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1/9 Scale Nitro Rally/Touring Car:

Kyosho DRX (Radio Controlled Model Review)


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History, Info (and How To Set-up Tips) for the Kyosho DRX:


  Released by Kyosho in 2009, the 4WD DRX Rally Car Chassis , was available in ReadySet and Kit formats, with a number of bodyshell options, including, the SUBARU IMPREZA WRC 2008 - # 31042, CITROEN C4 WRC Rallye de France Tour de Corse 2008 - # 31043, Lancia Stratos WRC - # 31044, MITSUBISHI LANCER EVOLUTION VII WRC - # 31046 and 2010 FORD FIESTA S2000 - # 31050.

  Three variations on the DRX chassis were also available. The DRX R246 Specification - # 31045, the DRX R246 Spec V2 - # 30148 and the DRX Kyosho Cup Edition 2012 - # 30149.

  The basic design is shaft driven, on an formed plate chassis, with gear differentials, coil spring over oil filled dampers, dogbone drive-shafts and a full set of ball bearings.

Kyosho DRX
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  To race the Kyosho DRX, it needs to be tuned to perfection for better stability, precise steering and provide enough grip to keep you on the track when going around tight bends at high speed. Even the smallest adjustment can change the feel of a car and our simple to follow instructions will guide you to the best Set-up to get you to the front and keep you there.

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★ Kyosho DRX R246 Spec ★
Kyosho DRX R246 Spec Chassis

★ Kyosho DRX R246 Spec V2 ★
Kyosho DRX R246 Spec V2 Chassis

★ Kyosho DRX Kyosco-Cup Edition 2012 ★
Kyosho DRX Kyosco-Cup Edition 2012 Chassis


Buying a Used Kyosho DRX
Touring Car (and What to look for)


   Buying a used Kyosho DRX Nitro Touring Car, or any used RC Model, has a number of advantages. It is generally cheaper than new, ready built and may come with a variety of expensive hop-ups already installed. Cheap, pre-loved bargains are always becoming available. However, depending on the age of your purchase, it may need a little tender loving care before you can take it out on the road.

   The one thing you will always need is an instruction manual. If not supplied with your purchase, they can often be downloaded from the Kyosho website, or purchased separately on eBay. With an instruction manual, any problems with your model Touring Car you may discover can easily be fixed.

Dampers
   When you receive your used Kyosho Touring Car, make a general visual inspection of the chassis, front and rear wishbones, suspension shock towers etc, for any broken parts that may need to be replaced. Then, take a screwdriver and box spanner and check each self tapping screw and nut for security, taking care not to over tighten.

   Next, for those Kyosho models with oil filled shock absorbers, remove them from the chassis and dismantle the coil springs. The damper shafts should push in and pull out with a smooth action. If you feel a jolt as you change direction, this means the oil has leaked out and must be topped up. At the same time, change the O-Ring seals to prevent more leakage. Also check the damper shafts for damage. If they are scratched, change them as soon as possible.

   If the body shell of your Kyosho DRX is broken, ripped or damaged in any way, this can be easily repaired with rubber solution glue. Also, for added protection and if available for your DRX model, fit an under guard to stop dirt and gravel entering the chassis.

Titanium Turnbuckles
   Examine the drive shafts for wear and replace as required. If possible, change them for titanium. The steel shafts wear and bend too easily.

   If you intend to race your DRX Touring Car model at a competitive level, I would also recommend you obtain and fit titanium pivot shafts, turnbuckles, tie rods and steering rods.

   The gearbox of your used Touring Car should be opened up to check for gear wear and lubrication. A thin coat of grease is often used on internal gears and although this is fine for basic running around on the road, if you intend to race your Touring Car at a higher level, this should be removed and replaced with racing oil (ZX1 or Teflon Oil). Of course, this should be reapplied after each race meeting.

Spur Gears
   Gears are a weakness on all Touring Car RC models. Head on collisions can easily damage the gear teeth on nylon and plastic spur gears. Heavy impacts can also loosen the nuts or self tapping screws that hold the Nitro Engine in Position, allowing the pinion gear to pull out of mesh slightly and rip the tops off the teeth on your spur gear. To minimise this possibility, fit bolts with locking nuts to the Nitro Engine mount and remember to check them for security after every two or three runs.

   Ball joints always cause problems. For top level Nitro Touring Car racing, the plastic ball connectors should be checked and if deemed necessary changed after every meeting. A simple thing like a loose fitting connector popping off could easily end your race, so better safe than sorry.

