Installed Revo V3 Diffs - have a few questions and comments.

[BP-Revo]

So this weekend I spent some time dropping in the V3 diffs (and a new pair of rear sliders) into my G2R.

They went in quite smoothly. I didn't need to part the bulks just slipped the stock ones out and the new V3's in just like they bulks were designed to let you do.

The few extra things I had to do were trim the little tab which secures the diff on the front (its the thing that clips onto the chassis plate and the front body mount screws into). Also, I had to dremel/file a bit of the rear plate that goes over the diff. There are two cutouts in the plate which allow the stock diff to stick out a bit (because the housing is larger where the ring gear sits). On the V3 diffs, this flare for the ring gear is slightly smaller in diameter, but is quite a bit wider, and required me to remove about 3mm of material and then chamfer the insides for it to sit properly. Didn't take long (I spent about 30 minutes doing it because I kept checking to see if i needed to remove more material because I wanted to remove as little as possible as to not risk sacraficing strength). Most of it was because I kept having to run back and forth between the sink as I was dremeling under running water to kee the carbon fiber fumes to a minimum.

But other than those two mods, they dropped in fine.

I wanted to note that while assembling the diffs, there were quite a few tight spots. But after talking to Mike after helping him at the RCX booth with MetalMan, he assured me that having some tightness in the diff is normal and he builds all his diffs this way. He said after a run or two the diffs will go ahead and loosen up like any other diff.

So I threw in my FlightPower Evo30's in 5S configuration and headed out for a quick spin (only about 7 minutes, I didn't hit the LVC). At first the truck had a lot of drag brake due to the tightness of the diffs. So I just drove around slowly for a little bit and began working my speed up to wear in the diffs. After 3-4 minutes they loosened up a little but not too much. They were still tight but had no notches in them like before.

So I went and ran it a little more and when it came in it was looser than before but nothing like the stock diffs before. So I picked up the truck and revved it for about 30 seconds in the air at 40%-90% throttle, varying the speed. After this the diffs felt considerably looser and the truck now rolled freely with no notches and only a mild tightness.

Here is what I noticed:

The batteries were luke warm.
ESC fan turned on for like 10 seconds (MMM).
Motor wasn't hot to the touch but was decently warm. I'm guessing 100-110* or so.

I felt my rear diff case (since the top part is slightly exposed through the aforementioned gap on that plate). That gap is right between the rear rockers. Anyway, the diff was hot to the touch. A good 120*+

I was wondering if this was normal? I figure it was due to the diffs wearing in, but wanted to get everyones opinion.

Also, the gear ratio's of the new V3's are slightly higher than the stock Revo diffs. Before, I had perfect gearing running 4S. Now I am going to be switching back and forth from 5S to 6S. I was figuring I should leave the pinion be and I should be ok.

What do you guys think? Should I drop a tooth on the pinion to be safe?

Any other comments welcome.

[TexasSP]

The drive train is always going to heat up. Especially in the gear area where there is more friction. Are you running diff oil or just grease?

[doo540]

My v3's have about 3 hours run time on them and they are doing great. 6s neu 1515 2.5d. I broke one of the diff output shafts coming off a jump and landing with the power on. Best upgrade for a e-revo diff you can buy.

[nitrostarter]

Originally Posted by BP-Revo

Also, the gear ratio's of the new V3's are slightly higher than the stock Revo diffs. Before, I had perfect gearing running 4S. Now I am going to be switching back and forth from 5S to 6S. I was figuring I should leave the pinion be and I should be ok.

What do you guys think? Should I drop a tooth on the pinion to be safe?

Any other comments welcome.

What is your current gearing? Try running the numbers on the speed calc and them switch the diff ratio to :Typical Buggy" ratio and then regear accordingly to achieve the same speeds.

[BP-Revo]

My drivetrains rarely get much above room temp on all my trucks. This one included before the off change.

I'm using silicon in the differentials and grease for the ring and pinion.