As all three cars have the same base 3liters - Is the only real difference in the three motors turbo size and boost pressure? Or are there other differences in the internals?

 

 

Besides the bigger turbos and revised PCM software, assuming it has PSE, my recollection is the X51 Power Kit to convert the S engine to GTS spec also includes a different PCV valve and brake cooling ducts.
All of this is not saying that everything on the base is the same as on the S and GTS.

 

Do the letters on the rear bumper count?

 

I'll need to do some research, but I'm curious if any of the internals are meaningfully different from base to GTS. These new turbo motors offer fascinating potential and to me it's even more facinating if these motors are the same other than turbo's and obviously tune. Bore, stroke, intake valves, exhaust valves are the same. Just curious what the differences are.

 

I *think* that's correct - meaning the turbo chargers and the ECU are the main differences between the engines and all other core mechanical components are the same. In other words, the engines are built to handle more than what they are delivered with from the factory. I'm not 100% certain though, so would be good if someone with deeper mechanical knowledge could chime in.

 

Scanning through the 2017 Service Information Technik Introduction manual, there are no core engine differences called out, beyond the turbos, the exhaust, and the tune.

Oddly enough, that manual says that 2017 Carrera S PDKs come with a center radiator, but someone must have changed their mind on that since mine does not.

 

Looking at part numbers on Suncoast, it appears the radiators are the same on the Base as for the S and GTS.

 

Same engine in all three... Makes the base 991.2 a modders dream.

 

Thats my thinking ... I love my T as it is, but knowing the motor was built to do so much more makes the 991.2 platform a really great one for mods no matter what model you start with. Very interesting.

Thanks
Jeff

 

Just FYI, here's a little more detail on the difference in the turbos between the base, the S, and the GTS

9A2 3.0 991.2 Carrera
Turbos: 49mm compressor/45mm turbine

9A2 3.0 991.2 Carrera S
Turbos: 51mm compressor/45mm turbine

9A2 3.0 991.2 Carrera GTS
Turbos: 55mm compressor/48mm turbine

And this quote: "...the engines are effectively all the same thing. Porsche is sharing parts and cutting costs. The only real difference is the turbocharger sizes, boost pressure, and tuning"

Info pulled from this article: https://www.************.com/content...ocharger-sizes

 

While were on differences, thoughts on brakes?

991.2 Base has 330mm 4-piston front and rear (same as 997 generation S)
991.2 S has 350mm 6-piston front, 330mm 4-piston rear. (same as 997 generationTurbo)

Has anyone found the 4-pot 330's lacking in any situations other than perhaps sticky-tire track days? And for those your likely upgrading rotors and pads regardless of the 330 4 pot vs. 350 6 pot fronts.

Other than cool red calipers, could a mere mortal feel the difference between the base and S brakes on aggressively driven but public roads?

Disclaimer: Clearly I have a hidden agenda, convincing myself that a 991.2 base with a few minor tweaks won't leave me missing my current 996 Turbo very much if I do the swap! ;-)

 

If you overheat the base brakes on a public road, I'd hate to think what the heck your doing. Absolutely strong and responsive brakes on the base. Go for a test drive and let us know how you feel about either one.

 

.2 C has same rotor diameter as .1 S, but thicker rear brakes.



More than enough brakes for me for a non-tracked car.

 

Sure, just stroll in and ask: "Hey, can I take out a 991.2 Carrera for a few hours? I'd like to see if I can push the brakes to fade or failure..."