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1/10 Scale Electric Rally/Touring Car:

Yokomo MR4TC BD5 World Spec (Radio Controlled Model)


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History, Info (and How To Set-up Tips) for the Yokomo MR4TC BD5 World Spec:


  Introduced by Team Yokomo circa 2010, the 4WD MR4-TC BD5 World Spec Touring Car - MRTC-BD5W - was belt driven, on a carbon graphite double deck chassis, with front fixed axle, rear ball differential, coil spring over oil filled dampers, universal joint drive-shafts, anti-roll bars and a full set of ball bearings.

Yokomo MR4TC BD5 World Spec - 1:10 Electric Touring Car
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  To race the Yokomo MR4TC BD5 WS, it must be fine tuned to improve handling, provide responsive steering and give you the grip to cruise around corners at high speed, without slipping off the track. Small adjustments can make a Big difference and our step by step procedure, will guide you to the best Set-up for your individual driving style.

  Using plain language, our guides will help you choose the right Electric Motor for your MR4TC BD5 WS and achieve the best Gearing, for any racetrack, to suit your particular needs.

  Discover what the top racers do to reduce friction and get more from their Bearings with a few common sense hints and tips. Learn how to avoid Radio interference, and we reveal the secrets of Charging your Batteries to give more punch, duration and increased performance.









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★ Yokomo MR4TC BD5 World Spec Chassis ★
Yokomo MR4TC BD5 World Spec Chassis

★ Yokomo MR4TC BD5 World Spec Chassis ★
Yokomo MR4TC BD5 World Spec Chassis

★ Yokomo MR4TC BD5 World Spec Chassis ★
Yokomo MR4TC BD5 World Spec Chassis

★ Yokomo MR4TC BD5 World Spec Chassis ★
Yokomo MR4TC BD5 World Spec Chassis


Buying a Used Yokomo MR4TC BD5
Touring Car (and What to look for)


   Buying a used Yokomo MR4TC BD5 Electric 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 Yokomo 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 Yokomo 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 Yokomo 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 Yokomo MR4TC BD5 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 MR4TC BD5 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 MR4TC BD5 Touring Car model at a competitive level, I would also recommend you obtain and fit titanium pivot shafts, turnbuckles, tie rods and steering rods.

   Drive Belts need checking at regular intervals for wear, tension and damage. If deemed necessary, adjust the tensioning pulley until the belt can be depressed in the centre by no more than around 5mm. If the belt was slack, also examine the drive pulleys for wear. The teeth should provide a well seated fit for the belt teeth and not be rounded on the corners. If the belt teeth do not fit snugly, change the pulleys as soon as possible. For top level racing it may be prudent to replace all belts and pulleys 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 Electric Motor 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 Electric Motor mount and remember to check them for security after every two or three runs.

   Ball joints always cause problems. For top level Electric 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 MR4TC BD5 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 Yokomo MR4TC BD5 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 Yokomo 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 MR4TC BD5 model and good racing.


For More on how to Setup your Touring Car, check out my Hints and Tips page.


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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.


















Hints and Tips

Soldering Battery Packs

   Nicad and Nimh batteries sometimes come as six separate matched 1.2 volt cells. These of course have to be soldered to each other in series to produce either a side by side stick pack, or a two times three cell saddle pack.

   Special copper, or silver plated straps must be used to make up these packs and each strap must be prepared before attempting to solder it to the battery cell, by placing a blob of solder at each end of all the straps needed.

   A jig to hold the cells vertical and side by side is advisable. Using electrical solder, with a flux core (flux aids the flow and adhesion of the solder) heat your soldering iron to as hot as it will go. Then with the stick of solder touching on the end of the cell, touch it with the iron. What you want it to spread evenly on the central part of the pole of the cell. Count to 3 seconds. If it doesn't melt the solder in that time, your iron is not hot enough. Battery cells are notoriously very fragile and susceptible to the very high temperatures soldering requires. Anything longer than four or five seconds direct contact with the iron can cause damage to the crystal structure in the cell, so be wary.

   When you have solder on each end of each cell, line them up in the jig, positive to negative and dab a spot of flux on the soldered cells, then position your straps, with the solder coated side faced down, touching the solder on the end of the cell. Now place your hot iron on the strap. Heat will transfer through the strap and melt the solder on the two faces. Again, count to 3 and you should feel the strap drop slightly as the solder fuses with the solder on the cell. Repeat this for each cell on both sides to produce your desired configuration. Finally solder your two wires, previously prepared with connectors, to the pack. Do not solder wires with bare ends to your pack. If these wires were to touch and short out, you could effectively kill your expensive battery pack I use Red for positive and Black for negative, but so long as you know which is which electrical equipment does not like the battery to be connected the wrong way.

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







Hints and Tips

Soldering

   In the sport of Radio Controlled racing, there are a number of things you have to learn to get you up there with the best. One of the most difficult, for those with little practical skill, is the art of Soldering.

   For their 540 silver can motors, Tamiya provide two wires, typically green and yellow, soldered to the endbell, with two bullet connectors to plug into the speed controller. While this is fine for bashing around the back yard, as you advance to a higher level you will soon find just how inefficient this method is.

   Motor wires are best soldered directly to the ESC. That way no energy is lost through high current draw. Some of the top drivers at one time even used to solder their batteries directly to the ESC, but these days with connectors such as "Deans" and "Power Pole" this isn't necessary but I still wouldn't use any kind of connector for the motor.

   There are basically two kinds of solder. Plumbers solder which is made up of 60% Lead and 40% Tin, where as electrical solder is the opposite 40% Lead with 60% Tin. NEVER use plumbers solder for your battery, ESC or motor joints. Lead melts at 327 degrees C, where as tin melts at 232 degrees C. The higher Lead content of plumbers means it melts at a higher temperature, which is not good for your battery cells. Also, Tin has almost half the electrical resistance of lead, so with the higher Tin content of electrical solder, electricity flows much easier to your motor.

   More recently, due to the European regulations for lead use, lead free solders are becoming more widely used well, in Europe anyway. The problem with lead free is the melting temperature it is much higher, making it difficult to produce reliable joints.

   Lead, as we know, is a poison to the body if ingested or inhaled in certain quantities. so when using lead based solder, try not to inhale any of the fumes and always wash your hands after completing your work. One of my friends also wears cotton gloves, but I find these cumbersome.

   For me lead / tin solder is far easier to use and if used with care, has less potential to damage your batteries having a much lower melting temperature.

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










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