If they are scratched, change them as soon as possible. At the same time, change the O-Ring seals to prevent more leakage. If you feel a jolt as you change direction, this means the oil has leaked out and must be topped up. The damper shafts should push in and pull out with a smooth action. Next, for those Ofna models with oil filled shock absorbers, remove them from the chassis and dismantle the coil springs. Then, take a screwdriver and box spanner and check each self tapping screw and nut for security, taking care not to over tighten. When you receive your used Ofna 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. With an instruction manual, any problems with your model Touring Car you may discover, can easily be fixed. If not supplied with your purchase, they can often be downloaded from the Ofna website, or purchased separately on eBay. The one thing you will always need is an instruction manual. 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. Cheap, pre-loved bargains are always becoming available. It is generally cheaper than new, ready built and may come with a variety of expensive hop-ups already installed. The voltage of the pack has no influence on the Amp rating of the pack.Buying a Used Ofna DM-1 Touring Car (and What to look for)īuying a used Ofna DM-1 Electric Touring Car, or any used RC Model, has a number of advantages. Ideally you want the lipo to provide at least 30% more power (for speed runs) than what the ESC is rated for so it can supply a smooth voltage curve, the closer the match to the ESC the more likely you will be effected by ripple current, Any lower than the rating of the ESC the pack will expand (puff) and potentially catchfire/let off toxic smoke or explode (very rare). ie 5000mAh = 5Ah) and multiplying that by the discharge rating (C rating) of the pack ie: Lipo Amp supply is calculated by taking the Amp rating (not mAh. The majority of ESC's come with a couple of capacitors fitted as standard but there is never any harm adding more when it comes to high drain applications like speed racing. (this can cause ESCs to catch fire in some cases). If the wires are longer than 15cm between lipo case and ESC its recommended to install a capacitor bank to make sure the ESC is sufficiently protected from ripple voltage. When that happens its common for ESC's to fail and potentially catch fire. so if the motor is amp hungry it will simply pull what it needs regardless of what the controller is rated for. The motor is in charge of how much power it needs, the ESC is simply there to control the flow. Some points to bare in mind when selecting equipment: That said always buy the highest Amp rated esc you can get as running taller gearing can pull lots of power. For example:Ĥ000KV motor on 3s (use the voltage under load so that's approx 3.75V per cell)Īlthough both RPM are similar you will get more power (torque) running a lower kv motor, generally speaking the higher the voltage the less amps the motor should draw also. The lower the KV rating of the motor the more torque you get. Quite often the best way of building a purpose built speed car is to find a donor chassis (preferably one that has gear diffs), then design a longer chassis this has the benefits of allowing you to fit more cells on the chassis as well as making it more stable, the trade off is then the issue of making a home made body. When building a car its important to consider the aerodynamics of the car, if there is too much of a step at the front of the body the car will simply flip over around 100mph as it gets forced over the air pressure building up in front of the car.īare in mind Touring cars and Pan cars are designed for 2cells so you need to seriously consider how easy it will be to strengthen the drive line, going upto at least a 32dp (ideally mod1) pitch on the spur and pinion, and in the case of belt drives you can hunt around and get thicker belts. Ground Clearance - you need at least 10mm (especially if you're planning to run on the surface we use at ROSSA or on road Availability of tyres (foams) in 40 shore rating or above There are a few important things you need to consider when building a purpose built speed car: 4wd would be more stable, but its more complicated to modify for high speed.
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