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Old 10-02-2016, 04:54 PM   #11416
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why does everyone run such thick oil in the center diff? i came from a d413 and yes i know its a different buggy but ran 60k in the center, 100k on higher grip, so whats the reason for 200k plus, you would think at those thicknesses you basically have a spoool
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Old 10-03-2016, 06:31 AM   #11417
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why does everyone run such thick oil in the center diff? i came from a d413 and yes i know its a different buggy but ran 60k in the center, 100k on higher grip, so whats the reason for 200k plus, you would think at those thicknesses you basically have a spoool
the car likes to be balanced as far as power delivery. it's just how it is. and plus the way the drive chain is so free, the thicker center diff fluid adds a bit of resistance giving a bit more traction.

also i think you will see thicker oils in other cars once people catch on a bit.
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Old 10-03-2016, 07:29 AM   #11418
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All cars use different designs for the diffs. Tooth count, clearances and volume all change what oil is required. It's just like shock pistons. The Xray takes heavier oils.
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Old 10-03-2016, 08:51 AM   #11419
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All cars use different designs for the diffs. Tooth count, clearances and volume all change what oil is required. It's just like shock pistons. The Xray takes heavier oils.
exactly, the car tends to be on the heavy side, depending how you set it up. so that inertia calls for thicker oils. I run like 400-600cst rear and 600-800cst front shock oil depending on the surface. that comes out to like 50wt-70wt, usually most cars run more like 30-50wt.
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Old 10-03-2016, 01:49 PM   #11420
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exactly, the car tends to be on the heavy side, depending how you set it up. so that inertia calls for thicker oils. I run like 400-600cst rear and 600-800cst front shock oil depending on the surface. that comes out to like 50wt-70wt, usually most cars run more like 30-50wt.
This is my 1st 4wd buggy and I see what you are saying. I race with guys running TLR, HB, AE and Yoko. Most of them are on the light side for shock oils whereas I have 800cst(60wt) up front and 613cst(47.5wt) in the rear using AE oils. I set mine up off the basic carpet setup sheet the Xray has for the '15 spec. At this point that setup is working for me but Im sure with more wheel time I will be changing it.
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Old 10-03-2016, 03:13 PM   #11421
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Lighter oils with yatabe springs on carpet are $$$
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Old 10-04-2016, 04:00 AM   #11422
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On low to medium grip clay what is better big spacers on top or bottom of caster blocks?
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Old 10-04-2016, 05:09 AM   #11423
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Originally Posted by savageboy69 View Post
why does everyone run such thick oil in the center diff? i came from a d413 and yes i know its a different buggy but ran 60k in the center, 100k on higher grip, so whats the reason for 200k plus, you would think at those thicknesses you basically have a spoool
Not even close. With 500k I'm diffing out and ballooning the front tires on the straight. Also the car has a ton of turn in.

If anything, once warmed up, the diff seems a bit soft.
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Old 10-05-2016, 07:38 AM   #11424
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Default 13.5 Gearing

I am running 13.5t hobbywing with stock 81t spur/26 pinion temps are good and just want to know what some of you are running for gearing as I would like to gear up.
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Old 10-05-2016, 08:26 AM   #11425
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Ran 78/27 last time out but motor was still extremely cool, around 105 degrees after 7 minute race. Will be bumping up to a 28 next time out and see how it goes.

I do have a fan on the motor and using a trinity d4 1s 13.5.
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Old 10-05-2016, 11:13 AM   #11426
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i am running a Tekin Gen3 13.5, with RSX speedo, WTF windy fan, running 78/26 temps are good..
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Old 10-06-2016, 09:38 AM   #11427
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It really depends on your driving style too as far as center diff . If your reall aggressive you shoukd go with the 1 mil . The softer the fluid the easier to drive . You just gonna lack forward bite . Its just like a slipper thicker oils is a tighter slipper thinner is looser .
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Old 10-06-2016, 01:45 PM   #11428
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It really depends on your driving style too as far as center diff . If your reall aggressive you shoukd go with the 1 mil . The softer the fluid the easier to drive . You just gonna lack forward bite . Its just like a slipper thicker oils is a tighter slipper thinner is looser .
110% true. Ive been saying this since the 15spec. I can run 1mil all day and maybe get a faster hot lap but with 500k ill run a much faster 5 or 7min run because the car is just more consistent and easier to drive. normally Ill run 7k,500k,5k or 7k,300k,5k at AMS and other tracks nearby.
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Old 10-06-2016, 01:58 PM   #11429
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Ran 500K on outdoor blue groove with dusty edges outside the groove. It was perfect. Ran it on Med/high bite clay with electrons... much prefer the slipper in that case. Have not tried 1mm
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Old 10-06-2016, 02:05 PM   #11430
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110% true. Ive been saying this since the 15spec. I can run 1mil all day and maybe get a faster hot lap but with 500k ill run a much faster 5 or 7min run because the car is just more consistent and easier to drive. normally Ill run 7k,500k,5k or 7k,300k,5k at AMS and other tracks nearby.
that's not true though because no matter the oil you use the outdrives move independently. the slipper outdrives don't move independently no matter how loose you set it at. it only slips under high load in which it delivers slightly smoother power, but still equal power to both front and rear.

no comparing a center diff to a slipper no matter the oil.

also 500k-1mil works perfect on anything med-high bite, typically clay surfaces. carpet i much prefer the slipper. but on any dirt surface i much prefer the center diff .
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