Joined
·
2,755 Posts
Street cars are nowhere near low enough for a diffuser to work. Bernoulli's principle is the explanation for the Venturi effect the diffuser is supposed to create. It doesn't.
The only trunk lid spoiler that can work on a street car is the lip type. Wings with supposedly effective slots are purely cosmetic. The trunk lid lip type spoiler is a variety of Gurney flap. It reduces drag by using turbulent air to mimic a teardrop body shape. Turbulent drag is higher than the form drag of the theoretical teardrop shape but skin friction is eliminated. The net result is a reduction of total drag. You also get a taller trunk and a much shorter car.
High performance tires are a waste of money on most North American roads because they never get hot enough to deliver the grip you're paying extra for. Ultra high performance all seasons are now the way to go unless you drive frequently on very twisty roads or track the car. I'd be interested to see the first cold stop performance of the Pilot Sport 4S against the A/S 3+.
Road cars rarely experience the second hard consecutive stop, let alone the 20th you really need to get your money's worth out of the top performing tires and brakes.
The only trunk lid spoiler that can work on a street car is the lip type. Wings with supposedly effective slots are purely cosmetic. The trunk lid lip type spoiler is a variety of Gurney flap. It reduces drag by using turbulent air to mimic a teardrop body shape. Turbulent drag is higher than the form drag of the theoretical teardrop shape but skin friction is eliminated. The net result is a reduction of total drag. You also get a taller trunk and a much shorter car.
High performance tires are a waste of money on most North American roads because they never get hot enough to deliver the grip you're paying extra for. Ultra high performance all seasons are now the way to go unless you drive frequently on very twisty roads or track the car. I'd be interested to see the first cold stop performance of the Pilot Sport 4S against the A/S 3+.
Road cars rarely experience the second hard consecutive stop, let alone the 20th you really need to get your money's worth out of the top performing tires and brakes.