New Flux diffs in a few weeks !

Right from Mark at HPI. Quote:
"We have a completely new and built up differential set coming out in the next 2 or 3 weeks. Tentatively called the Bullet-Proof Differential Set. This should solve all the differential breakage problems once and for all."

We shall see, I hope!

[Nard Cox]

Damn .. that's to late I think I just broke my front diff :(

[Finnster]

I saw they are releasing a new machined idler gear as well. Fewer teeth for a low tranny ratio (BrianG will have to update calc.)

Is this purely for speed, or have people been blowing up the tranny? I know they are cast parts, and have seen a few reports of breakage, but IDK if this is a good upgrade or not. I am nearly done collecting all the parts for my Sav XL conversion, but still need the idler and I'm not sure if I should wait for this part or just buy the cast cheapie idler.

Kudos to HPI to keep moving the Sav to an even more solid truck.

[Slowkrawl]

Hopefully they are going the right direction with it. I broke both the front and rear pinion gears in my diffs and have since gone to the nitro pinion's with an added shim. I am kind of seeing how much abuse they will take so I have been doing standing backflips pretty much as much as possible haha. They have been holding up for a while now. I think the teeth on the stock diffs are TOO hard and just shear right off.

[rhylsadar]

hi

the "diff" problem exists since the savage turned up 2002 and was converted to brushless (or high power nitro engines). there are endless modifications of the savage diffs including the sliding blocks that were invented by advanced users long before hpi or traxxas put them into their factory diffs.
the usual reaction to diff damages was always to strenghten the diffs more and more. today e.g. cen diff mod or whatever mods are made to make the diffs stronger.

imo it is time to look at the problem from another perspective. more flexibility in the tranny especially the shafts would help. i am pretty sure good quality plastic shafts would help a lot to preserve damages on the diffs. in the case of a breakage replacing an outer shaft is much easier done and less time and money consuming than replacing the diffs. the tranny of the savage is just too "rigid" imho.

some nice high quality plastic shafts for the savage would be a very nice tuning part i would not hesitate to buy!

just my 2 cents

bye
rhylsadar

[JThiessen]

Not a bad theory rhylsader. But....In my experieince with the Revo (I know, a different beast), both are suceptible to failure. At least with the Savage line, shafts are at least not a known breaking point.
I have yet to blow a diff on my Flux - 7 months of running it now. I've broke a few other parts (bumper mounts front and rear). Which brings up one beef with HPI - why in Gods name do they need to sell complete tree's of parts???? I gotta buy the entire bumper assy just to get the one piece I broke. Maybe in the long run it will be cheaper for me, but for right now, it seems like that will drive up my cost.

[rhylsadar]

yeah i also have quite extensive experience with maxxs and revos. and sure those shafts break from time to time. however i am quite surprised how good the standard diffs of an e revo e.g. hold up even under 6s abuse. the small trx diffs are imo on an absolute level weaker than the savage flux diffs. but they hold up pretty fine. of course the maxx/revo is weighing less than a savy nevertheless with some powerful BL setups the stress on the tranny is still there. i would think that the plastic shafts for the savage should be stronger than the trx shafts... maybe more like the new summit shafts or the like.

of course i am not sure if this would work out well as there are some many other factors. people who perform (senseless) standing backflips or jump and land with throttle/break still are able to break anything. last but not least an adequate slipper adjustment is important. but everything else equal i could easily imagine high quality plastic shafts would help to prevent diff damages and would produce a new intended breaking point in the case of too high peak impact.

bye
rhylsadar

[Gdot]

Originally Posted by Slowkrawl

Hopefully they are going the right direction with it. I broke both the front and rear pinion gears in my diffs and have since gone to the nitro pinion's with an added shim. I am kind of seeing how much abuse they will take so I have been doing standing backflips pretty much as much as possible haha. They have been holding up for a while now. I think the teeth on the stock diffs are TOO hard and just shear right off.

did the same nitro pinion thing on my flux stuff and bingo, no more broken diffs. since I fixed the diff pinions, I've flew apart 3 trans gears.. diffs perfect. That's better.

So are you all saying the new trans gear will change the internal gearing? runs on the other gear in the trans or what??

[Finnster]

Originally Posted by Gdot

did the same nitro pinion thing on my flux stuff and bingo, no more broken diffs. since I fixed the diff pinions, I've flew apart 3 trans gears.. diffs perfect. That's better.

So are you all saying the new trans gear will change the internal gearing? runs on the other gear in the trans or what??

The idler now has less teeth, dropping the FDR.

Interesting bit on the flux diff vs nitro pinions..

[JThiessen]

Originally Posted by Slowkrawl

Hopefully they are going the right direction with it. I broke both the front and rear pinion gears in my diffs and have since gone to the nitro pinion's with an added shim. I am kind of seeing how much abuse they will take so I have been doing standing backflips pretty much as much as possible haha. They have been holding up for a while now. I think the teeth on the stock diffs are TOO hard and just shear right off.

Originally Posted by Gdot

did the same nitro pinion thing on my flux stuff and bingo, no more broken diffs. since I fixed the diff pinions, I've flew apart 3 trans gears.. diffs perfect. That's better.

So are you all saying the new trans gear will change the internal gearing? runs on the other gear in the trans or what??

What part number are you guys putting in there? From what I could find, the Flux supposedly had the "good" parts in the diffs - but being new to HPI shopping, I could have overlooked it somewhere......

[lincpimp]

Originally Posted by Finnster

The idler now has less teeth, dropping the FDR.

Interesting bit on the flux diff vs nitro pinions..

If they are only changing one gear in the tranny the case must also be different. If the idler has less teeth it will be smaller in diameter and it will need to be placed closer to the gear it meshes with in order to work correctly...

[JThiessen]

Originally Posted by lincpimp

If they are only changing one gear in the tranny the case must also be different. If the idler has less teeth it will be smaller in diameter and it will need to be placed closer to the gear it meshes with in order to work correctly...

Where's that "DUH" emoticon.....guess I'll just use this one......

(meaning Linc must be the only sober one here......)

[Finnster]

Originally Posted by lincpimp

If they are only changing one gear in the tranny the case must also be different. If the idler has less teeth it will be smaller in diameter and it will need to be placed closer to the gear it meshes with in order to work correctly...

The flux has the two speed pinion on the input shaft right? I was assuming they were going to use the 2nd gear pinion (being larger) and just place the idler differently on the shaft.

Of course I was purely speculating. Seems easier than making a new case.


Edit: Where's my brew JT?.... lol

[fastbaja5b]

110 runs in, zero diff issues here. Dunno what u guys are doing to them!

[JThiessen]

Originally Posted by fastbaja5b

110 runs in, zero diff issues here. Dunno what u guys are doing to them!

I wonder also, but then when I do - you know whats going to happen....blown diffs....

I also wonder about the people that count how many runs they have....!>!>!>