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Lotus Evija's wild aero setup is detailed by chief aerodynamicist

The Lotus Evija is a car of firsts for Lotus. To that end, the company has spent a lot of time talking over the details. Today, we get to learn about the wild shape’s aerodynamics and what Lotus engineers were trying to accomplish. Richard Hill, chief aerodynamicist for Lotus takes a dive into all the details, and the video at the top of this post offers a great visual. “Most cars have to punch a hole in the air, to get through using brute force, but the Evija is unique because of its porosity,” Hill says. “The car literally ‘breathesÂ’ the air. The front acts like a mouth; it ingests the air, sucks every kilogram of value from it – in this case, the downforce – then exhales it through that dramatic rear end.” We can see what Hill means as we look at the Evija in photos. Instead of a regular front bumper, this one has pass-throughs that direct the air back into the side of the car. Lotus hasnÂ’t released the all-important coefficient of drag figure yet, but we have to imagine itÂ’s very low. The front splitter (below, left) is responsible for a few different things. The opening in the center takes in air to cool the battery pack that is mounted behind the seats. Then, the outer section of the splitter channels the air to the “e-axle” for cooling of the electrical components. And finally, it also produces downforce.  There are a couple more tunnels for air to pass through in the rear. These “holes” are likely the most distinctive design feature, especially when accentuated with the LED taillights. Hill says that these are also fully functional and help to reduce drag. “They feed the wake rearward to help cut drag,” Hill says. “Think of it this way; without them the Evija would be like a parachute but with them itÂ’s a butterfly net, and they make the car unique in the hypercar world.” On top of all these porous body structures, there are pieces that move. The rear wing can elevate upward from its flush body position and deploy into clean air above, creating more downforce. And then thereÂ’s an F1-style drag reduction system. This uses a horizontal plane that deploys from the car to make it slipperier through air. The final big piece of this puzzle is the underbody sculpting that directs air into the massive rear diffuser. This causes an upwash of air, in turn creating a massive amount of downforce. Hill sums it up quite nicely.

How the fastest Elise ever compares to 3 sportscars you know

The Lotus Elise had its 20th anniversary last year, and the British sports-car maker's belated celebration is the quickest production Elise ever around its test track. The new Elise Cup 250 can sprint to 60 miles per hour in 3.9 seconds and reach a top speed of 154 mph. It's essentially Lotus' answer to a Porsche Cayman GT4. The Elise Cup 250 replaces the Cup 220 in the model lineup, and Lotus plans to limit production to 200 units annually. The 1.8-liter supercharged four-cylinder now makes 243 horsepower and 184 pound-feet of torque, compared to 217 hp and 184 lb-ft from the predecessor. The company claims the Cup 250 laps its test track in 1:34, which is four seconds better than the 220. On paper, the Cup 250 could give a Cayman GT4 quite a fight. The Porsche's 385 hp wins on power, but it weighs significantly more at 2,955 pounds. Those differences translate to a slower 60 mph run of 4.2 seconds but a faster 183-mph top speed. We also think the upcoming Jaguar F-Type SVR could make for interesting competition around a very tight track. A recent leak suggests the new model has over 560 horsepower and a 200-mph top speed, so it would easily win on an open course. On a curvy circuit, the Lotus could be an intriguing challenger. Lotus Elise Cup weighs a scant 2,053 pounds in normal trim and 2,030 pounds with the optional Carbon Aero package, which includes carbon fiber parts for the front splitter, rear wing, rear diffuser and side-floor extensions. To save weight, Lotus fits the car with a lithium-ion battery, carbon fiber seats, and forged alloy wheels. The suspension and brakes carryover from the 220, including Bilstein dampers, Eibach springs, and AP Racing brakes. Lotus models often have a sparse interior, and that continues with the Cup 250. The options list includes usually common items like air conditioning and cruise control. A package even combines a radio, carpets, and sound deadening. Standard cars come with a red or black Alcantara interior, but leather is available. The Cup 250 goes on sale in April for 45,600 pounds ($65,170 at current rates), but it isn't available in North America. This forbidden fruit makes for an interesting comparison to other stripped-down models, though. For example, the Evora 400, which is for sale in the US, is slightly slower to 60 at 4.1 seconds but its 1:32 time around the Hethel test track is two seconds a lap quicker.

Aston Martin and Lotus each issue recalls

A pair of head-turning high performance cars are catching some attention off a different kind, in the form of safety recalls. Aston Martin and Lotus have issued recalls for the V12 Vantage Coupe and Evora, respectively.
Aston Martin's affects 169 examples of the 2009-2012 V12 Vantage Coupe. It concerns the tire-pressure monitoring system, and is less a malfunction than it is a compliance issue. The TPMS does not alert the driver until the front tire is more than 25 percent below the recommended cold tire pressure. Federal Motor Vehicle Safety Standard No. 138 states that the alarm must sound when tire pressure is "equal to or less than either the pressure 25 percent below" the recommended cold inflation pressure. To address the issue, Aston Martin will notify owners and reprogram the software, free of charge.
As for Lotus, 80 supercharged Evoras have been recalled, all built between February and September, 2011. The problem involves an engine-mounted oil feed pipe, which could rupture, causing loss of engine oil or a possible fire if the oil sprays onto a hot engine.