Business And Car Review Chevrolet Corvette Stingray Eight-Speed Automatic 2015

2015 Chevrolet Corvette Stingray coupe
The race to higher gear counts is inward sum swing, as well as automatic gearboxes are leading the way. Driven partly past times marketing one-upmanship as well as partly past times the ask to come across ever-tougher fuel-economy mandates, eight-speed autoboxes are everywhere, Chrysler’s running a nine-cogger inward remove models, as well as 10-speeds—from Ford, GM, Volkswagen, as well as others—are simply to a greater extent than or less the corner. The General’s ain in-house-developed eight-speed units (for its trucks as well as rear-drive V-8 cars) are simply making an appearance later run on them had all but stopped during the company’s plunge into bankruptcy inward 2009.
Now the Corvette gets updated alongside its rear-axle-mounted version of this novel eight-speed automatic. Why is this news? While we’re theatre believers that manual transmissions all the same render a higher as well as to a greater extent than nuanced degree of organic driver interest as well as control, it’s no hole-and-corner that high-performance cars are oft faster as well as quicker during boundary testing when equipped alongside the automatic gearboxes. Ferrari as well as Lamborghini bring gone entirely to automatics, as well as the novel Porsche 911 GT3 as well as the 911 Turbo are automatic-only. One mightiness tell that Chevrolet is taking a page from the Porsche playbook past times fifty-fifty offering an automatic inward the forthcoming Z06—a model that had been express to manual-transmission offerings inward the past. Its supercharged LT4 small-block V-8, alongside 650 horsepower as well as 650-lb-ft of torque, volition locomote the most powerful engine General Motors has ever produced. So don’t mean value of an automatic, fifty-fifty if it is a to a greater extent than mutual planetary-gear type rather than the to a greater extent than exotic dual-clutch variety, equally a handicap the Z06 must suffer.

Gears With Benefits

How tin nosotros locomote thence sure? Chevy hasn’t shown us a running Z06 inward the flesh, but the fellowship did allow us sample the novel eight-speed automatic inward the 2015 Stingray as well as Chevy claims that the novel ’box is quicker inward a direct business than the manual. We discovered that the former six-speed auto was quicker than the manual version alongside private tests of Stingray convertibles, but knocking some other 10th off of the zero-to-60-mph as well as quarter-mile times puts the estimated times of the eight-cog Vette perilously unopen to those recorded for the C6 ZR1 inward the kickoff metric as well as nearly into the 11-second attain inward the second.
The novel GM 8L90 eight-speed automatic, which volition likewise larn to run inward the 2015 full-size trucks as well as SUVs equipped alongside the 6.2-liter V-8, doesn’t hamper the fun 1 bit. On a route course, taking hot laps inward an automatic that performs ignition-spark-cutting upshifts as well as positive-torque downshifts (engineer jargon for blipping the throttle to check revs) quicker than humanly possible allows the driver to concentrate on the steering as well as braking, potentially turning quicker laps inward the process. Plus, from our seat-of-the-pants perspective, the GM 8L90 shifts equally apace equally whatever dual-clutch unit of measurement available. Corvette engineers benchmarked the ZF’s dual-clutch automatic that goes into the Porsche 911 as well as claim the novel GM ’box genuinely shifts quicker inward some cases.

Goin’ With the Flow

Several laps of GM’s Milford Road Course revealed that the transmission programing inward good-old “D” alongside the car’s Performance Traction Management switched on is pretty adept for rail duty. It’ll agree gears upward to redline, downshift past times itself simply equally 1 mightiness make piece tapping the steering-wheel paddles, as well as automatically upshift when it should. Influenza A virus subtype H5N1 two-three midcorner upshift doesn’t upset the chassis equally it mightiness alongside a manual transmission because the torque period of time at gearchanges is smoother. We’re non proverb the automatic is to a greater extent than fun to drive than the seven-speed manual, but don’t locomote surprised if the side past times side Corvette nosotros set on a racetrack has an automatic.
GM wouldn’t confirm whether the automatic Corvette is quicker on the track, but the Z51-equipped cars are sure enough built for it; they volition lap continuously for a sum tank of fuel without overheating. When the 8L90 goes into the Z06, it’ll bring 2 transmission coolers—one inward the hindquarters, equally alongside regular Stingrays, as well as some other further upward the chassis laying apartment on the underbelly.
Through ample occupation of aluminum as well as fifty-fifty some magnesium (a kickoff for GM automatics), the novel 8L90 weighs 8 pounds less than the six-speed 6L80 it replaces, thence curb weights should non increment for 2015. The novel transmission gets its 8 ratios, alongside a 7.02:1 spread, from iv unproblematic planetary gearsets as well as v clutches, iii of which are e'er closed for increased efficiency. And speaking of efficiency, Chevy says it missed its finish of achieving a 30-mpg EPA highway rating past times the narrowest of margins—one hundredth of a mpg. Corvette main engineer Tadge Juechter says GM volition retest the automobile side past times side yr alongside an extra 2 psi inward the tires inward an travail to accomplish the 30-mpg label. That’ll require Chevy to alter the recommended pressure level on the door-frame placard as well as as well as thence impress inward the owner’s manual that it is okay to run at a lower pressure level for “comfort.” That’s a play tricks Porsche’s been doing for years.
Watch this infinite for a sum exam of the eight-speed-automatic 2015 Stingray equally before long equally nosotros tin claw upward our gear to one. All that utter nearly some other mile per gallon is nice, but we’ll allow yous know if our prediction of a 0.1-second quicker zero-to-60 fourth dimension compared alongside that of our concluding exam of a six-speed automatic Vette—down to 3.6 seconds—pans out.
 
BY: K.C. COLWELL || MULTIPLE PHOTOGRAPHERS

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