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Old 08-25-2010, 06:39 AM   #496
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Originally Posted by ark View Post
would be good if the gear diff had an adjustable slipper to it
Or as it's better known, a ball diff...

The whole point of a gear diff is to provide 100% drive (if wheels both have good grip) yet allow the wheels to turn independently.

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Old 08-25-2010, 08:30 AM   #497
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Guys, I build and tested the 3Racing gear diff today. Package wise 3Racing is better, it includes everything you need for operation (37t and 38t pulleys, bigger internal shims for the outdrives, metal cross shafts, 3.5mm drive shafts blades, Silicone Oil: I don't know the viscosity coz there is no label or info on the bottle, RUBBER GASKET which is good compare to the paper one from Spec R, 2x diff bearings and some various thickness bearing spacers to make the diff fit to some car models)

During building I felt that the casing around the outdrives are a bit tight, so I put some grease on the out drive shafts and this helps smooths it out a bit. After a few runs testing it today the diff is smooth like butter. And the best part for me over the Spec R is there is NO LEAK at all. Overall I m very happy.
What car did you used the 3 Racing diff? Sorry if I missed it.
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Old 08-25-2010, 12:02 PM   #498
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would be good if the gear diff had an adjustable slipper to it
Slippers are not legal for TC, but wow these cars would fly with one!
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Old 08-25-2010, 03:20 PM   #499
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What car did you used the 3 Racing diff? Sorry if I missed it.
I tested it on my Sakura Zero, I had a TRF416x and looking at it, it definitely fits the TRF. Not so sure about T3 though.
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Old 08-26-2010, 01:14 AM   #500
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Default 3Racing gear diff in a T3

The 3Racing diff for the Sakura does NOT fit the Xray T3 directly. The inside diameter of the outdrives are too small for the Xray axles, both the spring steel and aluminum ones. I had to use a grinding bit and dremel out the cups so that the axles would slide in and out. Also the 50mm axles are required, which may have already been said. With the stock track width there was binding in the rear suspension using the 52mm aluminum axles but almost none in the front using the 52mm spring steel axles. I could probably add 1mm shims on the suspension holders to slightly increase the track width which would fix the binding, but the would put my track width at 191mm. Also the included 3Racing 38t pulley is larger in diameter than an Xray 38t pulley. You have you use the upper diff mount setting or it will rub the chassis. Even with the included shims there is still a small amount of play side to side, but just a mm or two.
Having said all that, the quality of the parts are nice. Everything fit together easily with tight tolerances. No sanding trying to get something to fit. No leaking and I used a light weight diff fluid for the rear diff. They were smooth from the start and were like butter after a minute or two of running the car on the bench.

Quote:
Originally Posted by dameetz View Post
I tested it on my Sakura Zero, I had a TRF416x and looking at it, it definitely fits the TRF. Not so sure about T3 though.
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Old 08-29-2010, 01:47 PM   #501
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Have now one try to race on carpet?

Same settings on the diff 1000 diff. Oil like out doors?
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Old 08-29-2010, 02:01 PM   #502
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Gear diff Gives Too much Rotation Compare to Ball diff ,I know using Thicker diff oil helps to reduce it Is there any other Setup Change help to slow down that rotation rear Toe-in Should helps but more or less Toe-in and What else?
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Old 08-30-2010, 11:04 AM   #503
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Have now one try to race on carpet?

Same settings on the diff 1000 diff. Oil like out doors?
It seems that the higher the grip level the thicker the oil required.
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Old 08-30-2010, 11:50 AM   #504
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1000cst on high grip carpet is not great at all 2000cst or 3000cst works better.

On asphault it seems that anything thicker than 2000cst isnt great. 2000cst at Halifax.

Havn't tested at West London yet, going this weekend, but i'm thinking 1000cst is going to be better.
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Old 08-30-2010, 02:57 PM   #505
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Very true 3000cst is almost perfect on high grip carpet...
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Old 08-30-2010, 06:42 PM   #506
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Havn't tested at West London yet, going this weekend, but i'm thinking 1000cst is going to be better.
It was was for me at the Ansmann, tried 3000cSt, a ball diff then 1000cSt.

The ball diff was good, but lacked drive out of the corners so I went to the gear diff with 1000cSt and the car felt very stable.

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Old 08-31-2010, 02:36 AM   #507
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I tried 1000, 1200 and 1500 on the weekend and found that it felt best for me when i topped up the leaking 1200 with some 1500 but we had higher than normal grip so i think 1500 will be the hot ticket.
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Old 08-31-2010, 03:31 AM   #508
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Well today i will try my ball diff again

I bought 1,000 , 1,500 , 2,000 and 3,000 oils to try

I have been told that 3,000 is best for our track (rom a nitro driver) but i am yet to find out what works for electro
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Old 08-31-2010, 04:14 AM   #509
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just finish building the 3racing gear diff with 1000cst oil felt tight after assembly but after running it in on the bench like a ball diff it felt very smooth almost like a xray ball diff...will test it on track against spec-r see which feels better
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Old 08-31-2010, 09:01 AM   #510
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I tried the 3Racing gear diff filled with 800cst oil with more than 8 packs of runtime and I must say, it felt great.... however due to a screw loose on the bulk head and this has led to a misaligned diff, the gear was stripped.

Even as such, the gear case is still ok unlike SpecR, the gear case, shims and maybe the plastic cross would definitely need replacement. Now I just need to replace the plastic gear and it's definitely stronger then a SpecR gear...

Luckily, I have another set to try, this one is filled with 2k oil and the feels is about the same, of coz the traction has improved alot by then.

If u ask me, get the 3Racing gear diff for your car... It will be an awesome weapon!
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