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Originally Posted by Piotr
Why is it you have such expensive taste uni?
Just replacing your springs is hardly dodgy if you don't go with stupidly hard or low springs. If your shocks are in good condition you won't run into problems. Just becuase the Focus is european doesn't mean it run on different principles, if you tell a company what you want they will do it for you its still works exactly like a falcon.
Since when is getting new sway bars and bushes require to lower a car?
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Ford spends millions of Euros calibrating the suspension based on tuning spring, damper, bush, anti roll bar rates and matching changes in suspension geometry dependent on wheel travel/cornering loads.
If you artificially change your ride height at the rear, you potentially artificially force changes in geometry not suited to the cornering load of the car at a given point in time, eg. toe/steering angle.
At a given cornering load, the car will have a given level of body roll, leading to some level of wheel travel. For that given cornering load, that wheel travel will provide a corresponding amount of passive rear wheel steer.
Lowering cars doesn't always improve handling. I know a few people that lowered their cars and then put them back to factory spec. If the car has crap suspension calibration to begin with, it could well improve it. But we're talking about the Focus
If you just want to do it for looks, then you don't need to worry about this. But near perfectly matched spring, damper, [insert element of suspension here] rates is something that makes a Focus different from a Corolla.