How many times do you see an aggressively driven FWD car lifting a rear wheel on high speed corners? Now imagine if that car had a wing pushing the rear downwards, how much better balanced would it be?
Hatch, coupe, saloon, doesn't matter: What does matter is the angle and location of the wing, but that's equally true for RWD cars. With FWD you're balancing the vehicle, as opposed to pushing the rear down for grip onto the driven wheels with RWD. If you're cornering at 100mph airflow doesn't give a hoot what wheels are driven, it only cares about playing silly buggers with dynamics. If you found that you couldn't steer at that speed, then something was massively wrong with your setup.
BTCC alone proves this:
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Don't know about you but I haven't driven a lot of touring cars on tracks lately. Again, they have complimenting front (and more importantly underbody) aero. But yeh, I'm not gonna argue further, I know you have a point, I have mine, all I'm saying is don't put a big gay wing on a stock Skoda Octavia and expect to still have any steering response or traction from the front wheels at 100mph.
Not sure you do have a point at all , so a large wing reduces front grip and steering response on fwd cars but not rwd cars? What nonsense !
FWIW both my Octavia's I have owned had/have rear spoilers from the factory (and FWIW the record breaking 227mph Octavia also had a rear spoiler) yet have plenty of grip and steering at 100mph plus
The new Civic Type R comes with a massive wing as stock