-nick

Anyone know what makes the gt3 mounts different? They appear to be physically identical. Are they a click stiffer? There is a pressure sensor inside the mount too, but I wouldn’t expect that would be any different?

Part number / revisions
GT3 R/RS 2017-2019: 991.375.059.86
GT3 A175/A176 engines: 991.375.059.81/84/85
991.1 Carrera: 991.376.059.06/07/08/09

Otherwise known as active mounts, dynamic mounts, PADM, PDEM, magnetorheological…

Thanks!

asellus

For the 991.2 at least, it probably has something to do with the engine being a 4 litre N/A vs 3 litre turbo.

In the 991.1 isn't it a 3.0 versus a 3.8? And aren't the S trims also 3.8s? Are your "regular" part numbers for the base or S?

-nick

Thanks asellus, I edited the part number info above. Those are the 991.1 and GT3 numbers. I could see a change in the rubber portion of the mount associated with the different engine weights. Maybe that is the only the difference.

The bottom half of the mount is just a stud suspended by rubber. The top half of the mount is the fluid and electromagnet with "port" holes for the fluid to flow through. With a current, the fluid (iron and oil slurry) thickens, can't quickly move through the port holes, and the mount stiffens. A pretty simple arrangement. I have a used "throwing a code" mount that I've been dissecting but haven't been able to make it turn "on". Giving +5V to pin 3, and ground to pin 5, isn't doing the trick even though it pulls about 1.5 amps as expected.

asellus

I can only guess, but it would stand to reason the difference is in the rubber thickness/hardness and/or the size or number of flow holes for the fluid.