UrS4boy

Enjoy. Translation of Senna's comments in the blue box is below the page.



"Permanent all wheel drive

Its a big advantage against competition. With this car you get alot of stability, since you got traction on four wheels, there is no danger with 2 axes to skid in a fast corner. On wet conditions this sistem is fantastic. Delivers alot of security for pasagers.

Safety

In Germany i drove an Avant s4 [station vagon of tested vehicle] on autobhan at more the 240kmh. I did the following, without touching the wheel i pushed hard on the brakes. The car stopped in a straight line and brakes didnt fade. I was very impresed with the braking and abs sistem.

Overboost

This is a feature we used in our turbocharged f1 cars. When overtakin other cars all i had to do was push a buton placed on the steering wheel wich made the turbocharger apply extra pressure on engine. In the s4 you get the same sistem wich reacts automaticaly. The engine gets 25hp more instantaneously. When overtaking a truck on a two-lane road, the overboost feature guarantee the maneuvre more quick and safe."

Translation courtesy of kinex on the S2Forum

UrS4boy

Here is another photo.

UrS4boy

The reason Ayrton Senna was intersted in the Audi S4, his family were the exclusive importers of Audis to Brazil at the time.

Jeff-AudiUSAParts

Very interesting!

UrS4boy

Another one (courtesy of diogocartier from Brazil)

moorewr

Thanks for posting these!

(The overboost system was news to me. Learn something new every day)

UrS4boy

There is boost and overboost. Overboost is 2.15 Bar (for 15 seconds). Needs wide-open throttle (WOT). This is absolute pressure not relative pressure pressure so

Overboost = (2.15 x 14.5)-14.7 = 16.48 psi (about 17 on your gauge)

Adds more hp but not for long. Here are the boost and overboost lines.

UrS4boy

Found the source of that photo, a long article about Senna with lots of the same Audi S4 photos we have seen:

http://ayrtonsennavive.blogspot.ca/2...ton-senna.html