Re: Mercedes W124 E Class Support Group Quote:
Originally Posted by Viraat13 Stiffer suspension, it's got those Bilstein sports shock absorbers too.
You do make a valid point about the excess wear it'll cause to the other components, but while this may sound silly, they look extraordinarily good.
Never a dull moment, I really don't mind these kind of discussions. But you mention it would slow you down in the dry, where as the website you linked me to states the opposite of that. Any particular reason you say that? |
Viraat13, I admire your honesty - and that you haven't thrashed your Dad's car mercilessly around the countryside! Any pics? - can't see the car in your team-bhp online garage.
With stiffer springs and Bilstein dampers there is less chance of sudden and unpredictable break-away with your wheels and tyres - but this is still a huge danger with any car fitted with non-standard, significantly lower profile and wider tyres as cornering speeds rise.
I'm pleased you don't mind me pointing out the drawbacks of this jewelry on the car - mind you, it wasn't your money which bought it!
To answer your question, I think the page I pointed you to may mention that extremes to what is the manufacturer's choice will adversely affect cornering. Also to keep the explanations simple, they don't introduce the idea of surface imperfections or individual cars' suspension, to keep things as simple and clear as possible.
There are two problems in the dry. Firstly: camber changes, poor foundations and larger bumps would highlight the inability of a very low profile tyre to mould its tread to the road when it isn't flat. The wider the tyre, the more of a problem this becomes - there will be a shifting contact patch loading area, from the full width of the tread to much narrower sections of it. Think steam-roller (wide, iron wheels) compared with a motorbike (narrow, compliant tyres).
Secondly: a 'washboard surface' demands a lot of the suspension as speeds build, to maintain the maximum tread contact/pressure/adhesion. With very low profile tyres you have largely got rid of the part of the suspension which usually would absorb these shallow lateral ridges - which are typically up to 2 or 3 cm in amplitude (but can be a lot more on non-tarmac surfaces). This gives the spring/damper/bushing (it is often the bushing which takes up the job) a headache, making it less able to cope with everything else expected of it. In the worst case, the resonant frequencies of the very low sidewall work against the natural resonances in the springs and bushings (which are tuned to a different tyre), creating a situation where the tyres may skip from crest to crest as speeds rise. The carbible page you read also describes the loss of directional stability as tyre width rises, so this is another part of the viscious circle of this reduction of grip and stability.
You can imagine what happens on a slippery surface, even without the added hazard (amplified with wide tyres) of poorly-drained roads, puddles and water crossing a road at a camber change.
I imagine your experience would be a lot worse without your high-quality Bilstein damping. If there is one component which makes the single biggest difference to the way a car goes at speed, it is the suspension dampers. Good quality tyres make a massive difference, too.
Last edited by FlatOut : 1st July 2013 at 03:27.
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