RCScrapyard ► Iconic Vintage Radio Controlled (RC) Model Car Archive ► Mugen Seiki MRX4R.
RCScrapyard Radio Controlled Models
Flags

1/8 Scale Nitro Rally/Touring Car:

Mugen MRX4R - H0075 (Radio Controlled Model Review)


Navigation: Sitemap  ▶  Manufacturers  ▶  Mugen Seiki

History, Info (and How To Set-up Tips) for the Mugen MRX4R:


  Introduced by Mugen Seiki circa 2006, the 4WD MRX-4R Racing Car - H0075 - is belt driven, on an alloy plate chassis, coil spring over oil filled dampers, rear dogbones, with front universal joint drive-shafts, 2-speed transmission and a full set of ball bearings.

Mugen MRX4R - 1:8 Nitro RC Touring Car
▼ Scroll Down for More Images ▼


  To race the Mugen MRX4R, it has to have the best settings for your driving style and provide you with excellent handling and stability. The smallest changes can make a huge difference in the way your car performs on the track and our comprehensive instructions will help you to find the best Set-up to get you where you want to be.

ebay









Gas/Nitro Engines Body Shells Radio Transmitters etc Tires Wheels/Rims Electronic Speed Controllers Battery Packs / Chargers Electric Motors












Items For Sale:






Flags

★ Mugen MRX4R Chassis ★
Mugen MRX4R Chassis


Buying a Used Mugen MRX4R
Touring Car (and What to look for)


   Buying a used Mugen MRX4R 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 Mugen 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 Mugen 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 Mugen 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 Mugen MRX4R 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 MRX4R 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 MRX4R 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 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 MRX4R 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 Mugen MRX4R 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 Mugen 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 MRX4R model and good racing.


▼ Scroll Down for More Articles and Advice ▼

Or, check out our RC Model Car Setup Guide


^ TOP ^












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

Anti Squat

   Described as the angle at which the suspension arms pivot in relation to the chassis, Anti Squat effects traction under acceleration.

   Considered to be at its most effective from a standing start, the handling and stability of the majority of modern day On Road and an increasing number of Off Road models, can be improved with a certain amount of anti squat, normally no more than around 3 degrees.

   Basically, more anti squat gives you more traction, but after a certain point, that advantage is lost and the car will become unstable when turning into high speed corners. For Off Road models anti squat can also improve how the car handles on bumpy tracks.

   Less anti squat allows the car to drop at the rear under hard acceleration, providing less traction, but more stable when cornering. If no anti squat is present, with the lower suspension pivot shaft being parallel to the chassis, steering will be sharp and can induce some over-steer.

   Most manufacturers have some anti squat on their car kits provided as standard and hop-up parts are generally available to change the anti squat angle, but more often, on a wide range of models, all that is needed is a washer or two under one side of the suspension pivot block. However, if the block is held in position using self tapping screws, it may be prudent to change them for slightly longer ones.

   If you are thinking of trying a different setting on your car, not just for anti squat, always remember to only make one change at a time. Too many changes to your set-up made at one time, can make it difficult, if not impossible, to determine which change you made gave you the result you desired.

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







Hints and Tips

Wheels

   When it comes to wheels, the majority of people tend to go for what looks good, something that will make their car stand out from the crowd, but are they the best wheels for you when it comes to winning races on the track?

   Quite a number of years ago I read an article in an RC magazine about RC model wheels and how important it is to have the right ones on your car. I was so impressed by that article that I immediately sold off all my old wheels and bought a batch of new ones why? Read on.

   In order for a tire to maintain grip, it needs to preserve the downward pressure through the cars suspension onto the road surface. To do this, not only must the wheels be concentric, they have to be totally rigid. So, if you accept that premise as fact, you will realise that the majority of the flashy wheel designs available for all types of RC model cars are not exactly what you might call rigid. In point of fact, they are down right flimsy.

   If you take a good hard look at some of those multi spoked pressure injected plastic wheels you have in your car box, you will soon see what I mean. Just take one in your hand, squeeze it just a little and you will realise how weak and feeble the construction of these cheap and nasty things are. Looks aren't everything. If you want to be up there with the best you have to strive for the best and that doesn't necessarily mean the most expensive. There are lots of wheels out there at reasonable prices that can give you that rigidity you need, okay, they might not look pretty, but they will perform better and give you that extra one percent that could mean the difference between winning and losing. You have to ask yourself, what you want your car to be, the one that everyone admires for its flashy good looks, or the one that gets you to the top.

   So there you have it, rigid wheels are the thing to go for. They may be heavier and provide a more dynamic rotating mass, requiring more braking than those flimsy lightweight wheels out there but then, that is a whole new subject.

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










On/Off Road
RC Models:

Radio
Equipment:

Accessories: