قالب وردپرس درنا توس
Home / Technology / 2019 Chevrolet Corvette ZR1 First Test: Out with a bang

2019 Chevrolet Corvette ZR1 First Test: Out with a bang

No commitment, fast and easy Free quote for new car

That is it. The zenith. The top dog. The 755-hp ne plus ultra Chevrolet Corvette C7. The strongest and probably last variant of the front engine Corvette.

While the mid-engine C8 is approaching in the near future, there are now 28 seventh-generation Corvette (C7) iterations for the 2019 model year, including coupe / convertible versions of Stingray, Grand Sport, Z06 and now the ZR1. Is that as good as it gets? Is the ZR1 the largest Corvette ever?

LT5> LT4

Let's start with what makes the ZR1 the ZR1, its powerful LT5 engine. If you like comparisons, the C7 ZR1's V-8 supercharger makes more than double the V-8 horsepower in the 1990 C3 ZR1 and 117 more horsepower than the C6 ZR1. Based on the venerable LT4 of the Corvette Z06, the Camaro ZL1 and the Cadillac CTS-V, the 6.2-liter LT5 features a new 95mm throttle body, port and direct fuel injection, an improved crankshaft and new oil system and a new Eaton compressor. With a displacement of 2.6 liters, the supercharger is 52 percent larger than the LT4, but runs at 80 mph, consumes only 1 hp and offers virtually no boost. On the other hand, it needs 110 horsepower to spin its helix rotors with roots up to 15,860 rpm to reach a maximum boost pressure of 13.96 psi near Redline. The LT5 charge air cooler has about twice the heat exchange capacity of the LT4, and there are four new heat exchangers (a total of 13 "radiators") housed here and there. Combining all this with the new "Halo" hood, the ZR1 offers 41 percent more air flow than the Z06, which is notoriously prone to the force-reducing motor protection mode due to overheating. Rest assured, Corvette "Jake" fans, the two ZR1s we had showed no heat issues during our instrumented tests (eight consecutive quarter-mile passes, followed by a dozen laps of our eighth-eight course). Also, we did not lose power with hot laps (two triplets) at Willow Springs Raceway, where we have previously documented issues.

Light the Candle

At Everything Screwed-American push rod motor (which prefers to swallow fuel we can not pump in California with 91 octane) is an optional eight-speed automatic ($ 1,725). In Track mode, enter the Performance Traction Management (PTM) program, select Sport 1, press the brake pedal on the bottom plate, accelerate similarly, wait for the speed to stabilize (at about 1,400 rpm). min) and then release the brakes. This creates a touch of wheel spin that is monitored and controlled throughout the first gear. The best starting rule results were 0-60 by 3.2 to 3.3 seconds and constant quarter miles by 11.2 to 11.4 seconds at 130 mph – and everyone could do this repeatedly. The start control is so good. On the other hand, turning off all electronic aids and using the "best performance" of the driver to steer the wheels comes out a few tenths and a few kilometers per hour. Surprisingly, it's easy to start considering that the engine produces 715 lb-ft of Michelin melting torque. The throttle response is unexpectedly linear, the tires are so talkative that it takes only a few learning trials to find just the right progress between the spinning wheel and the ultimate acceleration. Make no mistake, it can get out of hand quickly, but there's a friendly collaboration that lacks this car, which lacks in, say, a 707-hp, 650-pound-ft Hellcat that just does not bottom out can bring. The ZR1 is remarkable in this way.

Our best efforts resulted in a 0-60 time of 3.0 seconds en route to a 10.8-second 133.1-mph quarter-mile. We were probably a bit behind GM's claims of a 2.9-second 0-60 time and a 10.6-second / 134-mph quarter-mile on account of our 91 and 93-octane fuel , Our ZR1 achieves its best results with its optional ZTK Track Performance package ($ 2,995), which replaces the Michelin Pilot Super Sport ZP (Run-flats) with the sportier Pilot Sport Cup 2 ZP tires. The ZTK package also offers stiffer suspension tuning and greater aerodynamic downforce thanks to a flat undercarriage, a front splitter with end plates and the adjustable "high" wing. This Aero Pack offers 60 percent more downforce than the comparable Level 3 setup in Z06 / Z07. Chevy says it has 950 pounds at top speed (212 mph) networks. They also say that Vmax tests on the freeway emptied the entire tank in 15 minutes. Due to the added downforce / drag of the ZTK we had expected the "low wing car" to run better in a straight line, but instead it came down to the initial tire grip. The high-decker car just got better and stuck in first gear, and that was all she wrote.

It's also about corners

The two fastest Corvettes outperforming our eighth-eighths (Grand Sport and Z06 / Z07) are 22.3 seconds. Our editors often say that the Grand Sport 2017 was the best-balanced Corvette ever, with the grip of the Z06 / Z07, but with the ability to use its power, which the Z06 / Z07 lacks. His impressive round proves this. We expected a similar lap time from the ZR1 duo. However, if we managed to get two howitzers to a knife fight, they could only circling our race track in a bottle in 22.7 and 22.9 seconds. Why? It's just too difficult to use all the power in a parking lot and there are twitches that former Corvettes did not have to suffer. Just a week after the infamous and unlucky Detroit Grand Prix pace car wreck, test rider Kim Reynolds said, "Brakes are killer – you can drop the hammer in the last second, retracting feels like side sucking, but After that, there is a bit more understeer than I would like, Midcorner Grip is great, then the tail goes out, goes out (in third gear), it comes out digitally – jumps out very fast and you have to be very modest on it Enormous power wow, wow, wow. "Aside from the tendency to" walk the tail ", there was not so much lateral grip on the skidpad part. While the Z06 / Z07 weighed 1.17 g and the Grand Sport 1.18 g, the ZR1 pair made 1.07 g and 1.11 g. It does not make a big difference, but everything adds up.

