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Old 04-25-2006, 09:38 AM   #7126
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Thanks, guys... AB is hooking me up as we speak!
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Old 04-25-2006, 09:41 AM   #7127
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Gearing recommendations for a CO27?
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Old 04-25-2006, 10:01 AM   #7128
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Quote:
Originally Posted by Jason B
Gearing recommendations for a CO27?
I've been trying to figure that out myself. Seems like most people are saying around 27.5 - 30mm rollout.

Print yourself a targeted rollout chart for the RDX with your spur gear of choice from gearchart.com and keep it in your box. Take notes on how the motor performs at different rollouts, otherwise you'll likely forget. It's nice to have around in a hurry.
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Old 04-25-2006, 10:07 AM   #7129
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Any idea what pinion to start with for the CO27? Sorry to be asking so many questions. I'm a TC virgin. Go easy on me.
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Old 04-25-2006, 10:11 AM   #7130
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How big is your track? Are you running foam tires? Rubber? If you are running foams how big are they?

-Korey
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Old 04-25-2006, 10:14 AM   #7131
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It's a medium-sized indoor carpet track where everyone runs cyan and magenta foams. Unfortunately, I have no idea what people are trimming them to.
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Old 04-25-2006, 10:19 AM   #7132
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Quote:
Originally Posted by Jason B
Gearing recommendations for a CO27?
For the cobalt, I run a 35/116 pinion/spur combo. As for the monster, I usually start out at 32/116. Alot of your gearing will also depend on how your track is laid out, how long the straight-a-way is, etc. Find out what your local guys are doing for your local track as far as gearing and rollout, and go from there. Oh, and with the gearing on the cobalt I just mentioned, it's rolling out around 30 with 63 mm (rubber) tires. Hope this helps.

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Old 04-25-2006, 10:41 AM   #7133
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Quote:
Originally Posted by Mr. McGoo
- i bought the lunsford titanium camber links for easier adjustments for toe and camber

Just take an old allen wrench and trim off half of the 'short' end of the wrench. Depending on the position of the turnbuckle, you can then use either the long end of the wrench *or* the short end to make your adjustments. No matter what the position of the adjustment hole on the link is, you can get to it with this setup. It's actually much, much simpler (and cheaper!?) doing it this way than using the Lunsford setup and wrench.
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Old 04-25-2006, 10:54 AM   #7134
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I am planning to replace the ball cups on the car. Which ones would you recommend?
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Old 04-25-2006, 10:59 AM   #7135
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Jason B,

The car works best on 55.5 to 57 mm (2.18-2.25") tires. You should roll that CO27 between 29.2-30 mm (1.15"-1.18") depending on track layout.
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Old 04-25-2006, 11:48 AM   #7136
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I'm guessing you're not familiar with rollout.

Since the diameter of foam tires changes when you run them, so does the gear ratio. For this reason, people use "rollout" which is a way to speak about how to gear motors without having to talk about tire diameter. If you're interested in the exact equation, I'm sure McFormula will speak up and provide it for you.

Basically, just grab yourself a rollout gear chart from gearchart.com and don't worry about the math. Some people express rollout in inches and some in millimeters. It's easy enough to convert between the two, the most simple way being to type: "1.08 inches to mm" in Google, and vice versa to convert between the two units.

Also, rollout is usually only mentioned in foam tire racing due to the variation in tire sizes. In rubber tire racing, where the tire diameter is mostly static, people prefer to use FDR (final drive ratio).

Thus concludes the 8000th different explanation of rollout on RCTech. :-)
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Old 04-25-2006, 12:04 PM   #7137
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Quote:
Originally Posted by syndr0me
Thus concludes the 8000th different explanation of rollout on RCTech. :-)
Now, care to explain droop?
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Old 04-25-2006, 12:15 PM   #7138
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Not to throw a monkey wrench in there for ya guys, but rubber tires while far more static than foam tires which change up to 2mm from start to finish (56.5mm >> 55.0/54.5 when done) do vary up to 1mm from new to say 10 runs in--particularly prepackaged RP/CS tires with those fairly soft inserts. Go measure some multi-run tires and you'll see. Pretty interesting...

You'll notice that a definite compression happends to the tires as well and subsequently to the ride height and overall rollout.

If you run a taller rim/firmer insert, you'll notice less of this compression.
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Old 04-25-2006, 12:54 PM   #7139
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I just finished placing my kit and parts order with Jim at AB Charles. He was extremely helpful both through PM's and over the phone. If every hobby shop was as knowledgable about their products as Jim is, there would probably be a many more successful hobby shops. Great guy.

Can't wait to build my RDX!
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Old 04-25-2006, 01:15 PM   #7140
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Quote:
Originally Posted by adavison1974
I have just tried to put RW spur gears on my RDX. However when trying to attach the adapter to the spur i noticed that only two of the screw holes match up with the spur. Is this right or is there another adapter which needs to the be used with RW spur gears.

Cheers
RW gears I believe don't fit because they are a 6 hold pattern instead of an 8 hole pattern. Kimbrough, Corally and other standard 8 hold pattern gears will work. There is no optional adapter.

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