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991.1 C4S to 991.2 Turbo S

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Old 11-13-2023 | 11:03 PM
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Default 991.1 C4S to 991.2 Turbo S

I’ve owned a 2014 C4S in 7 speed manual for about 2 years, which I daily drive throughout the snowy winter in Montana. Was considering moving to a 991.2 turbo S in the next year or so. Has anyone else made a similar move? I think I might miss the sound and manual transmission on the C4S, but the extra performance and gravitas of the turbo will probably more than make up for it.
Old 11-13-2023 | 11:23 PM
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Originally Posted by Drspeedy
I’ve owned a 2014 C4S in 7 speed manual for about 2 years, which I daily drive throughout the snowy winter in Montana. Was considering moving to a 991.2 turbo S in the next year or so. Has anyone else made a similar move? I think I might miss the sound and manual transmission on the C4S, but the extra performance and gravitas of the turbo will probably more than make up for it.
Do it, you won’t miss it, I don’t!
Old 11-14-2023 | 12:24 PM
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Both of my 911s prior to my 991 TTS had a manual transmission. While there are some rare times when I miss the manual transmission, the 991 TTS is so good that it quickly makes me forget about shifting gears the old-fashioned way. I typically drive my car in manual mode and use the paddle shifters, but it’s nice to have the option to let the car shift in some situations. You won’t miss the manual.
Old 11-14-2023 | 03:25 PM
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I too am a manual transmission die-hard, and I've never been satisfied with the "paddle-shift" experience in other sports cars. The 991.1 TTS I purchased 6 months ago is the first sports car I've owned where everything else is so amazing that it makes up for the lack of the manual transmission.

I do have an MX-5 ND2 Club, which I will never sell, and that provides me with my manual transmission fix.
Old 11-15-2023 | 11:08 AM
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I went from a 996 C4S Tip to a 991.1 C2 PDK and now to a 991.2 TT, and obviously PDK there too.

Do it, do it, DO IT! Also, once your car warms up and ticks over, once it hits that magic 194 number in your fluids readout, swap that manettino dial to Sport and your life will change lol.
Coming from a Gen 1 991 like I did, you will immediately see the difference, especially with it being a new engine on the .2 TT/TS cars.

I actually use my console shifter a lot (and it goes the 'right' way, with down being up a gear and forward being down a gear, like in the GT cars), as I'm a big fan of endurance racing so I always loved those sequential shifters in the Le Mans, etc. cars. The paddles are also really fun. And, in Sport+ mode, once you hit the track, it does it all for you and you're just focused on lowering lap times. It's truly magical, and I don't see how I'll own another model besides a TT or TS in the future.
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Old 11-15-2023 | 01:11 PM
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Originally Posted by RSBro
I went from a 996 C4S Tip to a 991.1 C2 PDK and now to a 991.2 TT, and obviously PDK there too.

Do it, do it, DO IT! Also, once your car warms up and ticks over, once it hits that magic 194 number in your fluids readout, swap that manettino dial to Sport and your life will change lol.
Coming from a Gen 1 991 like I did, you will immediately see the difference, especially with it being a new engine on the .2 TT/TS cars.

I actually use my console shifter a lot (and it goes the 'right' way, with down being up a gear and forward being down a gear, like in the GT cars), as I'm a big fan of endurance racing so I always loved those sequential shifters in the Le Mans, etc. cars. The paddles are also really fun. And, in Sport+ mode, once you hit the track, it does it all for you and you're just focused on lowering lap times. It's truly magical, and I don't see how I'll own another model besides a TT or TS in the future.
The 991.1 and .2 Turbo and Turbo S engines are basically the same. The .2 has slightly larger turbos, and there are creature comfort upgrades. This info comes from Mike Levitas, owner of TPC Racing (from Rolex 24 winner in Porsche), which specializes in preparing Porsche GT3 racing cars for IMSA and other series. They also do a lot of performance upgrades for street Porsches.

Mike owns a 991.1 TS, and he agreed to look over my car. He stated emphatically that Porsche over-engineers the first engine iteration of a model, then gradually upgrades the power over a gen run, like the .2 changes, for substantial prices increases. He said there's nothing about a 991.2 engine that a 991.1 engine can't handle with equal performance and beyond.

He said the same is true of the 992 TS gen with generally the same engines as the 991 TS, only slightly less displacement (3.7 vs. 3.8), increased boost and more intercooler performance to handle the extra turbo boost.

His bottom line was that both the 991.1 and .2 engines have a lot of potential to handle significantly more power, and Porsche just continues to unlock just a little bit more in subsequent years, and, of course, charge for it.

Last edited by Foosh; 11-15-2023 at 01:19 PM.
Old 11-15-2023 | 01:33 PM
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Originally Posted by Foosh
The 991.1 and .2 Turbo and Turbo S engines are basically the same. The .2 has slightly larger turbos, and there are creature comfort upgrades. This info comes from Mike Levitas, owner of TPC Racing (from Rolex 24 winner in Porsche), which specializes in preparing Porsche GT3 racing cars for IMSA and other series. They also do a lot of performance upgrades for street Porsches.

