Hi.
Did any of you guys thought that maybe each model in the GP range has it's (well...limited in performance) suspension fine tuned taking into consideration the kind of tire the model is supposed to have?
I mean, I wouldn't bet that my Active 1.4 8v has *the same* suspesnsion settings as a Sport M-Jet with 130PS! If they do...hey...that's it.
But listen to this: maybe the suspension is setup such that in a critical situation when the shock absorbers and/or springs are approaching their designated limits, the tire takes over to a certain extent. I can imagine a situation where with the standard (narrow and ugly) tires, the back will step up and slide (effectively protecting the car from a certain roll-over situation), and if in the same situation we would be using high grip, wide tires, the car would in fact roll-over because the tire would use up all its elasticity (becoming hard as a rock) but it would not loose lateral grip yet. So the car suddenly would have a fulcrum on the outside rear tire and it tilts over!
ESP? EPS systems won't save you. They're setup with ~300 different parameters and they're set for the standard tire sizes. (Whichever size is standard for you.) In the above situation the ESP will monitor the wheels accelerations, steering wheel angle, etc. It will see that, trajectory-wise, the car will indeed follow the route imposed by the steering angle! It will not know that the tires are not standard, that they have become hard as a rock and that a tilt is imminent.
So, putting different tires that what's specified in the car's manual is risky bussiness.
What do you think?