Does the 915 WEVO add noise?

[BuddaLun]

I have been considering a WEVO for my 915 equipped 82' SC for some time now. I am looking at the Classic variant which looks like the original shifter. I plan to use the boot as well.

This is the exact model:
https://www.wevo.com/Products/ShifterProducts/WevoShifterProducts_Shifter-915Classic.htm

After reading countless threads, it appears some say the 915 WEVO adds noise, and some say it does not. Some say the noise is largely mitigated if using the rubber boot.

Why the variance?

TIA.

[Walt Fricke]

The WEVO, like all of the shift kits which make the default shift position in neutral be the 3/4 plane, uses a spring to achieve this result. This means that when in 1st or 2d gear there is a spring pushing the shift lever sideways, so to speak (it pushes down, typically, but that translates into a sideways force).

This sideways force is resisted, when in 1st or 2d, by the end of the dongle pressing against a side of the shift fork slot. Since the shift fork's function is to move fore and aft, pressing against a side [edit] ought not to mess up the synchro, engagement teeth, and operating sleeve, as well as the detent, from keeping you in the selected gear.

But it creates a noise/vibration path back to the cockpit. That's why Porsche put that tab and hook system over for 5th (where it would matter a lot) and reverse (where I don't think it would matter).

The Seine shifter kit includes adding tabs and a hook for 1/2d, which keeps the force up front and resolves the noise issue.

I don't know if the WEVO - which is different in the way it does the job, or the Rennshift could be fitted with something which took up this sideways force up in the shift console. Hayden doesn't think it is significant, and in terms of function and wear I don't doubt his view. But the noise can be noticeable. We aren't in 1st all that long, but 2d around town is a pretty useful gear.

[BuddaLun]

Very helpful. Thank you, Walt.

I have also read that the Seine system "does 90% of what the WEVO does for 1/4 price." If it also does not add noise, it may be the right choice for me.

[rollandburn]

Installed that wevo in an ‘85 recently without the boot and haven’t noticed any problematic sounds. I will say there is a ring in a certain gear atparticular rpm but can’t recall exactly, thinking 3k in 3rd, will report back when the the snows gone. =\


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[NickP]

Walt’s explanation is spot on, and way more technical than I could articulate but my Wevo transmits a pretty irritating noise in 1 and 2 as Walt described. I bought the spring kit from Wevo to take some of that sideways pressure off and it helps. My other car has a Seine and it also centers the shift lever to the 3/4 plane and it’s quiet. I like the “action” of each, they are both direct and precise, but the Wevo noise does bug me. In fairness, I’ve read lots of threads on this issue and many don’t have the noise or at least it’s not bothersome to them.

[RSBob]

Have a Seine and Rennshifter (911 and 914) and no noise issues and great shift action with each. I also know Wevo lovers love their shifter, but my direct experience is with the above.

[BuddaLun]

Thank you all for your insight.

Seems Seine or Rennshift may be the best for me. I do not want to add noise.

[kent olsen]

You just need a louder muffler!!!

[Tremelune]

It's worth noting that a lot of people replace the shift coupler (in front of the rear seats) from a rubber bushing to a solid bushing at the same time they install the Wevo stuff. This would also increase the transmission of vibrations, and might even be the bigger issue at play.

It's very difficult to be scientific with your anecdotes when you're hunched over the seat trying to get things adjusted perfectly for the fifth time...

[BuddaLun]

Originally Posted by Tremelune

It's worth noting that a lot of people replace the shift coupler (in front of the rear seats) from a rubber bushing to a solid bushing at the same time they install the Wevo stuff. This would also increase the transmission of vibrations, and might even be the bigger issue at play.

It's very difficult to be scientific with your anecdotes when you're hunched over the seat trying to get things adjusted perfectly for the fifth time...

Are you referring to the "PSJ" coupler?

[Luftwaffles]

Issues seem to be focused on the Wevo unit. Does the Rennshift not have similar issues? I thought they were basically the same thing. Difference in design?

[carreradpt]

I installed the WEVO coupler last year and am very happy with the crisp shifts. However I have also noticed a bit of "mechanical sound" that I hadn't noticed before. Not irritating just noisier than what I had with a stock coupler. I even reinstalled the original "rubber boot" over the psj rubber boot.

[Tremelune]

Originally Posted by BuddaLun

Are you referring to the "PSJ" coupler?

Yep, or some variation (Stomski Racing makes one, et al).

I have the WEVO Classic in my 1985 Carrera, as well as their coupler, and can confirm that the combination does indeed transmit a fair amount of noise into the cabin. In my car, it's especially noticeable at idle with the clutch out (such as when sitting at a light), where the spinning internals in the gearbox make quite a racket. It's not objectionable (to me), but it's definitely noisy, as is the whole car. But then, I like air-cooled 911 noise.

[Walt Fricke]

The simplest way to firm up the shifting at the coupler is to install urethane or other material bushings which have no slop. The stock bushing is oval fore and aft. Having it be round in its ID, and a tight fit on the cross pin, removes a whole lot of slop. I believe someone makes one like this. I fabricated one (not hard to do). A really clever one involved finding some brass bushings which were a close fit on the cross pin, drilling out the stock bushings to accept these, and reassembling. I don't know if a little urethane in there will kill some of the vibration from getting back closer to the driver, but these are as firm and positive as any of the much more expensive and more labor intensive to install couplers.

Any noise with the car in neutral and the clutch out isn't doe to side loading of the shifting mechanism.