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Tamiya TRF420 Thread

Old 11-12-2023, 01:27 PM
  #601  
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A little race report
I haven't had much experience with the TRF420 as I bought it and then set it aside because I was focused on the TB-EVO8. For our upcoming local club race I decided to switch to the TRF420, as the rules are very open and most importantly don't require a minum weight. The TB-EVO8 drives well, but it is in race trim around 80 grams heavier than the TRF420 …
At our local club we race with fixed timing, motors (17,5T) all tuned to 19.000 rpm @ 8.4V, same tires and (as mentioned) no minimum weight limit. The field is incredibely competitive, apart from 3 aliens who are two tenth per lap above everyone else, everyone is in the same ballpark. Today we had 16 people at the race and the difference between the fastest overall lap between P4 and P16 was between 0.2 seconds on the fastest lap. Unfortunately I had to forfeit my first qualy after a crash (I am not the best driver) and also was not performing as well as in practice in the next two so I ended up in the C-Final.
But being there meant I could cruise to an overall second in C with a win in the last race. Just to give you an idea how stacked up the field is, in the final race I did 65 laps in 10 minutes which would have put me on 5th place in the A-Final where the 5th running car was doing 64 laps, with a best lap also within a hundredth of mine …
Overall I am happy with the performace of the car, with a better driver it could have placed high in the A-Final But the TRF420 (non-X!) was on pace with all the ARC, X-Ray and Awesomatix the rest of the pack was running.


Last edited by zuqbu; 11-12-2023 at 02:19 PM.
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Old 11-20-2023, 09:04 AM
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Originally Posted by snopro31
does anyone want the 54887 rear toe control ? I still have stock on them pm me
Been looking for these - pming you now.
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Old 12-08-2023, 11:25 PM
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TRF display at 2023 Tamiya Challenge Cup Final Race in Japan this weekend, showing the cars used at the JMRCA All Japan TC Championship two months ago.

More: https://kentech.wordpress.com/2023/1...-special-cars/



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Old 12-09-2023, 09:01 AM
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Old 12-09-2023, 09:51 AM
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Thanks for sharing, can't wait for the inevitable next TRF car. Just hoping Tamiya never releases anything with those awful-looking 3D-printed bumpers
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Old 12-09-2023, 02:19 PM
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Zero Tribe called, they want their conversion back.
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Old 12-15-2023, 08:03 AM
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Default Cheap ARS (maybe too cheap...)

With the rear axis of my TRF420 I have the problems that even though right and left side are built absolutely symmetrical I have different toe readings, sometimes up to 1°. I thought about getting the ARS system but unfortunately it is really expensive (>100€ in Germany) and right now not even available. I thought about a cheaper alternative and designed a flexible hub which I connected with a thread rod to the chassis. From an assembly point of view it seems to work. I used inserts for 1,5° of toe-in and then adjusted both sides to a final toe-in of 2,5°.

From a driving and durability point of view I cannot say anything so far. Obviously the flexibility is not just present in the desired directionJ. It might make up for some interesting behavior of the car…. If it is way too soft I plan to fill the gaps with silicone or similar.

Unfortunately I will not be able to really test the car until April.

Does anybody know if some company has tried such a solution before?


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Old 12-15-2023, 08:08 AM
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Default Just another pic to show the concept


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Old 12-15-2023, 08:22 AM
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If you have a 3d printer … wouldn’t it be easier to design a normal hub but design it to accept hinge pin inserts? Create several inserts with incremental angle differences, going both ways, and use these to adjust your toe for each side.
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Old 12-15-2023, 11:16 PM
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Default rear ARS

Has anybody got a TRF420(X) AND a TA08 to check if the rear TA08 arms would fit a TRF? Maybe the upper arm truangle could be done with some double turnbuckle parts you could mount them on the upper bulkheads?
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Old 12-15-2023, 11:44 PM
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Originally Posted by malkiy
If you have a 3d printer … wouldn’t it be easier to design a normal hub but design it to accept hinge pin inserts? Create several inserts with incremental angle differences, going both ways, and use these to adjust your toe for each side.
Well, I do not have 3D printer and rely on online print services. Don't get me wrong: Even with the original car I was able to get the toe-in to the reading I wanted. I just had to replace the bushings often enough an measure again. I wanted a solution that allows for fast adjustability without replacing parts.

Regards,

Andy
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Old 12-16-2023, 08:46 AM
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Originally Posted by h2e
Has anybody got a TRF420(X) AND a TA08 to check if the rear TA08 arms would fit a TRF? Maybe the upper arm truangle could be done with some double turnbuckle parts you could mount them on the upper bulkheads?
someone on Facebook on the TRF group did make it happen. They didn't follow up with any further details. I don't think the TA08 arms offer a better geometry.


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Old 12-20-2023, 09:34 AM
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whats parts are used to accomplish this ? what car are they from ?
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Old 12-20-2023, 11:12 AM
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Originally Posted by Casey
whats parts are used to accomplish this ? what car are they from ?
They didn't follow up with any further details.
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Old 12-20-2023, 11:40 AM
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Originally Posted by Casey
whats parts are used to accomplish this ? what car are they from ?

From the picture it is using the front turnbuckles from a TRF 414M on the back.
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