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1/5 Scale Electric Buggy:

HPI Baja 5B Flux - # 107684 / # 107685 (Radio Controlled Model)


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History, Info (and How To Set-up Tips) for the HPI Baja 5B Flux:


  Introduced by HPI (Hobby Products International) in 2012, the 2WD Baja 5B Flux Buggy - # 107684 / # 107685 - came RTR with a Castle Creations 2028-780KV brushless motor, Mamba XL2 ESC and 2.4Ghz radio system.

  The HPI Racing model is based on a narrow channel alloy chassis, with a gear type differential, coil spring over oil filled dampers, dogbone drive-shafts and a full set of ball bearings.

HPI Baja 5B Flux - 1:5 Electric Buggy
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  To race the HPI Baja 5B Flux, 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 Baja 5B Flux 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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★ HPI Racing Baja 5B Flux Chassis ★
HPI Racing Baja 5B Flux Chassis

★ HPI Racing Baja 5B Flux Chassis ★
HPI Racing Baja 5B Flux Chassis


Buying a Used HPI Baja 5B Flux Buggy (and What to look for)


   Buying a used HPI Baja 5B Flux Electric Buggy, 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 back yard.

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

Dampers
   When you receive your used HPI Buggy, 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 HPI 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 HPI Baja 5B Flux 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 Baja 5B Flux 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 Baja 5B Flux Buggy 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 Buggy 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 back yard, if you intend to race your Buggy 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 Buggy 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 Buggy 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 Baja 5B Flux 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 HPI Baja 5B Flux 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 HPI Buggy 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 Baja 5B Flux model and good racing.


For More on how to Setup your Buggy, 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

Roll Center

   One of the least understood settings on RC model cars is concept of roll center. The simple definition of roll center is a point in space that the chassis rolls from side to side as the car maneuvers around a corner.

   To calculate roll center you have to consider things like the height of the axles, the inside and outside camber link positioning, the length of the suspension arms and the location of their inside pivot point. Sounds complicated doesn't it and in truth it is.

   On all RC model cars, most of the cars weight is above the chassis and the center of gravity of the car is not only from front to rear, but also from top to bottom. This point is called the "true" center of gravity and is the point around which the weight of the car will want to roll from side to side, but it is the roll center of the chassis that the chassis will actually roll around, not the center of gravity.

   Once you have determined the positions of roll center and center of gravity, you can calculate the "roll moment". It is this that determines how easily the chassis will roll from side to side.

   But what does all this mean? I hear you ask. Well, it gives you some insight to what changing the position of your camber links can do to the way your car handles.

   Lowering the outside camber links, lowers the roll center, so conversely, raising the outside link position raises the roll center.

   Lowering the inside camber link position raises roll center and raising the inside camber link position, lowers the roll center.

   Any of these adjustments will affect the "roll moment" and therefore you have some control of body roll.

   The length of the camber link bars affects the speed of roll center change as the car driver around corners. Longer links increase the rate of change. Shorter links decreases the rate of change.

   Adjustments to the roll center will change the way the car reacts in a number of ways.

   Lowering the front roll center gives more steering under acceleration, but the car is less responsive. Ideal for smooth high grip tracks, with long sweeping corners.

   Raising the front roll center provides less steering when accelerating out of the corner, but the car feels more responsive and is less prone to traction roll. Best for high grip twisty tracks.

   Lower rear roll center improves grip under acceleration, but reduced grip when breaking. Helpful to avoid traction roll as you enter the corner and tracks with low grip to increase traction.

   Higher rear roll center gives you less under acceleration, but the car is more responsive. Works for high grip twisty tracks to reduce traction roll.

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







Hints and Tips

Camber

   Camber is described as the angle of the wheel as you look at it directly from the front or rear of your car and if set correctly will improve your cars cornering ability considerably, by providing increased traction. This simple to make adjustment is considered by many to be one of the most effective changes you can make to your car for better handling.

   Positive Camber is when the top of the wheel is angled outwards. Negative Camber has the top of the wheel angled inwards.

   First of all, get yourself a good camber gauge. All adjustments to your cars camber setting should be made with the car in race mode that means the motor, battery etc in position in the chassis.

   To check the angle of an On Road car, it must have the ride height already set to around 5mm. Place the car on a perfectly flat surface, position your camber gauge against the side of the wheel you are checking and take the camber angle, normally this is between -1 and -3 degrees negative. Next, put a small 1mm thick piece of card under that corner of the car and push the corner down until it touches the card. In this position, check the angle again. It should be between 0 and -0.5 degrees negative camber. If not, pick up the car and put it back down on the flat surface, check and make adjustments, using the turnbuckle, that you consider are needed to achieve your goal. Keep checking and adjusting and repeat for all four corners. What you are aiming for is an angle that will provide your car with the maximum amount of rubber on the track on high speed corners.

   Off Road cars can be adjusted in a similar manner to that described previously, with the ride height set at around 20mm, but in place of the card, use a small booklet or something around 5mm thick. The optimal camber setting is a little more difficult to find for off road cars and depends generally of the track surface you are racing on. Slippery tracks generally require less camber because of reduced suspension movement when cornering, whereas high grip tracks require more camber to compensate for inertial induced body-roll. Depending on the particular model, this setting can be anything between -1 and -5 degrees sometimes more. Check your model manual for details.

   Be aware that for all model types, too much negative camber can reduce straight line traction, but with a good setting for any particular track, the advantage it gives, that of vastly improved cornering stability, far outweigh any negative effects.

   For beginners, this setting is by far the easiest to experiment with. Just take the car out on the back yard and with a few simple turns of a turnbuckle you will soon learn just what difference a small change in your cars setup can do to change its handling ability. Good luck and good racing.

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










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