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  • RichD
    replied
    My OS3 TFX arrived today, I oiled it, adjusted the pickup shoes, snapped in the guide pin and trimmed it to the proper length. The pickup shoe tension measured 2.8g, the tires were 0.352” in diameter as advertised. The axle, armature shaft and cluster gear shaft holes were the correct diameter and the idler gear was a perfect fit on its post. The armature measured 17.1 ohms at 75°F. The total weight with a Fray Lamborghini body and screws was 18.2 grams. The downforce measured 8.6 grams on my homemade tester compared to 24.3 grams for a 2nd generation T-Dash with Killer Bee magnets. I will measure the TFX magnets when I get a chance. At 18 volts the car read 2.40 on my VRP dyno, my regular cars were already prepped and packed away for tomorrow’s race, I will run some of the pancake cars on the dyno later on.
    I ran the car around my ~50 foot MaxTrax road course without a body using an OS3 All Pro Elite controller, a small amount of brakes was needed. The car ran smoothly with some humming from the gears at higher speeds. The car had good acceleration and top speed. Rear grip was a limiting factor, the car never deslotted, it would just spin out at the limit. The tires did seem to get better as they scuffed in. The best lap time was 5.745 seconds compared to a full race T-Jet SS with silicone on sponge tires at about 5.4 seconds. With an Auto World ’70 Camaro body the car did 5.985 seconds and I had to turn the brakes up a notch. With a Fray type Lamborghini body the best lap time dropped to 5.595 seconds. I intend to try different tires in the future, with more grip the car may need more weight up front, an inexpensive E-Fray type front end might do the trick.
    I was very pleased with the car, it runs great with no tweaks, if we do not run them in a new class we will probably have some for IROC style racing.

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  • RichD
    replied
    My OS3 TFX car is in the mail, I should have it very soon. A fellow club member got several cars yesterday, he did not get a chance to run them yet, but he noted that the gear mesh is good. I expect to be at his place for a race on Sunday, so I can check the cars out in case my car had not arrived by then. I was wondering what the diameter of the rear wheels were. T-Jets have 0.188" diameter wheels.
    It is my intention to evaluate the car as it comes, then see if there might be any minor tweaks that might be done to increase its performance.
    Last edited by RichD; 12-08-2021, 06:35 AM.

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  • RichD
    replied
    If I recall correctly AutoWorld ThunderJet 500 Ultras have an 18 tooth crown gear. If you wanted to use a brass pinion in a TFX car you might need to use a T-Jet crown gear as well if you are looking for a perfect mesh.

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  • mowyang
    replied
    OS3 says the TFX crown gears mesh well with their 11T pinion but not as well with Aurora's pinions so racers experimenting with these different combos have been forewarned.
    Standard tjet crowns have 15 teeth, so that's an easy substitute. The Super II had a 19T crown; not sure if another 19T crown was ever made for the tjet.

    Using a 9T pinion and a 15T crown on the TFX gives a ratio of 3.48:1.
    Using a 9T pinion and a 19T crown on the TFX gives a ratio of 4.41:1

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  • RichD
    replied
    If you used the 15 tooth crown gear the gear ratio would be 2.61:1 with a 12 tooth pinion and 2.24:1 with a 14 tooth pinion. With the 19 tooth crown gear that would be 3.31:1 and 2.84:1.
    I had to think about how to calculate the gear ratios for cars with pancake gears when I wrote my T-Jet tuning article some years ago. I found that it was easier for me if I started with the armature and armature pinion turning at 1000 RPM, in that case for a TFX with an 11 tooth armature pinion the 26 tooth idler gear would be turning at 430.077 RPM, the 23 tooth driven gear and the 11 tooth drive pinion would be turning at 478.261 RPM and the 15 tooth crown gear would be turning at 350.725 RPM. To get the overall gear ratio 1000/350.725 = 2.85.

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  • mowyang
    replied
    Thanks for the gear ratio calculations, Rich. I was curious about that.

    Tinkerers that tjet folks tend to be, a 9, 12, or 14 tooth drive pinion could be installed and used with an appropriately shimmed tjet 15t crown if one really wanted some gear ratio choices in addition to what OS3 provides with their 15 and 19 tooth crowns.

    OS3's gear changes are among the more interesting modifications incorporated into the TFX chassis.

    Leave a comment:


  • RichD
    replied
    In a fit of ambition I calculated the two gear ratios that you can get with the TFX, that would be 2.85:1 with the 15 tooth crown gear and 3.61:1 with the 19 tooth crown gear. For T-Jets the armature pinion is 14 teeth, the idler and driven gears are 24 teeth, the drive pinion can be 9, 12 or 14 teeth and the crown gear has 15 teeth. That would make the possible gear ratios 2.857:1, 2.143:1 or 1.837:1.
    With the TFX you must use a larger diameter tire than you would normally use with a Fray or T-Jet SS car and that would change the effective gear ratio.

