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FINETUNING YOUR STOCK AFX CARS FOR
PERFORMANCE
INCHES CAN ADD UP TO MILES
Your stock AFX cars can run better — faster — and your competitors may not even know why!
This is the story of AFX fine tuning:
A brandnew AFX car, straight from the box, is just like an automobile fresh from a Detroit assembly line. It will run well, but performance improves as it becomes 'broken in' and can be made even better by finetuning. In this chapter, we'll take a look at some 'finetuning' steps that are easy to do, yet will make a big dif­ference when the car is on the track.
Speaking of track, consistent good performance begins with a clean track, properly wired to minimize power losses. This is the first step in fine tuning, so see the Chapter on track before you start work on your car. Note especially that the slot must be clean as well, to permit smooth running without deslotting.
The new AFX highperformance track has deep slots so super speeds may be attained. All AFX cars manufactured after 1971 are fitted with reversible guide pins that snap into place. Use the deep slot blade for highest speeds on the new track, or reverse the guide and
use the pin end when racing on tracks made prior to 1972. Make sure the guide runs freely in the slot and has no burrs to slow you down.
The highperformance AFX PLUS powersteering kit contains longer, wider pickups and a steel guide pin with reverse taper. These are worthwhile improvements dis­ covered during development of the AFX GPlus cars.
One of the easiest and yet most significant improvements you can make on your stock AFX cars is to 'runsand' the rear tires. These are cut from sponge rubber and have high spots that cause wheel hop­ ping and poor handling. 'Run sanding' is the only way to remove these high spots and make sure the tires are perfectly round.
The first step is to remove the body by holding the rear end with one hand and pulling the side of the body with the other. Lay the body aside, then remove the rear tires and spread a thin coat of con­ tact cement inside both of them.
Next, scrape the chrome off the rear wheel hubs and apply contact cement to the rims. Replace the tires and let the cement dry for at least 30 minutes. The cement bonds the tires to the hubs so tffat once you true them up, they will stay.
Cement a sheet of fine sand­ paper to a piece of thin wood or cardboard (such as a tabletback). Place your car on the track (or hook it directly to the power sup­ ply), turn up the controller to 'full bore', and touch the rear tires to the sandpaper. True up the tread surfaces, rounding the inner and outer edges a little to prevent flip­ ping, but don't sand too far or you'll reduce tire diameter to the point where the chassis drags on the track rails.
IMPORTANT: Runsand the tires first because you'll have tire dust all over the chassis and, in fine tuning, cleanliness is the watch­ word!
After the rear tires are trued up, check the front ones for outof roundness and replace them if necessary. The stock Aurora front tires are adequate as they are neither so hard that they amplify vibration nor so soft that they 'scrub' and slow you down.
In model car racing, as in any type of racing, you must get to know your machine inside and out. Practice taking it apart often enough so that you can put it together in the dark; when the time comes that you may have to do this in a race, you'll win!

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