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Old 03-18-2014, 03:19 AM   #3856
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When I first build my diff it was abit tight, but then I found out that it wasn't the skimming off the diff there was binding up. It was the small gear, because they was abit tight on the gross pins, reamed them out with my 2 mm hex driver problem solved.
No need to sand all gears and reshim.
Just my 2 cents on gear diff
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Old 03-18-2014, 03:33 AM   #3857
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When you guys are talking of the layshaft binding, are you using the original spur gear or another brand of spur?
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Old 03-18-2014, 04:09 AM   #3858
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Originally Posted by Cp Grafix View Post
When I first build my diff it was abit tight, but then I found out that it wasn't the skimming off the diff there was binding up. It was the small gear, because they was abit tight on the gross pins, reamed them out with my 2 mm hex driver problem solved.
No need to sand all gears and reshim.
Just my 2 cents on gear diff
your probably right but i check everything I'm abit anal i check those gears on the cross pins as well when i go through mine diff every diff is different the injection molding machine making plastic gears isn't perfect they all vary alittle from batch to batch i know i work in plastic extrusion
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Old 03-18-2014, 04:30 AM   #3859
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When you guys are talking of the layshaft binding, are you using the original spur gear or another brand of spur?
no were talking about the out side bearing on the lay shaft pully being binded up by the countersunk washer
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Old 03-18-2014, 05:18 AM   #3860
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Default Gear diff

[QUOTE=mikeygar;

I don't know why you would, the diff, if properly built is super smooth and lasts really long, and the stress on the plastic gears might be too much and may cause failure. Might be worth trying with metal gears :-)[/QUOTE]

Hi mike, thx for the feedback. The reason I ask is that I prefer to use heavier diff oil and by using two gear, it will give me more rotation thru the corner and more forward traction on the straight. Not sure my theory make sense to u. Yes, u are right, yokomo diff are pretty smooth.
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Old 03-18-2014, 07:14 AM   #3861
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Originally Posted by chapmanlung View Post
Thanks for the reply...
Yes I am talkign about the plastic spool that came originally in the box...
He has gone through three of them already..... Luckily I have not broken anything yet....Just want to know what is the issue....
He lost the little ring that goes on the end of the spool....might that have an impact?

cheers
The plastic spool will not take any impact - a slight knock or collision can break it. The ring at the end just helps prevent the plastic from spreading when the drive shaft engages it during accelerating / braking.

Best to either get the yokomo spool or the Spec R spool is very good and about half the price
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Old 03-18-2014, 07:21 AM   #3862
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Originally Posted by Cp Grafix View Post
When I first build my diff it was abit tight, but then I found out that it wasn't the skimming off the diff there was binding up. It was the small gear, because they was abit tight on the gross pins, reamed them out with my 2 mm hex driver problem solved.
No need to sand all gears and reshim.
Just my 2 cents on gear diff
The shimming also affects the pressure on the oring. I've built 4 different diff, each different. Before you build the diff, pin the outdrives in the diff halves with the oring and shim. Rotate the outdrive. If it binds, reshim. If that doesn't work then switch to the Kyosho red orings.

Reaming the planetary gears also helps as well as sanding the flashing off the backs of the gears. Put it all together for an awesome diff. It goes a long way for a consistent handling BD7!
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Old 03-18-2014, 10:10 AM   #3863
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Originally Posted by thesaint View Post
Hi mike, thx for the feedback. The reason I ask is that I prefer to use heavier diff oil and by using two gear, it will give me more rotation thru the corner and more forward traction on the straight. Not sure my theory make sense to u. Yes, u are right, yokomo diff are pretty smooth.
I read somewhere before that the Serpent and Xray guys like to do this. If for 17.5 blinky, then maybe it can be done with plastic gears, but for anything faster, i'd use the metal ones.

Nothing sounds more horrible than a crunched up diff and I've heard plenty from some guys who run Tamiyas here :-)
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Old 03-18-2014, 10:34 AM   #3864
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Originally Posted by mikeygar View Post
I read somewhere before that the Serpent and Xray guys like to do this. If for 17.5 blinky, then maybe it can be done with plastic gears, but for anything faster, i'd use the metal ones.

Nothing sounds more horrible than a crunched up diff and I've heard plenty from some guys who run Tamiyas here :-)
I've been running mod with plastic gears
Most guys I know do as well
Can't speak for Serpent or X ray quality, haven't tried one if those yet
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Old 03-18-2014, 10:47 AM   #3865
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I've been running mod with plastic gears
Most guys I know do as well
Also with only 2 instead of 4 gears? (at least that's what they were talking about. )
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Old 03-18-2014, 11:18 AM   #3866
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Also with only 2 instead of 4 gears? (at least that's what they were talking about. )
Oh I see
What would be the advantage of two steel gears vs: 4 plastic ?
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Old 03-18-2014, 11:24 AM   #3867
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Originally Posted by RedBullFiXX View Post
Oh I see
What would be the advantage of two steel gears vs: 4 plastic ?
Less gear it just make the gear diff lighter and less rotating mass.
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Old 03-18-2014, 11:31 AM   #3868
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Originally Posted by RedBullFiXX View Post
Oh I see
What would be the advantage of two steel gears vs: 4 plastic ?
The idea is apparently this:

Quote:
Originally Posted by thesaint View Post
The reason I ask is that I prefer to use heavier diff oil and by using two gear, it will give me more rotation thru the corner and more forward traction on the straight. Not sure my theory make sense to u. Yes, u are right, yokomo diff are pretty smooth.
But I'm also wondering if that really would do anything different than with just changing to a (matching) different diff oil...

Different... differential... getting difficult with all these diffs

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EDIT:

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Originally Posted by Jochim_18 View Post
Less gear it just make the gear diff lighter and less rotating mass.
Are you sure that 2 metal gears are lighter than 4 plastics?
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Last edited by DirkW; 03-18-2014 at 11:33 AM. Reason: added another reply
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Old 03-18-2014, 11:39 AM   #3869
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The problem with only 2 planet gears is that the diff will unload easier making for inconsistent handling on high grip. It may work on low grip situations but will not work very well on high grip.
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Old 03-18-2014, 12:31 PM   #3870
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Cool

So 4 metal gears, are lighter than 6 plastic gears ?
I'm not convinced of that

Not that this is something I would test, but can someone break out the scale to Bust this Myth please


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