e-revo weakness diff - RC-Monster Forums

e-mike · **e-revo weakness diff -** 03.04.2009, 11:13 PM

so ive been running one of my e-revo for about a month and i blow up 4 rear diff and one front.....w.t.f

they are suposed to be stronger than before????my spur is not to thigh,,,

my set-up is

mmmv3,6 cell lipo 1515 1,5y geared for 35mph(18/65)and big joe tire...<(could it be my issue)

timing lowest,punch control 100%

and i also broke 12 shaft

its winter here...i was thinking that running in winter was better and smoother for the drivetrain,,,i was wrong

forget to say that ive never broke any diff in both(3)of my truck last summer....why i dont know

?

Metallover · 03.04.2009, 11:35 PM

Do you shim your diffs? It could also be that your diff housings (bulkheads I think) are worn out.

E-Revonut · 03.04.2009, 11:52 PM

Those big tires aren't helping! Been running my E-REVO since they came out, no diff problems so far. I've run 4, 5, and 6s on my 1515 2.5d. I have only run the talons and badlands which put much less strain on the drivetrain than Big Joes

JThiessen · 03.05.2009, 12:27 AM

The diff's in your Revo are no different than the original 2.5R Revo. Same Gears, same cases.

Running in the winter is actually a little harder on parts. The plastics get brittle, and they have a different coefficient of expansion than steel parts, so the way parts fit together at 20 degrees is different than at 80 degrees. Maybe enough to cause misalignment on rotating parts, maybe not.

Like E-Revonut said, those big joes can be deadly with the right amount of power.

squeeforever · 03.05.2009, 01:57 AM

Quote:

Originally Posted by JThiessen

The diff's in your Revo are no different than the original 2.5R Revo. Same Gears, same cases.

There actually different.

Semi Pro · 03.05.2009, 04:05 AM

Quote:

Originally Posted by squeeforever

There actually different.

how so?

i had a 2.5 and i now have a platinum and they are the same

try losening the slipper alittle more and dont gun it or brake hard after landing a jump and they should hold up alot better

aluminum cases and the inner brace will help but the only other fix is the massively over priced FLM conversion

JThiessen · 03.05.2009, 09:40 AM

Quote:

Originally Posted by squeeforever

There actually different.

I'll bite...how so? I've been buying the same parts since day one - haven't noticed anything different.

JThiessen · 03.05.2009, 09:57 AM

I think Squee was correct, or maybe more that I was somewhat incorrect. The original 2.5R had an "I-Bar" set up in it. I dont recall my first one having that - but...one doesnt always recall everything! The 3.3 diffs are configured the same as the E-Revo, just some parts have an X designation, which may or may not mean something

Aceldama · 03.05.2009, 10:57 AM

I just came in to bash Big Joe tires. I got a set for my MGT running a LRP .28 and the performance using the Big Joe vs the stock tires (which are taller) is VERY noticeable. Ditch the Joes, they are way too heavy.

BrianG · 03.05.2009, 11:21 AM

What part of the diff is breaking?

If it's the ring/pinion; proper shimming should help. And make sure the diff cases aren't deformed.

If it's the inside of the diffs, a metal cup should help. They only use two spider gears, so that will tend to flex the stock diff cup more under heavy acceleration.

madmaxx · 03.05.2009, 11:35 AM

the e-diff's are different from the nitro diff's, the e-diff's use a spider gear support bar

proper shimming of the diff is necessary for both e-powered/nitro IMO

i run shimmed, alu diff's with Robinson R&P

JThiessen · 03.05.2009, 12:08 PM

It appears you are correct - I had my pages mixed up, hence why I didn't recall seeing that support in there.

Looking at the exploded view, it appears that there is only one spider gear - is that correct?

mistercrash · 12:48 PM

The diffs of the nitro Revo and the ERevo are different. The nitro uses the TRA5381 diff case. The ERevo uses the TRA3978 diff case that comes with metal blocks for the spider gears' pin and to accommodate for the TRA5382X metal block that go between the two spider gears. These metal parts are what is supposed to make the diffs stronger and the EREvo diff case is different from the nitro one so that the metal blocks fit in it. There are two spider gears in the diffs but for some reason the exploded view only shows one.

squeeforever · 03.05.2009, 02:29 PM

Quote:

Originally Posted by Semi Pro

how so?

i had a 2.5 and i now have a platinum and they are the same

try losening the slipper alittle more and dont gun it or brake hard after landing a jump and they should hold up alot better

aluminum cases and the inner brace will help but the only other fix is the massively over priced FLM conversion

Quote:

Originally Posted by JThiessen

I'll bite...how so? I've been buying the same parts since day one - haven't noticed anything different.

Quote:

Originally Posted by JThiessen

I think Squee was correct, or maybe more that I was somewhat incorrect. The original 2.5R had an "I-Bar" set up in it. I dont recall my first one having that - but...one doesnt always recall everything! The 3.3 diffs are configured the same as the E-Revo, just some parts have an X designation, which may or may not mean something

Quote:

Originally Posted by madmaxx

the e-diff's are different from the nitro diff's, the e-diff's use a spider gear support bar

proper shimming of the diff is necessary for both e-powered/nitro IMO

i run shimmed, alu diff's with Robinson R&P

Quote:

Originally Posted by JThiessen

It appears you are correct - I had my pages mixed up, hence why I didn't recall seeing that support in there.

Looking at the exploded view, it appears that there is only one spider gear - is that correct?

Quote:

Originally Posted by mistercrash

The diffs of the nitro Revo and the ERevo are different. The nitro uses the TRA5381 diff case. The ERevo uses the TRA3978 diff case that comes with metal blocks for the spider gears' pin and to accommodate for the TRA5382X metal block that go between the two spider gears. These metal parts are what is supposed to make the diffs stronger and the EREvo diff case is different from the nitro one so that the metal blocks fit in it. There are two spider gears in the diffs but for some reason the exploded view only shows one.

Correct...For the most part. If I'm not mistaken, that support bar is now in the newer model 3.3 as well as the E-Revo, Slayer, and the T-Maxx 3.3 and E-Maxx 3905.

They pretty much all have it now I believe, but the original 2.5R and the old 3.3 didn't.

mistercrash · 04:03 PM

If you go and check the exploded views of the T-Maxx Classic, the newer T-Maxx 3.3, the Revo #5308 and #5309, the Platinum Edition Revo and the Slayer, you won't see any of those metal parts in the diffs that are in the diffs of the electric Traxxas vehicles, E-Maxx, ERevo. But of course I can only refer to what I see on the exploded views of those vehicles as I don't have experience with all of them. But I'm pretty sure that those reinforced diffs were introduced only in the electric versions of the Revos and T-Maxxes.