is softer better?
Tuesday, June 6th, 2006Everyone likes the look of a lowered car on large wheels but when it comes to the way a car goes down the road you want suspension travel & small, light wheels. Problem is the car manufacturers are now building their cars ‘pre-lowered’ and blinged out from the factory and its getting worse year by year.
The result is that today’s cars are already too stiff and low to start with; in fact in some cases aftermarket tuners will soften the suspension to improve handling. Take for example the ‘01-04 M3 - Schnitzer’s kit softens the rates, as does DINAN’s. The ‘05 M3’s improved handling came from suspension settings that were more lax. (The Z4 and new 3 have been criticized for having too little suspension travel and wheels that are too large as well, particularly with the sport package).
One of Porsche’s engineers recenly admitted that their cars with PASM adjustable suspension were actually faster around a track with the suspension in the standard rather than sport setting but that driver confidence and the subjective impression of speed was greater in sport mode.
This road test from evo is just one of the many examples I’ve found in the popular press and during my own evaluation drives of cases in which the handling of the car was diminished by larger wheels or the firmer suspension setting. Here are a few excerpts:
On the bumpier, tighter stretches it pays to knock the [CLS’] suspension back one setting, as the stiffest mode never lets the big Benz settle completely…
[The M5] also has two stages of suspension stiffening, but the second of these is simply too uncompromising for anything other than the very smoothest roads. However, once you’ve found the ideal setting, the M5 allows you to mount a more sustained attack on the road…
You’d expect the bigger rubber to generate more grip, but you never really sense the [Quattroporte] Sport GT keying into the road, and though it does carry prodigious speed, there’s less feedback and progression. When at or close to the limit, there’s a snappy edge to the handling that the standard car doesn’t have. Worse, on the bumpiest sections of our test loop, the Quattroporte’s wheel control falls to pieces, the oversized alloys simply overwhelming the Skyhook dampers’ ability to control their vertical movement. It’s a real shame… Sport mode… stiffens the suspension, which is then too much for bumpy surfaces and exacerbates the wheel control problem. It all seems so unnecessary, for in all honesty there was little wrong with the standard Quattroporte chassis… The truth is we’re still huge fans of the standard car, but it’s a great shame that the Sport GT modifications prove the old adage ‘less is more’ so conclusively.
(Click here for more on this topic).