Lennym1984 Posted January 26, 2019 Report Share Posted January 26, 2019 So thanks to @T911UK for sourcing a set, I recently fitted 964/993 RS engine (gearbox) mounts to my 986 2.5... What an upgrade!! The back end feels incredibly tight/solid now, turn in is sharper, and the car settles into the corner almost immediately. There is a little more NVH in the cabin but its fairly subtle and certainly not offensive (I'd say 5% more, nothing greater). For those of you thinking about swapping your gearbox mounts, I'd highly recommend this route. Link to comment Share on other sites More sharing options...
map Posted January 26, 2019 Report Share Posted January 26, 2019 49 minutes ago, Lennym1984 said: So thanks to @T911UK for sourcing a set, I recently fitted 964/993 RS engine (gearbox) mounts to my 986 2.5... What an upgrade!! The back end feels incredibly tight/solid now, turn in is sharper, and the car settles into the corner almost immediately. There is a little more NVH in the cabin but its fairly subtle and certainly not offensive (I'd say 5% more, nothing greater). For those of you thinking about swapping your gearbox mounts, I'd highly recommend this route. Great tip - thank you. Can you share the part numbers that you installed please? Link to comment Share on other sites More sharing options...
edc Posted January 26, 2019 Report Share Posted January 26, 2019 You can get a similar effect by poly filling the OE ones. Did that via @jimk04 a few years ago. Link to comment Share on other sites More sharing options...
Lennym1984 Posted January 26, 2019 Author Report Share Posted January 26, 2019 These are the ones I fitted: https://type911shop.co.uk/epages/de867ca1-377e-432e-84fd-bdccf2206766.mobile/en_GB/?ObjectPath=/Shops/de867ca1-377e-432e-84fd-bdccf2206766/Products/8447 You can buy the OEM RS mounts - Type911 have those also - but they are more than twice the price. Edit: Oh and the m12 bolts supplied with the kit are a perfect length for the 986. I bought some 115mm bolts as well just in case but they weren't needed Link to comment Share on other sites More sharing options...
Lennym1984 Posted January 26, 2019 Author Report Share Posted January 26, 2019 3 minutes ago, edc said: You can get a similar effect by poly filling the OE ones. Did that via @jimk04 a few years ago. I'd guess that the rs mounts are probably more compliant (less stiff) than poly but less (more stiff) than stock. Alongside a 987 front engine mount and a lower stress bar to tie the rear subframe, it feels like a very nice setup Link to comment Share on other sites More sharing options...
edc Posted January 26, 2019 Report Share Posted January 26, 2019 Never had a chance to do a back to back with an RS version and an OE feel is a bit of a dim and distant memory now but when I wrote about it way back when it seemed to have the same effect as you write. No harsh vibrations. A tighter feeling. Even a shade more positive gearshift. Seemingly the panacea of all the benefits but none of the downsides. With the OE mount there are 2 sides. You can fill the hydraulic fluid side as I had done or go the full monty and set the stud the other side in poly too. Link to comment Share on other sites More sharing options...
Lennym1984 Posted January 26, 2019 Author Report Share Posted January 26, 2019 Well I have just listed my old mounts for sale if anybody wants to try this... I agree totally though that there are a lot of benefits with no real downside. I'm looking foward to giving them a go on track within the next few months Link to comment Share on other sites More sharing options...
edc Posted January 26, 2019 Report Share Posted January 26, 2019 Function First are now advertising these at USD275 a pair ... http://www.function-first.com/products/engine-trans/trans-mount-upgrade Link to comment Share on other sites More sharing options...
the baron Posted January 27, 2019 Report Share Posted January 27, 2019 Is it a big job to replace the engine mounts, something you can do at home with basic tools? Link to comment Share on other sites More sharing options...
Eddy555 Posted January 28, 2019 Report Share Posted January 28, 2019 I've done the front one at home OK, I'm not sure about the side (gearbox) mounts though. Link to comment Share on other sites More sharing options...
golfprorich Posted January 28, 2019 Report Share Posted January 28, 2019 56 minutes ago, Eddy555 said: I've done the front one at home OK, I'm not sure about the side (gearbox) mounts though. Dead easy with no exhaust fitted!! Link to comment Share on other sites More sharing options...
