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1/12 Scale Electric Monster Truck:

HPI Mini Savage XS Flux - # 106571 / # 106572 (Radio Controlled Model Review)


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History, Info (and How To Set-up Tips) for the HPI Mini Savage XS Flux:


  Introduced by HPI (Hobby Products International) in 2011, the 4WD Savage XS Flux Monster Truck - # 106571 / # 106572 - although classed as a 1:12 Scale, was designed to accept 1:10 Scale Wheels and equipment. The model came RTR with a Vektor Brushless Motor, Waterproof Vapour Pro ESC and TF-40/RF-40 2.4GHz radio system.

  The HPI Racing Mini Savage XS Flux is shaft driven, on a vertical frame chassis, with gear type differentials, coil spring over oil filled dampers, dogbone drive-shafts and a full set of ball bearings.

HPI Mini Savage XS Flux - 1:12 Electric Monster Truck
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  To race the HPI Mini Savage XS Flux, it requires a high level of tuning for improved stability when cornering, to keep it on the track and give you more grip under acceleration. Even the smallest change in your cars settings can make a Big difference. Our simple to follow instruction chart will show how to attain the best Set-up for your personal requirements.

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★ HPI Racing Savage XS Flux Chassis ★
HPI Racing Savage XS Flux Chassis

★ HPI Racing Savage XS Flux Chassis ★
HPI Racing Savage XS Flux Chassis


Buying a Used HPI Mini Savage XS Flux
Monster Truck (and What to look for)


   Buying a used HPI Mini Savage XS Flux Electric Monster Truck, 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 Monster Truck you may discover can easily be fixed.

Dampers
   When you receive your used HPI Monster Truck, 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 Mini Savage XS 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 Mini Savage XS 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 Mini Savage XS Flux Monster Truck 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 Monster Truck 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 Monster Truck 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 Monster Truck 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 Monster Truck 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 Mini Savage XS 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 Mini Savage XS 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 Monster Truck 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 Mini Savage XS Flux model and good racing.


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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

Ride Height

   To allow the suspension on any RC model to do its work properly, it needs to settle in a position that is somewhere between it being able to react to any bumps and holes it may encounter on the track. To do this, it needs to be adjusted to somewhere in-between those limits. That position is termed the ride height and is generally measured with the car race ready, that means with the motor and battery etc installed and is the distance between the underside of the chassis and the ground.

   Simply speaking, determining ride height is dependent on the specific track conditions. For off road models the rule is simple, the bigger the bumps and the deeper the holes, the higher the ride height. On road, the closer the car is to the track, the better it will handle.

   For 1:10 Buggys I generally recommend a starting point for ride height at around 20mm. 1:10 Trucks and Truggys, 30mm upwards, depending on the wheel diameter. For On Road models, as low as possible, but normally the setting is around 5mm.

   Ride height doesn't just affect the way the car handles uneven track conditions, it also influences the way the car handles when cornering. For a stable car, body roll must be kept to a minimum and keeping the ride height low, is by far the best and easiest way to control it.

   Before you begin to set the ride height, it is best to make sure that each pair of shocks are exactly the same length, have the same spring type and same silicone oil weight. Also, if you don't have a ride height gauge of any kind, decide what height you want set your car to and prepare some kind of slip gauge to that dimension, a book, a pen, or anything that measures to what you want. I used an old square plastic servo mount, which was exactly 5mm for my touring car. It may be low tech, but it is just as accurate as any gauge you can buy.

   To set the ride height, the race ready car must be placed on a flat surface. Slide your slip gauge under the chassis and adjust the height by adding or removing tension to the damper springs. This is done on most models by using small C shaped clips, placed over the damper, above the springs, or on a number of top of the range models, this adjustment can be made by screwing a knurled nut on each threaded damper body. As a rule if the springs are compressed by more than 25% they should be replaced by stiffer springs. The gauge should just slide under the chassis on all four corners of the chassis.

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







Hints and Tips

Aerodynamics

   It is commonly understood that weight improves traction. If you have ever seen TV coverage of any kind of full size motor racing, you will have heard the terms, aerodynamics and down force. Well, they also relate to small scale models in exactly the same manner.

   Bodyshell aerodynamics for RC model cars is a science in itself and the wrong one could loose you the race. Back in my day the shell to have for 1:10 on-road, was the Alfa Romeo 156. The bodyshell that came with my Schumacher SST kit was a Peugeot 406, but that soon went into the bin when I got the Alfa. The difference in performance was amazing, but it wasn't a patch on the Frewer, Ferrari F50. The rear wing on that bodyshell was phenomenal; it was the fastest thing on the track, great for club racing, but to my cost, illegal for top level racing. Regulations stipulate that the rear wing should be no higher than the roof of the car, the Frewer wing was way too high, so another one was relegated to the "do not use" box.

   Off-Road models also benefit from aerodynamics and downforce, but to a lesser extent than on road models. The rear wing provides good downforce for better rear end traction and is discussed in detail in one of my other articles.

   Way back in 1994, a company named Tenth Technology produced a 1:10 buggy called the Predator. The design of the car was innovative to say the least, with inboard laydown cantilever operated shocks and extra low, almost flat bodyshell. The most eye-catching element of the design was the wings. Not only did it have a nice large wing on the rear, it also had one of a similar size at the front. It was one of those cars where the idea seemed good and the car was fast very fast and did once win the British Championship. The problem was its fragility. Any small knock damaging the front wing, made it un-drivable.

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










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