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Old 07-08-2009, 02:02 PM   #1
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Default Roar rules for pinion size?

Is there a rule as to the maximum pinion or rollout for 1/10th scale on road touring cars using 10.5T motors? Im having some trouble with highly overgeared racers at our track having the upper hand. When the rule we use is just motor size.
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Old 07-08-2009, 02:08 PM   #2
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There is no rule pertaining to pinion size in Touring Car. Therefore it is legal for you to follow suit and keep up with them.
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Old 07-08-2009, 02:36 PM   #3
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Originally Posted by spurgear View Post
Is there a rule as to the maximum pinion or rollout for 1/10th scale on road touring cars using 10.5T motors? Im having some trouble with highly overgeared racers at our track having the upper hand. When the rule we use is just motor size.
Why do you think that over-gearing gives them a performance advantage? If you keep overgearing, pretty soon all you do is lose performance and generate too much heat. Over-gearing does NOT give you a performance advantage. Maybe they are just "Better" geared then you. What FDR are they running, and what FDR are YOU running? How big is the track and what is it like?
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Old 07-08-2009, 06:03 PM   #4
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There is no ROAR rules on the size of pinions.since the advent of Brushless motors everything has changed -gearing wise. Does your present Touring car allow you to change your overall Gear Ratio? If it does trying going lower.Get with some of the other drivers out there and see if they can advise you on what to do with your car.With Lipos and brushless just on my pan car I went from a 4:00 to 1 ratio down to less than 2:00 to 1.So it depends on your definition of overgear ratio?Things to consider are your running brushless and round batteries or Lipos- that makes a difference.
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Old 07-08-2009, 06:23 PM   #5
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Is there a rule as to the maximum pinion or rollout for 1/10th scale on road touring cars using 10.5T motors? Im having some trouble with highly overgeared racers at our track having the upper hand. When the rule we use is just motor size.
Roar has no rules on gear ratios...

Coincidently they don't have a class for 10.5 motors anymore, other than mod of course
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Old 07-08-2009, 09:46 PM   #6
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Diffrent motor have diffrent power band, some need bigger pinion than the others.

ROAR can't limit powerband to no one.
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Old 07-09-2009, 07:21 AM   #7
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I've seen too many times people asking what rollout the fast guys are using and when they try it, they get nowhere fast and overheat their motors. The fast guys are fast because they can carry more corner speed which means they can also use a higher gear ratio without putting as much stress on the motor. All I'm saying is that the fast guys are fast because they are fast, not because they can gear their motors 2 teeth higher than you.
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Old 07-09-2009, 07:40 AM   #8
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just to explain gubbs3's post in a bit more detail, the faster your corner speed, the less accelerating the car has to do, to get back up to speed.

In turn, this heats the motor up less, as you are not working the motor as hard, like (for example) when you would from a stand still to a full speed, to a stop, to full speed again etc etc.

you may not be keeping enough corner speed simply because you are approaching the corner wrong, which in turn, costs time.

Study the track and the fast guys, their lap times show you the fastest way around the track, all you've got to do then, is replicate their driving style, gearing and car setup!...
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