3RsInCarrera

There doesn't seem to be much specific information concerning the differences between the internals of a base 911 992 engine and that in an S.

I know the turbos are bigger in the S.

Is that, in conjunction with the tune, the only difference in the two engines?

Several articles I've read and reviews I've seen on YouTube say the engines are the same, but some of those sources have also said other engines in other makes/models are the same, but they're not (forged vs cast internals, different injectors, etc). Reviews of the 2020 Toyota Supra stating its engine is the same as the BMW Z4 come to mind specifically. The engines are from the same family but have significant differences. The 2021 Supra does appear to have the identical engine as the Z4, but not the 2020.

Just curious and thinking ahead to tuning and longevity potential.

kayjh

Lots of experts on these forums. My attitude when buying a $120,000 car: If you want to go faster, get the S versions and don't worry about what is inside? Its got more HP and Torque and goes faster. And, if it blows up, you just drop off the keys and they fix it. If you tune it and it has a problem that PCNA won't cover, how much did you really save?

dhirm5

It might just be the tune. The bigger turbos on 991.2 come only with GTS and the power kit.

detansinn

If you don't have the money for a 992 S, you don't have the money to cover the cost of something going wrong with a tune on the Base.
The S is cheaper and lower risk by comparison, plus you get bigger brakes and performance options.

Sure, you may have put a tune on your Nissan, Subaru, etc, but when you break something in that Porsche engine bay, the costs are like the full purchase price of any of those cars. If you have that kind of cash lying around, you just buy an S in the first place and you're done.

detansinn

Compared to the Base, the S cars have bigger turbos and I wouldn't be surprised if they had other changes with the fuel injection, etc.

3RsInCarrera

That's precisely my question. Specifically, what are the engine differences between the two? There is alot more data available about other manufacturers' engines and the differences between versions and variants than there seems to be concerning Porsche engines it seems. Maybe I just don't know where to look. There was a great article on here about the differences between the 991 motor and the 992 motor. Just curious about the base and S is all.

msile

To answer the question that you asked......I am not sure that anyone knows yet. If they do, hopefully, they will chime in. I too did quite a bit of research and didn't see much. Once more tuners get their hands on these cars there will be more information.

detansinn

The bigger turbos have been confirmed by various outlets. I am presuming bigger injectors, rails, and pump, because if you're putting more air into the engine with bigger turbos, you need more fuel to take advantage of that. It's a 64HP/17% increase in power output with the S models -- to produce that kind of increment reliably, it's more than just a tune.

Given that it's Porsche that we're talking about, I am sure that they tweaked a whole bunch of stuff, even if the shortblock is identical. Unless some tech wants to speak up, we're not going to know for sure until more people start tearing them down.

msile

On the 996 Turbo, a tune and exhaust alone made 75-100 Hp reliably. May not be the same for the 992 though.

JCWLS3

Recently drove a rare lot-queen 992 7MT Carrera S at a dealership that was foreign to us. The SA who helped us was a 10-year Porsche pro who seemed very technically adept and knowledgeable. His dealership offers a full tune package for all 991s and 992s that does not invalidate the factory warranty. So he says.

Anyway, my point is not about the tune. I asked him if he knew any specific differences between the base 992 and S, engine-wise. He piped up immediately and said, "Well, the biggest difference is the base car has a single, larger turbocharger. The S has smaller twins."

After I picked my jaw up off the floor, I asked him if I heard right. I did. He swore up and down that was the case.

Can anybody confirm this?

msile

Stay away from this SA.
2,981 cc (3.0 L) twin-turbocharged flat-six (380 hp) at 6,500 rpm (332 lb⋅ft) at 1,950–5,000 rpm

JCWLS3

Thank you. There's a reason we didn't buy our Cayenne Turbo from this dealer.

rk-d

You know what's really sad -- these guys don't have to learn much. There isn't that much data they need to actually study. And yet, time and time again, so many of these guys know less than people who don't do this for a living. The laziness is what bothers me.

Both cars have twin turbocharged engines. Same with the 991.2 before it.

And anyone who says their tune won't potentially affect warranty is full of it. Even if the dealer guarantees to eat the cost of non-covered repairs, your car still gets flagged if Porsche AG finds out and you're then living on the good graces of your dealer for powertrain issues. With any mods - you have to pay to play and be prepared to cut a check If it all goes to hell.

spdracerut

On the 991.2, the Base, S, and GTS all have different sized turbos.

spdracerut

With modern direct injection systems, there's typically enough headroom to cover quite a wide spread of power. For example, APR started off with the 991.2 Carrera T which shares the same engine as the Base, bolted on GTS turbos and a couple other supporting mods and made 625whp using E85 on the stock fuel system. So about 260 crank hp more than stock.