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  • RichD
    replied
    I was thinking that OS3 could offer cars in kit form.

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  • RichD
    replied
    The JAG Hobbies TR-3 chassis is a modern higher downforce inline car that takes screw post bodies. The hitch with those is that they have larger diameter wheels and tires so that screw post T-Jet bodies will not fit unless you hog out the wheel openings. There is also the NC-2 chassis for snap-on AFX/Tomy bodies and the DR-1 chassis for 4 gear bodies.
    A new DK-4 chassis for stock T-Jet bodies is on the way, it has T-Jet sized wheels and tires, but it is powered by an inline can style motor.

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  • SouthShoreRacing
    replied
    JAG Hobbies also has a very different ready to run chassis.

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  • Axle
    replied
    Originally posted by MrFlippant View Post
    Is there anything else out there that can compete with it at that price? I wouldn't mind expanding my tiny collection a little more. ;-)
    Dash Motorsports has ready to run cars, with bodies included, in the public store for $29.99.

    For group members the complete chassis (no body) are $14.50 (some assembly required).

    I'm a big fan of the Dash chassis. They are intended to be a close copy of the original T-jet, and the parts interchange between the two. I use Dash parts to restore vintage T-jets. The Dash armatures and magnets have become standard in Fray racing. They come with wide wheels and silicone tires, which is one place there they have been modernized.

    Leave a comment:


  • SouthShoreRacing
    replied
    I received that email as well. While I'm bummed it might take a while to get my order, I'm also very glad to see Jerry has gotten a great response to his new car. I look forward to trying it out. Given the lower design of the chassis, I think it has the potential to be a fast or faster than fray car with a weighted front end and sponge silicone tires. Much will depend on how smooth the gear train is.

    Leave a comment:


  • MrFlippant
    replied
    As I said, I placed an order. The web site did not indicate low/out of stock, though Jim did mention that the orders exceeded expectations. I don't think posting this will be a problem, as it appears to be sent to anyone placing an order right now. So, just to make sure you're aware PRIOR to placing an order, this is the message I just received from Jerry, accompanied by a couple photos showing the piles of chassis and parts being put together.

    OS3 Customers,
    If you have an order pending for TFX cars or parts then this email is for you.

    I wanted to update you on what is happening.

    We launched the TFX on Saturday with 70 cars built ready for sale and parts to build a few hundred more. We had NO IDEA how much demand there was going to be for these cars. We exceeded 500 cars by the end of the weekend and are around 1000 now. We are building these all in house from scratch. With 19 color/wheel combinations and 4 motor/gear combinations there are a total of 76 different cars that can be ordered. What stock we had prepared was not always the combo selected. A few we did not anticipate much demand and found the demand overwhelming. This means we have to go back to preparing the axles and gearplates first so we can put the cars together.

    We are asking for your patience and understanding while we continue to get these orders ready. 1000 cars is no easy feat but we are doing our best. Currently we have only sent out a few orders as all our time has been spent building cars. But as we are building, the orders keep piling up and we end the day further behind where we started. I have been working 19 hours a day since Saturday to try and get caught up. We have decided to list the cars and axles assemblies Out of Stock until we can catch our breath. We have some orders going out tomorrow and will continue to get them out in the order they came in.

    We understand your desire to try out the TFX. We just want to make sure you understand everybody else has the same desire. We hope you will hang in a little longer as we get through this but we understand if you wish to be refunded.

    Thanks

    Jerry
    Note the date of this post, if you're reading this in the future, and assume that with some time between now and when you're reading it, that things have settled down. I'll update when I receive my chassis, and if I get any more information on the status of production/shipping.

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  • MrFlippant
    replied
    Jim did a little presentation during the WWSCC on zoom today as well.
    I'm not an HO racer by any stretch, but I did learn a little during my participation at this year's Quarrel race. I also brought home a Quarrel/Fray car built by Charley Karnes that I look forward to putting down on a proper HO track again in the future. For now, my sectional track will have to suffice. While these are clearly not in that category of cars, they sure look to beat the pants off the Johnny Lightning car I have for comparison purposes. I expect it to run quite nicely, and for a great price as far as I can tell.
    Yes, I bought one just now. Yellow, 20ohm and 19t crown, along with a pack of guides. I look forward to playing with it, and will finally have a third chassis for my third t-jet compatible body. Seems like a great entry level car that will actually drive nicely out of the box, or IROC as previously mentioned.

    Is there anything else out there that can compete with it at that price? I wouldn't mind expanding my tiny collection a little more. ;-)

    Leave a comment:


  • waltgpierce
    replied
    Nice review of the TFX by Jim Rose:

    https://www.youtube.com/watch?v=xWNgOpJfTds

    Leave a comment:

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