The black turbo compressor inlet tube connects to the turbo with a clamp and it uses some accordion tubing to allow for engine movement relative to the air filters. The filters are somewhere in the rear fender area. They are near the end of the accordion section which removes a couple feet of ducting compared to the 991.2 which will improve performance. I’m guessing the air going to the filters is from the same area as the air for the intercoolers; basically, that air slot that you can see with the rear cover up. Fastened to the compressor housing is a new electric wastegate actuator replacing the old pneumatic one. In the left of the picture, you can just see the ride height sensor.
Hidden under the heat shielding is the new cast log manifold replacing the old double-wall stamped and welded 991.2 manifold. It’s an improvement on the 991.2 design which had the flows crashing into each other, but there’s still a lot of room from improvement. In the upper right, you can see the wastegate actuator. It looks like the actuator rod is hidden under even more heat shielding.
Heat shielding everywhere. This view gives you a better idea of the L-shape of the log manifold. The cat design is completely different from the 991.2 generation with only a single outlet. It seems the valve which controls exhaust flow between normal and sport modes is now located inside the muffler. As for that little cylinder next to the cat with rod going through it? It’s a fancy exhaust hanger I think.
The cat just has a single big pipe going to the muffler. Notice the new heat shield between the muffler and the engine. The 991.2 generation water pump which sits near the muffler has a bad habit of leaking. I’m wondering if Porsche figured out it’s due to heat from the muffler, hence the new heat shield. Of note, the cars in Europe will likely have a different cat setup because they will also have a particulate filter which is not currently required in the US market.
Just another view of the shiny new muffler and the heat shield behind it.
Thanks Blake, much appreciated! For us guys who like to modify our cars in our garages, lots of lessons to be learned from the OEMs. And now with Porsche being almost all turbo, lots of lessons for those slapping turbos on there rides. Lots of aero tricks too for the track and time attack crowd.
Exactly Khiem, I always follow the OEMs, especially when they track their cars. They spend millions and we get to reap the rewards. A patient engineer is a good engineer. Why do the heavy lifting, if you don’t have to?
BTW, there’s a reason the mechanics in F1 religiously guard their cards. As soon as an engineer sees the goods, it’s practically over. Reverse engineering isn’t as hard as it looks.
Surprised to not seeing the adoption of electronic wastegates in the aftermarket community (having so many people so obsessed with turbos and all)… No real advantage or is really cost the factor?
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Always thoroughly enjoy a look at these new performance cars through your eyes Khiem. Keep them coming!
Thanks Blake, much appreciated! For us guys who like to modify our cars in our garages, lots of lessons to be learned from the OEMs. And now with Porsche being almost all turbo, lots of lessons for those slapping turbos on there rides. Lots of aero tricks too for the track and time attack crowd.
Indeed, currently planning some underbody aero for my project and thinking to replicate the turning vanes as seen on the McLaren and GT2 here.
Exactly Khiem, I always follow the OEMs, especially when they track their cars. They spend millions and we get to reap the rewards. A patient engineer is a good engineer. Why do the heavy lifting, if you don’t have to?
BTW, there’s a reason the mechanics in F1 religiously guard their cards. As soon as an engineer sees the goods, it’s practically over. Reverse engineering isn’t as hard as it looks.
Nice article!
Surprised to not seeing the adoption of electronic wastegates in the aftermarket community (having so many people so obsessed with turbos and all)… No real advantage or is really cost the factor?
Thanks!
Well, I think becauseof two main issues: how to control and also many people go with external wastegates.