Verus Carbon Fiber Driveshaft - New revision
 

Received new driveshaft & installed yesterday. Much different design from pictures on website. They assured me it was fully tested, and stronger than previous. Not sure why that was needed, or what they are correcting. Weight now over 15 lb. Have vibration at 80 mph and over. Waiting for Verus response.

Response about what exactly?

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Well that's not good. I also have vibration beyond 80 mph but with an alu driveshaft and was hoping a carbon one would take care of that.

Interesting. Maybe the design was changed for a universal jig application (vs per model production)

This is mine fresh from the box 2 years ago

Vibration issue.

But should you expect a lil bit of vibration at those speeds?

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No. Vibration is really really hard on shit.

any other stiffening mods to the car like bushings etc? Also how many miles on your tranny, you can check the bushing between the driveshaft yoke inserts into the tranny to see if its been wiped

shouldnt vibrate at all.

back in time when i had RSX-S, i had aftermarket stiffened motor mounts which vibrates at idle which is normal but vibrating at driving is not normal. (educate me if incorrect)

@VerusEric Can you give any information on why you transitioned to CV joint on the driveshaft?

21K, poly bushing inserts in diff & subframe. Was smooth as silk before driveshaft. No other mods made at same time.

Not unexpected, Verus has requested that I rotate 90° and retest.

Will report back.

FWIW, I've rotated my - albeit - aluminum driveshaft through all 4 positions and some of them delayed the onset of vibration by maybe 2-3 mph, but not cured it. So I'm going back to stock.

Quite a lot of people have had the same experience. Do you also have trans/diff bushing / stiffer engine/trans mounts?

Current thinking is that the 2 shaft design was paired specifically with the potential NVH of 86 platform to remove vibrations and break potential resonance. Carbon fiber provided some dampening and people generally got better results compared to AL

It could be a self selection bias here where the only people that get one piece driveshafts are the ones that want stiffer response everywhere in the drivetrain by add stiffening, more NVH is added as input and the chassis + one piece driveshaft gives the resonant vibration transfer function. I also have a DSS aluminum without any bushing/mounts and its fine even to 105mph. Just a datapoint.

This is also assuming the tail bushing on your trans isn't wiped

Are you MT or AT?

2015 FR-S MT

Yes I have Perrin engine mounts and trans support and the Whiteline diff bushings and shifter insert. The fact that it appears at precisely the same speed every time (unless I'm driving uphill or downhill - then it's sooner) kinda makes me think it's got an inherent flaw. Then again the previous owner didn't say he had any NVH issues. I don't remember who he was now, would've been useful to ask him if he had any bushings. Perhaps we should create a poll

I'd wait for Verus to come back to you before stressing too much.

Ok, story time! I bought a 2nd hand CF Driveshaft Shop one and had vibrations from the start. I ended up taking it to be balanced, which was difficult as here in Aus no one I spoke to had balanced a Cf driveshaft before. The first place just shimmed the unis which helped a little but I still had vibrations. The next place I found did a much better job but they weren't sure on how to attach the balance weights. They ended up just taping them on the shaft, leaving it to me to attach them permanently. I was ok with this as they didn't even charge me, in fact they nerded out quite a bit about the CF. I contacted Loctite about gluing steel to CF, bought the product, borrowed an applicator from work and here I am 3 years later with a light ass drive shaft that is as smooth as silk at any speed that I have been brave enough to drive at.

Is the driveshaft clearcoated in some way? Or is it bare CF? Did you sand/scuff the CF before gluing?

What max speed?

I have one that may be a culprit of a harmonic vibration at around 130. Talked with Verus on it and with my gearing it was balanced at a speed of 165 mph. Have not worried about it, all the tracks I drive on 110 is about the max speed.

Rotated 90°, no apparent change.
Verus has shipped replacement.

In the 2nd picture the flange looks bent right where you see that burnt blemish mark. I suspect that if the mating surface isn't flush then that would cause severe vibration issues.

I believe that is an optical illusion, due to camera lens angle. The outside of the flange is scalloped, so anything other than 90° appears as less than flat.
Surface checked perfectly flat prior to install.

You can try to back out your mounts/bushings and inserts to see if the vibrations shift or go away. I suspect that it will but could be PITA to do again. if it does alleviate the problem, have to decide which of the two things you want to keep

Installed replacement shaft, unfortunately same at 80mph + as first one, plus experienced an even greater amplitude vibration when slowing, in the 75-65 mph range.

Did you do the install or shop with experience did?

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Problem is - which bushing/insert do I target. And yeah the diff bushings, I'm not sure what those do, but the trans insert, shifter bushing and engine mounts I like a lot.

I did.

Had the same issue. Sent it straight back and received a full refund. No way I am accepting a 15lb part that is advertised as 10.9lb. What a ridiculous detail to leave out on a part where the primary point is weight reduction.


http://i.imgur.com/r2xydHS.jpg
http://i.imgur.com/hyh8fwl.jpg
http://i.imgur.com/Lg7ZtCv.jpg

Agreed. I was told "they didn't have time to update web site" :mad0259:

If you guys are expecting an OEM level of NVH from a 1 piece drive shaft it’s not happening. I have had a number of carbon drive shafts on different platforms and they all make some noise at certain particular speeds. My BRZ is otherwise stock and my DSS carbon shaft starts to get a little noisy around 80, settles down, and then starts to get noisy again around 115-120. It’s not some violent banging or anything, but a buzz or hum that is slightly audible over the normal road noise.

I have experienced similar on several platforms, and this is much more than "a little noisy". At 80+, fairly severe vibration of entire body structure.

^ ditto

It's like the car all of a sudden gained a couple of subs and they're about to vibrate the doors off the frame. Very sudden and unpleasant.

Yeah, that sounds like a more significant problem. On most shafts I have seen they epoxy small weights to balance them. The new style verus shaft seemed to have a couple weights riveted on. It’s a dramatically different design in many ways.

Interesting read on the G37 forum. Seems they also had problems with driveshafts vibrating after installing diff bushings.

https://www.myg37.com/forums/engine-...ushings-2.html

Not understanding the solution fully though as I let my mechanic do all the work. They mention "flipping" the diff bushings fixed the issue.

No clearcoat just the resin. I did scuff it.

Interesting. I'm thinking it's more pinion angle correction, in their case. I don't think typical poly bushings for twins change the angle that much. Could be just problematic angularity in any case, that the stock shaft compensates for.

~170km/h

The strength of the unit is dramatically increased with the revisions.

Received this from Verus today:
"We do not plan to bring these back into production once this last allotment we have in stock is gone. We will also not be redesigning them, so there is nothing we can do about the weight. If we figure out what the issue is, we will certainly let you know."