Stock Wraith Driveshaft bolt modification

[madkawi650]

Used a metric bolt.. Forget the exact size, I think 7mm maybe 8mm. Used the right length for lengt of driveshaft. I cut the head off the bolt and cut a slot in the end, Then threaded it in with a screw driver. It is an barely snug fit and will keep the shaft from collapsing and then twisting under more power than 2s with stock system.








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[frdtrkguy]

Cool idea, is it holding up to some abuse?

[GrimJeeper91]

I like the concept. Since the primary failure mode is collapsing when twisting it should add quite a bit of strength. The samething can be accomplished using a plastic rod or wood dowel without a loss of power from the added rotational mass.

[rockspider]

Any 6mm bolt or rod or tube will fit the same.
Actually it's much easier (and lighter) to use 6mm alu tube (the one commonly found at DIY shops is 6mm OD and 1mm wall)
Just cut to size, press it in and done, voilà! No more collapsed inner driveshaft.
Mine is holding well, from August no more broken driveshafts, with 3s and long-case 650 motor, on any kind of use, also lot of rockcrawling

[madkawi650]

The wood or plastic would work great too, but i wanted to to be removable to be able to change ends..


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[tklatti]

I just used old axial alum links that I had laying around. Just used tubing cutter to get the right length.

[wildcardco1998]

If you wanted to keep it really light, you could also use carbon fiber kite tube.

[nosyajg]

i picked up a 4" brass door hinge pin and cut it in half...holds up to a mamba 5700 motor and clod tires...

[skid]

Same idea linked here, different method

Beefing up the stock drivelines

I also sheared a few off at the begining of the splines after sleeving.

[madkawi650]

Originally Posted by tklatti

I just used old axial alum links that I had laying around. Just used tubing cutter to get the right length.

Just tried your link idea.. Way better than my bolt idea.. Much lighter and easier to do.. Just a tad more pricey than a bolt..but hey, it was an old scratched up link anyway. Lol


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[ebomb]

I did the same with a 1/4 20 bolt , works great

[halfcab]

i never understood how you guys are even blowing up the stockers anyway, ask any of the norcal guys that know me and I drive all my rigs like I stole them even my bruiser/blazing blazer hybrid, i was running my wraith with a brushless 3s set up and never broke anything but the front bumper and that was because I trimmed off the Dumbo ear hoops off of it

[norco kid]

I did this mod with a 6mm aluminium tube, but there is now a lot of friction between the male/female sides... They don't slip together as smoothly as they did without it. The tube obviously expanded the diameter of the male shaft a bit.. Is this normal?

[nosyajg]

no...mine slides freely...

[CreativeCrawler]

I just took two 6Mx50 bolts, trimmed and slotted. Screwed them in and it slides just fine.

I also turned my drive shafts around so the male spline is up near the trans.

[TwistedMetal]

Originally Posted by GrimJeeper91

.......without a loss of power from the added rotational mass.

Not gonna lose much power from a 6mm piece of steel spinning. Hardly any rotational mass added there. Would def not notice any kind of change. Think about the people runnin mip driveshafts.

[Eric0424]

Originally Posted by GrimJeeper91

I like the concept. Since the primary failure mode is collapsing when twisting it should add quite a bit of strength. The samething can be accomplished using a plastic rod or wood dowel without a loss of power from the added rotational mass.

Not so much you would notice a "night and day" difference, but yes it does add to the rotating mass of the driveline. The ridiculously low gears in the crawlers sort of hides the added mass. So most people don't notice much if any loss in performance since the driveline still spools up quick due to the low gearing.

[TwistedMetal]

They won't notice any difference in that. It's not far enough from the center of the spinning to create much drag on the driveline at all let alone notice any difference at all.

I agree in a technical sense it does add rotating mass but since the weight is so close to center it doesn't add much at all.

[Eric0424]

Originally Posted by TwistedMetal

They won't notice any difference in that. It's not far enough from the center of the spinning to create much drag on the driveline at all let alone notice any difference at all.

I agree in a technical sense it does add rotating mass but since the weight is so close to center it doesn't add much at all.

Yeah, technically. I'm wasn't speaking mystically or spiritually. It's there, the fact some will see it while others don't is just a matter of perception. If you wanted to go through the trouble of recording your standing-start to 5-ft or 10-ft times you would see it. Most won't care if they lose a few hundredths or a tenth of a second on acceleration as it's just not that important with most crawlers.

Yes, if it were further out from center it would be more drastic and more people would notice, but that doesn't mean anything 3mm or less from center has no effect.

Anyone wanting to try this with minimal added mass should consider 6mm dia. graphite rod or acetal (delrin), or aluminum bar, or anything lighter than steel.