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TRF414
This kit is not designed for novice R/C users. The TRF414 chassis kit should only be used by expert R/C enthusiasts. Furthermore, this chassis is not usable in some classes of races. Prior to entering a race, be sure to check the regulations with regard chassis specifications.

TRF414-development history...

Masayuki Miura, Takanori Aoki, and Takahiko Yasui are the brainchildren behind Tamiya's new high-end chassis, the TRF414. From its inception to the final stages of development, these three young designers tell the story of their masterpiece.

It all started with the TRF404X...
Miura Back in 1998, we were challenged by Tamiya America to bring out a chassis that could win high-end R/C races. The idea intrigued us, so we decided to accept it. Since this project was unlike any other Tamiya attempted, we needed to collect a lot of data for development of the prototype, the TRF404X. This version was released in the U.S. under the name TRF414X. Based on performance feedback on that version, we were able to bring out the TRF414.
Yasui With victory in top U.S. races as our goal, we knew there was a lot of research to be done. We finally settled a two-belt, double-deck type chassis, and the type of material for the bulkhead. That layout remains the same on the new TRF414, which was based on these early prototypes (except that the prototype had a full one-way drive train).
Aoki At that point, we were racing the 404X both in and out of Japan, funneling that data into the development of the TRF414X, to be released in small numbers on the U.S. market. We knew that although it would be only a very limited release, we also knew that we had to come out with a truly well crafted chassis for the release. That meant weeks and weeks of painstaking testdrives.
Miura From the length of the suspension arms to the wheelbase, we left no stone unturned in our research. We made so many test runs I totally lost count. TRF404X
Aoki We certainly didn't have much data at the outset. Little by little, by referring to the various set-ups used, and staying true to the initial design concept, we were able to bring out this superb machine. It could be said that the TRF414 was born of this data.

TRF414X-limited release in the U.S...
Yasui All the work paid off when the U.S. release of the chassis was greeted by a very enthusiastic reaction.
Aoki That made us really happy. We also received a very positive reaction with the limited release of 150 chassis in Japan, even though the 414X was relatively unknown at the time.
Miura After seeing that, we realized that we really had a product that could go far, so we started putting our efforts into winning domestic races.
Aoki We entered the 414X in both the "24-hour Touring Car Endurance Race" and the "1999 JMRCA All Japan Touring Car Championships". Despite an accident in the 24-hour race, we managed to finish 3rd. Even after all that racing, its condition hardly deteriorated at all. That kind of sturdy and precise construction was also adopted on the TRF414.
Miura Yeah, but don't forget the final of the JMRCA race! With only a little data, we ended up in 9th position overall, and managed to get a great top speed. We had some trouble, but the research at that race could not have been done without in the development of the TRF414. TRF414X
Aoki A little while after those races, the decision was made to officially release the chassis. We heard a lot of fan demand for its release.

The development of the TRF414 began...
Yasui We finally got underway with the 414, making use of our experience at the JMRCA race. The biggest difference to the predecessor would have to be the replacement of the aluminum suspension arms with the resin variety. This lightened the weight under the springs, improving cornering.
Miura Yeah, resin parts with almost the same rigidity as metal work really well. We were mulling it over for quite a while, but finally decided to develop specialized resin parts.
Yasui There was really a lot of work done on the suspension. When we lengthened the suspension arm to smoothen out the running, the roll center got too high. We made the uprights smaller but getting the right balance was really tough.
Aoki As the test driver, I wanted to set-up the car in pursuit of "maximum possible speed", and spent lots of time getting it. Knowing that we had deadlines for the development, we worked really hard to realized this top speed and also the optimal dimensions for the chassis.
Yasui The design was further complicated by the contrary demands of the other two developers. At the same time I would be told things like, "drop the roll center", "lighten the suspension", or "I want to restrict the tread change so make the diameter of the scrubs smaller". How?!
Miura Yeah, but we knew that if we could make the roll center as low as possible, and give it quick cornering capability, it would be perfect for the race courses of today. Doing that, and minimizing the tread change would make for a very good machine.
Yasui Well, by changing the bearing sizes and length of the uprights, I managed to lower the roll center and lighten the suspension. Also, I put spacers into the 414X to widen it out. That widened out the uprights. I was also instructed to use wheels of 0mm offset, and increase the diameter of the scrubs. This is easy to say, but...
Aoki Yeah, and we also changed the symmetry of the upper deck for racers who want to use the chassis roll to their advantage. We balanced the left/right roll, allowing for an even wider spectrum of setting possibilities.
Miura We also included carbon reinforced resin suspension arms, enabling the user to adjust settings according to the road surface or humidity. The TRF414 allows for an extreme amount of setting possibilities. Every racer has his own preferences, and every course has its own characteristics, so we felt it was imperative to provide a chassis with as much setting potential as possible.
Aoki The preciseness of the parts themselves are extremely high, so it's just a matter of finding the proper settings to unlock the potential of this chassis. The sheer range of setting possibilities might appear bewildering at first, but we recommend users to take the time to get to know the chassis. Taking a little time to find your optimal settings will certainly pay-off when you hit the racetrack.

MAIN STAFF
MiuraMASAYUKI MIURA
Tamiya's Top-Driver, he contributed much of the test-driving and project coordination.
AokiTAKANORI AOKI
Tamiya's main Test-Driver, he collected performance data and contributed largely to the dimensions of the machine.
YasuiTAKAHIKO YASUI
Tamiya's young R/C designer, he used 3D CAD design equipment to turn the vision of the drivers into a reality.



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