Coupler Whisperer Resonance

[ozracer]

Just installed my bushing at my recent service and getting really noticable resonance at very low rpm. Is anyone else getting this? I also changed to poly trans mounts and engine mounts. My mechanic who is very experienced in porsche race car prep states its noisier than some of his race cars who have full poly suspensions.

the only thing he can think of is that because the coupler bushing has no movement in it at all the resonance is transfering up the transmission rod. Its really quite noticeable under 1200 rpm. Over that its fine from take off or very slow driving at low rpm I think its too noisy.

Anyone else have a similar problem?. He is suggesting going back to stock bushings to see if this eliminates the problem?

Any suggestions?

PS the poly trans and engine mounts have been fitted to [plenty of his cars and he does not have this problem.

[McLaren-TAG]

I'm willing to bet your its your mechanic not adjusting the linkage properly, not the coupler bushings. I noticed no change in additional noise after doing my shift linkage. Now after upgrading to the poly transmission mounts, that's another story.

[bkreigsr]

what year car are you talking about?
suggest going to the 'sport' mounts - be sure to match the engine mounts with the trans mounts.
Bill K

[ivangene]

all gears?

I suspect adjustment
is it a stock shifter? (the lever/housing)
there are tons of little things that are adjustable on the the housings and how they align with the gears through the coupler all effect this - most people have zero issues, but there are always exceptions

HOWEVER - in early cars - we have seen a couple do this in top gear

You can return the bushing for a full refund

since you didnt do the install - it will be hard to determine if the bushings were free moving post install - or if something was binding - if the mechanic is use to the aftermarket bushings that lock up and bind, he may not have been aware of any problems with his install

but all things being equal, they do reduce the gap / which translates to the possibility of noise transfer - so let's get you happy!!

start with describing exactly when, what gear, what rpm's the noise is
we will then either adjust the coupler or maybe the shifter
then we can swap out a stock one as a last ditch effort

sorry to hear there is a noise, however I am not just good at sailing smooth waters, but I can sail through the nastiest storms - I am here every step of the way until things are made right

we'll get it resolved

[ivangene]

OH - and I would bet at least some of his "race prepped" cars have had a Wevo - which is a solid block of steel with 2 steel pins through it - just saying.......

if those didnt make this much noise - I suspect something is mis-aligned
I am unfamiliar with these trans bushings - did he do the motor too...if not that will effect how things work

just writing as I think..... again, at this point it is investigation as to what is happening / when

if you can shoot a video, take pics or whatever- that might help too - you have my email
ed@thecouplerwhisperer.com

we can always transfer files that way too

[ozracer]

Thanks ed went for a longer drive tonite after i pcked the car up it was really quite noticeable in 1st from take off and second under 1200 rpm into 3rd 4th and 5th no issues at all but they are at higher revs. I think it may have subsided to certain extent in my longer drive tonight as it didnt seem as noticeable and subsided quicker but is still there. I have a new clutch gearbox rebuilt and brand new mounts which are poly in the trans and engine.

All bushings are new at the shifter which has been totally rebuilt with a porsche genuine short shifter kit. The housing is stock but gets replacement internals with the kit. Let me know what you think and i will see if i can get a video tommorrow to shoot you from my iphone or similar.

My car is an 84 carrera 3.2 coupe for info.

[ivangene]

OH Boy - that's a LOT of changes all at once

your mechanic has invested a large amount of time in your car, and you a large amount of money in his business

I bet anything he has a stock coupler sitting in the bottom of a tool box somewhere and he could swap it out in 10 minutes

and I bet it does nothing to very minimal on the sound you are experiencing

if he cant muster up a core to test, 'll mail you one just to test with

E

[JAR0023]

Originally Posted by McLaren-TAG

I'm willing to bet your its your mechanic not adjusting the linkage properly, not the coupler bushings. I noticed no change in additional noise after doing my shift linkage. Now after upgrading to the poly transmission mounts, that's another story.

+1

I have Ed's bushings, a Seine gate shifter and sport mounts. I'm not getting the resonance you describe. I did have to spend some extra time fine tuning everything so there is no side loading on the shifter/forks when in gear but that was more the Seine kit. -J

[kodioneill]

My guess it's the poly mounts on the tranny and engine also check the large concave washers for correct positioning.

[DRACO A5OG]

+2 No resonance in any gears/rpms, I have cab sport mounts all around, Sienes Gate Shift kit, I was expecting some sound but none detected.

The noise I did have is gone due to my mistake in installing the throw out bearing spring and locking cup on backwards, but that was more of a clutch noise but in gear I was hearing a rattling which I thought was the gear box, but nope the darn fudge up by me on the T/O/B especially at low rpms, it whined.

She is very quite now, even at stops.

As Ed suggested, swap with an OEM coupling to start the process of elimination.

Next time do one upgrade at a time. this will prevent the guessing game.

Cheers,
J

[Porchcar guy]

With all the changes done at the same time, would you not consider that there might be a settling in period of all the components. I would drive the vehicle through a loop of city and highway for quite a few miles to allow the new parts to bed in...just my opinion :=)

[ivangene]

good point - new trans IMO could make some initial noises depending on set up and if a new R&P were installed

also check gear oil level (I know it sounds simple...but sometimes the obious things are over looked)

[ozracer]

Thanks guys i considered the bedding in period and this may well be correct as i described it appears to have subsided or reduced in sound. Stay tuned will keep you posted.

[rinverso]

kinda weird to me to hear all this work was done, and it was determined to be the coupler. sounds like some who went out to eat and drink all nite long and didn't feel well in the morning and blamed it on the bagel in the morning.
i have the whisper coupler for 3 months now and haven't noticed any resonance at all, just shifts sweetly from 1st to 2nd. aaaah.
thanks ed.

[rinverso]

and by the way, good luck with that. didn't mean to be too sarcastic.

[ozracer]

rinverso I know what you are saying it wasnt a blame situation it was an unkown part he has not used before and was wondering if this may have caused the issue. I suspect its just an adjustment required.

I would like to know why porsche didnt fit these couplers with round holes though I wonder what the method in the madness was.

[uwanna]

Originally Posted by ozracer

rinverso I know what you are saying it wasnt a blame situation it was an unkown part he has not used before and was wondering if this may have caused the issue. I suspect its just an adjustment required.

I would like to know why porsche didnt fit these couplers with round holes though I wonder what the method in the madness was.

Somewere buried in this tech forum is an explanation for the reason PAG decided to use the oval holes in coupler bushings. I read it several years ago, but can't find it with the wonderful(sic) search function! It was something about the oval holed bushing
acting like a rudimentary universal joint and also allowing for movement of the engine/trans unit. I wish someone could find it.
I'm quite sure PAG didn't just use the oval holes on a whim!
By the way, I have installed Ivangene's bushings, and they are working wonderfully!

EDIT UPDATE: I found the thread with the discussion on the reason for the oval holes in the bushings. Read post #14 by wevoid
Shift coupler for 915?

[Juggino]

I have several of Ed's parts including his coupling and no issue with any of them. Ed did help me to get everything tuned in and because of his parts my 915 is very drivable, night and day difference.