Revo tranny center-diff opinions?

[lincpimp]

Originally Posted by sjcrss

does anyone know if the traxxas CD will fit into the erevo tranny?.....

The erevo uses a 33t lower gear, while the revo uses a 29t. Plus I could not find a nylon 33t gear that could be modded to work, that is what cowboy did to make his conversion for the revo, 29t nylon gears are more popular...

I am working on the diff, but have heard that traxxas may make one for the erevo/emaxx. I am sure it would be a 2 spider design like the revo one, which is not optimal IMO... So my idea may still be desired, especially for brushless which seems to require heavier fluid and more "limited slip" effect than nitro.

[sjcrss]

well, linc...it looks like traxxas beat you to it, however, I'll more than likely purchase from you.....hopefully you can keep the price comparable to the traxxas one......has any one thought of buying the new traxxas gear and putting there own cup onto it?

[lincpimp]

Originally Posted by sjcrss

well, linc...it looks like traxxas beat you to it, however, I'll more than likely purchase from you.....hopefully you can keep the price comparable to the traxxas one......has any one thought of buying the new traxxas gear and putting there own cup onto it?

I seriously doubt I will be able to sell the whole deal for 40 bucks. Maybe the adapter, modded gear and the shafts... Even then it may require some shims depending on which diff cup is used. I would like to offer the whole deal as a kit that includes everything. Diff cups are about $6, internals $7-12, not sure what the modded output shafts will cost, and shims, plus modding the stock lower gear, and hardware...

Might be too pricey, probably close to 60-70 bucks... or more depending on what the machinist charges...

[sjcrss]

here is a question for you...since traxxas came out with there's and hopefully you can buy just the gear, like you can with the nitro revo, couldn't you just use the gear and put your own cup/internals...ect. on it and help reduce the machine time on the gear, and the cost as well...the question would be, is which cup is a direct replacement and that can hold the 4 spyders that we want...

here is a pic of the traxxas on w/ gear...


here is another question, ae all diff cups bolt pattern the same......does anyone have any info on this....

[sjcrss]

linc, just to let you know....im not trying to deter your sales possibly ect.....just tossing ideas out there to try to help figure out the best & most cost effective way to make one strong enough for us...

[neweuser]

I can tell you that the cup above is a stock emaxx or revo diff cup. I would think a 6 spyder type internal would work fine, it's the cup I would have issues with. What anout a maximizer cup? Don't maximizer's work with emaxx old style diff's? So the question here would then be, how can you get the proper internal's?

[George16]

Linc, nova-rc makes aluminum cups for the ofna gears.

http://search.ebay.com/search/search...ial&category0=

You can install the 6 spider gears inside.

[lincpimp]

Originally Posted by sjcrss

here is a question for you...since traxxas came out with there's and hopefully you can buy just the gear, like you can with the nitro revo, couldn't you just use the gear and put your own cup/internals...ect. on it and help reduce the machine time on the gear, and the cost as well...the question would be, is which cup is a direct replacement and that can hold the 4 spyders that we want...

here is a pic of the traxxas on w/ gear...


here is another question, ae all diff cups bolt pattern the same......does anyone have any info on this....

If traxxas will sell the gear seperately we may have a winner. I would just mod the adapter that I am having made to bolt to this gear. Hopefully they sell it seperately, as they do with the revo center diff:

http://www3.towerhobbies.com/cgi-bin...?&I=LXMHV6&P=7

Originally Posted by sjcrss

linc, just to let you know....im not trying to deter your sales possibly ect.....just tossing ideas out there to try to help figure out the best & most cost effective way to make one strong enough for us...

No problem, the more ideas I here the better the finished product will be! I am glad you posted a pic of the erevo center diff, now I can see what it looks like. Where did you find the pic?

Originally Posted by neweuser

I can tell you that the cup above is a stock emaxx or revo diff cup. I would think a 6 spyder type internal would work fine, it's the cup I would have issues with. What anout a maximizer cup? Don't maximizer's work with emaxx old style diff's? So the question here would then be, how can you get the proper internal's?

The maximizer cup uses std traxxas internals, so 2 spiders and 2 output gears. I will see if I can get my hands on a center diff kit, and try to use the gear on my adapter. I have a revo center diff, wrong number of teeth, 29 vs 33, but it should be the same size...

