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Racing OS3 TFX Cars

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  • Racing OS3 TFX Cars

    Most of the guys in my club have tried the OS3 TFX cars and agreed that we should race them. The hitch is that they are a departure from the existing T-Jet type cars. Three possibilities were considered, we could use them in IROC style races, we could race them in a class by themselves or we could include them in an existing class. Several of us have done a considerable amount of track testing in order to compare them with other cars. We had hoped to run a series of trial races, but we were only able to run a single race on a banked wood track. In the end it was decided to go with the third option and the TFX cars will be run in the class that includes JL/AW Thunderjet 500s and Dash cars.
    The rules for that class can be seen here: Support Classes - HOCOC Slot Car Racing (weebly.com)

  • #2
    Why is the TFX chassis limited to the 16.5 ohm arm when there is a 14.5 ohm arm offered?
    As an FYI, the TFX magnets are not ceramic. They are molded.
    Since the stock gears are required for the TFX, does that include the 19T crown since that is a stock part?
    What is the maximum width?

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    • #3
      Our testing indicated that a TFX car with a 16.5 ohm arm is as fast as a good JL/AW car with a 14 ohm arm. Either the 15 or 19 tooth crown gears can be used in a TFX car. My early testing indicated that the TFX cars would be faster with 15 tooth crown, that was with a car that had a Fray style body. I did my recent testing using a Fairgrounds type body and the lap times were the same on my MaxTrax road course with either gear. I believe that the TFX cars can be run at full Fray/T-Jet SS width. In order to see how a car would run without spending money on aftermarket parts I built two cars that had spacers inserted to get the front track as wide as possible while still using the stock axles. I used CNC DF wheels with Super Tires on the back. Those cars are about the same width as Nostalgia type cars. Once again the performance was the same as for the JL/AW cars that we run. Another club member built his cars with E-Fray style front ends to get the full width and add a little weight. I have not tried that myself. The TFX cars have a lower center of gravity and may not benefit from being wider.
      I was aware that OS3 uses molded "ceramic grade" magnets in their TFX cars. We tested the cars with the standard Gray dragon magnets. I have measured the Red Dragons at 450 gauss, the Gray Dragons at 550 gauss and the Black Dragons at 690 gauss. By comparison JL/AW blue/white magnets are typically around 850 gauss.
      We did not want the TFX cars to be configured so that they would render the other cars in the class obsolete and force everyone to buy new cars in order to remain competitive. The main advantage to running the TFX cars would be that they are fast with a minimum amount of tuning and expense.
      In the future I may build a car with a 14.5 ohm armature and try the Red or Black Dragon magnets.

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      • #4
        Good luck with the class.

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        • #5
          Hi Rich,

          Cool that your club decided to start racing the TFX, it's a way cool platform. We race it all the time and have been for many months. However, our rules are simple, totally stock car, except we allow Black Dragon motor magnets. The reasoning is that most drivers prefer the better handling that comes with the additional downforce. We also run the stock version with the Grey Dragons but only IROC, which most don't really care for.

          We're also trying to get a "Modified" TFX class going. Using Lexan bodies, wider (Fray) stance, independent FE, any rims, any axles, any 16ohm arm, stock gear ratio but any type of material, and only silicon tires. On my tracks, this car is roughly a 1/2 second slower than a good Fray car.

          Anyway, the TFX is amazing. Of course, magnet car guys hate gravity cars but most drivers in our club really enjoy the TFX with Black Dragons.

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          • #6
            Interesting that "magnet car guys hate gravity cars" when 52 people entered the Vintage T-Jet (Fray) race and 41 guys entered the Gravity race at the HOPRA Nats which is pretty much attended by a majority of "magnet car guys". Personally, I race everything including skinny tire T-Jets, Gravity, and up to Neo Mod.

            Also, T-Jets and TFX cars aren't legal in Gravity because they have too much magnetic down force. As you state yourself, you are running Black Dragon magnets for the additional downforce so basically, you are a "magnet car guy".

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            • #7
              Magnets are polarized so not a surprise that it polarizes us humans.



              I think the actual dividing line is added traction magnets. For example: MT cars use motor magnets and do have some drift.
              ​​​


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              • #8
                I'm trying to convince one or two of my Long Island clubs to run them in a spec class, choosing a common T Jet body style to run. I would prefer NOT to use FRAY type bodies, instead using production Aurora, Auto World/Johnny Lightning, ect. sports racer or street stock bodies to have some FUN. We'll see what happens when things start up again in the fall. -- Ernie

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                • #9
                  Here are my TFX cars with Fairgrounds type bodies.

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                  • #10
                    I have an IROC set with the RRR Ferrari bodies. Stock except for adjusting the shoes. Everybody has enjoyed them the few times we have raced them.
                    You do not have permission to view this gallery.
                    This gallery has 1 photos.

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                    • #11
                      Those are nice looking bodies, I could not resist buying one myself. I will have to put it on a TFX chassis, the small diameter wheels on the Fray style chassis that I used do not look right.

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                      • #12
                        The RRR website is so hard to navigate ********* and the reason why I haven't ordered anything. The web admin needs to delete old links and clutter.
                        Last edited by Wet Coast Racer; 07-20-2022, 10:06 PM. Reason: Link removed per SCI Rules

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                        • #13
                          To find the GTO body click Cars-Bodies on the left hand side of the main page. On the next page under the picture of the car click For more details. RRR is not an e-commerce site, you can print out an order form and mail that in with a credit card number or a check or you can call your order in.

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                          • #14
                            For the upcoming HOCOC 2022-2023 season there will be non-sanctioned races for TFX cars besides the ones that are included in the JL/AW class. There will be Hobby Stock races for completely stock TFX cars with 19 tooth crown gears , 16.5 ohm armatures and Gray Dragon magnets and 3D printed NASCAR truck bodies from an ebay seller. The second class is Pro Stock, which uses the rules for TFX cars included in the HOCOC JL/AW class and uses the Butch's bodies that are shown on the HOCOC Facebook page.
                            Last edited by RichD; 08-10-2022, 06:40 AM.

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                            • #15
                              Originally posted by SouthShoreRacing View Post
                              Interesting that "magnet car guys hate gravity cars" when 52 people entered the Vintage T-Jet (Fray) race and 41 guys entered the Gravity race at the HOPRA Nats which is pretty much attended by a majority of "magnet car guys". Personally, I race everything including skinny tire T-Jets, Gravity, and up to Neo Mod.

                              Also, T-Jets and TFX cars aren't legal in Gravity because they have too much magnetic down force. As you state yourself, you are running Black Dragon magnets for the additional downforce so basically, you are a "magnet car guy".
                              Sorry, should have explained better. In our area, we have a few different camps: Guys that do not do Fray/T-Jet cars; Guys that pretty much only do Fray/T-Jets, and a few that do them all. I'm one who does them all. Though I gave up the Fray cars due to the silly Dash magnet lottery system and the fact that I cannot purchase the same rear tires the top contenders have access to.

                              To my surprise, even the guys who like T-Jets, M/T, JL, etc., preferred running the TFX with the Black Dragon magnets. Could have just been track but I have both Viper and Bowman tracks and the general consensus was that they liked the TFX better with the Black Dragons.

                              Both my tracks convert to ovals. So I'm very big on total gravity cars. My favorites are the MG+ without traction magnets and the Retro-Viper. oh, and I love my totally stock TFX IROC fleet.

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