IRS ב- FWD

[proxima]

מתוך דיון מענין בפורום הונדה סיויק על הצורך במיתלה אחורי עצמאי (יענו IRS) במכונית הנעה קדמית .

 

As for the independent rear, I think it's heavily overrated. I don't see how it's needed in a compact FWD car. With the weight and drive in the front, the problem is the grip of the front tyres. The rear can be then simply tuned to get whatever character of the car one desires, understeering, neutral or slight oversteer. As the Type-R shows, there is no problem to make an understeering car with a simple torsion beam setup (not that I value such a decision much). On the other hand, some of the best balanced and most fun FWD cars are/were of this type (e.g. the Renault Sport series). As soon as one realizes that any neutrally balanced FWD car lifts the inner rear wheel in the corner, the whole point of independent rear suspension and the discussion of positioning of the rear wheels on the road becomes completely moot. Even with an independent rear you need something functioning as an antiroll bar in a sports car, so at the end I fail to see any hindrance of a torsion beam setup.

 

 

 

The fastest production FWD car in the Nordschleife is Megane RS R26. Guess what does it have in the rear.

Compare for yourself:

 

Megane RS R26.R (230hp): 8:17

Honda S2000 (240hp): 8:39

Ford Focus ST (225hp): 8:51

Vauxhall Corsa VXR (192hp): 8:54

 

Yes, it's seems you really can polish a turd. It's true the Megane is lightened by some 120kg, but this does not itself explain the enormous advantage over the Focus ST. The better tuned suspension is the key. Also notice how competitive the Corsa is with the 'primitive' suspension type.