Gt4 pdk here in 2 weeks.
Discussion
Indeed. I think the shorter ratio 'box of the 991.2 may come into play? I assume PDK and Manual gears 1-6 are very similar. More of a difference in the GT4 so a doubling of the gap in times could be right.
In the real world, with a mix of driver abilities and circuits/roads the difference is going to be pretty small. Buy the gearbox you like for what it is rather than what performance advantage you think it has
In the real world, with a mix of driver abilities and circuits/roads the difference is going to be pretty small. Buy the gearbox you like for what it is rather than what performance advantage you think it has
Twinfan said:
Indeed. I think the shorter ratio 'box of the 991.2 may come into play? I assume PDK and Manual gears 1-6 are very similar. More of a difference in the GT4 so a doubling of the gap in times could be right.
In the real world, with a mix of driver abilities and circuits/roads the difference is going to be pretty small. Buy the gearbox you like for what it is rather than what performance advantage you think it has
Sound advice for when the next person asks should they buy PDK or ManualIn the real world, with a mix of driver abilities and circuits/roads the difference is going to be pretty small. Buy the gearbox you like for what it is rather than what performance advantage you think it has
TDT said:
Twinfan said:
Thanks T
7-8 seconds sounds much more likely over a 7 minute lap
Still sounds like a lot though... and its all rumours - there is no official time.7-8 seconds sounds much more likely over a 7 minute lap
991.2 GT3 PDK is only 3 sec quicker that Manual GT3.
End of gear speeds are higher than previous gen for MT because of the raised rev limit.
Common practice is the US was to do a big engine conversion from a base 981 2.7 because this is actually a different ratio box.… this would likely have been revised for the new power output.
But goes to show Porsche have the parts right their on the shelf but actively chose not to use them for emissions and to maintain the product hierarchy.
I’m not sure all the numbers in that table are correct.
But something to have discussion around anyway.
Common practice is the US was to do a big engine conversion from a base 981 2.7 because this is actually a different ratio box.… this would likely have been revised for the new power output.
But goes to show Porsche have the parts right their on the shelf but actively chose not to use them for emissions and to maintain the product hierarchy.
I’m not sure all the numbers in that table are correct.
But something to have discussion around anyway.
Edited by TDT on Sunday 28th February 10:14
That's really interesting and if accurate means that the PDK GT4 has a high 7th gear the same as the 981 PDK, which I found really useful. You don't use 6th on track (generally) so being able to take it easy on a motorway on the way can be a bit of a relief. The 991.2 GT3 PDK didn't have such a high 7th, wonder what the ratio was in that.
TimRV57 said:
That does look broadly sensible, except for the 7th in the GT4 - didn’t the press release say that the GT4 and Spyder had a shorter 7th than on the existing PDK box?
Good spot, they do indeed and that table doesn't account for it.Bit of a moot point though really as it's a cruising gear so even if it's 50mph shorter it makes no performance difference. It'll hit top speed in sixth.
My 981 GTS PDK definitely didn’t to 85 mph in second on the Rev limiter it was somewhere in the low to mid 70s.
I also remember some blurb saying the PDK GT4 as not having the economy 7th gear. I agree it would be handy for the motorway getting to the Alps or just for cruising, will find out in a couple of weeks and try and calculate it in the running in period.
Wish they had a “track my order” thing it was apparently at the port 4 or 5 days ago!
I also remember some blurb saying the PDK GT4 as not having the economy 7th gear. I agree it would be handy for the motorway getting to the Alps or just for cruising, will find out in a couple of weeks and try and calculate it in the running in period.
Wish they had a “track my order” thing it was apparently at the port 4 or 5 days ago!
robj4 said:
That's really interesting and if accurate means that the PDK GT4 has a high 7th gear the same as the 981 PDK, which I found really useful. You don't use 6th on track (generally) so being able to take it easy on a motorway on the way can be a bit of a relief. The 991.2 GT3 PDK didn't have such a high 7th, wonder what the ratio was in that.
GT3 7th is around 25 mph/1,000 revs, as I recall 981 S PDK around 32 mph.Twinfan said:
I've just found this posted on Rennlist which looks much more accurate to me:
No! the original quote was correct. The issue is the Final Drive Ratio - quoted as 3.25 for the PDK - correct, I believe. HOWEVER there is clearly a step down in the PDK box - and hence the 718 box quotes an OVERALL ratio of 3.62. I KNOW my 981S PDK did about 70 in second and 100 in third (I checked it with GPS because it was obvious that the car wasn't pulling 40mph/1000 in 7th.The US folks used this calculator. If you know the correct gearing spec numbers pump them in and see what you speeds get...
https://www.tremec.com/calculadora.php
https://www.tremec.com/calculadora.php
TimRV57 said:
That does look broadly sensible, except for the 7th in the GT4 - didn’t the press release say that the GT4 and Spyder had a shorter 7th than on the existing PDK box?
IndeedIt is wrong and you are wright !
7th PDK is shorter than the 981 PDK
The official Porsche statement;
https://newsroom.porsche.com/en/2020/products/pors...
There from;
"In the flagship 718 Spyder and 718 Cayman GT4 models, the driving mode has a characteristic that’s typical of the GT variants: it can be programmed for maximum performance using the PDK Sport button. An automatic selector lever, which echoes the design in the 911 GT3, underlines the emotionally charged GT experience. The seventh gear of the PDK has a shorter ratio in all 718 four-litre naturally aspirated engine derivatives."
Edited by Romo on Sunday 28th February 17:37
Romo said:
The significant word is OVERAL transmission ratio - ie it's not the final drive ratio - but the final drive ratio x the constant dropdown ratio in the box. I'm surprized this is still being discussed - the fact that PDK is around 15% lower geared in the intermediates has been a fact (and accepted by most) for years.TDT said:
End of gear speeds are higher than previous gen for MT because of the raised rev limit.
Common practice is the US was to do a big engine conversion from a base 981 2.7 because this is actually a different ratio box.… this would likely have been revised for the new power output.
But goes to show Porsche have the parts right their on the shelf but actively chose not to use them for emissions and to maintain the product hierarchy.
I’m not sure all the numbers in that table are correct.
But something to have discussion around anyway.
Another reason for the 2.7 is that the PCNA exchange value for the 2.7 is more than for a 3.4. Also 2.7 is a cheaper base car to buy.Common practice is the US was to do a big engine conversion from a base 981 2.7 because this is actually a different ratio box.… this would likely have been revised for the new power output.
But goes to show Porsche have the parts right their on the shelf but actively chose not to use them for emissions and to maintain the product hierarchy.
I’m not sure all the numbers in that table are correct.
But something to have discussion around anyway.
Edited by TDT on Sunday 28th February 10:14
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