Servo Gears
   The DRX steering servo is also prone to damage. In high speed crash situations, the fragile gear teeth of the servo can be broken off, rendering your expensive servo useless, so be sure to obtain a good quality "Servo Saver". Check out my Servo Information article.

   If body roll on your Kyosho DRX is a problem, handling can be improved with the use of stabilizers, anti roll or sway bars, stiffer tuning springs and, or, thicker silicone oil in the dampers.

Ball Bearings
   If your used Kyosho Touring Car comes with plastic and sintered brass bushings (ring type bearings), check the shafts that run in them for wear. Dust and grit can get into these bearings and abrade the shafts. Therefore, you should replace them all with shielded ball bearings. If the model has been run with ring type bearings, you may have to change all the axles and driveshafts. For more information, take a look at my article, How to get the best from your Bearings.

   Finally, good luck with your DRX model and good racing.


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Or, check out our RC Model Car Setup Guide


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Manufacturers and Brands Catalogued and Listed by RC-Scrapyard.


   At present, the RC Model Manufacturers, Brands and Distributors covered by us are: ABC Hobby, Academy, Acme Racing, Agama Racing, Amewi, Ansmann Racing, ARRMA, Team Associated, Atomic RC, Axial, AYK, Bolink, BSD Racing, Capricorn, Carisma, Carson, Caster Racing, Cen, Corally, Custom Works, Durango, Duratrax, ECX - Electrix, Exceed RC, FG Modellsport, FS-Racing, FTX, Fujimi, Gmade, GS-Racing, Harm, HBX, Helion, Heng Long, Himoto Racing, Hirobo, Hitari, Hobao, Hong-Nor, Hot Bodies, HPI, HSP, Intech, Integy, Jamara, JQ Products, Kawada, Kyosho, Losi, LRP, Maisto, Mardave, Marui, Maverick, MCD Racing, Megatech, Mugen, New Bright, Nichimo, Nikko, Nkok, Ofna, Pro-Pulse, Protech, PTI, RC4WD, Redcat Racing, RJ-Speed, Robitronic, Schumacher, Seben, Serpent, Smartech, Sportwerks, Step-Up, Tamiya, Team-C Racing, Team Magic, Thunder Tiger, Tomy, Top Racing, Traxxas, Trinity, Tyco, Vaterra RC, Venom, VRX Racing, WLToys, X-Factory, Xmods, Xpress, Xray, XTM, Yankee RC, Yokomo, ZD Racing and Zipzaps.

   This is an ongoing project, with new and "lost in time" RC Model Brands being added as they are found and although most of those listed above have been covered in relative detail, some are still being researched and will be completed in the near future.


















My First National

   When I first started in RC, way back in the late 1980s, I would turn up to the weekly club meeting, with my Tamiya Boomerang, transmitter, two sets of crystals, a couple of batteries, a charger and a tool box with a wheel spanner and a few spares.
   It was three five minute qualifying rounds and a final and every month we would have a trophy meeting. The trophies were donated by a two of the older semi professional guys who basically ran the club and over the years had collected what must have been hundreds of trophies and had no space for them anymore. The lure of a trophy always brought out the "not as enthusiastic types" and the small church function room was always packed on those nights.
   About a year in, my collection of B final trophies was beginning to clutter my room and my dad bought me the new Tamiya Manta Ray. That was the big turning point in my RC career.
   From then on it was A finals all the way. Then one day in the summer of 1992 the club organisers (the semi pro guys) asked me if I would like to go to a BIG national meeting way down south in Malvern. I asked my dad and with a bit of prompting he said "why not".
   When we got to that meeting we found there were around a hundred competitors, with ten groups of ten. I was in group "H". a two of my friends went down with us and they were in group "I" so were on just before me.
   I remember that first race like it was yesterday. It was a staggered start and I was away next to last. I had never raced on a proper outdoor dirt track before. My only experience was on indoor carpet, but my old Manta Ray took off like a bullet. Most of the others in my heat were rookies and by the end of the third lap I was up with the leader. He was good very good but I stuck to him like glue. Each twist, turn and jump brought me closer and closer, this guy was fast, but I was faster for a while anyway. A lap before the end my old over worked 1400mah battery, was struggling to give me what I needed to keep up with him and my buggy got slower and slower. I ended up third in that first race, but wasn't about to give up that easy.
   There was a shop at the meeting and straight after the race I nagged my dad to get me a new battery. In those days money was tight and normally before dad would spend anything he would consult my mum, but this time she wasn't there and after watching my performance in that race he didn't need much pushing to get me that badly needed new battery.
   Waiting for the second round seemed to take an age, but when it arrived I was pumped up and ready with steely determination. I was away third after finishing third in the first round, so my duel with the guy who beat me before carried on where it had left off. Two laps in and I was on his tail. He wasn't going to beat me this time. We lapped a couple of back markers and were quickly catching up to a third. He slipped past him in a flash, but when I moved in, the idiot drove straight into me, knocking my Manta Ray on its back. The marshal was oblivious to my plight. I shouted my head of but the marshals eyes were fixed on what I guess was the car of one of his friends in my race. The next thing I saw was my dad, bounding across the track like a gazelle, picking up my car, putting it on the track and giving me the thumbs up. I drove like the wind, passing car after car, slowly working back up to third, where I eventually finished.
   But it didn't end there. Because my dad had ran out onto the track, I was disqualified we pleaded our case and eventually were allowed to continue.
   The third round heat arrived. This time I wasn't going to let anything stop me. My focus was to win that race and beat that guy who had all the luck so far. Because of the previous race I set off last. Car after car was left in my wake, until once more it was me against him. Mano a mano, he saw it was me and he upped his game. Lap after lap we duelled for the lead. Coming into the very last lap I was a nose in front and pulling away. With each corner I could sense the battery was once again giving up and my car started to slow down. Corner after corner I could see him getting closer and closer. we got to the final straight and he was right on top of me breathing down my neck. I held my breath and jammed over the throttle leaver and just crossed the line before him I had won my first national heat race. and it wasn't to be the last.

