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Build Complete: Tamiya DF-03Ra 2-speed

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Build Complete: Tamiya DF-03Ra 2-speed

Old 11-24-2017, 09:34 PM
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Fixed all pictures in this thread.

Also, I did end up switching back to the Dynatech 01R motor I originally used. I found a better application for the Dynatech 02H, and the Dynatech 01R works fine with the modifications I made to it previously.
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Old 11-25-2017, 06:24 AM
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damn it fyrstormer, you're back with these cool projects again.
Your projects made me jealous.
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Old 11-27-2017, 12:13 AM
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Old 12-12-2017, 08:23 AM
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Older thread, I know... but very nicely done.
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Old 12-13-2017, 12:19 AM
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Thanks!

It might be an older thread, but this is where I post updates for this vehicle, so it will be alive as long as the vehicle still runs.
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Old 01-23-2018, 10:03 PM
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Minor update to this vehicle: I installed an aluminum rear diff to save a few grams, because I'm currently on a weight-saving kick on my touring cars. There isn't an aluminum diff available for this vehicle, but a little trial-and-error and a lucky guess resulted in discovering the Yeah Racing aluminum diff for the TB Evo 3 is a very close match. I had to buy thrust washers for the long-discontinued F201 4WD F1 car, and I had to shave 2mm off one side of the ring gear to keep it from rubbing against the side of the diff housing, but there's still plenty of contacting area to keep the ring gear from stripping under load. (actually I could've shaved less material, but I wanted to maintain the original clearance between the side of the ring gear and the side of the diff housing, just because.)





So that's good for about 6 grams of weight savings. It's not a lot, but eh, it kept me off the street for a couple hours.
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Old 01-23-2018, 10:48 PM
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delete
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Last edited by Tamiyadan; 04-17-2019 at 08:02 AM.
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Old 01-25-2018, 02:39 AM
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Is it a ball-diff or a gear-diff?
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Old 01-25-2018, 04:14 AM
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ball diff you can clearly see the ball in his 1st pic.
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Old 01-25-2018, 02:49 PM
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Yep, it's a ball diff. That's the only reason I was able to shoehorn a not-quite-right diff assembly into the rear gearbox, because ball-diff spur gears are so narrow on the inside that there's plenty of room to shave material off the outside to make them fit anyway. Gear diffs are too wide for this sort of modification.

For the record, I use tungsten-carbide diff balls, to avoid the possibility of flat-spotting the diff balls if they slip. Obviously the diff balls would never roll smoothly again after flat-spotting.
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Old 01-26-2018, 02:31 AM
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Nice, an anodized diff. Though I'm kinda reluctant to the idea of running an aluminum diff; I don't want to waste more time replacing worn aluminum outdrives.
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Old 01-26-2018, 11:18 AM
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Any videos of that thing running?
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Old 01-26-2018, 12:55 PM
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Originally Posted by sum guy View Post
Nice, an anodized diff. Though I'm kinda reluctant to the idea of running an aluminum diff; I don't want to waste more time replacing worn aluminum outdrives.
That's where the fiberglass-reinforced-nylon guards come in. They fit over the pins on the dogbone end of the axle, and the plastic wears-down instead of the aluminum wearing-down. The aluminum will still wear-down eventually, just as steel outdrives wear-down eventually, but the plastic reduces the wear immensely. I've been using them on a few cars with aluminum outdrives lately, and I've seen no wear on the aluminum outdrives except for polish-marks. As an added bonus, they don't need to be lubricated like steel outdrives do, because there's no metal-on-metal contact.
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Old 01-26-2018, 12:56 PM
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Originally Posted by NitroB810 View Post
Any videos of that thing running?
*sigh* Not yet. Either I need an assistant to hold the camera or I need a GoPro with a wide-angle lense, so I can put it on a tripod. It's too hard to drive and hold the camera at the same time, and I really don't want to crash my nice projects.
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