[rhudeboye]

here you go, new mod.. and it doesn't get any more spartan [img]style_emoticons/<#EMO_DIR#>/tongue.gif[/img]


[img]style_emoticons/<#EMO_DIR#>/laugh.gif[/img] [img]style_emoticons/<#EMO_DIR#>/laugh.gif[/img] [img]style_emoticons/<#EMO_DIR#>/laugh.gif[/img]

I think I'm gonna order the same as in the OP but w/ white lights.
I was hunting for a 993 carbon fiber but I think I would be just as happy with the other now.

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[rhudeboye]

I've been digging through a lot of old post of late. Learning a lot about the car. This thread is very interesting. So many great minds at work and so many remedies offered to cure the rattle noise.



So did anyone find a way cure the buzzz?

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[bombfactory]

It depends on the amount of vibration and noise you're prepared to live with. After spending a few hundred dollars buying a 997 shift knob and having custom leather work done to it, I hated the feel and couldn't take the noise and removed it immediately. Expensive experiment.



I'm not thrilled with either its looks or shape (I prefer my shift knobs to be a perfect sphere), but pretty much the only 100% cure for vibration/noise is to stick with the stock shifter.

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[Cloud9...68]

Austin is right. For most aftermarket knobs, the noise in incurable, unfortunately.

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[ds968]

The only buzz I get now with my 996 CF/Aluminum shift knob is barely audible and only happens over a brief, very specific point ; between 2400 and 2800 RPM .. and, you have to be parked, inside a garage, all car doors and winows closed, radio and air blower off, to hear it.

I stuffed velcro ( the fuzzy side ) between the shifter and the knob chamber, for the entire length of the shifer arm, and it was still buzzing a bit UNTIl I LEFT THE BASE SCREW of the knob UNTIGHTENED one time, and suddenly noticed the buzz volume dropping to half of its previous level.. The knob is "stuffed " on the arm on so tightly that there is no way it will move/come up with shifting, so that screw serves no purpose. No idea if this system works with anyone else's after-market knobs, or even if it will act the same in another car with that same 996 CF/Alum shifter which I have, but worth a try, IMO..

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[bombfactory]

I have a real nice aluminum/leather 997 knob with integrated leather boot that'll fit the 968 if anyone wants to experiment. 100 bucks? (for my pain and suffering)

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[Cloud9...68]

It's worth trying Dan's method. Unfortunately, it didn't work for me (aluminum 996 GT3 knob).

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[ds968]

Bicycle tire inner tube rubber may work well as a sound dampening device with other style shifters ( if there is enough room to stuff enough of it inside) and while the vibration will probably still be there and felt when your hand is on the shifter, the noise itself could be reduced susbtantially..



I just can't stand the look of the oem knob on this car, in addition to being simply ugly, I also think it's the only thing that dates the car, it and really makes ithe interior look like a 944... so I would rather put up with a little noise instead, but fortunately I don't have to do that now..

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[Cloud9...68]

Dan,



You've come up with some creative things to stuff between the shift knob's cavity and the shaft! My latest attempt was plumber's teflon tape - it was nice and squishy by the time I got it thick enough to make a snug fit, so I had high hopes for it (OK, not really, based on all my and others' failed attempts...), but it appears that the noise is actually coming from lower in the linkage, as opposed to directly from the knob itself. There are some complex harmonics in play, making this a very difficult nut to crack.

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[ds968]

Yup, the lower linkage spot is the culprit.. no way to eliminate the vibration itself I think, so the weight of the oem knob just manages to counterbalance it enough to make a difference, and the rubber bumpers inside the chamber further eliminate the noise because there is enough space for them to compress to the point of dampening any resulting buzz. I even tried to put lead weights strips in the 996 knob chamber and some wrapped around the shifter base as well, to add mass , but to no avail. So I resigned myself to the point of living with the vibration , but without the noise I forget it"s even there..

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[DaveN]

Changing the shift knob in a 968 reminds me of the ol' saying your mom always said- "Leave it alone and don't pick at it" <img src="/forum/images/smilies/968/wink.png" class="smilie" alt="" />

It's the one thing I will never change after almost 4 years of reading shift knob posts.

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[Rap]

After reading these post I realize that this was the problem the first 968 that I looked at and didn't buy had! Wow lucky me.

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[ds968]

Ha, funny to see the mom quote... And man, have I heard that same " leave it alone and don't pick at it " advice so many times .... Hmm, let's see....what prominent member / owner of this forum here might not subscribe to that " leave things as is " school of thought . . ? ;-)

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[DaveN]

Rhymes with Cash, Mash, Bash, Dash, Gnash, Hack & Slash? Thankfully not Crash. <img src="/forum/images/smilies/968/rolleyes.gif" class="smilie" alt="" /> <img src="/forum/images/smilies/968/laugh.png" class="smilie" alt="" />

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[flash]

lol - stock shift knob for me though

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[AJG]

[quote name='flash' timestamp='1269075339' post='89775']

lol - true enough



seriously though - until we started talking about it, i never thought about adding mass to the linkage rod, but the more i think about it, the more i think that might just work - i think that a shaft collar clamped to it just might do the job

[/quote]



clamping a collar might not neccesarily work unless the collar has sufficient mass to prevent oscillation. It might be better to inhibit movement along the shaft and allow the collar to soak up vibration by not being mechanically clamped to it somehow, again some mass is required to operate properly. A pair of bushes placed along the shaft and tied to some other structural item would work quite well too possibly. I'm feeling Deja Vu about this.



Andy

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[flash]

yeah - collar didn't work - could not get the mass in the right spot

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[Cloud9...68]

Someone on .net years ago claimed a weighted collar cured his shifter's buzz, but since than, I've never heard of anyone having success with this. It looks like certain things help somewhat with certain types of aftermarket knobs, but a universal solution remains elusive. Maybe somebody could convince a university to have this be some mechanical engineering grad student's masters thesis <img src="/forum/images/smilies/968/smile.png" class="smilie" alt="" /> .

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[TonD]

[quote name='DaveN' timestamp='1318718099' post='116721']

Changing the shift knob in a 968 reminds me of the ol' saying your mom always said- "Leave it alone and don't pick at it" <img src="/forum/images/smilies/968/wink.png" class="smilie" alt="" />

It's the one thing I will never change after almost 4 years of reading shift knob posts.

[/quote]



Dave, I've noticed before we have (at least in certain topics) similar ideas/tastes. I wouldn't want to change my shifter for a non-OEM either. But I DO want it to look fresh and new. And I have a suspicion that yours does... Any advice? <img src="/forum/images/smilies/968/smile.png" class="smilie" alt="" />

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[DaveN]

As far as shifters go I have nothing suspicious or remarkable; ask the wife <img src="/forum/images/smilies/968/wink.png" class="smilie" alt="" /> I may consider changing the insert to a clean stainless one though. At least that won't cause a buzz - hopefully Porsche didn't tune the weight to within the gram!

I prefer a fairly stock look to my car and anything I would do will only enhance the clean lines and colour contrast of the original design.

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