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Honza

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About Honza

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  1. (Image from rctech) The small spur/idler engages from opposite side than in TL-01, and since speed tuned gears are narrower, the contact between teeth is quite narrow. It does work, but I'm concerned about longevity with a stronger motor, I stripped couple of stock ones back in the days with TL-01. The issue could be probably solved by shaving the tube part and getting narrower bearing or some insert with a smaller bearing, to get the gear closer to the motor. Since I already needed an extra gear to relocate the motor, I used M-05 gear set to achieve the exact same gearing as other Tamiya M-chassis. But I also designed it with wider range in mind, covering gearing of TL-01 and M-07 as well. It does not go as low as the original MF-01X, the lowest possible ratio being roughly equivalent of 18T pinion with the original gearing, but IMO that's not needed as long as it's used as an onroad/rally car.
  2. One positive thing I forgot to mention about MF-01X is its flexibility. The simple shaft and range of chassis inserts allows you to set up any wheelbase from 170mm to infinity and beyond 😃 and I'm not exaggerating (a photo I found on Facebook) Its compatibility with old stile Tamiyas adds range of compatible suspension widths from M-chassis to buggy, which makes it a great platform for non-standard bodies.
  3. I didn't build it, I just found the blog. 😃 The slipper pads do have flats, they are just not as pronounced as on Tamiya parts.
  4. All the red parts (except for stock uprights) were needed to make somehow decent chassis. Of course front CVDs and some modifications to improve turn radius, ball bearings and oil shocks are necessary upgrade. The issues I had and solved: - The rear was too heavy especially with short lipo. The new motor position is also considerably lower. - gearing taken from TL-01 didn't really fit M-chassis - the longest stock gear ratio is slower than slowest M-05. And the speed tuned gear set doesn't engage entire teeth. - it's nice that it supports square lipol without need for option parts, however, the holders don't work well and keep battery exposed. On a narrow rally chassis... It's worse with short packs, which cannot be even secured with stock holders. - I just couldn't find spring combination that would work well with stock front axle and had to use water-like oil to get soft dampong.. I had to redesign front arms, which helped, but I'm still not happy with it. - this is not exclusive to MF-01, but the front "bumper" is a joke. In the end, it cost$ about the same as XM-01. And although I have some criticisms towards XM, as a rally chassis it's the better option.
  5. Looks awesome! Until now, I didn't even realize that XV-02 uses bodyposts in the bumper. Looks like the RS Pro shock towers are closer in geometry to the XM ones. Of course they are only sold in pairs, so you'd end up with two unused towers, if you wanted to use rear tower for front axle. These have been in use since TRF417 - in fact, XM-01 uses the same wheel axles (hint for DCJs 😁) I prefer them over grub-screws since there's no risk of the grub screw becoming loose. Never had problem with them, just make sure that the spring clips are oriented properly, with the loose end pointing opposite to the direction of rotation.
  6. You can - there's a tube that goes through the bearing, which transmits force from the nut to the spring. It's quite limited range, but you could increase tension by adding inserts between the spring and tube.
  7. Found out, that TT-02B can have a slipper as well. I wonder why there isn't an official Tamiya part, seems like XV-02 slipper would fit after couple of modifications to the spur shaft... Link to a Japanese blog that describes how it's build.
  8. For that price, you can get TT-02BR, which comes with sealed diffs, CVDs, aluminium shocks and other hopups. At that point, I'd say it's better car than DF-03, plus it has better parts availability.
  9. It is more track focused car, but the long arms allow for some extra ride height after some modifications, plus you can get uprights from XM-01 for extra ride height setting.
  10. It was the same with DB-01. The limiters are there, because the base version ships with dogbones, which have quite limited steering anglem. Once you get CVDs, you can remove them. Or play with them as a setup feature.
  11. Great, it'll be nice to see a full option variant 😁 I'd guess they'll be same as XV-02, as most of the other parts.. but it is weird that they're not listed as an option (and that it came stock with XV-02) It should fit, it fits to TT-02, but the short outdrives might become an issue. This is something I hate about Tamiya.. You lose a spacer, look up the manual and description says just "A15", because it comes from a plastic tree.
  12. Just saw this in a Facebook group: And found some older photos from build: As expected, some cuts have to be done.. but they can be masked by the engine model.
  13. From the series "why Tamiya haven't thought of that?", I finally tried whether I can run a single propshaft for multiple wheelbases, since my design allows for the propshaft to stick out of the bevel housing - this is an L propshaft on M wheelbase. In the same way, M-propshaft could be used for the shortest wheelbase.
  14. I'm afraid that's still a bit too wide, if XM mounts are 32mm, you'll need around 24mm to fit between the arms (assuming the arm end is 8mm in diameter). XV-01 gearbox, which is designed around those mounts, is 20mm wide.
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