1/8 Scale Nitro Oval Car:

Ofna Hyper Sprint Dirt-Oval - 14333 / 14334
Radio Controlled Model

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History and Info:

Manufactured by Hobao and distributed by Ofna in 2009, the 4WD Hyper Sprint Dirt Oval car was available 80% assembled - # 14334 - or RTR - # 14333 - with a Hyper .21 engine, dish wheels and dirt tread tires.

Based on the Hyper 8.5 buggy chassis, the model is shaft driven, on an alloy plate chassis, with 3 x gear type differentials, coil spring over oil filled dampers, anti roll bars, CVD universal joint drive-shafts and a full set of ball bearings.

Ofna Dirt-Oval

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To race the Ofna Sprint Dirt-Oval, 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.

Hyper Sprint - 14333 / 14334
Exploded Views and Parts Lists

Hyper Sprint - 14333 / 14334
Manual

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Radio Controlled Model Accessories:

★ Ofna Hyper Sprint Dirt Oval Chassis ★

Buying a Used Radio Controlled Model
(General Information and Advice)

There are essentially three reasons you might want to buy a used RC model; you may be a collector, looking to restore and display it; restore and sell for a profit; or simply restore and race an iconic vintage car. Personally, I used to get a buzz out of restoring an old clapped-out model, installing modern day electrics and maybe a few hop-ups, then showing the gang at our local club, just how competitive those old models could still be.

Cheap, pre-loved bargain models, parts and spares are always coming up for sale, but once you have made your purchase, the one thing you will always need, is an instruction manual. If not supplied with your purchase, they can often be downloaded from the manufacturers website, or purchased separately on eBay. With an instruction manual, any problems with your model you may discover, can easily be fixed.

Make a General Visual Inspection

Dampers
When you receive your used model, inspect 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.

If your model comes 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.

Check the Body-Shell

A broken, ripped or damaged bodyshell, can be easily repaired with rubber solution glue (I use Shoe Goo). Also, for added protection and if available for your model, fit an under guard to stop dirt and gravel entering the chassis.

Drive Shafts and Turnbuckles

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

If you intend to race your model at a competitive level, for strength and weight reduction, I would also recommend you obtain and fit titanium pivot shafts, turnbuckles, tie rods and steering rods.

Examine the Drive System

On gear driven models, open the gearbox 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, for racing 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.

Drive Belt driven models need them checking at regular intervals for wear, tension and damage. If considered necessary, adjust the tensioning pulley until the belt can be depressed in the centre by no more than approximately 5mm. Also examine the drive pulleys for wear. The pulley 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.

Pinions and Spur Gears

Gears are a weakness on all 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 or 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 problem, if possible, fit bolts with locking nuts to the mount, and remember to check them for security after every two or three runs.

Don't Neglect the Ball-Joints

Ball joints always cause problems. For top level racing, all 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.

Steering Servo and Servo-Saver

Servo Gears
The 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.

Don't Forget those Bearings

If your used model comes with plastic or 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 by the previous owner with bushings installed, you may have to change all the axles and drive-shafts. For more information, take a look at my article, How to get the best from your Bearings.

Finally, good luck with your RC 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, Listed and Reviewed 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 Models and 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.

RC Information and Advice:

Hints, Tips and Information

Choosing a Nitro Engine.

   Once you have made your choice of RC model, you need the right engine to get you where you want to be - out in front.

   Touring / Drift Cars: Nitro powered Touring cars require a specific ability. Your first consideration should be the tail pipe. A number of models will take only a rear tail pipe configuration, but the majority will accept the more conventional side pipe.

   Beginners should consider something with a moderate amount of power and a rotary carburettor for easier controlled handling. For top level tarmac track racing or those with more experience, look for an engine with good low end torque that has a slide valve carburettor to give you fast acceleration out of the corners.

   Trucks and Monster Trucks: Unlike on road Touring Cars, Off Road Trucks and Monster Trucks don't need that bottom end torque, unless you like to do wheelies. So something less powerful with a rotary carburettor will provide you with the smooth acceleration and less wheel spin required for controlled dirt track racing.

For other model types read the complete article ▶ ▶

Hints, Tips and Information

Wheel Camber - for cornering stability

   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.

Read the Complete Article ▶ ▶