R_Rated

good call Bruce. Let's also clean up the rediculous comments, engineering proclamations and power claims that are equally as silly.

fast and furious quotes are equally legitimate documentation to the other data provided. No before and after on a real car.... no valid boost increase data.... no valid data other than " it sure feels fast and I'm an engineer so I know stuff..."

Jenner

Why do you feel the need to resort to making fun of my name? Are you stuck in 4th grade?

Not a rennlist member and don't post with your real name...do you just troll?

R_Rated

Don't take yourself too seriously. R_Rated is my real name... what's wrong with that? I brought up some legitimate concerns and others echoed similar concerns. Having an opposing point of view is not trolling.

Dewinator

Many on this forum view any disagreement about car preference to be personal attacks.

"I prefer the painted washer nubs/other engine/seats/wheels/sunroof delete/whatever" "No it's your mother that's the prostitute!"

J.Ho

I think you answered your own question

Ira Blumberg

Good point. The dyno plot shows that Porsche tuned the car to have "fairly" linear torque from about 3,000 RPMs. There is a small bump at 3,000, but thereafter, the torque stays relatively flat up to high revs. This helps give the engine a linear feel.


The tune clearly exaggerates the torque bump at 3,000. This will not introduce any lag, but it will make the car feel less linear. The upside is it will also make the car significantly faster (and it will feel faster, but somewhat more difficult to modulate).


Torque "management" is very common in modern performance cars. This is an area where tuners can unlock significant gains, but there are trade-offs. I personally don't mind losing a bit of linearity for substantial power increases.


In any case, that is what the dyno plot reveals here.

sticky

Anyone who has driven the car knows there is lag. However, the spool is very good for a motor this size and the torque curve is fairly linear.

All the tune does is give you a hell of a lot more torque a hell of a lot faster. The spool is the same there just is a much meatier curve starting at 3k rpm.

Not sure what people want or what they are expecting. The motor is showing awesome gains with just an early tune.

Ed911.2

I think Ira has it right. I’ve done just over 1,000 miles now in my .2 GTS and when you’re on it, it doesn’t feel or sound like a typical “turbo” car, because of that consistent linearity.

Porsche could have gone for maximum boost from minimum rpm and made a faster car in pure numbers but it would have had a different character, more like the “overboost” on a TTS. I’m enjoying the balance between good torque at low rpm and needing the revs to make it really go.

My tuned daily has >700Nm at <2,000rpm which is great for relaxed driving at 6/10ths but makes higher revs a bit of an anticlimax.

If a tune on the GTS could just redraw the curve a little steeper without creating a “torque bulge” lower down, I think it would be worthwhile, otherwise why not just get the TTS and be done with it...?

sticky

To answer your question the TTS is almost another $100k. Why not just throw on a tune and pocket the change? I did. I'll upgrade the turbos too.

Like anyone can even tell the difference between 911 models (other than enthusiasts).

With the turbo motors getting more power is easy. I can't wait to experience this tune myself.

Dewinator

That makes some sense to me. I just don't really believe in a free lunch, so I think there's generally a reason why Porsche decided to build the engine the way they did (and did a great job according to every reviewer), whether it was for linearity, minimizing turbo lag, or longevity.

If longevity were indeed the reason Porsche didn't put more boost in, it might be unfortunate to be a preowned buyer and have the engine fail far sooner than it's designed to because the previous owner tuned it knowing they were only keeping it for a short time, and then removed the tune before selling it off and letting that buyer pay for their "free lunch".

sticky

The longevity argument is not much of an argument. The 9A2B6 motors all share the same internals.

How do those same internals go to handling 450+ hp in the GTS from the 370 hp in the Carrera?

A good tune isn't going to hurt anything. We'll see these cars making 700+ on the stock internals eventually.

Dewinator

Hmm that's a good point.

At 700 or more maybe it'd begin to become a player though? I suspect only a Porsche engineer, or time, could really tell us for sure.

Dewinator

Thingy from vehicular amusement park ride.

9914s

^^ that's not a bad trap speed.

sticky

That' a GTS? Not bad.

To put it in perspective, the 991.2 Carrera is now quicker and faster than the 991.1 GTS.