Like a pro

What the ZR1 was built with were records on real racetracks. Luckily we have "the fastest track in the west" and a tame racer. Randy Pobst has set the lap record for production cars in Willow Springs and reset and knows his way around. After setting a production record in a Corvette ZR1 from 2019 in Road Atlanta, he also knows his Corvettes. Has the ZR1 set a new record on the big track? Unfortunately no, but it was faster than the last Z06, which he drove there by a significant 1.3 seconds. The top 5 places currently belong to a 2018 Porsche 911 GT2 RS (1: 21.08), 2018 McLaren 720S (1: 21.75), 2018 Lamborghini Huracán Performante (1: 22.53), 2015 Porsche 918 Spyder (1: 23.54) and 2017 Ford GT (1: 23.69). In sixth place by just 0.01 seconds drove the Chevrolet Corvette ZR1 from 2019 with the ZTK package a 1: 23.70 lap. With Chevrolet on hand to support the effort and three sets of tires sacrificed, it was the best car could do that day. The "low-wing" car was just 1.15 seconds back, his 1: 24.85 finished eleventh overall.

When Pobst was asked to compare the ZR1 with the Z06, he said, "The ride is more forgiving, especially in the most aggressive mode." Brakes are still strong – as always, world class. [ZTK] The wing adds high-speed stability Even the ZR1 without the aerodynamic package is better balanced in high-speed corners [than the Z06/Z07]. "However, he continued in the following words:" While the car has a large power fluctuation [over the Z06]it is still nervous in the lower gears And that's the big downfall of the Vette. "

When asked how the ZR1 coped with the compulsion to drive three or four hot laps in a row, Pobst said," Fortunately, a greatly improved cooling improves both uptime and larger compressor times Intercooler and engine coolant and oil temps to more viable numbers. I saw steady values ​​below 220 for water and below 275 for oil very high, but much better than the numbers of the poor Z06.

Back to Reality

In the city, the ZR1 attracts a lot of people to parking, unsolicited questions from grocery stores, shopping carts, and even more thumbs-up reactions on the road. It's as over-the-top as it comes On the road, the ZTK-equipped ZR1 runs as smoothly as any other C7 Corvette I've ever driven The ZTK is tougher than the RS versions of the Porsche 911 GT2 / GT3 The Chevrolet Corvette ZR1 from the However, 2019 has been several times successful and has failed to set performance records – in fact, it's the fastest to 60 mph and fastest quarterback Miler Corvette we've ever tested on the Dragstrip, the one Z06 / Z07, too combing it with an eight-speed automatic, keeping two feet shorter than the previous best Corvettes (a handful of Grand Sports and Z06s) at 60 mph, outperforming Willow Springs faster than any previous Corvette, but It did not manage to set an absolute record on our sled or beat our eighth list. It's true that the ZR1 is a great achievement, as it costs a whole trunk load of less money than the ones mentioned above (and many below) on the Willow Springs lap times list. At the end of the C7 era, this is as good as possible for a front-engine Corvette. Unless there's a brand-new "lightweight" version or track-only special, there are not any tricks that come to mind to the Corvette engineers. Besides, they all work on replacement of the central engine. In fact, Corvette fans, that's as good as it gets, warts and everything, which means it's the perfect farewell to the C7.

2019 Chevrolet Corvette ZR1 (3ZR) "Low Wing" (1ZR w / ZTK) "High Wing"
BASIC PRICE / TESTED PRICE $ 132,095 / $ 135,210 [19659132] $ 122,095 / $ 131,300
VEHICLE LAYOUT Front engine, RWD, 2-pass, 2-door coupe Front engine, rear, 2-speed, 2-door coupe
ENGINE 6.2L / 755-PS / 715-lb-ft * charged OHV 16-valve V-8 6.2L / 755-hp / 715-lb-ft * charged OHV 16-valve V-8 [19659137] TRANSMISSION 8-speed automatic 8-speed automatic [19659139] CURB WEIGHT (F / R DIST) 3,669 lb (50/50%) 3,650 lb (51/49%)
WHEELBASE 106.7 in 106.7 in
LENGTH x WIDTH x HEIGHT 179.8 x 77.4 x 48.5 in 179.8 x 77.4 x 48.5 in
0-30 1.5 sec. 1, 4 sec.
0-40 2.1 1.9
0-50 2.6 2.4
0-60 [36 3,0
0-70 3,9 3,7
0-80 4,7 4,5
0-90 5,6 5,3
0-100 6,6 6,3 ​​
0-100-0 10.4 9.7
SURVIVAL, 45-65 MPH 1,2 1,2
QUARTAL MILE [[email protected] 10.8 sec @ 133.1 mph
BRAKES, 60-0 MPH 97 ft 88 ft [19659134] SIDE ACCELERATION 1.07 g (Average) 1.11 g (Average)
] MT Figure EIGHT 22.9 sec @ 0.95 g (Avg ) 22.7 sec @ 0.98 g (average)
2.4-MI ROAD COURSE LAP 1: 24.85 1: 23.70 [1 9659137] EPA CITY / HWY / COMB FUEL ECON 20/12/15 mpg 20.12.15 mpg
ENERGY CONS, CITY / HWY 281/169 kWh / 100 Miles 281/169 kWh / 100 miles
CO2 EMISSIONS, COMB 1.365 lb / mile 1.33 lb / mile
* SAE certified

Source link