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Old 07-04-2005, 12:40 AM   #1
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Default My brushless evo4 ms

Hi, I have finished building up my Evo4 ms along with a Kontronik twist-55 brushless motor and a Schulze U-Force 75 esc to support my car with decent power. What gear ratio is recommended for the car with this setup? I'm using 64p 34t pinion and 64p 96t spur which give around 6.4:1 FDR. Thanks whether you're going to reply or not.
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Old 07-04-2005, 01:07 AM   #2
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Gearing for touring cars really depends on the track.Small track you should gear it using smaller pinons or larger spur.And vice versa for large tracks.

So what you should do is to go down to your local track and test.See whether your motor reaches peak rpm way before the end of the long straight.If is peaking before the long straight ends then you need to use a bigger pinon until the optimum gearing is found.Remember only increase your gear size by 1 at a time.

Another thing is if your motor has not enough torque in the infield then decrease the pinon size.This is the case for the motor not reaching peak rpm at the end of the long straight.

Smaller pinon/ larger spur= faster accerleration but lower top speed.
Bigger pinon/ Smaller spur= Slower accerleration but higher top speed.

Hope this helps.

Nothings beats going down to the track for the actual track test.
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Old 07-04-2005, 07:33 AM   #3
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It really depends on track size. I run a TC4 with the U-force 75 and a plettenberg shadow (6000 rpm/v). I usually go by rollout when figuring gearing, that is, how far does the car roll per revolution of the motor. For large outdoor track that number is usually around 29 or 30 mm/rev. On an indoor track it is usually around 24 to 25 mm/rev. To find rollout do this


D=Tire diameter
FDR=Final Drive Ratio

Or you can go to www.gearchart.com

So if you are running 62 mm tires on your car right now, you are geared just a little faster than I run on a large outdoor track.
Brushes? We don't need no stinking brushes!!!
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Old 07-04-2005, 08:03 AM   #4
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So how did you find your u-force 75/ shadow setup is working? pretty fast huh?
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