggy; 07-27-2004 at 01:02 AM.
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Old 07-27-2004, 02:45 AM   #1774
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I run the Orion Core Stock motor.

When a local expert at the track tested it, he said it was a very slow turning motor. He said it must be a torque motor. I have no clue. I am running my TC3 with stock pinion and 25T spur. I can't figure out if I'm getting outrun in the straights due to cheap batteries(Reedy BlackLabel 3300), cheap ESC (Duratrax AutoSport), or wrong gearing.

So, is the Trinity Monster a better motor for a beginner? Dang I dunno about all this stuff.
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Old 07-27-2004, 10:36 AM   #1775
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The Core Stock, Reedy MVP and Peak Hellfire are basically the same motor...based on the Reedy/Yokomo can I think!? They are torquier motors and would require a larger pinion. Based on your gearing, you're around 7.2 final drive ratio. I run my Cores around 6.25. A good tuning tip is to run them with narrowed brushes (0.140"). This is a "Big Jim" tuning tip and it's always worked for great me.
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Old 07-27-2004, 01:08 PM   #1776
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Smile

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Last edited by SMcpot; 07-29-2004 at 02:54 PM.
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Old 07-27-2004, 02:14 PM   #1777
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The Mvp uses a yok can and endbell. The orion and peak use a Top can and endbell.
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Old 07-27-2004, 02:26 PM   #1778
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How many of you guys own your own mini-lathe's to cut the comm's? I'm new to this hobby and was wondering if I needed to pick one up. I'm just racing stock, anyways.
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Old 07-27-2004, 02:27 PM   #1779
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Quote:
Originally posted by donoman
How many of you guys own your own mini-lathe's to cut the comm's? I'm new to this hobby and was wondering if I needed to pick one up. I'm just racing stock, anyways.
If you race alot, you should pick one up. If you just race once in a while, use a fellow racer's.
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Old 07-27-2004, 02:53 PM   #1780
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I've got a lathe. My best two investments in this hobby were a decient charger and a lathe. I'd say get one if you intend on racing every week. I cut after 4-5 runs and it's really much easier then asking others to cut your comm. If you'd rather not buy one just yet, offer someone a bottle of soft drink or a few bucks and they'll cut your comm for you.

Just a note, it's very annoying when you cut someones comm and it takes alot of passes to clean it up. At least have your comm cut every 8-10 runs if your racing.
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Old 07-27-2004, 06:33 PM   #1781
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I have a P2K2 that should be in next week. Lemme know what you guys think!
I have had 3 of them and they are great. Right now I have a P2K Copperhead Pro with 30,600 RPM 116.7W 70.7%efficiency, 175N Torque, and they all run like they are lower than 20T, they are great motors
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Old 07-28-2004, 12:24 AM   #1782
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Quote:
Originally posted by donoman
How many of you guys own your own mini-lathe's to cut the comm's? I'm new to this hobby and was wondering if I needed to pick one up. I'm just racing stock, anyways.
Just show up for the racing at RC Tech in Daly City and someone can cut the commutator for you. I did three other racer's motors this past Sunday. You don't even have to be a "racer" for us to help you out.

See www.rctechonline.com for their race schedule.

Might need about $3 to buy replacement brushes to go with the comm cut.

After seeing some racing and talking with the locals, you should be able to decide about buying a lathe for yourself.
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Old 07-28-2004, 12:29 AM   #1783
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I have one but right now Im at the point that I do more harm than good when i use the thing.

Not good at it at all. And are more about cleaning them instead of cutting them.
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Old 07-28-2004, 12:32 AM   #1784
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Quote:
Originally posted by XXX-S Bill
Just show up for the racing at RC Tech in Daly City and someone can cut the commutator for you. I did three other racer's motors this past Sunday. You don't even have to be a "racer" for us to help you out.

See www.rctechonline.com for their race schedule.

Might need about $3 to buy replacement brushes to go with the comm cut.

After seeing some racing and talking with the locals, you should be able to decide about buying a lathe for yourself.
Donoman told me you cut his comm on Sunday.
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Old 07-28-2004, 12:50 AM   #1785
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i have a rtr tc3 and i plan to upgrade to a reedy spec 19t quad magnent motor, and i was wondering if i should just use the stock spur and pinnon gears with it or get better ones?
also is their so way to figure out a motors mph?
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