Easy2speed

I'm looking to pick up a .2 turbo or turbo s and tune it, but I can't find a definitive answer as to whether there is a power difference once tuned.

99Gdzra

I'd say yes, there's a difference. I have an 2011 TTS and it is a pretty impressive car for what few mods I have done to it. Europipe, AMS I/C's and tune... makes 546AWHP and 636 torque to the tires! I think anything you do to a Turbo the Turbo S will respond more favorably. Just my opinion, but I think I'm fairly close to accurate.

caslca

In my research, I came to the conclusion that 2011- USA models do not differ at all mechanically in the engine/turbo/diffs/transmission dept. The S is basically the regular turbo with all options ticked so you get the bulk discount and a nice S .

Interesting thread here talks about the 2010 being different; not sure if they were talking about non-US models since they came out earlier
http://www.6speedonline.com/forums/9...ference-3.html

99Gdzra

Not trying to be argumentative, but it's my understanding that the "S" got better internals... such as a fully forged motor, stronger pdk, and stronger half shafts. I know for sure there's more boost at the factory setting in the "S" which is where the bump in horsepower comes from.

550bryan

I on the other hand have been under the impression that the mechanical differences between the two come down to tune, everything else is the same. If true it would seem that a tune done to both versions would get you to the same place. Be interested to know which version is correct.

Dodaleca

I always thought it just a slight tune as the TT has the same torque midrange as the TTS when SC overboost used (just not carried up to the horsepower peak rpm and not permanently engaged).

saabin

Correct.

For example, go spec a replacement engine for a turbo, and then do the same for a turbo s. Same part number.

Ruskiy

Even better question, could we get our hands on the TurboS tune? How perfect would that be? To keep it Porsche spec and yet have a small power bump.

Kevin

Engine package/internal are the same. The "S" package has PDK TCU features that I would pay extra for.

99Gdzra

Good thread. I like to learn something about a car I know very little about.. I came from an C7 Corvette, knew that platform pretty well, and learning this one. When I was looking for my car, I sought out the TTS because I was told it had forged internals as opposed to TT's weaker rods and Pistons.

Shows, you can't believe half of what you hear.... I'm completely happy with my TTS though. Wouldn't have any other car... except maybe a new 991.2 TTS. 😬

caslca

FWIW, all official literature (including my manual) state that my TT makes exact same torque/HP as the TTS, and have the exact same RPM effectiveness when I push the sport button. It's just that mine lasts for 20seconds, which should just about cover any launches other than manned missions to the Moon.

I very much doubt Porsche would deal with two separate part lines for the benefit of 30HP...

Ruskiy

Does your documentation list the duration of boost increase in SPORT mode for the TurboS models? Does it say something along the lines of:
"Overboost briefly increases engine boost pressure by approx. 3psi (0.2 bar) in the engine speed range from 2000 rpm to approx. 4500rpm."

SamboTT@ByDesign

Hey D! Hope all is well! There is a myth out there about the cyl head heaving some different things about it but not sure. For example on the 991TT parts in the PDK use different bolts but the parts are the same. Porsche mysteries. I can tell you we get the 997.2 TT and 991 TT to the same point as the S. Or 1/2 mile record 991 and the first in the 9's in the US was a non S! Your limit will be fuel and PDK.

therock88

I posted on 6Speed as well in response. Here are the actual/factual differences relative to the engine only. I am aware that the S comes standard with items that are optional for the non S. Right from Porsche...no conjecture.

DC

Right from the Porsche Archives...

" As a result, the 3.8-litre flat-six
engine now comes in two power
levels.
The 911 Turbo models generate
368 kW (500 hp) between
6,000 rpm and 6,500 rpm
and 650 Nm of torque between
1,950 rpm and 5,000 rpm
(700 Nm for a temporary period
with the ‘overboost’ of the optional
Sport Chrono Package Turbo with
dynamic engine mount system).

In the 911 Turbo S models, a
modified valve control system
and an adaptation of the engine
management, combined with an
increase in maximum boost pressure
by around 0.2 bar, enable
the power unit to produce 390 kW
(530 hp) between 6,250 rpm
and 6,750 rpm and generate a
permanently high torque of
700 Nm between 2,100 rpm and
4,250 rpm to deliver even more
power to the road. "

Southpaw

^^ What he said.

I spoke with Cobb this morning and they confirmed the 30 HP difference is in the stock tune. An aftermarket tune will override that stock tune and both the TT and TTS will end up with the same HP.
This is why aftermarket tunes and parts are all the same for the TT or TTS.

Internals are also predominantly the same.

With the "S", you're paying for things like dynamic engine mounts, centerlock wheels, PCCB, torque vectoring....all of which can also be optioned on a turbo.