Originally Posted by George16

Linc, nova-rc makes aluminum cups for the ofna gears.

http://search.ebay.com/search/search...ial&category0=

You can install the 6 spider gears inside.

By 6 spider, you mean 4 spider gears and 2 output gears? A six spider diff is like the ofna spyder diff, and the ue diffs. A 4 spider gear diff is like a std 1/8 buggy/truggy diff.

[George16]

By 6 spider, you mean 4 spider gears and 2 output gears? A six spider diff is like the ofna spyder diff, and the ue diffs. A 4 spider gear diff is like a std 1/8 buggy/truggy diff.

Yup. 6 spider gear = 2 bevel/sun gear and 4 side gears.

Ofna ravager 6 spider diff:




Ofna Hyper 7/UE 6 spider diff:




Ofna Hyper 7/UE 8 spider diff:




What UE sells as 6 and 8 spider diffs are nothing but Ofna Hyper 7 6 and 8 spider diffs. UE just added the diff outputs, shims, and Ultralite cases in the kits they sell for $$$$.

[neweuser]

Originally Posted by George16

Linc, nova-rc makes aluminum cups for the ofna gears.

http://search.ebay.com/search/search...ial&category0=

You can install the 6 spider gears inside.

Yeah, but is the cup the same diameter as the maximizer? Looking for something that can hold a 6 internal, yet bolt up to that gear.

[lincpimp]

Originally Posted by neweuser

Yeah, but is the cup the same diameter as the maximizer? Looking for something that can hold a 6 internal, yet bolt up to that gear.

I doubt that you will find that. Looks like traxxas uses the gear on the center diff as the cover.

When cowbody made the setup for the nitro revo he used a different gear, as he had it machined to mount to an adapter that acted as the diff cover.

My main issue with the traxxas design is that it uses the output shafts to hold the assembly up via the stock bearings. I plan to have the diff case and my adapter run on bearings, and the shafts will run inside the diff and the adapter, just like they do on an 1/8 scale diff. Should last longer and rotate true. Plus my design will have a 4 spider diff, not the 2 spider traxxas setup.

[neweuser]

This whole diff issue is making me wish I kept my maxx just for the simple fact it had the slipperential. I hate constant wheelie's and bad power distribution. I still think FLM and Mike should take the FLM tranny case, reform the lower half to hold a 1/8 diff, and then incorporate the slipperential gears to also fit. Somewhat like a slipperential, but with the tranny so you can still use the motor mount.

[lincpimp]

Originally Posted by neweuser

This whole diff issue is making me wish I kept my maxx just for the simple fact it had the slipperential. I hate constant wheelie's and bad power distribution. I still think FLM and Mike should take the FLM tranny case, reform the lower half to hold a 1/8 diff, and then incorporate the slipperential gears to also fit. Somewhat like a slipperential, but with the tranny so you can still use the motor mount.

If they would design a new case that was similar to the new emaxx/erevo case, make it so that it uses the same input shaft and idler, but has the lower area remade to accept a diff. It would have larger bearing areas to accomodate 8/x16 bearings, and would have custom made output shafts. They would have to either make a 33t gear, or mod the existing gear like I will. The only real difference would be the larger bearings. I am stuck using 8x12 bearings as the stock tranny case has 6x12mm bearings stock.

I plan to use ceramic bearings, best that I can find.

[neweuser]

Originally Posted by lincpimp

If they would design a new case that was similar to the new emaxx/erevo case, make it so that it uses the same input shaft and idler, but has the lower area remade to accept a diff. It would have larger bearing areas to accomodate 8/x16 bearings, and would have custom made output shafts. They would have to either make a 33t gear, or mod the existing gear like I will. The only real difference would be the larger bearings. I am stuck using 8x12 bearings as the stock tranny case has 6x12mm bearings stock.

I plan to use ceramic bearings, best that I can find.

Exactly my idea. I sent the idea to Mike yesterday, no response as of yet. I hope he thinks about it.

[lincpimp]

Originally Posted by neweuser

Exactly my idea. I sent the idea to Mike yesterday, no response as of yet. I hope he thinks about it.

We will see. I will continue my quest to get a decent diff in the stock tranny case...