Our close friend Richard Aucock is back again with more news around the new 5 Series. This new episode ties into the one published yesterday when Jos van As, BMW Group Driving Dynamics Director, talked about the ride quality in the new 5 Series Sedan.
Here is an excerpt:
“BMW’s new F10 5 Series may be closely associated with the 7 Series and 5 Series GT, but this doesn’t mean it’s simply a modified version of those cars.
‘In terms of driving dynamics, we always start from a clean sheet,’ explained Jos van As. But how, given the interrelation of components? By starting from the start, not working backwards.
Van As talks through the methodology, showing the 5 is more than a scaled down 7 (or, indeed, a 1/6th-price Rolls-Royce Ghost…). His work begins before a CAD pixel is created, through a logical build-up process:
- DNA – ‘Here, we define proportions, weight distribution, drive concept, aero effects such as lift coefficient front and rear, and so on’
- Suspension – Spring and damper rates are decided upon (‘ride quality was the focus with F10’)
- Tyres – Design of car, weight of car under different load conditions (‘for example, we can decide what size wheels we can fit, and what pressures we need’)
- Steering – Ratio, speed of response (‘the 5 Series has EPAS, like the 7 Series, but the ratio is faster’)
Once you have all this, you can begin setting up the standard suspension. With the 5 Series, says van As, ‘a team of 4 engineers set up the standard car.
‘This standard car is the base; we add on dynamic features to this platform, all controlled by ICM.’