Riz

Does anyone know what the gear ratios will be for the Pdk in the GTS 4.0 and GT4 versus the taller 6 speed manual ratios? What will be the speed in gears for each transmission?

ExMB

See other posts on this subject matter.

Riz

I read a lot of stuff but just need a chart showing the speed in each gear comparing the 2 transmissions
Have not found it yet

Greg_STL

Based on the math I did for the gearing/final drive/tire size - For the GT4 motor at 8000 rpm (all in mph)

Also assuming same gearing on PDK as on Cayman S

Gear MT PDK
1 48.5 44.1
2 82.2 75.1
3 113.9 104.1
4 141.5 132.2
5 168.7 159.3
6 196.9 195.5 (Top Speed - Drag Limited ~ 188 mph)
7 N/A 279.1 (Overdrive in PDK - Top speed would be in sixth for both MT and PDK)

halfmonkey

To add to this, I did reach out to Porsche in early August and a manager from Product Communications responded with this. Note that it says top speed is expected in 7th gear so maybe that means gear ratios will be different so that 7th isn't an overdrive gear. Fingers crossed.

"Thank you for your e-mail, and your interest in Porsche. While I have no information on gear ratios on the 718 Spyder equipped with the optional PDK, it appears that the PDK on the GT version of 718 (GT4 and Spyder) will reach their top track speed in 7th gear, which is typical of past GT models such as the 911 GT3, GT3 RS and GT2 RS."

Riz

Thanks - definitely an improvement. If 7th is direct then even better. I wonder if the GT4 and the GTS 4.0 will have the same PDK.

jmartpr

If this is true, this is really...really...good news! That means that they changed the gear ratios in order to allow 7th to reach the drag limited top speed. I really hope this is true as it would be a major improvement for the 718 GT4/Spyder.

halfmonkey

Again, it was the email response I got from Porsche and the person's title was Manager, Product Communications so I'm choosing to believe it's true unless otherwise proven.

ExMB

If this would've been a technical manager I would've been more inclined to give credence to that. Just looking at the configurator pricing for the PDK on the GT4 vs the GTS 4.0 makes me doubt that statement. No way a "bespoke" PDK is that much cheaper; I actually would expect it to cost more.
While his statement is correct re previous GT3, etc lets keep in mind that GT3, etc also come with CL wheels and the GT4 doesn't.

jmartpr

Some info from PAG.....

https://newsroom.porsche.com/en/2020/products/porsche-dual-clutch-transmission-718-22146.html

From the press release:

"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."

"the 718 Spyder and 718 Cayman GT4 *– now accelerate from 0-100 km/h half a second faster, in 3.9 seconds. They reach the 200 km/h mark in 13.4 seconds (0.4 seconds faster). The 718 Cayman GTS 4.0 and 718 Boxster GTS 4.0, both with 294 kW (400 PS), also improve in the standard sprint from 0-100 km/h by half a second to 4.0 seconds, and then reach the 200 km/h mark in 13.7 seconds (0.4 seconds faster compared with the manual transmission)."

jmartpr

Official photo...they used the same lever and cover as the GT3, check the 2 center stripes below the lever.

halfmonkey

Can you rerun your numbers using the same data but with the updated information from PAG stating that 7th gear will be shorter?

"In all 718 GTS 4.0, 718 Cayman GT4 and 718 Spyder models, the seventh gear of the PDK has a shorter ratio than on other 718 models equipped with PDK (0.71 compared to 0.62 on other 718 PDK variants)."

Archimedes

Why does the gearing in 7th gear matter? Are people routinely, or even ever, hitting top speed in these cars, anywhere? Do people do a lot of track days on the high banking of Daytona?

Rennolazine

I agree its like having a pretty appendix. Pointless. All it does is give worse fuel economy and more drone during mindless highway cruising. Why go through the trouble of even modifying this? And not modifying ANY gearing in the manual? Totally handicapping

Snowy999

Table below is MT with Autoquest final drive.

I wonder how different a GT4 MT from a PDK with this revised drive would be at a fast US circuit ?

I can't see the point of 7th expect for fuel economy stats.

AQ Rev drop PDK Rev drop
39 44
68 3326 75 3306
94 2157 104 2230
117 1533 132 1696
139 1234 159 1358
163 1148 196 1510

edit i've tried editing the table and given up. hows max speed and rev drop on change.