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  • #31
    Originally posted by SouthShoreRacing View Post
    JAG Hobbies also has a very different ready to run chassis.
    Yes they are. wow. they were pulling times close to my wizzard chassis jets and aurora, out of the box. A local to me racer bought three, threw on a HEMP racing body (a Uracco) and we had a quick rundown roundrobin 4 minutes each lane on a 3 lane door sized track. light oil and off we went. they need a little more coast, and that will happen with some laps and laping gears, But still these are great. They aren't a fray car. But if you want to run something almost as fast, get an IROC set.


    • #32
      I got some tire testing with my OS3 TFX car today. I had a Vonco Porsche Carrera GT Fray style body on the chassis. The Lamborghini body that I used for my initial testing actually works better with the car.
      The stock tires are perfectly satisfactory for casual running, but on my track they tend to go off very quickly. I can do a couple of quick laps before the car starts to slide a lot. Before I begin tire testing I wipe the track down with a special dusting cloth, then run a magnet car with sponge tires with a little traction compound on them for about 25 laps, then another car with slip on silicone tires until the grip does not change much as the laps pile up. I run a couple of air purifiers while the testing is going on. I used the tire cleaner that Ed Bianchi makes.
      With the stock 0.352” OD tires I was able to get down to 5.783 seconds on my ~50 foot MaxTrax road course, but within five laps the car was sliding a lot. It became difficult to do a lap where the car did not slide out enough to lose time and the lap times after that were over 6 seconds. At the limit the car would spin out.
      With 344RF tires (0.354” mounted OD) the best lap time was 5.642 seconds and the drop off as the laps piled up was only one or two tenths of a second. There were few spinouts those tires. With 344RSE tires the best time was 5.716 seconds, that was a surprise because they are usually good for another 0.1 to 0.2 seconds less than regular silicone slip-on tires. The car did not get loose as the laps went by, but the front end would come out of the slot at the limit. With 340RF tires (0.350” mounted diameter) the best lap time was 5.675 seconds, as with the other aftermarket tires the lap times did not fall off by much and the car was only slightly loose at the limit. With 340RSE tires the best lap time was 5.621, the times did not increase by much after 30 laps or so and there was not the front end understeer problem that I got with the 344RSE tires. I am guessing that the car has a smidge more magnetic downforce with the 0.004” smaller diameter tires. That would tend to increase cornering speeds while the top speed would go down slightly.
      Note that the aftermarket tires were a little loose on the stock wheels and those wheels were a little too narrow for the tires. A fanatic would probably want to switch to the appropriate CNC machined double flange wheels.
      Finally, I finished up with the stock tires, the lap times did not change from what they were at the beginning of the test session.
      If the stock tires had been able to maintain their best lap time the difference would seem to be slight, but it would in fact be significant to a hardcore racer. During a 12 minute race the stock tires would do 124.5 laps and the best (at least for me) aftermarket tires would be good for 128.09 laps, a 3.5 lap advantage.
      Note that my track favors cars with a lot of top speed and it has few joints to upset a car. On a twisty track, and especially if it was a little bumpy the SE tires would probably have a greater advantage.


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