CS Ratio/ FDR's/ Overdriver Percentage Calculator

[tokeyo83]

Made this a while ago, got it from MIRO (thank you ) and added my own pictures (pulleys, spur, and pinion ), Front & Rear FDR's, CS FDR, Spur/Pinion Ratio, and the Overdrive Percentage (fixed by QuangVuong )


Now includes 3 Belt Chassis'

CS Ratio(Revised).rar

Update May 21 2011

[stuffcc]

By keepsake, it's MIRO who had made it
Thanks to him, and you

[tokeyo83]

By keepsake, it's MIRO who had made it
Thanks to him, and you

thanks

[pecker]

Thanks for the excel ratio sheet..I hope you guys can give your comment...


CS Internal OVERDRIVE PERCENTAGE
2.14 213.54%

Gear Ratio CS FDR
2.692307692 5.749198718

I'm just to know the root of these term..

[stuffcc]

I'm out (Slipper Clutch...)


The CS/Rear FDR will maybe don't stay like that (maybe put a 24T Pinion to have a 6,5 rear FDR...)


Very pratical !

[Calzone]

Have to add an 18T pinion to get 6,49 FDR, but i tried that and my electronics got freakin hot, not really ideal i think.

[tokeyo83]

Have to add an 18T pinion to get 6,49 FDR, but i tried that and my electronics got freakin hot, not really ideal i think.

what are you running now? and does it run cooler?

[Calzone]

i now run the stock TA05 gearing again(22T pinion). Not sure, but i thought the motor stayed cool with the 22T, but the ESC got hot like hell.

[ILoveMy350z]

i cannot open your attachment for cs-ratio.rar
how can i view this?
thanks

[stuffcc]

Maybe because you don't have the software for open it, for me and other guyz where I've sent the link, no problems...

[danhfvcsd]

Head over to download.com and download the trial version for winzip =)

[Skodes]

Just downloaded this to check my own calculations as I wasn't certain how to work out the CS percentage. As it happens I was right, as I should be after RC'ing for this long, but the reason I was confused to begin with was because a lot of people seem to work it out differently.

What I - and the downloaded spreadsheet - worked out to be 153%, some people would seem to consider only 53%. Surely the countersteer percentage (%CS) should be worked out 'relative' to the front wheels (153%) and not simply 'faster than' the front wheels (53%). To me the "109% CS" in the chap above's signature would mean the rears are only spinning 9% faster than the fronts, so I would term it 209% CS. I can see that the 53% or 109% is the 'overdrive' percentage, fair enough, but it can get confusing when half the people here use one method and half use the other.

I mean I can understand both ways, but I guess what my mini-rant is really asking is; why aren't we all singing from the same hymn sheet?

[danhfvcsd]

numbers and i are serious enemies, so i stay as far away from them as i can -lol- All i am gonna say without confusing myself, is that i see it as being 109% faster than it was i spose? But mainly cause it's just what i am used to now i guess -lol-

i sorta thought most people were doing it like i have anyway?

[Skodes]

Yeah I can see why you might say 109%, the rears travel 109% faster than the front. It's just that on my travels around YouTube and various forums etc I've seen people quote the countersteer percentage both ways. Some say 109% and some would say 209%.

For example my Pro4 with Yokomo 1.5 CS gears when they arrive. I downloaded the file in the first post and put all my numbers in, and the percentage value I get is 153%, but using your method (and I'm not saying there's anything wrong with it that way) it'd be 53%.

I just thought it was a bit curious that there are two ways of putting it was all. So I figured I'd confuse everyone... lol

[tokeyo83]

What I - and the downloaded spreadsheet - worked out to be 153%, some people would seem to consider only 53%. Surely the countersteer percentage (%CS) should be worked out 'relative' to the front wheels (153%) and not simply 'faster than' the front wheels (53%).

that's how i got the CS percentage for the calculator. anything under 100% is referring to the rear wheel doing one complete rotation.

[meiji mrs]

how bout a 3 belt system as in the E4 n nitro cars

standard spec
rear - center .............. center - middle, middle - front
35 - 17 .............. 17 - 17 , 17 - 35

what if i change the center - middle pulleys, lets say 14 - 20 ?
or if i change full front setup 14 - 20, 14 - 38
how to calculate the gearing then

for those who still dont get the picture, E4 front driven by side pulley
it goes like this
SPUR SHAFT - center 17T - SIDE BELT - middle 17T - MIDDLE SHAFT - middle 17T - FRT BELT - front 35T
thanks, im juz a noob

[Sir Slide Alot]

Side belt ratio multiply with front belt ratio.

so to use your example 17/17*35/17=2.059

Lets say you change the side belt rear pulley 14 front 20.

20/14*35/17=2.94

[QuangVuong]

The CS ratio calculator from here calculates the wrong CS ratio.

It does Front Internal / Rear Internal x 100. This calculates the wrong CS percentage.

It should be ( (Front Internal - Rear internal) / Rear Internal ) x 100.

Well I fixed the calculator and it works properly.

CS Ratio(Revised).zip

EDIT: Update on my next post . Includes 3 belt calculator

[tokeyo83]

The CS ratio calculator from here calculates the wrong CS ratio.

It does Front Internal / Rear Internal x 100. This calculates the wrong CS percentage.

It should be ( (Front Internal - Rear internal) / Rear Internal ) x 100.

Well I fixed the calculator and it works properly.

CS Ratio(Revised).zip

thanks

[QuangVuong]

No worries. Will be updating again for a 3 belt chassis.

[tokeyo83]

No worries. Will be updating again for a 3 belt chassis.

i was working on one

hopefully it's correct

3 Belt CS Calculator
cs-ratio for 3 belt chassis.rar

[QuangVuong]

I think your CS internal is right, but the CS percentage isnt.

Well I used you table and fixed the percentage. It should be correct this time.

CS Ratio(Revised).zip

[tokeyo83]

To The Top Again Thanks QuangVuong

[beetledrift]

Thanks for making this excel sheet, it's helpful

I am currently making a topic on our dutch forum, where I explain everything about CS.
If you guys don't mind, I will post this excel sheet there

[tokeyo83]

go for it