maxpowers

I posted before about heel toe downshifting into 1st and a lot of people suggested not doing it.

The other day I was going around 20 mph in 2nd gear and needed to pass someone and with the tall ratios the car just doesn't have much oomph (sorry for the technical jargon). What exactly would the problem be in downshifting to 1st?

It also got me wondering about the top speed in each gear for a 991.1 C4S. I found the gear rations here, but couldn't find the answer.

http://press.porsche.com/vehicles/20...ifications.pdf

asia

Just go to red line in each gear and note your speed.

No problem downshifting into first, but may take some practice. A good blip and work on smoothness.

maxpowers

Thanks! I'll give it a try.

Considering that 2nd gear gets you to over 80 mph if I try that in the other gears I may discover the 80 to jail time instead ...

koala

carrera manual
outside diameter: 682mm (26.9 inch)
outside circumference: 2142mm
gear 1 rpm 1000 travel per second: 2.7 m/s 9.6 km/h 6.0 mph
gear 2 rpm 1000 travel per second: 4.5 m/s 16.3 km/h 10.2 mph
gear 3 rpm 1000 travel per second: 6.7 m/s 24.1 km/h 15.1 mph
gear 4 rpm 1000 travel per second: 8.0 m/s 28.8 km/h 18.0 mph
gear 5 rpm 1000 travel per second: 9.6 m/s 34.6 km/h 21.6 mph
gear 6 rpm 1000 travel per second: 11.8 m/s 42.5 km/h 26.5 mph
gear 7 rpm 1000 travel per second: 14.6 m/s 52.6 km/h 32.9 mph
gear 1 rpm 7800 travel per second: 20.7 m/s 74.6 km/h 46.6 mph
gear 2 rpm 7800 travel per second: 35.4 m/s 127.3 km/h 79.6 mph
gear 3 rpm 7800 travel per second: 52.2 m/s 188.1 km/h 117.6 mph
gear 4 rpm 7800 travel per second: 62.3 m/s 224.3 km/h 140.2 mph
gear 5 rpm 7800 travel per second: 75.0 m/s 269.9 km/h 168.7 mph
gear 6 rpm 7800 travel per second: 92.0 m/s 331.3 km/h 207.1 mph
gear 7 rpm 7800 travel per second: 114.1 m/s 410.6 km/h 256.6 mph

carrera s manual
outside diameter: 685mm (27.0 inch)
outside circumference: 2151mm
gear 1 rpm 1000 travel per second: 2.7 m/s 9.6 km/h 6.0 mph
gear 2 rpm 1000 travel per second: 4.6 m/s 16.4 km/h 10.2 mph
gear 3 rpm 1000 travel per second: 6.7 m/s 24.2 km/h 15.1 mph
gear 4 rpm 1000 travel per second: 8.0 m/s 28.9 km/h 18.0 mph
gear 5 rpm 1000 travel per second: 9.7 m/s 34.8 km/h 21.7 mph
gear 6 rpm 1000 travel per second: 11.8 m/s 42.7 km/h 26.7 mph
gear 7 rpm 1000 travel per second: 14.7 m/s 52.9 km/h 33.0 mph
gear 1 rpm 7800 travel per second: 20.8 m/s 74.9 km/h 46.8 mph
gear 2 rpm 7800 travel per second: 35.5 m/s 127.8 km/h 79.9 mph
gear 3 rpm 7800 travel per second: 52.5 m/s 188.9 km/h 118.1 mph
gear 4 rpm 7800 travel per second: 62.6 m/s 225.2 km/h 140.8 mph
gear 5 rpm 7800 travel per second: 75.3 m/s 271.1 km/h 169.4 mph
gear 6 rpm 7800 travel per second: 92.4 m/s 332.7 km/h 207.9 mph
gear 7 rpm 7800 travel per second: 114.5 m/s 412.4 km/h 257.7 mph


