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Re: CS Ratio/ FDR's/ Overdriver Percentage Calculator

Posted: Sat Jan 29, 2011 5:23 pm
by beetledrift
thanks :)

Re: CS Ratio/ FDR's/ Overdriver Percentage Calculator

Posted: Thu Feb 24, 2011 5:57 pm
by chrisrex
this was awsome and a great help

Re: CS Ratio/ FDR's/ Overdriver Percentage Calculator

Posted: Fri Apr 01, 2011 3:14 am
by CuBe
thats, what i am searching for.
Big thanks! good work!

Re: CS Ratio/ FDR's/ Overdriver Percentage Calculator

Posted: Thu May 19, 2011 5:29 pm
by Dr.Fate
Thank you!

Re: CS Ratio/ FDR's/ Overdriver Percentage Calculator

Posted: Fri May 20, 2011 4:15 am
by CuBe
mmh i have a question..

I use the three belt version.
Image
i Have problems with the front ratio.
I think thats not the correct value..or my brain thinks wrong...^^ its possible, too ;)

So...29/18 mußt be 2.17 why does the Value get bigger if i change the "middle" numbers....is that right?

Sorry...if thats a stupid question :D

Re: CS Ratio/ FDR's/ Overdriver Percentage Calculator

Posted: Fri May 20, 2011 10:34 am
by tokeyo83
CuBe wrote:mmh i have a question..

I use the three belt version.
Image
i Have problems with the front ratio.
I think thats not the correct value..or my brain thinks wrong...^^ its possible, too ;)

So...29/18 mußt be 2.17 why does the Value get bigger if i change the "middle" numbers....is that right?

Sorry...if thats a stupid question :D


Changing the middle pulleys is like changing the front set of pulleys. The front ratio is combining the front ratio and middle ratio. If you set the middle pulleys to the same values the front ratio will be 2.17, but since you're under gearing the front with the middle pulleys your front ratio gets higher. Is that your setup on your R31?

Re: CS Ratio/ FDR's/ Overdriver Percentage Calculator

Posted: Fri May 20, 2011 12:16 pm
by CuBe
Ah ok. But the middle Ratio has nothing to do with the rear ratio!? and why not...

Yes, thats my setup in this moment.

Re: CS Ratio/ FDR's/ Overdriver Percentage Calculator

Posted: Sat May 21, 2011 3:39 am
by tokeyo83
CuBe wrote:Ah ok. But the middle Ratio has nothing to do with the rear ratio!? and why not...

Yes, thats my setup in this moment.


It's kinda either or. I multiplied middle ratio to the front ratio. You can also not multiply the front ratio/middle ratio, but divide the rear ratio from the middle ratio and still get the same numbers. Your rear ratio would be smaller, like how the front ratio got bigger in the calculator :lol:

Re: CS Ratio/ FDR's/ Overdriver Percentage Calculator

Posted: Sat May 21, 2011 12:19 pm
by woody_294
Sorry if this comes across as a little dense, but what is the point of the CS FDR? What does it tell you?

Re: CS Ratio/ FDR's/ Overdriver Percentage Calculator

Posted: Sat May 21, 2011 1:30 pm
by Davis
tokeyo83 wrote:It's kinda either or. I multiplied middle ratio to the front ratio. You can also not multiply the front ratio/middle ratio, but divide the rear ratio from the middle ratio and still get the same numbers. Your rear ratio would be smaller, like how the front ratio got bigger in the calculator :lol:


But then the CS Ratio is still wrong. - Let´s say front ratio is FR, middle ratio MR and rear ratio is RR . The formula would be FR*MR/RR for the CS internal ratio, right? - In your table the MR value is multiplied twice though. Once directly with the FR and once more for the CS internal value. - - - If I correct that in the table, the value for CS internal is 1.66. ... Which makes sense, since the back wheels are spinning 1.66 times faster than the front ones - Not 2.61 times.

It´s confusing with three belts and I discussed that quite long with CuBe yesterday, not being able to figure out what´s wrong with the calculation. - But I believe I got it ^^ ...

Re: CS Ratio/ FDR's/ Overdriver Percentage Calculator

Posted: Sat May 21, 2011 2:29 pm
by tokeyo83
woody_294 wrote:Sorry if this comes across as a little dense, but what is the point of the CS FDR? What does it tell you?

CS FDR is the Final Drive Ratio for cs. This is to Help you find a Spur and Pinion combo so you don't fry your motor/ESC. For reg drifting/touring each car has a set internal (ie. Yok MR4-TC SD is 2.35 internal ratio, and the HB Cyclone S is 2.43). With CS each chassis now has a different internal ratio depending on how much you change up your internal gears (CS Ratio). The Calculator just plugs everything in so you don't have to :lol:


Davis wrote:
tokeyo83 wrote:It's kinda either or. I multiplied middle ratio to the front ratio. You can also not multiply the front ratio/middle ratio, but divide the rear ratio from the middle ratio and still get the same numbers. Your rear ratio would be smaller, like how the front ratio got bigger in the calculator :lol:


But then the CS Ratio is still wrong. - Let´s say front ratio is FR, middle ratio MR and rear ratio is RR . The formula would be FR*MR/RR for the CS internal ratio, right? - In your table the MR value is multiplied twice though. Once directly with the FR and once more for the CS internal value. - - - If I correct that in the table, the value for CS internal is 1.66. ... Which makes sense, since the back wheels are spinning 1.66 times faster than the front ones - Not 2.61 times.