Lennym1984 Posted January 28, 2019 Author Report Share Posted January 28, 2019 I rented a lift to do the gearbox and engine mounts. I'm sure you could do it on stands but some of the bolts would require a bit of contortionism to get at unless you can remove the exhaust first. My top tip is to fit a lower stress bar before doing this job. If you do, it'll allow you to remove the triangular plate and sub-frame braces without screwing up the alignment Link to comment Share on other sites More sharing options...
the baron Posted January 28, 2019 Report Share Posted January 28, 2019 I think i will leave this to my regular Indy, i will only end up having to go there anyway as I’m bound to fek it up and will cost me the extra of a flatbed to get it there🤪 Link to comment Share on other sites More sharing options...
mermade Posted February 7, 2019 Report Share Posted February 7, 2019 the poly route is cheaper and easier... with the same benefit https://powerflexstore.co.uk/porsche/boxster-986-1997-2004/ Link to comment Share on other sites More sharing options...
edc Posted February 7, 2019 Report Share Posted February 7, 2019 19 minutes ago, mermade said: the poly route is cheaper and easier... with the same benefit https://powerflexstore.co.uk/porsche/boxster-986-1997-2004/ But none of these pre made bushes will work for the gearbox mounts. I have a friend with a 996 who used the engine mount insert and now has a crappy vibration. Link to comment Share on other sites More sharing options...
Sonic909 Posted February 16, 2019 Report Share Posted February 16, 2019 On any road car : don’t use poly bushes! Link to comment Share on other sites More sharing options...
Berni29 Posted October 9, 2020 Report Share Posted October 9, 2020 Hi Just to bring this one back to life, I filled the lower void in my standard engine mounts with 65 hardness poly, and now I get a nasty vibration at idle. I really do not like it. I am going to get some of the RS mounts off of Type911 and fit those. I have Porsche RS mounts on my 993 and I do not get any NVH from them at all. All the best Berni Link to comment Share on other sites More sharing options...
½cwt Posted October 9, 2020 Report Share Posted October 9, 2020 On 2/16/2019 at 12:17 AM, Sonic909 said: On any road car : don’t use poly bushes! 1 hour ago, Berni29 said: .... I filled the lower void in my standard engine mounts with 65 hardness poly, and now I get a nasty vibration at idle. I really do not like it. I am going to get some of the RS mounts off of Type911 and fit those. I have Porsche RS mounts on my 993 and I do not get any NVH from them at all. And the moral of the story is that Porsche make these various mounts the way they are for a reason. Alternatives may fit but also may have unwanted side effects. Link to comment Share on other sites More sharing options...
edc Posted October 9, 2020 Report Share Posted October 9, 2020 I'm surprised at the vibration. Mine have been on for a good few years and were around 85 shore. Only the side with the hydraulic fluid was covered. No noticeable extra vibration. Link to comment Share on other sites More sharing options...
Berni29 Posted October 9, 2020 Report Share Posted October 9, 2020 Hi guys Maybe its a different situation with the manual cars? Mine is a Tip. And it is just the lower void that I filled. Anyways, I hope its not the same after I fit the 993RS ones! All the best Berni Link to comment Share on other sites More sharing options...
Teo Fabi Posted October 10, 2020 Report Share Posted October 10, 2020 I filled the underside void of the gearbox mounts with 60 shore poly and had the front engine mount bush replaced with a Powerflex one. The original was badly split. Everything feels nice and taught and i would say it is a better drive. I have no noise or vibration issues. Link to comment Share on other sites More sharing options...
JS1500 Posted October 10, 2020 Report Share Posted October 10, 2020 I swapped to replica 993 RS mounts on my 996 and it worked a treat, just as the OP states. Link to comment Share on other sites More sharing options...
Ninesomething Posted October 10, 2020 Report Share Posted October 10, 2020 On 2/16/2019 at 12:17 AM, Sonic909 said: On any road car : don’t use poly bushes! I poly'ed every available bush on my Subaru with either whiteline or powerflex. The car was pretty hardcore anyway so didn't exactly demonstrate limo ride quality but I never really noticed any significant vibes from polying ( is that a word?). On the plus side it was super positive, held alignment well and once aligned properly wore tyres totally evenly. Even the engine and gearbox mounts didn't add any vibes. Link to comment Share on other sites More sharing options...
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