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Old 05-26-2015, 02:30 PM   #61
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Hi I load thrust bearing with anti wear grease and place the balls in a poly bag with the grease that comes with the diff bolt upgrade kit cover the balls in grease then build diff as instructions I also use the upgraded bolt and add threadlocked to nylock and superglue nylock into plastic nut holder
So once you put your diff in, do you not rebuild it from time to time or just replace the entire ball diff unit?

I routinely rebuild my M-chassis ball diffs every few months, so was just wondering. Maybe I am not understanding how the ball diff is assembled onto the ABC's.
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Old 06-02-2015, 07:09 AM   #62
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I rebuild diff when it becomes loose or no longer smooth I found ball diff would last longer in my grid as the gear diff would either strip or leak on a weekly basis I am running steel counter gear and ceramic bearings in gearbox
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Old 06-03-2015, 09:05 AM   #63
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just had a run with the ball diff... I found it comes loose after a day's run...
or maybe I turn it too loose in the beginning.. (standard that comes with kit - not the upgrade).. are yours like that?
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Old 06-03-2015, 09:12 AM   #64
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I have not had mine come loose I do mine up tight and threadlock the thread once it's run in I find that it's right setting for me as I don't run a tight diff
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Old 06-04-2015, 01:37 AM   #65
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I was finally able to do some more testing.

I used yellow springs on both ends, which worked quite well. The only problem was that the car bottomed out very easily because of the weak damping. Does anybody use the optional aluminium dampers? As a set of them is nearly half the price of the whole car, I would rather do without them.
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Old 06-05-2015, 07:47 AM   #66
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I use the aluminium dampers version 2 , (the thick ones not thin) , with 350 oil. I used the white or blue springs up front and yellow rear.
I have alumiinium knuckles fitted on each corner. I use sweep tyres up front and spice or pit shimizu rears running on asphalt surface.
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Old 07-10-2015, 02:02 PM   #67
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I may have found another reason for the gear problem: I purchased a new differential housing and found out that one tooth on it is slightly warped, which causes the counter gear to bind when touching the faulty spot. This will damage the counter gear, which in turn will eventualy damage the differential housing.

I donīt think that only the differential housing I bought ist faulty, my original differential was binding at one spot too. It may be a faulty batch, or the moulding abc uses is damaged. This may be the reason why the problem doesnīt occur when using the ball differential.

Btw, a steel counter gear shaft is available at rcmart:http://www.rcmart.com/hobby-25797-st...=595_1124_1666
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Old 07-12-2015, 05:39 AM   #68
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Quote:
Originally Posted by Drachenschorsch View Post
I may have found another reason for the gear problem: I purchased a new differential housing and found out that one tooth on it is slightly warped, which causes the counter gear to bind when touching the faulty spot. This will damage the counter gear, which in turn will eventualy damage the differential housing.

I donīt think that only the differential housing I bought ist faulty, my original differential was binding at one spot too. It may be a faulty batch, or the moulding abc uses is damaged. This may be the reason why the problem doesnīt occur when using the ball differential.

Btw, a steel counter gear shaft is available at rcmart:http://www.rcmart.com/hobby-25797-st...=595_1124_1666
After stripping 2 sets of diff.. I have switched to ball diff instead... After today massive run something something is stripped... Let's see a couple days later when I open up the gambado to see what has stripped...
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Old 07-16-2015, 01:48 AM   #69
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Here is about 10 runs after the ball diff now turns into...
It was running on a HB 3.1 @ 13.5T Motor running with boost and Turbo (all up to max) and running on M car Foam Tires

Now I install another spare ball diff gear and turn off all boost and Turbo (Now in Blinky mode)

Pinion Gear is @ 30T and all spur gears are steel gears(except the BIG Spur gear)

Also something that everyone should look at is EPA (End Point Adjustment) on your remote... Dont let the edges grid your chassis on your extreme left or right... this will also make gear chewing incident happened faster.

I wonder if they make a steel ball diff gear... just let it chew the big spur gear so that it will not cause so much headache to take apart and reinstall....
Attached Thumbnails
ABC Gambado/Grid-img_0356.jpg  
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Old 09-23-2015, 11:01 PM   #70
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Just updated again to everyone...
Just noticed the Grande Gambado only recommend up to 17.5T - this means 13.5 or higher kv are just hope and pray that it will not gear chewed....
(Since Grande Gambado drive train is basically identical)

Thus I have switched to a 17.5T motor @ 0 Timing (Default) with the following ESC (Hobbywing) settings:
Boost: 40 (default 30)
Turbo: 24 (default 25)
Delay 0.1

Hope and pray again - see if any more problems

Also for those running gear diffs... instead of the white grease... I have also put 5000 diff oil in it... I would think that it would probally need to be much higher (like 10,000 - 30,000)

Last edited by otaku521; 09-23-2015 at 11:57 PM. Reason: diff
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Old 09-24-2015, 05:45 AM   #71
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I didnīt realize that the Grande Gambado ist already available.

I wonder if it uses the same gear diff as the Gambado. Maybe we are lucky and ABC produced a reinforced gear diff for the Grande Gambado.
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Old 09-24-2015, 01:04 PM   #72
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I didnīt realize that the Grande Gambado ist already available.

I wonder if it uses the same gear diff as the Gambado. Maybe we are lucky and ABC produced a reinforced gear diff for the Grande Gambado.
Finding from the part numbers... basically everything in the transmission gear box and all the gears are the same as M Chassis Gambado

Here is the manual:
http://abchobby.com/JP/DL/Grande_Gam...al20150825.zip

I guessed that so far only MAYBE options are newer gear ratios using metal?(CNC?) gears 50/25T 50/30T 48T variations

IMHO.. wished that made a metal gear diff or ball diff
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Old 09-24-2015, 01:07 PM   #73
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Here is the final details @ Grande Gambado
http://abchobby.com/JP/page/rc/grande/grandeline.html

Using autotranslator

※ This product has been developed on the assumption 17.5T brushless motor use.
本製品は17.5Tブラシレスモーター使用を前提に開発されております。

thus derived which also means M Chassis is 17.5T as well?

Here is something interesting: using the 48/30T combo @ 31T Pinion FDR is 2.477?!

RC Mart is selling it now @$184 USD:
http://www.rcmart.com/hobby-40500-gr...cPath=420_1176

Last edited by otaku521; 09-24-2015 at 01:09 PM. Reason: added rcmart link - it is available now
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Old 09-24-2015, 01:20 PM   #74
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The gear ratio they noted on that page shows 3.870:1 to 8.571:1 (48pitch).
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Old 09-24-2015, 07:46 PM   #75
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The gear ratio they noted on that page shows 3.870:1 to 8.571:1 (48pitch).
but in the manual it has more variations... maybe it is because they are showing default non-option values?
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