What should my CS FDR be? Details inside.

Post any modifications that you have to get your drivetrain and gearing setup get the most angle out of your chassis.
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What should my CS FDR be? Details inside.

Postby Luke CS-EVO » Sun Nov 06, 2011 11:51 pm

Ok here is my setup.

Im currently using a 9.5T / 5208kv Yokomo BL-SP2 brushless with a 86 spur and 25 pinion.

Where should i be aiming my FDR for?
I believe my ESC is getting a little warm, with a 20T pinion my motor gets super hot, with 27T pinion my ESC gets super hot.
Now im running a 25t with fans on both my ESC and motor but i think this is not fixing the real problem, just a bandaid.

If know what FDR my motor should be as i can adjust my spur and pinion to suit.

On the Yokomo motor tables its has the proper gear ratio 適正ギヤ比 for a 10.5t is 1:6.5 so for a 9.5T i think it should be 1:6.8 but how do I use that to find out my FDR.

fdr.jpg



Thanks gents!
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tamiya
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Re: What should my CS FDR be? Details inside.

Postby tamiya » Mon Nov 07, 2011 7:23 am

usually i'd go by the "5.897" figure and rough rule of thumb say it should be about 6-8:1

however gut suggests your spreadsheet is wrong... its a OTA R31 right?
Which means the 86 spur is direct to the 22 pulley and you've got additional leverage
which results in Rear FDR = 3.96:1

yeah gearing is sky high, no wonder motor is warm. Try smaller pinion &/or larger spur.

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Re: What should my CS FDR be? Details inside.

Postby apique_14 » Mon Nov 07, 2011 9:17 am

try to get the Rear FDR between 6.5 to 7 by changing your spur and pinion.
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Re: What should my CS FDR be? Details inside.

Postby Luke CS-EVO » Mon Nov 07, 2011 8:00 pm

So your saying the CS FDR does not really mean sh**, its the rear FDR i have to be worried about?
If thats the case a 22t pinion should bring it to around 6.7 rear FDR.

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Re: What should my CS FDR be? Details inside.

Postby tokeyo83 » Mon Nov 07, 2011 9:45 pm

Try a 19T pinion, CS FDR should be 8.88. I'm running 2.0 ratio and my CS FDR is 8.5 and motor (8.5T) runs runs warm when it's cold and warmer in the summer, run time is 30-40min (4000mah lipo). As long as your motor temps don't go above 160*F your good. Anything below 160*F is fine :D If you are hitting 160 go higher CS FDR(bigger number). But if you are hitting high temps after just 5 min then something is wrong :Think:
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Re: What should my CS FDR be? Details inside.

Postby valentin » Mon Nov 07, 2011 10:03 pm

Tokeyo83 has a good point. If you are noticing high temps in a short period of run time then there is something wrong.

In my opinion, shoot for what fits you. Target what will give you optimal performance yet balance it with whatever amount of time you would like to run. For example, if you want to run a whole battery pack (which can be quite a long time with drifting), then gear to run at optimal performance for that period of time. Due take note of the temps though. Warm is ok. Hot is a no no. Just like stated above, anything below 160*F you should be fine but you're pushing the motor temp wise. Anything over 160*F for most motors will damage the magnets of the motor

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Re: What should my CS FDR be? Details inside.

Postby Luke CS-EVO » Mon Nov 07, 2011 10:28 pm

Ok I will give the small pinions a go. I like to run for whole batteries at a time.

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Re: What should my CS FDR be? Details inside.

Postby digi16v » Tue Nov 08, 2011 4:11 pm

sorry to say but you cant use the stock spur and pinion that SJ sends you. the FDR is WAY OFF using them
if your using stock 86 spur use a 14-18 pinion. this should give you a better FDR.

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Re: What should my CS FDR be? Details inside.

Postby Luke CS-EVO » Tue Nov 08, 2011 5:55 pm

I know I cant use the stock spur and pinion sizes thats why I started this thread. I think your suggestion is actually dangerous, how a CS FDR of 12 would actually be beneficial for my 9.5T motor I have no idea butthat is the FDR I would get with a 14T pinion.

Like the others said I think a 19-20 will be fine and that will bring me in the mid to high 8 region, will test when I get a chance.

Thanks everyone.


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