carrera pdk
outside diameter: 682mm (26.9 inch)
outside circumference: 2142mm
gear 1 rpm 1000 travel per second: 2.7 m/s 9.6 km/h 6.0 mph
gear 2 rpm 1000 travel per second: 4.5 m/s 16.3 km/h 10.2 mph
gear 3 rpm 1000 travel per second: 6.3 m/s 22.7 km/h 14.2 mph
gear 4 rpm 1000 travel per second: 8.0 m/s 28.8 km/h 18.0 mph
gear 5 rpm 1000 travel per second: 10.4 m/s 37.4 km/h 23.4 mph
gear 6 rpm 1000 travel per second: 11.8 m/s 42.5 km/h 26.5 mph
gear 7 rpm 1000 travel per second: 16.7 m/s 60.3 km/h 37.7 mph
gear 1 rpm 7800 travel per second: 20.7 m/s 74.6 km/h 46.6 mph
gear 2 rpm 7800 travel per second: 35.4 m/s 127.3 km/h 79.6 mph
gear 3 rpm 7800 travel per second: 49.1 m/s 176.7 km/h 110.4 mph
gear 4 rpm 7800 travel per second: 62.3 m/s 224.3 km/h 140.2 mph
gear 5 rpm 7800 travel per second: 81.0 m/s 291.5 km/h 182.2 mph
gear 6 rpm 7800 travel per second: 92.0 m/s 331.3 km/h 207.1 mph
gear 7 rpm 7800 travel per second: 130.6 m/s 470.2 km/h 293.9 mph

carrera s pdk
outside diameter: 685mm (27.0 inch)
outside circumference: 2151mm
gear 1 rpm 1000 travel per second: 2.7 m/s 9.6 km/h 6.0 mph
gear 2 rpm 1000 travel per second: 4.6 m/s 16.4 km/h 10.2 mph
gear 3 rpm 1000 travel per second: 6.3 m/s 22.7 km/h 14.2 mph
gear 4 rpm 1000 travel per second: 8.0 m/s 28.9 km/h 18.0 mph
gear 5 rpm 1000 travel per second: 10.4 m/s 37.5 km/h 23.5 mph
gear 6 rpm 1000 travel per second: 11.8 m/s 42.7 km/h 26.7 mph
gear 7 rpm 1000 travel per second: 16.8 m/s 60.5 km/h 37.8 mph
gear 1 rpm 7800 travel per second: 20.8 m/s 74.9 km/h 46.8 mph
gear 2 rpm 7800 travel per second: 35.5 m/s 127.8 km/h 79.9 mph
gear 3 rpm 7800 travel per second: 49.3 m/s 177.4 km/h 110.9 mph
gear 4 rpm 7800 travel per second: 62.6 m/s 225.2 km/h 140.8 mph
gear 5 rpm 7800 travel per second: 81.3 m/s 292.8 km/h 183.0 mph
gear 6 rpm 7800 travel per second: 92.4 m/s 332.7 km/h 207.9 mph
gear 7 rpm 7800 travel per second: 131.2 m/s 472.2 km/h 295.1 mph

koala

keep in mind 7 is OD, so the numbers for 7th are whacky

Valvefloat991

What do you mean whacky?

By the way 6th is overdrive as well.

koala

Sorry, maybe not the best term. Obviously, the car cannot do 410 km/h, is all I meant.

maxpowers

Thank you koala! Very helpful

Jabs1542

6th is a running gear, you can tell by the ratios. Or better yet look at Kolala's post, the speed difference per gear at top speed is roughly 30 mph, until you get to 7th where the difference jumps to 80 mph - that's the OD.

If you ever get to a track with a long enough straight you can tell 6th is a running gear because it has quite a bit of pull when you make the upshift. The back straight at VIR is a prime example

DBH

I was taught that any gear ratio <1 was an overdrive gear. As such, 5th (0.94), 6th (0.79) and seventh (0.62) gears on a 991.2 manual (and PDK) transmission are considered as overdrive. Maybe under some different definition, 6th gear would be considered a "running" (?) gear and 7th an overdrive.

Kenal0

The old guys just start getting going at 3400

97supratt

What???? I’m gonna sell this thing now, I was under the impression it could go 410 km/h. LoL 😂