Mike owns a 991.1 TS, and he agreed to look over my car. He stated emphatically that Porsche over-engineers the first engine iteration of a model, then gradually upgrades the power over a gen run, like the .2 changes, for substantial prices increases. He said there's nothing about a 991.2 engine that a 991.1 engine can't handle with equal performance and beyond.

He said the same is true of the 992 TS gen with generally the same engines as the 991 TS, only slightly less displacement (3.7 vs. 3.8), increased boost and more intercooler performance to handle the extra turbo boost.

His bottom line was that both the 991.1 and .2 engines have a lot of potential to handle significantly more power, and Porsche just continues to unlock just a little bit more in subsequent years, and, of course, charge for it.
I should've emphasized I more meant coming from a Carrera to the Turbo engine being such a huge difference, as it very much is!

Also, that's interesting to hear, as I've read through and had numerous discussions at the track and my local PCA FB Group about the .1 vs .2 engines in the TT/TS, and I thought the .2 models introduced the "VTT" where they have the 'quad turbo' setup, with the 2x smaller turbos continuously spooling, that then push air quicker to the 2x big turbos to reduce lag in the lower RPM range. Or was that included also on the .1 engine? I'd read that was the biggest difference, with, as you said, the 'facelift' changes in HP and TQ being modest, as usual. I'm not sure what else there is that differentiates the two. I'll be curious to see where they go with the 992.2 TT/TS engines.

I still am on the fence about doing a ByDesign tune, as I definitely want a Kline exhaust to make this thing sound halfway decent, and agreed, I know people with TT/TS' locally that run ByDesign and other mods that are dailying their cars and hitting high 700s, 800s, all day no problem. So they can absolutely handle the abuse!
Old 11-15-2023 | 03:06 PM
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Here’s a link to the Porsche press release that details the differences between the 991.1 and 991.2 TTS:

https://www.prnewswire.com/news-rele...300185579.html

Either generation of this car is excellent, although the .2 cars have a few nice updates. The changes to the bumpers and lights may be more appealing to you, but that’s obviously subjective. Many people really like the updated PCM in the .2 cars as well as the updated steering wheel.
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Old 11-15-2023 | 03:11 PM
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The additional fuel system in the 991.2 is a game changer if you are tuning, etc.
Old 11-15-2023 | 03:58 PM
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Originally Posted by Dennis C
Here’s a link to the Porsche press release that details the differences between the 991.1 and 991.2 TTS:

https://www.prnewswire.com/news-rele...300185579.html

Either generation of this car is excellent, although the .2 cars have a few nice updates. The changes to the bumpers and lights may be more appealing to you, but that’s obviously subjective. Many people really like the updated PCM in the .2 cars as well as the updated steering wheel.
The aesthetics of the .2 car, inside and out, were also a huge selling point for me. I was not in the market at all for a new 911, perfectly happy with my .1 C2, but then while having service done, my local dealership had my now-acquired .2 TT in stock, CPO, under 10k miles, and all the subtle stuff (plus a generous test drive) you mentioned made it irresistible to walk away from. PCM upgrade was also huge, although they deleted HD radio for some reason (my commute is short, so I listen to talk radio mostly, on the way to/from work) so I did use it in the prior PCM. New wheel also feels miles better, I'd planned to swap my .1 wheel for a .2 model, actually before trading up.
Old 11-15-2023 | 05:37 PM
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Yes, there are differences in tech, creature comforts, etc., but I was just pointing out that the 991.1, .2, or 992 for that matter all have the same basic engine, and with bolt-on modifications, putting out a lot more power than latest OEM TS gen.

Last edited by Foosh; 11-15-2023 at 05:45 PM.
Old 11-18-2023 | 12:26 PM
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Originally Posted by RSBro
…I thought the .2 models introduced the "VTT" where they have the 'quad turbo' setup, with the 2x smaller turbos continuously spooling, that then push air quicker to the 2x big turbos to reduce lag in the lower RPM range. Or was that included also on the .1 engine? …
Not understanding this… are you talking about VTG turbos?
Old 11-18-2023 | 12:33 PM
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Originally Posted by Pb Pedis
Not understanding this… are you talking about VTG turbos?
That’s the way that I read it, but I believe that feature was introduced on the 997 cars.
Old 11-18-2023 | 02:29 PM
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Will the ride quality be any different on the turbo s vs my c4s? I have the DSC controller in my 911 currently and plan to put it in a turbo.
Old 11-18-2023 | 03:50 PM
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Originally Posted by Drspeedy
Will the ride quality be any different on the turbo s vs my c4s? I have the DSC controller in my 911 currently and plan to put it in a turbo.
I can't comment on the C4S never having owned one, but the DSC is a huge upgrade in the 991.1 TS, as I recently installed one.

Unfortunately, the 991.1 and 991.2 versions are not compatible, but as I said in your other thread, call DSC Sport, and they might work something out for you.

Ride quality in Normal mode was greatly improved, and in Sport mode it's also less harsh.

One of the nice side benefits, is that minor rattles and squeaks on broken and rough pavement in my 2014 TS cabriolet that were present with the OEM controller, have disappeared with the DSC, which is an indication of the suspension staying more planted.

Last edited by Foosh; 11-18-2023 at 04:38 PM.
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