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  • TFX IROC racing

    Last night our local group tried out the TFX cars with RRR Ferrari bodies. Prior to the race, I had adjusted the shoes, scored the brushes, oiled the cars, and cleaned the tires in dish soap and water. Cars ran great and based on lap totals and times, very close in performance. We ran 2 races with them. We noticed the traction improved through the 2 races so I think some more track time will get the tires working better. Cars were smooth and quiet. They drove similar to a skinny tire car, but with a bit more traction. Very well executed design.
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  • #2
    I noticed a similar effect. My track has gotten a great deal of use lately so now it is really in top shape. The track is now in its oval condition, which is not ideal for tire testing however. I ran some laps yesterday and the stock tires held up very well as the laps went by. Previously they went off quickly while the aftermarket tires that I tried lasted a lot longer. I made up a couple of rear axle assemblies using TFX axles and CNC 0.170" DF wheels, one has a 15 tooth crown gear and one has a 19 tooth crown gear. With the 19 tooth crown gear the car was just over 0.2 seconds slower around my 35 foot MaxMrax oval.
    With the stock rear axle assembly and 0.352" OD tires the car was a bit faster than with the DF wheels and 0.354" OD tires. It looks like the folks at OS3 did some testing before they settled on the 0.352" diameter.
    Last edited by RichD; 11-03-2021, 06:55 AM.

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    • #3
      The new OS3 offerings are just what the doctor ordered. IROC city here we come. We've done a few iROC races of the TSX by themselves and they are the closest to RTR i've ever seen. These are a welcome addition to the pancake chassis buffet. Not as coasty as I am used to racing, but we'll figure out that part.

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      • #4
        As the gears wear in, etc., I think the cars free up a bit. Taller tires will give you more coast, but will also degrade the handling. Another option is to switch to weaker magnets. They will give you more coast, but may decrease top speed.

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        • #5
          Originally posted by tonesua View Post
          The new OS3 offerings are just what the doctor ordered. IROC city here we come. We've done a few iROC races of the TSX by themselves and they are the closest to RTR i've ever seen. These are a welcome addition to the pancake chassis buffet. Not as coasty as I am used to racing, but we'll figure out that part.
          Yet another option is to lessen the brush spring tension. I did this with one of my TFX to achieve more coast. If you go this route be advised that it may be difficult to "go back" to the pre-adjusted amount of tension. I have found that if I'm running two wire with no option for brakes, it's best to leave the brush spring tension alone. If you are wired for brakes, then you have the option of dialing it back in via your controller. If you do decide to experiment with the tension, go at it very conservatively and check your results often rather than making a large adjustment at once.

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          • #6
            I have been running my TFX car with a small amount of brakes dialed in. If you have a controller that is wired for brakes but lacks a brake adjustment it is easy enough to add one, a 100 or 250 ohm potentiometer should work well. For most HO cars a lot of people simply leave the red brake wire disconnected.

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            • #7
              That may be the case in HOCOC and for people primarily racing at home, but people attending bigger events like the Fray, The Ohio cup, the Halloween Havoc, and the HOPRA Nats, are at a minimum hooking up the brake wire and in the majority of cases using some amount of brake.

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              • #8
                The Fray essentially forbids using brakes. The rules say the tracks will only be wired with 2 wires. No terminal for brakes, no ground wire for digital controllers.

                RACING PROTOCOLS – GENERAL
                All tracks are six lanes
                All tracks will be powered with 20 volts
                All tracks are two wire only, no brake wire
                Last edited by Axle; 11-11-2021, 03:20 PM.

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                • #9
                  I stand corrected. I was looking at the controller rules which I think have been updated:

                  CONTROLLERS Only the track power supply shall power the cars, A controller cannot store power nor can it interfere with the track power supply or with the operation of another racer’s car or controller.

                  In any case, the fact is as the cars have gotten faster, more groups are allowing brake. This past weekend at the Halloween Havoc, the overwhelming majority of drivers were using brake in at least one class.

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