2008 Chevrolet Cobalt Lt Sedan 4-door 2.2l on 2040-cars

Auto blog

GM exploring ways to raise half-ton Duramax diesel tow rating

Lots of truck owners cheered when GM announced fuel economy numbers for the 2020 Chevrolet Silverado with the 3.0-liter Duramax diesel inline-six. Even after Ram let loose its EPA mileage ratings for the 2020 Ram 1500 EcoDiesel, the Chevy oil-burner still took the trophy. The victory was years in the making, GM engineers spending an entire four-year development cycle refining the LM2 Duramax to increase mileage. The tradeoff, as well all know by now, is towing; the Duramax in half-ton duty pulls a maximum 9,300 pounds in the Silverado. Rivals across town can do more, the Ford F-150 PowerStroke rated at 11,500, the Ram 1500 EcoDiesel game to pull 12,560. GM engineer John Barta told Muscle Cars & Trucks that more hauling chops could be on the way, explaining, "We’re actually looking at upgrading some of the materials around (the engine bay) to see if we can maybe raise our tow rating." Engine bay materials are at issue due to thermal complexities underhood. John Barta, GM's assistant chief engineer of diesel engine controls, said the Duramax's inline-six configuration allowed engineers to get emissions hardware like the combined selective catalytic reduction, diesel oxidation catalysts, and diesel particulate filter unit closer to the engine, where it heats up quicker, getting emissions down quicker. But that filter puts another heat source in those confines, enforcing a cap on the tow rating to keep the engine and other systems from overheating. "If you look under the hood," he said, "youÂ’ll see a significant amount of silver ‘moon tapeÂ’ around to make sure things arenÂ’t getting overheatedÂ… if we were to go up in higher towing, which we can, we start impacting the possibility of deteriorating some of the components.” There isn't much space for more grille, so swapping for a better grade of "moon tape" or a different kind of material could reduce engine bay heat, extracting a higher tow rating in the process.  It's important to note a point Barta's been making for months about the Duramax figures, though. "Even though itÂ’s nice to brag about big numbers, in reality, light duty customers are not towing that large with their trucks," and, "We do know that (95 percent) of our light duty customers donÂ’t tow over 9,000 pounds." On our First Drive of the 2020 Silverado diesel we called out the tow rating, but emphasized that the Chevy and GMC have more important challenges to overcome.

Watch how Corvette Racing's new collision-avoidance radar system works

When it comes to technology used in racecars, we generally expect it to trickle down to production cars, not the other way around. Well, Pratt & Miller has developed a new rear-facing radar that operates in a similar fashion to what we're used to in modern blind spot detection systems, only it is also capable of tracking cars as they approach and relaying vital information to the driver via a large display screen.
The innovative radar system debuted at last weekend's 12 Hours of Sebring for Corvette Racing, and this system makes perfect sense for endurance races like this since the cars sometimes have to drive through the night and in poor weather conditions.
The radar can detect cars even with poor visibility, and uses easy-to-distinguish symbols for the driver to identify.

Fernando Alonso fails to qualify as Pagenaud takes Indy pole

Former Formula One world champion Fernando Alonso narrowly failed to qualify for the Indianapolis 500 on Sunday as France's Simon Pagenaud took pole position for the May 26 race. Kyle Kaiser beat out Alonso for the final spot in the 33-car field when he finished third, one spot ahead of the Spaniard, in a six-car shootout that determined the Indy 500's last row. The 23-year-old Kaiser, the last driver to take the track, averaged 227.372 mph for his four laps, a mere 0.019 mph ahead of Alonso's 227.353 mph average in the McLaren-prepared Chevrolet. "We never surrendered. We kept trying," Alonso, 37, told reporters after a tough week at the famed speedway. The Spaniard crashed his Chevrolet in practice on Wednesday and missed nearly two full days of practice while a back-up car was prepared. Then he tried five times on Saturday to qualify, puncturing a tire on the first attempt. Alonso had a completely new set up for Sunday's shootout but could not get the speed he needed to qualify. "I think the car felt better today than what we had yesterday. (So I am) happy with things we tried," he told reporters before learning he had not qualified. Pagenaud had a four-lap average speed of 229.992 mph to become the first Frenchman to take the pole since Rene Thomas in 1919. "It's just amazing," Pagenaud, who last week won the IndyCar Grand Prix on the track's road course, told NBC Sports. "Obviously last week was amazing, but this is even more special." He will be joined by Ed Carpenter (229.889) and Spencer Pigot (229.826) on the front row. But the Cinderella story belonged to Kaiser, the 33rd qualifier. "I don't think I can wrap my mind around what we just did," he said after bumping Alonso from the field. "This is all the credit to the team. They've been working non-stop trying to get this car ready for us and they did everything that we needed to get into this field." (Reporting by Gene Cherry in Raleigh, North Carolina; Editing by Ken Ferris)Related Video: Motorsports Chevrolet McLaren Racing Vehicles F1 IndyCar