How to determine the belt size you need

Post any modifications that you have to get your drivetrain and gearing setup get the most angle out of your chassis.
antinnous
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How to determine the belt size you need

Postby antinnous » Tue Apr 17, 2012 4:58 pm

im not sure if this is correct, but as long as you keep the stock teeth numbers, you should be able to use the stock belt?

for example, the tamiya ta05:
stock:
36t/16t
36+16 = 52t
belt: 113t

a setup that also uses stock belt:
30t/22t
30+22 = 52t
belt: 113t

if that is correct, you can also use:
32t/20t
32+20 = 52t
belt: 113t?

now if my theory is correct...
i wonder, what if we jump 4 teeth larger:
40t/16t
40+16 = 56t
belt: 117t???

can anyone chime in and confirm this?
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Re: How to determine the belt size you need

Postby missionhockey33 » Tue Apr 17, 2012 6:32 pm

I like this theory, I think its a good starting point to determine other belt sizes to fit only the ta05 specifically. For the ta05 you can also change the belts tension from the diff housing so the belt might be +- 2 teeth or something. I dont own one but the theory and experimenting is there for other members.

Theres more info in this post http://csjunkies.com/viewtopic.php?f=7&t=1207

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Re: How to determine the belt size you need

Postby stuffcc » Wed Apr 18, 2012 1:21 am

Yea I found this technical too.
I add the teeth number of the front/rear pulleys (i'll take the same example : TA05) to see if my belts are good or not.

Stock pulleys : 36+16 = 52T

So now, if you want to put CS, the sum of the front or rear teeth pulley will say if yout belt is too long or too short.

If I want a 2,0CS with 40-14 front and 22-32 rear pulleys, the sum of both will be 54T.
So the belts are too short by 2T.
But If I put a 40-12 front 20-32 rear pulleys, the sum of both will be 52T.
Same as stock so you are sure to keep the stock belts !

As missionhockey33 said the TA05 have cams in diff cages so you can adjust the tension of the belt, +-2T I think, it depend of the stock setup...


So yes I can confirm this ;)
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Re: How to determine the belt size you need

Postby antinnous » Wed Apr 18, 2012 7:35 am

awesome, i thought so.

but my real concern is that if i increase the sum by like 4 teeth, should i increase the teeth on the belt 4 teeth as well?

or vise versa, going lower sum by 3 teeth, should i be decreasing the teeth on the belt by 3 teeth?
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Re: How to determine the belt size you need

Postby stuffcc » Wed Apr 18, 2012 8:29 am

As I said it depend of the tension of the belts, cuz on your TA05 you can adjust it with the bulkhead cams ;)

Say if I awnsered or not... :D
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Re: How to determine the belt size you need

Postby antinnous » Wed Apr 18, 2012 9:29 am

after reading it again, i guess you did, haha

thanks!
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Re: How to determine the belt size you need

Postby missionhockey33 » Wed Apr 18, 2012 1:16 pm

p.s: Just make sure everytime you do an experiment, you use new belts, because older belts stretch and i when you come to replace them all your placement will be wrong.

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Re: How to determine the belt size you need

Postby Calzone » Wed Apr 18, 2012 1:24 pm

The way descriped is a nice way that will work most of the time ;) I've got a book here which explains exactly how to calculate the exact belt lenght needed(and thats a hell of a calculation), but indeed, because of the tensioner on the TA05's diffs it doesn't really matter if its a teeth to short or to long.

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Re: How to determine the belt size you need

Postby stuffcc » Wed Apr 18, 2012 2:19 pm

missionhockey33 wrote:p.s: Just make sure everytime you do an experiment, you use new belts, because older belts stretch and i when you come to replace them all your placement will be wrong.


The difference is very small ;)

Calzone wrote:...I've got a book here which explains exactly how to calculate the exact belt lenght needed(and thats a hell of a calculation)...


Yeah I needed to calculate the right belt size I needed for my FBD mod, it's (a little ? :D) harder than an addition...
But it's impossible to do this one for almost drift chassis cuz it's impossible to calculate a belt size when there is a tensioner (not a cam).
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Re: How to determine the belt size you need

Postby Dr.Fate » Wed Apr 18, 2012 8:07 pm

stuffcc wrote:
missionhockey33 wrote:p.s: Just make sure everytime you do an experiment, you use new belts, because older belts stretch and i when you come to replace them all your placement will be wrong.


The difference is very small ;)

Calzone wrote:...I've got a book here which explains exactly how to calculate the exact belt lenght needed(and thats a hell of a calculation)...


Yeah I needed to calculate the right belt size I needed for my FBD mod, it's (a little ? :D) harder than an addition...
But it's impossible to do this one for almost drift chassis cuz it's impossible to calculate a belt size when there is a tensioner (not a cam).



Make a FBD Mod for the DIB! please.........

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Re: How to determine the belt size you need

Postby stuffcc » Thu Apr 19, 2012 12:11 am

Buy/send/lend me one ! :D
Nobuddy in my circle own one...
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Re: How to determine the belt size you need

Postby antinnous » Mon Apr 23, 2012 10:15 pm

thanks for all the replies guys!
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