brucemillar
MB Enthusiast
- Joined
- Nov 18, 2010
- Messages
- 8,663
- Car
- C55 AMG Wagon - W124 300te 4matic Wagon - BMW 4.8is X5 E53 - SWB Pajero 3.5 V6 24v
Mactech said:Err...no! But this is part of my notes on the car aerodynamics: Following the XJ120 Jaguar which had a top speed of 120mph, the implication of the XJ220 name was clear to the public, but apparently never meant by Jaguar. The car had also been sold on its dramatic looks, so little could be done to change those. There was a limit of about 550bhp that could be produced within the emission regulations so the aerodynamic drag would dictate the top speed of the car. Although the basic shape remained true to the prototype show car, much effort went in to the detail to encourage the car to produce some real downforce and to aid stability. Two large venturi tunnels beneath the rear of the car and considerable wind tunnel testing allowed us to hit the stability target with acceptable drag. I have a very personal reason for being thankful for the downforce and therefore stability of over 600lbs at 200mph. I was the first person ever to drive the car at this speed! After nearly two days of engine and aero mapping at speeds of up to 160mph at Bridgestones 8mile test oval in Fort Stockton in Texas (yes, everything really is bigger there!), we were eager to see if our calculations of top speed were correct. Entering the second turn on the first lap, the accurate speedometer was already reading 208mph just as a bird hit the top of the screen. I ducked and chickened out (!), but the car tracked absolutely true as I headed straight back to the workshop. Andy Wallace arrived the following day for performance testing, and was absolutely flat through both turns on the very first lap on his way to 217mph. Im not sure if that says more about the cars inherent stability of the lack of imagination shown by racing drivers, but aerodynamics had moved, once again, to the top of priority list. But Andy is a good friend and a Le Mans winning driver![]()
Thank you for sharing. I feel I could spend an interesting evening tucked away in the corner of a pub with you.
Did Elton John's chauffeur not crash his brand new one on delivery?
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