Mysterious 80's High Speed Test? Any info?

[F40 LeMans]

As I already think, these 911 tuned engines seems to be underrated in power output. The CTR was just dynoed before the event a 469 hp, but it seems it perform in excess of 500 hp engine. Even the RS/koenig seems to perform as close as a 600 hp engine. I think it was just a work of manual over pressure for the best test results.
Usually these tuned old 911s has a boost faucet in the cockpit to vary the boost pressure behind your choice.

RS Tuning built years later a 690 hp engine spec fitted on a 911 Cabrio but it was not quicker than this RS/koenig test.

 

[F40 LeMans]

It's very interesting how tuned supercharged 911s react so different to instrumental results:
The Motorsport Design 911 Turbo was claimed as a 646 hp and it not closed the 1/4 mile better than 12 seconds at 126 mph (203 km/h).
The 911s tested in the WFC 1987 were claimed weak but they perform quicker than the MD Porsche. Engine power bands, gearing and body weight sometimes really have conflicting values. Often noticed. (Or sometimes engines seems don't work correctly, sometimes are too much fast...)

What is very interesting to me, is the different engine work of the tuner. I have a lot of tuned 911s instrumental test and I have to point out that RS Tuning was the engine tuner I prefer just above RUF. Usually it adopts the technique of strong mid range engines compared to very high revs engines and this kind of technique seems to be effective in the acceleration results at the expense of extreme high power. They usually not bring for top speed results but they seemed to be effective behind on rolling start acceleration runs.

 

[tieftaucher]

Here the article in Holland language. Look at the RS/Koenig 935 how was fast; 100-200 km/h 5"9!

Does anyone know which magazine/issue this article is taken from ?

 

[Rolf]

Great nostalgic trip back in time, those were pretty awesome cars at the time, Countach, GTO, 959, Testarossa, poster cars and then that AMG Hammer was a monster saloon.

 

[KiwiRob]

The MOTORSPORT DESIGN 911 seems so crazy. It weight as the CTR, same gearbox, it has 646 bhp but it's not as fast as the Ruf.
I think it's a question of torque again. The peak at 7500 rpms compare to 5950 of the Ruf means two different power bands.
The Ruf one as much more effective.

I think the reasons for this are, the Ruf was based on the Carrera bodyshell, the Motorsport Design 911 uses the wider Turbo bodyshell which has more drag, the Ruf also used a different front windscreen, the stock windscreen was more upright, basically the Ruf has better aero hence the higher tosppeed.

 

[tieftaucher]

Frère messed up the table in the Dutch language article. For all cars except the GTO he added 0.1 seconds to the 0-100 mph time to get the 0-160 km/h time, he should have subtracted instead since 100 mph are about 161 km/h.

 

[F40 LeMans]

Sorry guys no source of the article

 

[tieftaucher]

The 133.5 mph reached after 1/4 mile by the Ruf and the RS are impressing, even the Enzo reached only 133 mph when tested by R&T.