That is correct, we will no longer be producing them.

I believe your issue to be specific to your vehicle. I have personally not heard of a balance issue to date from our units, let alone two units back to back. Like others in this thread stated, it can be a variety of things.

Thanks,
Eric

I'm very curious about the diff bushing thing so I'll remove that and see if the vibration goes away

Nice let us know the results!

Would you suspect trans / differential - mount / bushing inserts to be a possible factor?

Stiffer bushing can only amplify a vibration issue. If there's no vibration with stock shaft, the culprit is the new driveshaft. With soft bushing the vibration is less noticeable, but it's there.

Yes but the bushings make a huge difference, especially if there is more than one type at the same time. I spent a couple hours researching this today across multiple platforms and pretty much all say that once you remove diff and/or subframe bushing *inserts*, the vibration either goes away or is drastically lessened.

I'm going to try removing the diff inserts (KDT925) next week and will report back. Hopefully it helps

Stock diff bushings did not help me. I am running solid subframe mounts though so that isn’t helping.


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I honestly have no idea; I just know how many units we have sold and how few complaints we have seen from vibration. To have two units have seriously bad vibrations at only 80 MPH, I think it's more vehicle-related than component-related.

Yeah apparently they raise the subframe and change the angle, which results in vibration, according to all these forums I read through anyway. Are you also having vibration at 80 mph?

I am running stock height settings with the solid mounts.

Mine is at about 105mph with mild resonance on decel around 65.


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Angles no longer have to line up with cv's
U joint driveshafts rotate in an elliptical with different velocity in a single rotation and the yokes have to be in phase.
CV= constant velocity

I understand the differences between the yoke types. I was asking if he could give any info as to why the company made the switch. He answered likely with as much info as he could put out for the company.

Took out the Whiteline diff bushings (KDT925) and briefly took the car up to 140 km/h (86 mph) and the vibration was vastly reduced. Gotta try it again for a bit longer, as this was only for a few seconds. Will update tonight

Take the 407etr at night. I don't feel anything even at 105mph (all OEM mounts/bushing) but most likely will at a higher critical speed. 2 piece stock driveshaft will be good to the speed limiter

Glad to hear it helped for you. I still have too much other shit bolted to my car I think is not helping.

Keep in mind I also have:

-whiteline subframe inserts
-perrin trans mount insert
-whiteline shifter bushing
-perrin engine mounts

Okay so just to confirm, 95% of the vibration is gone with the diff bushing inserts removed. Prolonged driving at 86 mph did not produce any, none that could be telegraphed to the cabin anyway.

Anybody on STi bushings with carbon driveshaft?

For those with a one piece driveshaft and MT, can you measure the pinion angle?

I am a happy customer with a Versus carbon driveshaft for automatic transmission. The only suspension modification is the brace for differential. Absolutely no vibration problem at any speed (up to 100 mph). The quicker acceleration from the lower rotational mass is noticeable.

Try tightening the DS bolts that hold the DS to the yoke. Apparently makes a big difference re vibration issues. It's a pain in the arse to get them properly tensioned. Tension the bolt and NOT the nut in this instance. You can also rotate the DS 90 or 180 deg to see it that helps.

Do you have any other mods to the GB or diff mounting. Inserts or replacement bushes for example?

Had no such issues with mine which was delivered and installed in November '21. Having bought a lot of Verus stuff, if they make it then it's 100% right.

One hundred percent correct re the quicker acceleration due to lower rotational mass. I was really surprised how noticeable it was..

I'd heard that before I pulled the trigger on mine. That leaves very few manufacturers. In my experience well worth the effort of changing to one. Pretty sure Verus are seen as by far the best.

I have the STI engine mounts and Whiteline GB upgrade with my CF DS.. I also have the Whiteline subframe inserts.

I also have the IRP shifter to add to the rattle/NVH battle!

I did have the diff inserts but removed them due to NVH. Having said that apparently just installing the rear diff inserts does not result in NVH.

Verus driveshaft discontinued? What to buy?
 

Verus site page for our driveshaft says "*Manual Driveshafts are no longer in production*".
Now what?
I was about to order the PST, over the Driveshaft Shop's, because of weight difference. DSS lists theirs as 25 pounds and PST says 13.9 pounds.
I'm never going to go for huge power so I see no reason not to buy the PST.
FYI, I am road racing and not drag racing.
Thoughts?

No. They list stock as 24.something, I think theirs weighs 12.9. check again :)

I would wonder what the critical speed on the DSS carbon shaft is since the aluminum one is pretty low.

Not sure where your info is coming from, but the response from Verus is that they are discontinued because of the exorbitant cost to make them. They have two for automatics in stock and that's it.

As to wondering what the critical speed (RPM's I assume) on the DSS carbon shaft or saying that the aluminum one is rated as low, I have no idea what dragoontwo is referring to. I've only seen power ratings.

I think you misunderstood, I was only talking about the weight of the DSS driveshaft. Maybe I misunderstood? Haha

Here's some light reading about their aluminum shaft.

https://www.ft86club.com/forums/showthread.php?t=148537

Page 4 is where you get to the naughty bits. IMHO, You need to read up on critical speed and pinion angles before throwing any single piece driveshaft in a twin.