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Old 03-23-2006, 07:55 PM   #8206
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hey...Whats a good stock gearing on the TC4...please keep it on the simple mans terms cause i dont know gearing.
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Old 03-23-2006, 08:04 PM   #8207
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actually good point, i need to know the same thing,
what pinion, should i run with all turn motors
from 7-27t with a 72 spur gear,thanks
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Old 03-23-2006, 08:30 PM   #8208
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depends on track size, how tight it is and what motor you are running

for example running a 28mm rollout with a 27t motor will fry a modified as it will have to work too hard
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Old 03-23-2006, 08:35 PM   #8209
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P2k and Monster horse power on a little bit of everything track.
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Old 03-24-2006, 08:38 AM   #8210
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Quote:
Originally Posted by cars.cars.cars
P2k and Monster horse power on a little bit of everything track.
with stock 72T spur, you'll most likely be running a 24-26T pinion for stock motors...
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Old 03-24-2006, 04:02 PM   #8211
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so, how do you work out the roll out, i got standard gearing in the tc4, so yeah what from there on.
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Old 03-24-2006, 05:17 PM   #8212
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http://www.actmcrc.org.au/technical.htm

there is a rollout calculator, but it is tyre diameter * pie / final drive ratio

correct me if I'm wrong but thats how I think it is
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Old 03-25-2006, 02:01 AM   #8213
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My son will soon drive outdoors in a 27 turns class.
Now I have a TC4 and a FTTC4 to choose out.
What car should go best for driving outdoors with rubber tires?
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Old 03-25-2006, 08:34 AM   #8214
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I just bought the tc-4 and so far my opinion is it was not worth the money. I raced it three races and all three races I broke the exact same parts. It is very hard to control with foams on a carpet oval. broke the little ball mount or whatever it is called that controls the right tire front and the part on the right rear that the axle goes through all three times. I am new so I am not sure what the parts are called yet. LOL! I can say that I wish I could turn back time and save my $350.00.
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Old 03-25-2006, 08:58 AM   #8215
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Here's a little news flash for ya...

Ya smash into barriers (ESPECIALLY at the speeds maintained in ovals) yer gonna break parts. Doesn't matter what car you drive. They'll ALL break. Biggest advantage for a newbie on the TC4 is pretty much 100% parts availability so you can replace the stuff you break, unlike the VERY experienced racer locally (club champ in Touring Stock AND Mod...and 1/12 Stock) who needs a bulkhead for his X-car T2 and the only way to get one is buy another kit.

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Old 03-25-2006, 09:00 AM   #8216
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If you've broken that many parts with a tc4, it's likely you would also break a lot of parts on any other car. I have no problems with mine breaking. If your driving is that bad, is it going to matter whether you've got a tc4, xray T2 or Schumacher mission anyway?

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Old 03-25-2006, 09:08 AM   #8217
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The more I practice the fewer parts I break. I use to break regularly... now parts wear out. Foam on carpet is instant reaction.... Are your skills driving up to the capabilities of the car? Tuning can make it react slower.

I just added a third FTTC-4 and love them.
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Old 03-25-2006, 03:47 PM   #8218
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only part i kept breaking was the rear arms, till i got the nerf bars, havent broken one since, cheers
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Old 03-25-2006, 04:13 PM   #8219
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hey, i used that calculator formula ya gave me, and i keep getting a pinion i need of 6.5, it just aint seem right.
iam using
12 and 13t around 23mm
14 and 15t around 24mm
17 and 19t around 26mm
23 and high rpm stock motor around 26mm
torque based stock motors around 32mm
540 motors around 38mm
currently my car roll out is 26mm and iam using a 17t so that about right, but iam chaning to maybe a 12t and want to see what pinions i need to buy, my spur gear is 72 with interanl ratiop of about 2.5 i thing that what a tc4 is. correct me if iam wrong cheers.
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Old 03-25-2006, 06:17 PM   #8220
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Gotta get your tire diameter in there somewhere or none of this does you any good. That's what's "rolling out".

The math is pretty easy really.

The lazy man's calculation makes use of ratios. You know your current pinion and the rollout it provides. You know the rollout you want, what you need to find is the pinion that gives the rollout you want. Unfortunately you don't give the # of teeth on your current pinion.

Take # of teeth on your current pinion and multiply that by the 23mm rollout you want. Divide that result by the 26mm rollout you have now. The answer in your handy-dandy calculator will be the "ideal" pinion size. It will also likely have a fraction of a tooth so for practical reasons (those fractional teeth play HELL on spur gears) you'll have to round your result. Ideally, buy the pinion that corresponds to CEIL (rounding up regardless of fraction) or FLOOR (rounding down regardless of fraction). From there you can adjust up or down as appropriate.

The problem can certainly be done using pi, your gearbox ratios, etc but you've got enough info (where you are, how you get there, where you want to be) that you can take the lazy mans way out.

Doing the math for fun and assuming your tire diameter is 57mm (this has a BIG effect and your gearing will change substantially between "new" and "worn out" on your tires...and with a 12-turn they'll wear faster yet!!). 57mm diameter gives a 179.1 circumference. 23mm (current travel per motor rev) divided by 179.1 circumference yields a .1284:1 desired total reduction.

.1284 times the 2.5 reduction your gearbox(s) apply gives a .321 net reduction. .321 times 72 tooth spur gives a 23.12 tooth pinion. Round to 23 and redo the math ("outward" this time) and you get a 22.89mm actual rollout AT THAT 57MM TIRE DIAMETER. I can't emphasize enough how this will change depending on YOUR tire diametere THAT RUN!!

Now, had you given your tire diameter I could tell you what pinion you have now. Or vice-versa had you given me your current pinion I could tell you your tire diameter. Ain't math great!!

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