STG

Turbo is on the way for all 911's except the GT3RS.

Summary of current news:

http://www.worldcarfans.com/11501198...rbo-except-gt3

So the 911 will retain a flat 6. Turbo charged 3.4?

cretinx

I would look for displacements in the 500cc/cylinder, plus boost - this is the most efficient sizing with current technology.

Look for less revs, longer stroke.

BMW is getting 300-350 out of their 3 liters with relatively low pressure. I would imagine Porsche would either go with larger turbochargers or more boost to maintain current power outputs.

But don't necessarily count on maintaing current power outputs - by losing weight they can actually reduce power and improve performance (look what Mazda has done in the last few years with SkyActiv - every model has lost at least 100 lbs without the use of exotic materials).

mtbscott

I have had a number of cars with "low pressure turbos" and they're wonderful. Solid wall of torque from as low as 1500 rpms up, good gas mileage, it's almost like just having a bigger engine.
My most recent experiences are with 5 modern turbocharged MINI's, and an Audi A3 2.0T circa 2006. I also had a TT-RS but I don't think its 2.5 litre 5 cylinder with 360hp was considered low pressure.
My guess is Porsche will follow their longtime habits with horsepower, i.e. minimal increments during each update, but the engines will get more torque and better gas mileage. The only drawback is sometimes turbo engines lose some of their exhaust note.

STG

Boy am I happy to be sitting on a 991S NA engine!

STG

Correction:

Turbo engines always lose exhaust note and high revs.

cretinx

and no matter how small lag is, there's still lag.

And you lose some of the ability to modulate power in fine increments.

STG

Unfortunately most cross shoppers only see HP and 0-60. That's what unfortunately drives mass production sales.

To them "turbo" sounds cool.

Tcc1999

Don't want to go too off topic (and boy could we!) just want to say, "Right you are".

STG

^^^^ Tcc1999 - Thanks for posting above.

I missed the above post. Chuckster, one of your best of 2015.

GrantG

The turbocharged McLarens rev to 8,500 rpm. Hatz has said that the new turbocharged 911's will keep their high revs. Of course, I am grateful that the GT3 will remain NA - it's important to have a choice.

Loss of throttle response and sound character seems inevitable with turbos. It's just that some are better than others - I would expect Porsches to be among the best in this realm.

But, I'm voting with my own dollars (waiting to buy a normally aspirated, manually shifted Cayman GT4 this year).

STG

GT4 will be great.

Now word is even the GT3 will go turbo with only the GT3RS and GT4 remaining NA.

mtbscott

My car before my 991 was an Audi TT-RS. Turbocharged 2.5L five cylinder rated from the factory at 360hp/343ft/lbs of torque, and virtually everyone who ever dyno tested one said they were more in the 375hp range.
It came standard with an electronically controlled exhaust like the 991's optional one, and it was....well....pretty loud. And the tone that came out was the same growling shriek that came out of Audi's 80's rally cars with 5pots.
So like you say, it can be done, it can still maintain much of its exhaust aurals.

chuckbdc

Not in my experience. You only need hear a current Turbo S with an afternmarket exhaust to understand how much the sound you now love from your NA 911 is a product of purposeful engineering rather than some act of nature. And apart from the sound, it will rip your head off while you are craining your neck to feel the lag.

Time to face it. For Porsche to retain market share in the face of Jag, Merc and Corvette marketing, it will need a great deal more torque per $.

PS My 991 C2S is in every way the best 911 of the 4 (including 3 air cooled) that I have owned since 1974. But I have little doubt that the 991.2 C2S or GTS or whatever is marketed as the ultimate "dual use 911" will be better yet.

chuck911

Alas, poor Cup Car, I knew him, worldcarfans. Did you? Either worldcarfans doesn't, or Porsche quit making Cup Cars, or they're gonna turbo the Cup. I'm kinda thinking the writer simply forgot about the Cup.

Anyway, can you imagine the feeding frenzy gonna churn the automotive waters when the GT3 RS comes out? Not only will it be the last NA street 911, but by then everyone will be convinced it will be the last of the NA GT3 RS's. And there's already chum in the water. Gentlemen, we're gonna need a bigger boat!

STG

The GT3RS will remain NA in the future from what has been quoted. Low production numbers won't kill it off.

The GT3 looks like it will be turbo in the next version. The current 991 GT3 2014/15 will be a keeper.