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Old 03-23-2016, 02:16 PM   #1
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Default gear diffs and old school dirt tracks for 2wd vehicles

I know that the ball diff from what people are saying is ideal, but my question is for those who run on old school dirt tracks with 2wd vehicles and use a gear diff, what oil weights are you using?

By old school dirt, I mean tracks where something like a proline caliber, joncepts goosebump, or even an old school step pin would be the hot tire.
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Old 03-23-2016, 03:37 PM   #2
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3000wt give or take. This was on loose to mid-grip with Short Course 2wd.
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Old 03-23-2016, 03:49 PM   #3
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The general rule with a ball diff was as loose as possible without slipping. Obviously a gear diff can't slip do basically as light of an oil as possible without diffing out anywhere or just incessantly spinning one wheel from a stop.
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Old 03-23-2016, 06:16 PM   #4
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Quote:
Originally Posted by Gigasipke View Post
3000wt give or take. This was on loose to mid-grip with Short Course 2wd.
got a link to a vid of the track to see conditions?
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Old 03-23-2016, 06:39 PM   #5
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Some are using 20k .The d216 apparently comes with 100k . The actual volume of oil the diff holds plays a role too .
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Old 03-23-2016, 06:43 PM   #6
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Quote:
Originally Posted by carpetburner View Post
Some are using 20k .The d216 apparently comes with 100k . The actual volume of oil the diff holds plays a role too .
D216 comes with 1000wt.
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Old 03-23-2016, 08:04 PM   #7
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Il say this ive seen the D816 last weekend on a clay/soil mix track and with the gear diff I'm assuming the guy was using 1000w oil.

And it was hooked up fine .
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Old 03-24-2016, 09:17 AM   #8
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good stuff thanks for the info. I am looking to pick up some more PT Racing oils and I am assuming that there isn't anything "special" about oils that are stated to be shock oils versus diff oils other than the cst value, so some if in some weird world I wanted to try say 700CSt ( I am just throwing that out there), then I can give that a go using the shock oil.
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Old 03-30-2016, 11:31 AM   #9
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anybody?
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Old 03-30-2016, 12:12 PM   #10
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The biggest issue with gear diffs to me is the consistency versus a well built and broke in ball diff.

A ball diff doesn't change unless you change it; it's only as good as it's operator. A gear diff over time will change and degrade.
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Old 03-30-2016, 12:33 PM   #11
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Quote:
Originally Posted by Cain View Post
good stuff thanks for the info. I am looking to pick up some more PT Racing oils and I am assuming that there isn't anything "special" about oils that are stated to be shock oils versus diff oils other than the cst value, so some if in some weird world I wanted to try say 700CSt ( I am just throwing that out there), then I can give that a go using the shock oil.
Shock and diff oils are oils, nothing less, nothing more, so you can try anything, however you should also try to remove 2 gears .

That's the next stage I'm going to test and compete on an old school outdoor track at the end of april, I use MR33 1000 cts in my D216 on low to medium grip outdoor carpet track, on dirt track I'm going to remove 2 gears.

Some drivers are doing so for instance on the DEX 210F.

Obviously I wish a ball diff was available but it's not , maybe in 1 month or 2 ...or 6, so I think removing gears is worth the penny.
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Old 03-30-2016, 12:36 PM   #12
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Quote:
Originally Posted by Socket View Post
The biggest issue with gear diffs to me is the consistency versus a well built and broke in ball diff.

A ball diff doesn't change unless you change it; it's only as good as it's operator. A gear diff over time will change and degrade.
Well, even with the best grease a ball diff need some maintenance around 2/3 hours of practice...
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Old 03-30-2016, 12:37 PM   #13
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cool thanks for the info. How long would you say should you wait between rebuilds on a gear diff? The dex210F is very quick for diff changes so no worries about length of time to take it out so curious.

Thanks for the info on the 2 gear removal. I read that before and will give that some consideration. What have you seen is the weight difference you go with for oil when running 2 gear versus 4 gear to get same feel? (example: 2 gear I went 5K, same feel on 4 gear was 3K, etc)
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Old 03-30-2016, 12:41 PM   #14
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I though about using two spider gears in a gear diff on a 2wd wouldn't you have to go up on the diff oil weight ? How do they hold up also ?

I run my indoors on med traction .
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Old 03-30-2016, 12:47 PM   #15
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I think for 17.5 they should be fine from what I recall someone else saying. I just forget what the "conversion" difference was between 2 gear versus 4 for similar feel. As I am going to try the dex210F on old school dirt, looking to see what options are out there.

Now, for stuff with a bit more pep, I heard that its benefical to go to steel gears which I have.
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