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Old 05-02-2011, 09:38 AM   #7486
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Nov 2010 high bite carpet. This is similar to the latest setup i posted. from the Cs.
http://racerlog.com/wiki/T.O.P._Photon#Setups

Xray 150cst/15wt in a Yokoko gear diff.
150cst? Is this because the Yokomo gear diff has a larger volume that you don't need 1000+cst?
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Old 05-02-2011, 10:27 AM   #7487
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150cst? Is this because the Yokomo gear diff has a larger volume that you don't need 1000+cst?
The spec-r and yokomo diffs are very similar in feel. Last year I ran 350cst within the spec-r outdoors and 2k indoors (but it never felt on carpet).

The lighter the oil, the more steering but there is less stability ..
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Old 05-02-2011, 11:58 AM   #7488
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The spec-r and yokomo diffs are very similar in feel. Last year I ran 350cst within the spec-r outdoors and 2k indoors (but it never felt on carpet).

The lighter the oil, the more steering but there is less stability ..
Did it leak when u ran that light?
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Old 05-02-2011, 12:52 PM   #7489
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Did it leak when u ran that light?
I have two R-Spec gear diff ..non of them leak..1000 and 500000 wt...
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Old 05-02-2011, 02:05 PM   #7490
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Did it leak when u ran that light?
Yokomo diff - leaked a bit, but nothing like spec-r

Don't care if it leaks .. only needs to be the fast setup and reliable ...
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Old 05-02-2011, 05:40 PM   #7491
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Yokomo diff - leaked a bit, but nothing like spec-r

Don't care if it leaks .. only needs to be the fast setup and reliable ...
Hey Mike
question : what made you decided to use the gear diff?
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Old 05-02-2011, 06:12 PM   #7492
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Hey Mike
question : what made you decided to use the gear diff?
well we all started running them last outdoor season. at the time i was sponsored by Atomic/Spec-R and running XRays. They came out w/ a gear diff at the time so I said I'd give it a try -- it was free . running a gear diff is very similar to running a loose ball diff ... but if you do that in any class other than 17.5 blinky you'll need to rebuild your ball diff very often. when i started running a gear diff it took my 'pushy' XRay T3 and made it rotate, especially through 180s, where it would usually push. and when you jumped on the power the car would just hook-up.. no slipping, just lot of acceleration.

also -- i don't know if everyone remembers or not.. but the Worlds occurred last summer and the Spec-R gear diffs were "very" popular because of the win from Marc R.
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Old 05-02-2011, 07:11 PM   #7493
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well we all started running them last outdoor season. at the time i was sponsored by Atomic/Spec-R and running XRays. They came out w/ a gear diff at the time so I said I'd give it a try -- it was free . running a gear diff is very similar to running a loose ball diff ... but if you do that in any class other than 17.5 blinky you'll need to rebuild your ball diff very often. when i started running a gear diff it took my 'pushy' XRay T3 and made it rotate, especially through 180s, where it would usually push. and when you jumped on the power the car would just hook-up.. no slipping, just lot of acceleration.

also -- i don't know if everyone remembers or not.. but the Worlds occurred last summer and the Spec-R gear diffs were "very" popular because of the win from Marc R.
good report..thanks
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Old 05-03-2011, 10:25 AM   #7494
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I tried the yokomo gear diff with 700wt oil. The car feels great, still a little understeer though.

Next I changed my bodyshell to the Ride Legacy B4. That sort of gave me a "1/12 feel". It took some adaptation but now works great.

The only thing I noticed is my rear belt(the black one) wears really fast. I have worn a new rear belt in just about 15 packs of Mod. What is the tension level you guys set when using the gear diff? I find that if I set it loose like on normal gear diffs, after about 5 packs, the car gives off a strange sound upon hard acceleration, as if there is belt slipping. I then tightened the belt a notch and my belt's wear rate became unreasonably high.
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Old 05-03-2011, 11:22 AM   #7495
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I tried the yokomo gear diff with 700wt oil. The car feels great, still a little understeer though.

Next I changed my bodyshell to the Ride Legacy B4. That sort of gave me a "1/12 feel". It took some adaptation but now works great.

The only thing I noticed is my rear belt(the black one) wears really fast. I have worn a new rear belt in just about 15 packs of Mod. What is the tension level you guys set when using the gear diff? I find that if I set it loose like on normal gear diffs, after about 5 packs, the car gives off a strange sound upon hard acceleration, as if there is belt slipping. I then tightened the belt a notch and my belt's wear rate became unreasonably high.
how much play is there in your layshaft and diff setup? the geardiff require some extra shims to take out the side to side play, Maybe the belt is pulling at an angle under power?
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Old 05-03-2011, 11:23 AM   #7496
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I tried the yokomo gear diff with 700wt oil. The car feels great, still a little understeer though.

Next I changed my bodyshell to the Ride Legacy B4. That sort of gave me a "1/12 feel". It took some adaptation but nowp works great.

The only thing I noticed is my rear belt(the black one) wears really fast. I have worn a new rear belt in just about 15 packs of Mod. What is the tension level you guys set when using the gear diff? I find that if I set it loose like on normal gear diffs, after about 5 packs, the car gives off a strange sound upon hard acceleration, as if there is belt slipping. I then tightened the belt a notch and my belt's wear rate became unreasonably high.
You shim the yokomo gear diff?
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Old 05-03-2011, 09:13 PM   #7497
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Ya. I placed shims equally on both sides of the gear diff
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Old 05-03-2011, 10:00 PM   #7498
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What is the part number for the 46MM steel dog bones??
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Old 05-03-2011, 10:35 PM   #7499
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What is the part number for the 46MM steel dog bones??
PO-SDT008
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Old 05-04-2011, 03:51 AM   #7500
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Ya. I placed shims equally on both sides of the gear diff
You might not want to shim it equally. Make sure the pulley edge isn't hitting your chassis.

I haven't seen belt wear like your talking about. I'd say u should just continue to tighten the belt as it should be allowed to slip (that is What that noise is)
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