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XRAY - Model racing cars :: View topic - T4 2013 - front differential Oil choice?
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T4 2013 - front differential Oil choice?
https://setup.teamxray.com/xsetup/legacy/viewtopic.php?f=8&t=18620		 Page 1 of 1
Author:  sonic2 [ Mon Apr 07, 2014 15:39:35 ]
Post subject:  T4 2013 - front differential Oil choice?
I want to know what the effect of having a too heavy or thin oil is in the front differential.

Does too heavy generate understeer and too thin generate oversteer?

I race on high grip carpet, on foam tyres.

I don't think the hudy setup guide covers the effects of this setting.

It feels like the car is pushing on exit because I am using too heavy front oil, does this sound correct?

I use 50k front, 3k rear.

2.9 front spring, 2.3 rear.

front kit roll bar, none on rear.

ride height about 4.5mm all round.

Thank you :D
Author:  sonic2 [ Tue Apr 08, 2014 18:07:57 ]
Post subject:  Re: T4 2013 - front differential Oil choice?
Generally speaking, whatever the situation, If I need more steering, do I use a lighter front diff oil?
Author:  Skiddins [ Tue Apr 08, 2014 22:06:26 ]
Post subject:  Re: T4 2013 - front differential Oil choice?
50k sounds very thin to me, even for foams.

Have you tried 500k or 1million?
Author:  sonic2 [ Wed Apr 09, 2014 10:39:24 ]
Post subject:  Re: T4 2013 - front differential Oil choice?
I've tried Hudy 1mil, didn't like it (far far far too twitchy) and when I feel my diff against others it still feels a little stiff. So I'm on 50k now.

Does anyone have a tip for removing old oil (the 1mil was very sticky and I couldn't quite get it all out). I used a toothpick for what feels like an eternity on all of the teeth of the gears! :D

It was suggested I try 50k, but am thinking of reducing it to 40k.

I am wondering if the cross contamination has made an odd handling trait :?:
Author:  sonic2 [ Thu Apr 10, 2014 10:14:40 ]
Post subject:  Re: T4 2013 - front differential Oil choice?
I was thinking of using a stiff toothbrush and cleaning the inside of the diff out and the gears with this, but what can I use to get the old diff grease off easier as its really thick?

I don't want to use a chemical that weakens the gears and casing if that makes sense, what do the team guys do in this scenario?

Many thanks :)
Author:  Skiddins [ Thu Apr 10, 2014 10:25:30 ]
Post subject:  Re: T4 2013 - front differential Oil choice?
I recall others talking about warming the thicker oil to make it easier to get in, maybe the same will work for removal?

If it's going to be a nightmare I would consider selling the diff to someone who can use it and buying a new one, or cleaning it as best you can and buying new internal gears.
Author:  sonic2 [ Thu Apr 10, 2014 12:39:35 ]
Post subject:  Re: T4 2013 - front differential Oil choice?
Thanks for the reply.

I would rather not as they are about £40 a pop (if I replace the whole diff) but yes I do see where you are coming from.

Replacing only the gears, maybe :)
Author:  Tak [ Thu Apr 10, 2014 13:55:43 ]
Post subject:  Re: T4 2013 - front differential Oil choice?
For removing such a thick silicone oil, just drop some vely light silicone oil trying to desolve it (eg 500 or 1000).
Author:  sonic2 [ Fri Apr 11, 2014 10:25:59 ]
Post subject:  Re: T4 2013 - front differential Oil choice?
I may try your suggestion Tak, but I do not think it will work.

The 1,000,000 is very thick, sadly I do not think the two will mix and come out :(
Author:  sonic2 [ Tue Jun 03, 2014 10:24:46 ]
Post subject:  Re: T4 2013 - front differential Oil choice?
Here is my solution for anyone who is changing from very thick oil to much thinner.

I took the diff apart as usual.

I removed the clear o ring as they are not needed anyway.

I then took every piece out from the differential, put a tiny bit of 30wt shock oil in the differential casing, mixed it up a little, waited a for an hour, then tipped it upside down onto a thick layer of kitchen towel, then used several cotton buds in the diff casing to remove the remains of the thick oil mixed with shock oil. (1 mil I think it was).

I then used tooth picks on the gear casing and every gear tooth to remove the rest.

It was rather time consuming, (about 2 hours in all!) but saved buying a new differential @ £40 :D

Thank you for the suggestion Tak, I did not think it would, but it made the process easier. 8)
I then refilled with my chosen oil (40,000cst) and replaced both the paper gasket and the large thin black gasket.
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