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Old 08-14-2012, 10:50 PM   #16
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Associated tc4 (and the likes) hands down !!!
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Old 08-15-2012, 05:43 AM   #17
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A700
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Old 08-15-2012, 06:22 AM   #18
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We were running open gearing in VTA and my Xray T3 was pretty quick at 4.0 FDR. We then switched to 5.0 FDR and it was like trying to drive a wet paper bag around the track. I went back through the car and stiffened the chassis/suspension up and the car came back alive again with this new set up.

If your car seems a bit slow and you've done everything possible with motor and gearing, try stiffening up the ride and see if it helps.
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Old 08-15-2012, 07:30 AM   #19
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Out of all the belt drive cars I've owned. The smoothest and most free was the Kawada SV-10. The only car that's more free is a shaft drive, ie tc3, tc4, etc.
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Old 08-15-2012, 09:30 AM   #20
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Quote:
Originally Posted by DARKSIDE View Post
Another thing I do is clean my pulleys as well as soak my belts in Ragu.
Wait.

What?

Ragu?

You soak your belts in tomato sauce?
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Old 08-15-2012, 10:24 AM   #21
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An interview of Oleg babitch, 10 years ago. According to him the differences between Tc's drivetrains are close to negligible.

http://www.overrc.com/courses/course...protorusse.htm

I have many TC's, most of them belted and a few tc3's as well, and my photon has a really free drivetrain. I actually choose to leave my bearings greased because I don't like the " dry " feeling of lightly oiled ones- not to mention lifespan. The slowest motor I use is a 13.5 though. I understand you have really slow motors and you have tried to rule out many potential binding factors, but what would seem more accurate is a measurement of the efficiency of the dirivetrain when rotating, with a load.

Have you tried a rigorous back-to back testing with two cars, your photon vs another one setup similarly , just to isolate the drivetrain factor ? Interesting thread btw.
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Old 08-15-2012, 10:53 AM   #22
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Does that need to be a 4WD..? If not...Tamiya F103GT....2WD direct drive TC.
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Old 08-15-2012, 11:11 AM   #23
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You are all guessing.

Every TC are different depending on how they put together and maintained.

Remove the pinion gear and put two TC cars for comparison side by side on a incline 4x8 board/door and release them both at the same time. The first one that rolls to the end wins. Turn on the car so that you can still steer it straight.
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Old 08-15-2012, 11:47 AM   #24
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The smoothest and freest belt car I even seen is the Losi JRXS Type R. The most free drivetrain I seen has easily been the TC3 or TC4 when guys have worked the spacing on the gears. Damn TC3/4 drivetrain would spin freely for what seemed forever compared to any other car.
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Old 08-15-2012, 01:00 PM   #25
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+1 TC3 perfect for Johnson 540 or similar clases
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Old 08-15-2012, 11:17 PM   #26
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Quote:
Originally Posted by chensleyrc1 View Post
Out of all the belt drive cars I've owned. The smoothest and most free was the Kawada SV-10. The only car that's more free is a shaft drive, ie tc3, tc4, etc.
thats right, i feel that is true too. remember beating all the other cars in a spec motor class back in 2001. Still is damn smooth today.
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Old 08-16-2012, 05:35 AM   #27
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You cant really compare a belt driven car to a shaft driven car with the "see how long the wheels keep spinning" test.

A shaft driven car will have much more momentun due to the heavier weight of the drive train parts, and thus keep spinning for a longer time. Kinda like putting heavier wheels on a car and it will be able to spin for a much longer period of time. . . .

The only good way, thats not even that good, is to do as others have said, and push the care on the groubd and see how far it goes. . This method is still not accurate as you never will be able to push with exactly the same force twice, plus the heavier drive train of a shaft will still provide more momentum once the force has been applied.

As a direct answer to your question, I would say that any of the top level tourers can be made very free and smooth, but I have found this easiest to do with XRays, likely due to more precise cnc work. My tamiyas always needed a slight shimming between the bulkheads to move smooth enough.

For the record, the car I have had that did best in the "spin the wheels with motor out" test was a tt-01 :-D that should prove beyond doubt that this method is less than adequate for proper comparrisson.
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Old 08-16-2012, 08:36 AM   #28
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The real test is in the amount of energy burned to rum each car... If your motor keeps overheating with the same gearing as someone else, running the same class, then you might consider loosing up your drivetrain a bit.....
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Old 08-16-2012, 08:41 AM   #29
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Don't mind the spelling in my previous post, you know what I meant.......lol....
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Old 08-16-2012, 10:14 AM   #30
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Anybody remember running Hyperdrive belt drive systems instead of gears? Why was gears faster?
My reason is the contact patch of the gear compared to the wrap of a belt. More contact = more friction. Which is why, I think, that gear/shaft drive is more free.
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