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Af Northloop.co.uk:
"Lap timing on the Northloop
You could say that there are four different ways of measuring times on the Nürburgring Northloop.
The first way is to measure the time of the full lap, it is extremely rare and virtually no one who does.
The other way is to measure by the German magazine Sport Auto (Horst von Saurma). They measure almost the full lap, however, it is a stretch called the T13 that is not included in Sport Auto's timing. This stretch is about 200 meters and takes about 6 s (a bit depending on the car). About Sport Auto for example driving a car at 8 m 10 s, it means therefore that the entire yard will take about 8 m 16 s.
The third way to measure, which is also the most common for us hobby drivers, is to measure something called BTG. BTG stands for Bridge To Gantry. It measures the time from the bridge (B) located at the end of the long straight (Döttinger Höhe), to (T) be run in a "steel frame" (Gantry, G), which is in the beginning of the long straight. In this lap the straight is not counted, but the T13-stretch is.
So how will this BTG compared with Sport Auto's lap? Well, first you need to deduct the time it takes for Sport Auto running Gantry To Bridge (basically all straight). After that, you need to add the time it takes to run the T13-stretch.
Here's an example. Suppose Sports Auto driven a car in 8 min 10 sec. To convert this to BTG, we first draw of the time it takes to run straight. Suppose that the straight (Bridge To Gantry) takes 27 s. Then, we are therefore down to 7 m 43 s. After that, we need to add the time it takes to run the T13-stretch. Suppose it's 6 s. This means that Sport Auto 8 m 10 s converted to BTG will be 7 m 49 s.
How are we to know how long it takes to run straight and T13-distance? Well, after studying lots of log files, I see that T13-route takes about 6 s. It's very small differences between cars. For example, it takes about 6.5 s for a 130 hp Suzuki Swift, while it takes about 5.5 s for a 650 hp Porsche Carrera GT. Therefore, we can have it as a rule of thumb that the T13-route takes about 6 s.
How long does it take then to drive straight stretch, Gantry To Bridge? Yes, here it's much bigger difference between the cars. Here, of course power is very important. For a BMW M3 CSL with 360 hp will take this route about 27 s, for a Nissan GT-R with 485 hp about 23 s and finally for a Renault Megane R26R with 230 hp, it takes about 30 s.
BTG time also depends on whether one starts from a standstill or if you drive a flying lap. If you drive a flying lap, which comes in at full speed under Bridge, then "earn" it's about 1.5-2 compared with when starting a standstill and accelerates in the Bridge.
The last way to measure the times is something called T13-Gantry. In this case, neither the T13-leg or straight with.
But as I said, the most common is to measure the BTG-times. As an example, we can calculate the BTG-time for a BMW M3 CSL. Horst von Saurma drove the car on 7 min 50 sec. So that means 7 m 50 s - 27 s + 6 s = 7 m 29 s. Horst von Saurma drove the French Baguette Renault Megane RS 250 Cup at 8 m 29 s. It thus implies a BTG-time of 8 m 29 s - 30 s + 6 s = 8 m 5 s. Of course, all Horst times set in the original cars.
Important in this is to note the Sports Autos and Horst von Saurma test procedure. Horst usually drive the car one lap, and then takes time for the second lap. Horst time does not show how fast the car actually can go, but rather how fast Horst driving the car at a given time under given conditions. Therefore, for example, Horst is 9 s slower than Nissan's test driver Toshio Suzuki in a GT-R, or for that matter is also Horst 6 s slower than the Porsche's test driver in a 997 GT2 RS. This must be emphasized again and again!
Horst times is no record of how fast a car can go. Horst is the world's fastest race driver in each car, but is it enough so that there is anyone in the world who drive every car as fast as Horst in as few turns. The magic with him is that he can put a good time in any car, and only after a few laps. Horst he has a great ability to immediately adapt to any car and then put a good time.
In my world, Horst times thus a very good reference for us hobby drivers and therefore something we can compare with. This of course if you drive a car that is comparable to that Horst was driving at the time of testing. Horst times are also a good way to "compete with itself", ie see if you use the car's full potential. I usually say, that if one is a hobby driver, then if you are 5-10 s after Horst you have used up a large part of the car's potential.
I still have not seen a single time or log file where someone running as fast or faster than Horst.
To view the event at the Nurburgring next week so I've put together some approximate BTG times. Note that these times are approximate and that they are set with the original cars on the deck as shipped from the factory.
Do you have a Driftbox / Performance Box, there is a file that I've done that you can easily load into them. The file is attached here. It is important that you put the file in a folder on the SD card labeled DATA and then rename the file to DBOX.dsf.
All about BTG-times are calculated from Sport Auto times, and it's always Horst driving.
BTG lap time table
Porsche 997 GT2 RS: 7 m 8 s
Porsche 997 GT2: 7 m 14 s
Porsche 997 GT3 RS mk2: 7 m 15 s
Nissan GT-R (485 hp): 7 m 21 s
Ferrari 458 Italia: 7 m 21 s
Porsche 997 GT3 RS MK1: 7 m 29 s
BMW M3 GTS: 7 m 29 s
BMW M3 V8 7 m 45 s
Audi TT RS 7 m 47 s
Mercedes E63 AMG 7 m 50 s
BMW M5 V10 7 m 53 s "
_________________ Þórður '99 M5 SC // '89 M3 S85 // '04 Patrol GR  Alpina wrote: S85 er vondur mótor þó að hann sé kraftmikill...
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