aussie jimmy

nj-gt works at nasa hahahaha

NJ-GT

Worked until 2011, Mr. Change decided to cancel the space program to fund wellfare and the mandatory private healthcare bill.

I take the OP 1,000,000 times over visionary Mr. Change.

woshimihei

i will never try 300km/hr after reading those centerlocks failure posts.

10 GT3

Unless you have a lot taller than stock rear tires, that is no where near 200 mph. At 8400 rpms in 6th would be 204 mph. At 7800 rpms, that is only about 187-190 mph (depending on which tires came on it).

rcg412

That was a fun event ( did NASCAR reverse). I got near 150 and nervous... But if I had another session...

YearOne

Indicated 193mph on a 2008 GT3 running 888s

The Baron

TCS,

After seeing your portrait, I'm even MORE impressed with your driving abilities in the Targa ! BUT I have to ask ........ how do you fit in those tight racing seats !

datax

Porschefahrer

I have not yet checked with a gps, but my stock 3.8 RS regularly goes 200 mp/h on our German motorways. Fastest speedo indication has been 207 mp/h (334 km/h), but that was a long straight stretch with a slight slope down. Car felt extremely stable at that speed.
I used to have a ML63 AMG without limiter which would do close to 200 mp/h, but that did not feel as right and as safe.
RS goes quickly up to 300 to 310 lm/h but then needs a little bit of space to go higher.

10 GT3

Looks like your speedo is reading high. 997.2 GT3 RS can't hit 200 mph. It runs out of speed due to gearing at 193 mph due to the shorter gearing. This is also why the RS 4.0L has the same top speed as a RS 3.8. If they had taller gearing in 6th, 200 mph might be possible in an RS 4.0. Using a GPS will confirm the real speed.

911SLOW

Nope. The RS will actually do 197.00617 mph



3.8RS GT3
1st 3.82 3.82
2nd 2.26 2.26
3rd 1.64 1.64
4th 1.29 1.29
5th 1.06 1.06
6th 0.88 0.92


Final 3.89 3.44




MPH = (RPM * tire diameter inches) / ( Final Drive ratio * selected gear ratio *336.15 )


for a 997.2 GT3 using stock gears and stock tires
305/30/19 (diameter = 26,2)

we have
MPH= (8500 * 26.2) / ( 3.44 * 0.92 * 336.15 ) = 209.33mph




for a 997.2 GT3RS using stock gears and stock tires
325/30/19 (diameter = 26,67)


we have
MPH= (8500 * 26.67) / ( 3.89 * 0.88 * 336.15 ) = 197.00617mph

10 GT3

GT3 RS 4.0L roadtest. Look at the test data:

http://www.roadandtrack.com/var/ezfl...0acf3a2427.pdf

Yes 8500 in 6th = 193 mph. In the article they even talk about seeing 200 mph on the speedo while it is gear limited to 193.

Q&A

i did 321 km/h in my stock 996 GT3 and am sure there was a bit more left.
Handling and downforce were absolutely super. Glued to the road
Second part of the clip shows the odometer. 3rd part is rear view.
check the sound at 1:55

NTY

There are other variables when it comes to top speed.

1) Wind condition. Head wind or tail wind can make a huge difference.

2) Tyre diameter is variable. Thread depth, pressure, heat and speed will have an effect on tire diameter. Tire will be taller at 300km/h than 100km/h and hence giving a bigger diameter. And so in theory, the error at 300km/h will be lower than 100kmh. Diameter on same tire size between different tire makers is also different.

3) All cars I have owned or own have speedo error. So reading their relative difference is good enough for me.

TB993tt

Also climatic conditions, engine power may be up or down if the conditions vary a lot from DIN conditions....

My GT2 was measured on engine dyno at 544PS DIN yet my top speed attempt on an autobahn only managed 199.6mph despite nearly 3 miles at full throttle in 6th..... outside temperature was over 25C so engine power was probably 30 or so hp down.



Took another couple of hundred hp to be able to nail the 200 mark efficiently