ipse dixit

In a PDK, the car would downshift in that situation, and in many instances people mistake that for "lag".

dflowerz

For sure flooring it at 2K rpm is not the way to go. No engine likes that except for maybe a tractor or a Harley

knasman

All (turbo, PDK, or NA rpm building) of them are lag in terms of "when do I get moving". And for all of them, the simple fix is to manually drop some gears

Happy911S

I don't understand the questioning about turbo lag - it is just physics.

Both the 991.1 or .2 should respond almost immediately to a throttle response change, however, the .1 will be linear and the .2 will respond some and then have a short lag before the turbo spools. This is the point the guy made in the video. So if you are driving a .1 at at constant speed/RPM and press the accelerator 20% more the response will be to change speed very quickly. If you do the same in a .2 the engine will respond very quickly because there will be more fuel going in, however, a short time later the increased exhaust gas from more fuel being burned will cause the turbo to increase in speed and increase the air manifold pressure which allow the controls to add even more fuel or increase the torque. This is the turbo lag.

You may not notice the lag but it is impossible not to have some. It may not bother you that it has a small lag and it may bother others.

You can get FI without the lag but this requires a supercharger and is not as fuel efficient as a turbo.

maxpowers

On another topic, he mentions the steering feel is better on the 991.2, but still not at the level of the 997. I saw Tiff Needell thought the steering on the 991.1 was pretty good at 1:29 so I was surprised to see Motortrend complain about it

Archimedes

You're confusing throttle response with outright power. The throttle response on the NA car will be immediate and linear, it will just take time to go faster because it doesn't have as much power in that rev range. The turbo will be the faster car because it has more torque at lower RPMs, but it will have a throttle response characterized by initial lag and then a harder hit. Porsche has done a great job disguising it, particularly at higher revs, but it's still there to some extent. It's simply a trade off for having more power and better economy. When I drove the .2, I could definitely tell it was FI, but it wasn't so bad that it would keep me from buying the car. Porsche has done about as good a job as I think you can do with a turbo.

awrryan

Wait a minute. The 991.2 is a turbo engine? Any lag? (Jk)

Selo

What I want to know is how the car feels compared to the GT4. Not how fast it is, but how it feels compared to the GT4. My GT4 is awesome, and I don't want to get rid of it anytime soon, but I definitely miss having a 911 convertible. I just wonder if the new 911 feels as special and as solid as the GT4. Anyone have any comparisons?

ggreg911

All I can say is, Id never trade my 17 C4S cab for any version of a Cayman and It feels more special than my old 15 GTS cab.

Archimedes

Apples to oranges comparison if there ever was one in the Porsche lineup. Totally different cars that will each feel special in very different ways.

If you love the GT4 but really want a convertible, I'd suggest trying to find one of last few Spyders still available on dealer floors. That's going to be much more comparable in feel and performance than your GT4.

M. Schneider

+1 ... Well said. "To each his own" ..

The MY17 Carrera PDK coupe** loaner car we drove for better part of 2 days was a hoot... So much so that I've looked over the "build" feature on the Porsche website; A severe case of cognitive dissidence?
The 3.0ltt coupes power output/availability at lower RPM grabbed my attention regardless of elevation. Either or at Denver's 5280ft or a substantially greater 8,400ft + elevation throughout the mountain towns. The base cars diminished turbo lag character is a respectable accomplishment. ... The thin air/pressure at 8,400ft elevation presents an ever-so-slight, kinda-sorta-maybe turbo lag character yet well within the definition of throttle linearity... Turbo lag with the new 3.0ltt is a bit of a ghost.... You're either a believer or not.

That said, the throttle response of a MY98 3.6l air/oil cooled Hans Mezger flat six is old sckol throttle character in spades..
Location elevation effects air pressure/density metrics, big time. A rule of thumb for a normally aspirated (N/A) engine is (neg.) -3% specific output for every 1,000ft elevation increase.. Using "rule of thumb" arithmetic a MY98 993 C2S coupe's 3.6l N/A specific output is down -24% or so at the driveway which is 8,400ft elevation. .. As for elevation effect and the MY17 911 3.0l twin turbo .... some effect on specific output - however not so much.



** Base model MY17 911 3.0ltt (370hp/331 Lb.-Ft.)

dflowerz

Turbo lag or not, my 991.2 C2s has very addictive power and with all the handling goodies I got the car is very impressive in the turns. Did a a few mile loop the other day with some good turns and blasts out of turns. Got in the driveway and noticed that burnt rubber smell coming from the rear tires. Guess I had the traction control working overtime. A huge smile followed!

M. Schneider

+1 ... I hear that. Huge smile!
The newer MY17 991.2 with twin turbo induction have my attention. ... Bring money.