bart1

Pretty sure this guy is a member here:

Eddie Bello
39
Vehicle
Unlimited Race Car
1994
Porsche
911 Turbo
235.4

Bello 39 Vehicle Unlimited Race Car
1994
Porsche
911 Turbo
235.4

jscott82

993 stopping power is amazing. If you haven’t been to a track or practiced high speed threshold braking (even with abs), it may behoove you to find a place and practice, you can probably go alot deeper than you think.

Full thickness 993 brakes should handle a single "full lock" 130 ->20 mph stop just fine (just not too many in a row though).

Cristel993

I've not really pushed my current 993, but my previous one took a lot more to reach brake fade than my E39 M5 that followed. When I took the M5 to the Nordschleife, one thing that our instructor Sabine Schmitz said was how poor the brakes on BMWs were compared to Porsches. With 400hp I couldn't believe how under endowed my M5 was in the brakes department. After one lap I was already getting brake fade and after two laps they were done. Looking forward to really putting my new brakes to the test now they are run in!

Falcondrivr

FWIW, the runway edge lights are 200 feet apart. Count 5 sets up from the end and there might be large white block stripes on the runway. That is 1000 feet from the end. If there are no white blocks, just remember which lights are 5 up. You should be able to stop from any speed a 993 will do in 1000 feet.
If the lights are on, they begin to alternate white, then red, then white with 2000 feet remaining, and go all red with 1000 feet remaining.

Rinty

So Rick, how much distance does your Falcon need for a full stop from rotation speed on, say, a standard day, at full gross?

Edgy01

Do you want to be able to safely stop?

Falcondrivr

Don't really have a way to answer that because if we get to rotation speed (134 knots) we ain't stoppin', we goin'!
However, I can accelerate to V1 (decision speed) on a standard day at max gross (49000 lbs, 127 knots) and then stop again in 5320 feet at sea level.

NineMeister

Here's the data of a stock 1997 C4 VR when I tested it at Elvington Airstrip (which was faster than a stock 1995 C2 nVR):

0 mph, Seconds, Feet, Yards, Miles
10 mph, 0.84, 4.8, 1.6, 0.001
20 mph 1.44, 16.1, 5.4, 0.003
30 mph, 2.09, 41.6, 13.9, 0.008
40 mph, 3.25, 103.5, 34.5, 0.020
50 mph, 4.36, 176.5, 58.8, 0.033
60 mph, 5.45, 264.8, 88.3, 0.050
70 mph, 7.25, 437.9, 146.0, 0.083
80 mph, 8.8, 608.7, 202.9, 0.115
90 mph, 10.56, 828.7, 276.2, 0.157
100 mph, 13.22, 1197.3, 399.1, 0.227
110 mph, 15.98, 1597.5, 532.5, 0.303
120 mph, 20.11, 2293.2, 764.4, 0.434
130 mph, 24.75, 3146.8, 1048.9, 0.596
140 mph, 32.87, 4758.7, 1586.2, 0.901
150 mph, 43.24, 6969.6, 2323.2, 1.320

Keep in mind that this is for acceleration only, so you need to add stopping distances to your calculations.

Falcondrivr

You've actually got around 7000 feet to play with, with a nice curve at the start. You'll probably be entering the runway at about 50 MPH. I'd bet you can get into the 130s easily.
http://maps.google.com/maps?f=q&sour...27595&t=h&z=15

jhummel68

I think if you use 1000' you would have plenty of room to stop. Like Falcondriver said there are two LARGE white blocks at 1000' from the end of the runway, one block on each side of the centerline. There will be other markings on either side of centerline but not as big as the ones we are referring to. If the centerline lights are on, where they go all red is also 1000' remaining.

If you do a high energy stop remember to allow the brakes to cool before you come to a stop. I might also suggest not setting the parking brake directly after the run. The car, provided it is in good mechanical condition, should be able to handle it without a problem. I'd love to do a run like this. Have fun!

Monique

Hey JP,

I like your new wheels!!!

Cristel993

Thanks Rick, Colin and JHummel for the data, much appreciated!

I've worked out the following, assuming a standing start:

Runway is 1.15 miles long or 6072 ft
'97 C4 will make 140mph in 0.901 miles and 32.87 seconds
1.15 miles - 0.901 miles = 0.249 miles
So, accelerate to 140 mph
Brake with 1320 ft remaining

I'm sure I could brake from 145mph to 0 within 1000ft, so I might be able to make this speed when I reach the white blocks?

g_murray

Take video!

(I gave my helicopter instructor a gift of the "GoPro HD" camera with 16Gb card when I got my ticket ...and he loves it!)

"Accelerate - Stop Distance" ...gotta love it!

G.

bart1

Can you take any extra weight out of your car? Spare/tools/rear seats/etc?

Falcondrivr

The runway is in the Airport Facilities Directory at 6130 feet useable. But, on Google maps (linky above), you can see that there is a 500 foot overrun (area with the arrows) at the western end. There is a smaller one at the eastern end. You'll actually have 7000 feet available...
Oh yeah, there are no instrument approach markings on this runway...FORGET EVERYTHING WE SAID ABOUT THE WHITE BLOCKS. The lights are still 200' apart though.