[bowley]

I just wondered how fiting Scaleauto rs200 with a 22500rpm 430cm/g SC-0029 motor would be result? I know it's ott power wise but could gearing be able to tame it in any way so it would be any good for rally slots?

[Kevan]

By taming do you mean higher or lower gear ratio?

Is that a high mag motor for a magnetic track?

[bowley]

Hi Kevan it's medium mag effect. RE gearing,I wasn't sure if higher ratio (so less acceleration) could make it easier to drive on rally track as with 430cm/g torque would acceleration be too much?

[Kevan]

That's where you're getting confused

3:1 is a higher ratio than 2:1...this give you:

• faster acceleration
  
• lower top speed
  
• more brakes
  

conversely 2:1 is a lower ratio than 3:1...this gives you the opposite:

• slower acceleration
  
• higher top speed
  
• less brakes
  

[bowley]

Ok I get it now I had them wrong way around. I used to race motor cross & enduro bikes & we called fiting bigger rear wheel sprocket or smaller front sprocket lowering the gearing. Anyway would this motor have too much torque or rpm be too high for rally models? If so could tuning resolve it & if so how?

[Kevan]

I have a couple of 18k versions of that motor, me personally I don't like that much power on a Rally stage, I prefer S-can or short can motors but I know some love the NSR King 21 which is similar to that motor of yours.

The only way you'll know is fit it, start at 3:1 and see how it goes.

[munter]

3:1 is a higher ratio than 2:1...this give you:

• faster acceleration
  
  
• lower top speed
  
  
• more brakes
  

conversely 2:1 is a lower ratio than 3:1...this gives you the opposite:

• slower acceleration
  
  
• higher top speed
  
  
• less brakes
  

Interesting how different people see the higher and lower gear thing.
When I drove a manual transmission car top gear was the lower numerically...
3:1 is a lower ratio than the taller 2:1 ratio ......in my play book.

[Kevan]

How to overcomplicate things eh, 1st gear in a car is a higher ratio gearing than 5th gear, I bet there aren't many who race model cars think like that, I've certainly never met one in the 45 years that model cars with gears have been my hobby 

ratio

noun
noun: ratio; plural noun: ratios
the quantitative relation between two amounts showing the number of times one value contains or is contained within the other.

3/1=3
2/1=2

3 is a higher number than 2

I prefer the K.I.S.S. method

[StuBeeDoo]

I'm with Munter on the ratios.  When I was involved with 1:1 rally cars, a 4.75:1 rear axle was always referred to as lower than a 4.375:1.  And a 3.89:1 was higher than both of them.

[Wicker Bill]

In my experience, a big waste.
I purchased a pre-owned MSC RS200. It came with standard 21,500 RM motor, inline configuration. Gearing had been changed to a lower gearing (higher numerically).
At the time I only had a short routed track. Car was an unbelievable handful.
I put in an M3 motor, 17,000 RPM, and went back to stock gearing of 9:27. It made the car driveable.

Stick with the Sprinter Junior motor. At 18K it might be too much, but give it a try. Futz around with gearing before changing to a faster motor.

My two cents worth,
David