Official Erevo 1/8 scale center diff thread

[isuck@rc]

Simply have no dress press champ- i use a fold out bbq table for a wrokbench with a plastic chair atm lol.

[Urgeoner]

Originally Posted by simplechamp

If you saw the tools I used to build mine you would fall over laughing. 1970's era bench grinder and 1950's era drill press. The key thing is getting the right drill bits, carbide. I'd like to say the spot annealing helped, but I have no baseline to compare it to.

Wasn't someone playing around with using a Kyosho plastic spur instead of the hardened steel spurs? How did that turn out?

lol I have a 60's era Craftsman drill press

[ZippyBasher]

Well to keep this thread up and alive... I just bought the items needed from AMAIN and I will try my hand at making one of these.

With threads rolling through about everyone trying to make a maxx cd, I thought this route was better as I can retain the Slipper assembly. With Mikes Maxx CD mount that is supposedly coming soon I would need to spend extra on a slipperential and I am short on $$.
I am going to be installing this into a 3905 maxx; (same tranny an Erevo) I dont think this will work with a 3906.

Anyhow I will keep this updated for anyone... And thanks everyone for putting all this together...

[shaunjohnson]

well mine is still going strong!! thanks for showing us how mr crash
really simple design.
but now i have this losi smart diff here in my room...but i'm currently happy with the XXL diff i have got in there...what do i do?
run the smartdiff anyway?

[sjcrss]

I'm just wondering which version of the CD you are going with......

[mistercrash]

Originally Posted by shaunjohnson

well mine is still going strong!! thanks for showing us how mr crash
really simple design.
but now i have this losi smart diff here in my room...but i'm currently happy with the XXL diff i have got in there...what do i do?
run the smartdiff anyway?

It would be nice to know if it can be done with the smart diff innards. If you try it, keep us informed of how it works. From what I know (and I don't know much) the smart diff uses the same diff case with the metal inserts and the same ring gear. I just don't know if the extra parts that go inside the smart diff would catch on the two screw heads for the posts that secure the output gear. If done well, the screw heads are well below the inside surface of the ring gear but I just don't know if that's enough for the smart diff mechanism to not catch or rub on them.

[Semi Pro]

Originally Posted by mistercrash

It would be nice to know if it can be done with the smart diff innards. If you try it, keep us informed of how it works. From what I know (and I don't know much) the smart diff uses the same diff case with the metal inserts and the same ring gear. I just don't know if the extra parts that go inside the smart diff would catch on the two screw heads for the posts that secure the output gear. If done well, the screw heads are well below the inside surface of the ring gear but I just don't know if that's enough for the smart diff mechanism to not catch or rub on them.

it can, i converted mine as soon as i got it back from you

you have to use the losi heavy duty diff cup, it all drops right in

[sjcrss]

Interesting, I thought about doing this myself, but I figured if it wasn't broke don't fix it. Also, how does it perform in the erevo tranny?

[mistercrash]

Originally Posted by Semi Pro

it can, i converted mine as soon as i got it back from you

you have to use the losi heavy duty diff cup, it all drops right in

So we have one confirmation that the Losi Smart diff can be used for a CD on the E-Revo. That's cool. Now we need an update on the performance like sjcrss said. Get to work Semi

[sjcrss]

i agree, the price of doing it , kinda kept me from trying it, I wanted to, but the funds needed to be used elsewhere....if it works out great, I may just do one myself....keep us posted.

[Semi Pro]

Originally Posted by mistercrash

So we have one confirmation that the Losi Smart diff can be used for a CD on the E-Revo. That's cool. Now we need an update on the performance like sjcrss said. Get to work Semi

i love torsion diffs, i run them in everything


i would love to tell you all it rocks and you all can't live without it but i live in MN, there is afew feet of snow on the ground and it is below 0 outside even in the daytime (really its been nice this week, mid 20's) so i dont think i will have my revo out for afew months.

its been winter along time, i think i rember seeing the sun in june or was it july?

[ZippyBasher]

Ok so I received all my Parts to complete this diff.

I am going to use a Losi Heavy Duty Case, LST bevel Gears and an 8ight B-1.0 Spur I had laying around.

So my main question is when putting the holes in the Traxxas Output shafts Is the Correct measurement .190" from end of shaft to center of the hole being drilled?

Just a bit confused from Mistercrash saying .190" on an OFNA diff output. Yet I am using a LOSI diff. I want to be certain that this is correct for the LOSI diff as well.

THANK YOU GUYS!

[mistercrash]

It's funny because the first time I took that measurement, it was because someone was asking about it. The only concern I had making that hole was for it to be well centered in the shaft. For the rest, I just went by eye and tried to match the location of the hole in the Losi output cups 0.190'' is fine and don't worry too much about it, worry more on making your holes centered on the shaft so that once the pin is in the hole, the shaft slides in the gear without too much force.

After looking at the losi diffs, I noticed that if the post holes were countersunk deep enough, the smart diff parts would drop right in. I was planning to do it as soon as I got mine back, Crash, but after doing some reading on people using them in e-buggies and truggies, the fact that there is no clutch on e-motors means that the center might act a bit odd (it's meant to have a freewheeling drivetrain in the rest position) I'd be curious to hear how it goes though. I think I'm going to run a SD in the front of my revo but leave the center as a regular diff.

Semi, I'd definitely love to hear some results when you get a chance to test it. I know in nitro truggy, the SD center and front is all the rage, but the reviews become a bit more mixed e-truggies.

[Semi Pro]

Originally Posted by AMorgan

After looking at the losi diffs, I noticed that if the post holes were countersunk deep enough, the smart diff parts would drop right in. I was planning to do it as soon as I got mine back, Crash, but after doing some reading on people using them in e-buggies and truggies, the fact that there is no clutch on e-motors means that the center might act a bit odd (it's meant to have a freewheeling drivetrain in the rest position) I'd be curious to hear how it goes though. I think I'm going to run a SD in the front of my revo but leave the center as a regular diff.

Semi, I'd definitely love to hear some results when you get a chance to test it. I know in nitro truggy, the SD center and front is all the rage, but the reviews become a bit more mixed e-truggies.

the diffs dont and can't freewheel, the spider grears are ALLWAYS makeing conection, allot of people talk about torsion diffs that dont know what they are doing because the have never used one or havent used them enuff.

the easy way to look at a torsion diffs is it's a diff that just act like a variable fluid weight diff from about 1k up to 30k or so when controling wheel spin

here is a link that may help you AMorgan
http://www.rc-monster.com/forum/showthread.php?t=25229