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Old 12-06-2007, 04:08 PM   #1
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Default Internal Ratio's

I have been reading more and more about Internal ratios on rctech and other forums, and it seems to becoming a more important discussion.

From what I have copied/read (and correct me if I am wrong)

Serpent: 1.95
Kyosho: 2.05
Xray: 2.05
MUGEN: 2.15
Magic: 2.55

What are the advantages of having a higher or lower internal ratio?

Can the internal ratio on a car be changed?

Does a certain ratio to suit one track over another (longer vs shorter tracks)?

What effect does it have on an engine (acceleration / top end)?

Thanks.
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Old 12-06-2007, 08:23 PM   #2
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Quote:
Originally Posted by implusepro View Post
I have been reading more and more about Internal ratios on rctech and other forums, and it seems to becoming a more important discussion.

From what I have copied/read (and correct me if I am wrong)

Serpent: 1.95
Kyosho: 2.05
Xray: 2.05
MUGEN: 2.15
Magic: 2.55

What are the advantages of having a higher or lower internal ratio?

Can the internal ratio on a car be changed?

Does a certain ratio to suit one track over another (longer vs shorter tracks)?

What effect does it have on an engine (acceleration / top end)?

Thanks.

The ratio is very important. The higher the number the better acceleration (keeping in mind what gearing you are using.)

Not sure of the other cars, but serpent does not have an option to change the internal ratio. It would have to be a modification. The smaller/tighter the track the better it is to have the ability to have a 2.5 versus a 2.0. If the track is a sweeping track with high speeds, the benefit is not really there.

Hope this helps,

DJ Apolaro
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Old 12-06-2007, 11:47 PM   #3
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Quote:
Originally Posted by implusepro View Post
I have been reading more and more about Internal ratios on rctech and other forums, and it seems to becoming a more important discussion.

Can the internal ratio on a car be changed?
Thanks.
The internal ratio is a integral part of the final drive ratio and you tend to change the gearing by changing the spur and pinion. It is the prime reason that when you compare cars the spur gear tends to be a different size. For instance the pinions in the MTX4 are much smaller than the MTX3 as the MTX4 has an higher internal ratio (I think) but at the end of the day the same final drive ratio is obtainiable.

If you are using a rollout calculator the internal ratio as well as pinion spur and typre size are combined to calculate the rollout.

Hope this helps.
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Old 12-07-2007, 02:40 AM   #4
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Here is a quote from RayJ off the MTX-4R forum which sums it pretty well...

Quote:
Having a lower internal gearing ratio allows you to go lower on 1st and 2nd gear pinions, and at the same time keeps the final drive ratio the same. What this also means is that you get faster into the powerband of .12 motors and the spool up time of the drive train is also less. This translates to faster acceleration corner to corner.
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Old 12-07-2007, 03:41 AM   #5
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I think it has more to do with the gyroscopic efect of several shafts.
The rpm's on the wheels and crankshaft you can not change only lighten them for a less effect but the shaft of the gearbox and its gears can make a change....
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