It´s confusing with three belts and I discussed that quite long with CuBe yesterday, not being able to figure out what´s wrong with the calculation. - But I believe I got it ^^ ...


I see it *-| Thanks Davis nice catch :up:

CS Cal updated

Re: CS Ratio/ FDR's/ Overdriver Percentage Calculator

Posted: Sat May 21, 2011 4:42 pm
by woody_294
Ah ok thanks, so it's comparable to an FDR on 50/50?

Re: CS Ratio/ FDR's/ Overdriver Percentage Calculator

Posted: Tue Jul 12, 2011 5:41 am
by Fabio_Floripa
hi guys. i have a question....
if i use 40/13 front and 15/27 rear
or 40/16 front and 15/22 rear
i'll have 1.7 of ratio on bolth....
have any diference if i use one or another?

Re: CS Ratio/ FDR's/ Overdriver Percentage Calculator

Posted: Sun Jul 31, 2011 12:29 pm
by sarf2k4
I wanna know something quite crucial over here, do we calculate the ratio with cs difference ratio or just the rear ratio? I got a lot of words that I just had to calculate with the rear ratio

Re: CS Ratio/ FDR's/ Overdriver Percentage Calculator

Posted: Wed Nov 16, 2011 5:55 am
by marshun
i am a bit confused as i have geared my motor way down. i usually like to have my electronics running as cool as possible (old habit)

im running a novak sport. it says to run a 15-20 tooth pinion.

what i have
12t pinion, 90t spur
gear ratio: 7.5
front fdr: 17.6
rear fdr: 8.82
cs fdr: 15

motor gets warm but doesnt get hot. im fine with that. but i'd like to be cooler.
esc is cold and stays cold. it does have a fan just as insurance

question, could i be over revving the motor and thats what makes it warm? i'd like my motor as cool as possible.

thanks for the excel sheet!

Re: CS Ratio/ FDR's/ Overdriver Percentage Calculator

Posted: Wed Nov 16, 2011 10:30 am
by tokeyo83
marshun wrote:i am a bit confused as i have geared my motor way down. i usually like to have my electronics running as cool as possible (old habit)

im running a novak sport. it says to run a 15-20 tooth pinion.

what i have
12t pinion, 90t spur
gear ratio: 7.5
front fdr: 17.6
rear fdr: 8.82
cs fdr: 15

motor gets warm but doesnt get hot. im fine with that. but i'd like to be cooler.
esc is cold and stays cold. it does have a fan just as insurance

question, could i be over revving the motor and thats what makes it warm? i'd like my motor as cool as possible.

thanks for the excel sheet!


how long do you run for?

Re: CS Ratio/ FDR's/ Overdriver Percentage Calculator

Posted: Wed Nov 16, 2011 11:00 pm
by marshun
several hours. lol. i know it seems silly to want to run the motor cooler (you can still touch it and it wont burn ya at all. its just really warm. almost hot) but its just what im aiming for

Re: CS Ratio/ FDR's/ Overdriver Percentage Calculator

Posted: Thu Nov 17, 2011 4:02 am
by tokeyo83
On one pack? With my Zippy 4000mah batteries i can run for 30-40 min and the motor is warm. 8.5T motor and 2.0 ratio w a 8.5ish CS FDR :D

Re: CS Ratio/ FDR's/ Overdriver Percentage Calculator

Posted: Thu Nov 17, 2011 4:27 pm
by marshun
on several packs. 3-4 packs usually.

8.5?! wow. thats a ton. tonight i will gear up a little and see how it runs.

could i see your gearing set up?

Re: CS Ratio/ FDR's/ Overdriver Percentage Calculator

Posted: Thu Nov 17, 2011 6:33 pm
by tokeyo83
Yok DP at 2.0 ratio (I switch from 1.7 - 2.0 and stick w the same spur/pinion)
Untitled-1.png

Re: CS Ratio/ FDR's/ Overdriver Percentage Calculator

Posted: Thu Nov 17, 2011 6:39 pm
by marshun
thanks a bunch!

makes me wonder if something is wrong with my motor. gonna try and service bearings and try that out.

Re: CS Ratio/ FDR's/ Overdriver Percentage Calculator

Posted: Fri Feb 10, 2012 5:51 pm
by Stalwart
I'm not sure if i should create a separate topic for this, but i wrote a CS Calculator iOS app. ;)

Some features:
  • 2 belt and 3 belt (OTA) chassis support
  • FDR ratio calculation
  • iPad support
  • No ads, it's completely free!
  • iOS 4.2 support

:!: FDR is wrong for TeamMagic E4 chassis (because it's 3 belt, but rear motor)

Your feedback is welcome! :up:

Get it in the App Store

Image Image

Re: CS Ratio/ FDR's/ Overdriver Percentage Calculator

Posted: Fri Feb 10, 2012 5:55 pm
by tokeyo83
Naisu!!! :up:

Re: CS Ratio/ FDR's/ Overdriver Percentage Calculator

Posted: Fri Feb 17, 2012 6:14 am
by Stalwart
iOS Countersteer Calculator 1.0.1 released, should now (finally!) work on iOS 4.2. Can anyone with iPhone 3G (non-S) or older iPod Touch report if it really does? PM or use "compose email to developer" button in-app ;)

Re: CS Ratio/ FDR's/ Overdriver Percentage Calculator

Posted: Wed Mar 28, 2012 3:16 am
by CuBe
Very nice! And now it would be perfect to transform it into an android app...
There are many android-users out there ;)