Recommendation? Stomski Precision Shift Coupler

[911freek]

Hey everyone, I'm thinking about upgrading my '75 911 (5-speed 915). Has anyone here gone through a similar upgrade and can share their experience?
Thanks!

https://www.pelicanparts.com/More_Info/STOMSKISR010.htm?pn=STOMSKI-SR010&bc=c&SVSVSI=0567

[Showdown]

It’s a no-brainer; buy it and never look back.


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[MrBonus]

Yes, it's awesome. Get the Rennshift coupler clamp while you're at it for easy adjustment.

[Saadi996tt]

Same here, it’s a great product. Buy with confidence


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[zuch]

+1

[SCforme]

Great product. Also great video on YouTube on how to install and adjust it.

[Mocker]

I just replaced my stock piece with the "Stomski" unit from Tarett Engineering. $212 + shipping.

The Porsche coupler is a caveman design and should be removed and thrown into the deepest part of the ocean. When the bushings on mine failed when my wife and I were out the other night, I couldn't shift out of second gear. I was lucky to be able to limp home.

[Ian Comerford]

I found that the Stomski introduced more noise into the cabin but then its design can’t help but do that. The original Porsche couple has a slight amount of play and plastic (of some sort…) bushings which removes a certain amount of the noise

[CarlPet]

Ditto Ian's comment, Stomski coupling gives a more positive shift "feel" as there is no "give" in that coupling, however, all the NVH from the engine / transmission gets to the gearshift knob so you feel it.

I do not drive my car aggressively so am considering going back to the original factory coupling to isolate the NVH from the cabin.

[911freek]

Folks, thanks a lot!

The comments about vibration and noise are important, I drive the car for pleasure and not for racing, so that's an important input.

BTW, our host seem to charge about 30% more than everybody else for it. Even after the PCA discount it still is about $40 above. Not usual, maybe an oversight?

Dear host, if you are reading this, please review. Thanks!

[Mocker]

The point is--when (not if) the stock coupler's bushings fail, you can be left stranded.

Eliminate a point of failure. The NVH delta is a non-issue, IMO.

[David Inc.]

Originally Posted by Ian Comerford

I found that the Stomski introduced more noise into the cabin but then its design can’t help but do that. The original Porsche couple has a slight amount of play and plastic (of some sort…) bushings which removes a certain amount of the noise

What kind of noise? I've noticed some myself and wasn't sure if it were the coupling or the trans rebuild.

[zprovo]

They are also available direct from Stomski.

https://www.stomskiracing.com/collections/related-items-40/products/precision-shift-coupler

[Geneman]

best part I ever bought for the car

[pmax]

Originally Posted by Mocker

The point is--when (not if) the stock coupler's bushings fail, you can be left stranded.

Eliminate a point of failure. The NVH delta is a non-issue, IMO.

In defense of the "caveman design", a characterization more suited to ... never mind, wrong topic ... , the stock bushings are probably good for ... what ... 10 years and 100K miles, if not more. Might be good to check it every few years though if that is a concern.

My take on NVH is that given the stock drivetrain shifts (no pun intended) around wrt the chassis, the play in the bushings isolates the internals of the tranny so the shift fork, sleeves don't "rattle" as these movements occur. To borrow an expression, rebuilds are more expensive than bushings. Granted, not a concern for racers but that isn't the application here.

[pmax]

Originally Posted by CarlPet

Ditto Ian's comment, Stomski coupling gives a more positive shift "feel" as there is no "give" in that coupling, however, all the NVH from the engine / transmission gets to the gearshift knob so you feel it.

I do not drive my car aggressively so am considering going back to the original factory coupling to isolate the NVH from the cabin.

The NVH gets to the internals of the tranny as well, that's my point.

[Ian Comerford]

Originally Posted by pmax

In defense of the "caveman design", a characterization more suited to ... never mind, wrong topic ... , the stock bushings are probably good for ... what ... 10 years and 100K miles, if not more. Might be good to check it every few years though if that is a concern.

My take on NVH is that given the stock drivetrain shifts (no pun intended) around wrt the chassis, the play in the bushings isolates the internals of the tranny so the shift fork, sleeves don't "rattle" as these movements occur. To borrow an expression, rebuilds are more expensive than bushings. Granted, not a concern for racers but that isn't the application here.

I have to agree and have thought this for a while. The bushings allow a certain amount of vibration to escape, reducing an element of potential damage. Other opinions are of course available but I sold mine a while ago.

[jac1976]

Is there a way to have the best of both worlds? I assume that the more unforgiving the bushings, the more NVH is transmitted, ie the intent and design of the bushings inherently preclude the coupler from being “precise.” All this said, as someone totally ignorant to material dynamics, I wonder if there are “newer” bushing materials that would better bridge this gap.

[Tobra]

The issue you describe is what a lot of people complain about when they go from rubber to polyurethane for suspension bushings. I put RE71R tires on my 911, so I don't worry about that too much

[IS300]

+2 great part