Engine / gearbox mounts - 987

[T1547]

I'm planning some suspension work to my PASM 987.2 CS in the near future - had an alignment done at CG earlier in the year and they suggested a couple of things to refresh. Plans at the moment...

New dampers (Bilstein B4 Damptronic)
New front lower control arms
DSC Controller

Was considering replacing/upgrading mounts while at it to tighten things up a bit (car is 2011 with 46k miles). I wondered what experiences others have had with upgrading either engine or gearbox mounts, what products used and how it did it effect handling and NVH?

Thanks in advance

Edited by T1547 on Saturday 28th November 10:16

[LennyM1984]

On my first one I had RS engine mounts (gearbox mounts) and on my second one I fitted homemade 85a poly mounts. The homemade ones are actually better in my opinion and provide the same benefits with fewer drawbacks (nvh)

[Edmundo2]

Interested in this also. My car is due in for LWFW and LSD so whilst they're in there it would make sense to do it at same time if it's worthwhile. I'm conscious the LWFW my result in there being slight more mechanical noise and poss marginally more vibration. I'm fine with this as I want a racy drivers car for weekends etc. Just want to be sure that semi solid mounts don't ruin things..Quite a mixed bag of feed back put there..

As per OP question which brand strike the right balance of improved feel without too much NVH? Engine or Gearbox or both?

[Porsche911R]

Rennline do tunable ones with 3 sets inserts.
Would be my choice.
Along with the function 1st mount in yellow.

To the op I would go R shocks if buying new.
Over dsc and new oem PASM.
The 987''s look like rally cross cars and the R setup works a dream for a fun car plus looks great as a lower.

[Cunno]

T1547 said:

Was considering replacing/upgrading mounts while at it to tighten things up a bit (car is 2011 with 46k miles). I wondered what experiences others have had with upgrading either engine or gearbox mounts, what products used and how it did it effect handling and NVH?

Edited by T1547 on Saturday 28th November 10:16

Done both on a GT3 997, engine mount RSS, works well reduces the secondary movement when Corning hard well worth doing on the rear engine Porsche. The gear box mounts do similar but a diminishing improvement due to position within the car.Down side, none as far as I'm concerned with upgrade engine mount, but the gearbox mounts incurred a lot of noise and vibration into the cabin. First set where 100A grade they were replaced with the green 60A sold by tarett Engineering, a much better solution for both road and track imo.

[edc]

I also have 85 shore poly filled original gearbox mounts. The PU is only on the side replacing the hydraulic fluid and not around the stud the other side. You could stiffen it up even more if you wanted by filing around the stud or of course by a harder PU.

[Escy]

I was running the 964RS ones and found them a bit harsh. Using the DesignTek one's now and they are a revelation.

[Edmundo2]

Escy said:

I was running the 964RS ones and found them a bit harsh. Using the DesignTek one's now and they are a revelation.

Is that engine or gearbox mounts?

[edc]

The 911 engine mounts are the same shape fitment as Boxster gearbox mounts.

[Escy]

The gearbox mounts. Bought them here, I said they were for a 987 and the packet they came in said it also, I think maybe there are different versions. Worth checking if you go down this route.

https://type911shop.co.uk/epages/de867ca1-377e-432...

[Edmundo2]

Ok so sounds like RSS semi solid engine mounts coupled with a function first yellow gearbox mount insert would be a good combo if I'm reading this right?

Would stiffen things up giving a more connected/taut feel without being too stiff with big excess NVH? I can expect a small amount more noise but not too much for a fast road weekend toy..?

I can get the RSS mounts from design911 but looks like function first needs to come from the U.S?

Thanks for any advise.

PS. Apologies OP for the thread hijack but hopefully relevant

[edc]

Of you are buying Function First then they now also do the same OE gearbox mounts filled with poly. But knowing how cheap and DIYable these are I coukdn't bring myself to spend that money.

[Escy]

For the front I'm running these Powerflex inserts.

https://www.srbpower.com/products/powerflex-pfr57-...

They are another option, very easy to install.

[frayz]

Running the RSS ones on my Cayman R and they make a nice difference.
No noticeable increase in NVH that i have found, but do tighten the previously unnoticeable slack in the transmission. You feel the car react faster and tighter to changes in throttle application and the whole car feels tighter when cornering.

I'm yet to upgrade the front engine mount with some inserts. I've got a new unfitted set of FF black mounts but i think they will be too harsh for road use, so i think i'll go either Powerflex yellow or FF yellow.

[snotrag]

I used the 964 RS style Engine mounts as transmission mounts in my 986 Boxster, along with a 987 style front engine mount.

It made a big difference and was definitely worth it - only cost about £150 I recall (for the pattern part RS style mounts and bolts/washers).

Exactly as above - made the throttle response more urgent, improved the gearchange and controlled the mass behind you - felt a lot sharper. It was 'mildly' noticeable in the cabin in terms of NVH, but a reasonable compromise I thought.

[T1547]

Thanks for the input all - very much appreciated.

I must admit, it gets confusing with the engine and gearbox mounts, the terms (and parts?) seem to be used interchangeably (or maybe I'm misunderstanding).

Does the consensus for Cayman/Boxsters seem to be go for the gearbox mounts upgrade - something like the below?

Design Tek
https://www.design911.co.uk/fu/prod141475/Performa...

RSS
https://www.design911.co.uk/fu/prod138612/Perfroma...

Any further thoughts on which are better, or much the same?

[snotrag]

I used these - https://www.design911.co.uk/fu/prod133853/Engine-M...

[edc]

The terms are used interchangeably as the same round donut shaped mounts which fit as 911 engine mounts also fit as 986/987 gearbox mounts. The 986/987 engine mount is a bush like an old 35mm camera tub in a large metal bracket/mounting.

[Edmundo2]

I've ordered the yellow FF insert for the front mount, ( but thinking I should perhaps have gone for powerflex if it's a comparable product at z much cheaper price ).

I think I'm going to order 964 RS mounts instead of RSS as sounds like they do a similar job at less than half the money, ( and poss very slightly less stiff ? )

[frayz]

To put it out there, i have a set of lightly used WEVO semi solid mounts in the garage.
They needs the bolts/washers but feel free to drop me a mail if you're interested.

https://www.twinsparkracing.com/shop/wevo-boxster-...