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It could very well be a 3.62. My "research" was very rudimentary and only involved gunning the engine and looking down at the speedometer. All I knew was that it sure wasn't a 3.25 final drive. The only other documented ratio at the time was 3.89 so I just assumed it was that but what you said makes a lot of sense.
If the final drive has been 3.62 for both the 981 and 718 PDK iterations I kind of doubt they would put in the time and resources to change this in the 718 4.0/GT4.
One hope is that the redline (and shift point) of all 981 variants was actually 7600 RPM, not 7800 RPM. The rev limiter was at 7800 RPM, just as it is at 8100 RPM on the 718 GT4. The shift point for the 4.0L engine in the GT4/Spyder will be 400 RPM higher than the 981, and 500 RPM higher than the 718/982 four cylinder models, so shorter gearing would make sense. Also, the 718 GT4 Clubsport has a different final drive ratio than the regular 718 (3.724 instead of 3.62), again suggesting changes are feasible. Anyway, I have hopes, but maybe we'll be disappointed and just get the same PDK as before.
Also, note that the PDK for the GTS 4.0 is more expensive than PDK for regular 718 models. This might be just marketing setting the price they can get away with, but when combined with extra development time for PDK, and Walliser’s comments, I still believe there’s a good chance the PDK for the 4.0L models will be mechanically different and have shorter gearing.
I updated the spreadsheet to reflect the 981 redline being 7600 rather than 7800, found more precise gear ratio numbers for the PDK, and added some rows for the 981 GT4 since it was geared differently from the 981 S/GTS. Spreadsheet download link: https://drive.google.com/file/d/13bO...ew?usp=sharing
Also, note that the PDK for the GTS 4.0 is more expensive than PDK for regular 718 models. This might be just marketing setting the price they can get away with, but when combined with extra development time for PDK, and Walliser’s comments, I still believe there’s a good chance the PDK for the 4.0L models will be mechanically different and have shorter gearing.
I’m with you. I really hope Porsche is developing a new PDK system for the 5 new NA 718 models with PDK. Just lower gearing would be a big improvement.
PDK-S for the GT4RS, and hopefully for GT4/Spyder would be very welcome!!!
will do, my bad ... ideally it would be good to be able to shift up each car's max torque rpm ... and to the bottom end of their "max" torque, e.g on the GT4/Spyder low would be 4k high would be 6.8k (I think)
Thanks for doing this. According to this graph, the shift from 1st to 2nd at redline will drop the rpms from 9000 to 5712 but after watching a few 0-200 km/hr pulls, it looks like the it drops to 6200. Or am I reading the graph wrong?
Appreciate the response. So the individual gears are shorter. I saw it said 7th was, didn’t know it was all of them. A 3.89 swap on the pdk would be interesting then.
Appreciate the response. So the individual gears are shorter. I saw it said 7th was, didn’t know it was all of them. A 3.89 swap on the pdk would be interesting then.
The numbers in parens below are the individual gear x final ratio. The shorter 7th gear in PDK is as compared to non-4.0L cars.
I can tell you that the PDK in the GT cars is a "turn it to 11" experience -- very telepathic.
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.
In addition, the PDK versions of the 718 Spyder and 718 Cayman GT4 benefit from the enhancements made to their mechanical locking rear differential: in traction and overrun modes, this achieves locking values of 30 and 37 per cent as compared with 22 and 27 per cent with the manual transmission. This has a positive effect on the longitudinal and lateral dynamics as well as traction, and increases driving pleasure.
To realize what a huge improvement this is, consider the speed in gears at only 8k rpm (where the other GT4 PDK has to shift). Basically, just reduce the speeds above by 11%...
Also looks like video shows 2nd gear topping out at about 105kph (65mph) at 9k (would be 58mph at 8k rpm)
Also looks like 7th is geared for about 199mph at 9k (likely drag limited a bit below). For comparison, GT3 is geared much higher (225mph in Manual 6th and higher in PDK 7th).
07-03-2020, 09:15 PM