Check out our RC Model Car Setup Guide






Hints and Tips

Gearing to Win

   Just because you have the latest model, the best available batteries, the most powerful electric motor or nitro engine, doesn't mean you will go out and win everything in sight. The fastest car on the track is rarely the one that wins, it's the one that can accelerate out of corners under control and remains consistent and efficient from the start to the end of a race.

   In days gone bye, all you had to consider was the number of mili amp hours (Mah) in your battery and the current draw of your high powered motor. Gearing for a five minute race was a balancing act. But with the development of the new high capacity batteries, brushless motors and smart ESC, all that changed. Now, gearing is more of a matter of what suits your driving style and how quick your reflexes are on the sticks, the trigger and steer wheel of your transmitter. So, where do you start?

   At your local club track, you quickly find the right combination and set-up for your car by talking to the more experienced members. After a while, as your knowledge grows, tweaking a few things here and there can give you that small edge to keep you competitive. So, it follows that on tracks you don't know, you should talk to the locals there, who may be racing a similar model to your own and adjust your set-up to suit.

   Gearing correctly for any given track is absolutely crucial if your car is to be competitive.

   Too high a gearing may get you in front at the start of a race, but as your motor begins to overheat and lose efficiency, that initial advantage will soon be lost.

   Too low a gearing and although it may get you past your opposition accelerating out of the corners, you will loose that place again on the fast straights. Gearing low will always get you to the end of the race, but it will hardly ever get you on the winner's rostrum.

   Having said that, on tracks you don't know, initially it's always best to err on the side of low gearing. For your first practice laps on a new track, choose a motor that has a reasonable current draw and with a fully charged battery, try a race length run, learn the corners what line to enter and exit, where you can accelerate to overtake and how fast you need to be on the straights to keep up (not overtake) the opposition. After your practice race, check the remaining capacity in your batteries and the temperature of your motor, (keep records of each motor and discover at what temperature a specific motor loses efficiency all this helps when selecting the right gearing.)

   Armed with this knowledge you can then consider how to alter your gearing.

   If the motor is cool (in comparison) and your battery has ample remaining charge, try a larger pinion perhaps one or two teeth more. Don't overdo it.

   An overly hot motor and low remaining capacity battery speaks for itself. The race timed practice run should have given you an insight to this problem. Obviously, in this instance you must use a smaller, less teeth pinion, or start again with a milder, less powerful motor.

   If the motor is hot, but not too hot, the battery has ample remaining charge and you did not notice any drop in efficiency towards the end of your practice run, then you are close to the optimum set up for that particular motor.

   Depending on how competitive that set-up is, you can stick with it, maybe tweak a tooth up or down, or repeat the process with a different motor to get you where you want to be.

For More Setup Information check out my Hints and Tips page.










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