Η Chevrolet λέει ότι το 10-τάχυτο κιβώτιο της είναι ταχύτερο από το PDK της Porsche

22:36 11/5/2016 - Πηγή: AutoBlog

Όταν λανσαριστεί στην αγορά αργότερα μέσα στο 2016, η Chevrolet Camaro ZL1 θα είναι το πρώτο αυτοκίνητο της General Motors που θα εξοπλίζεται με το ολοκαίνουριο, 10-τάχυτο αυτόματο κιβώτιο της. Ίσως γι’ αυτό, η Αμερικανική εταιρία αποφάσισε να είναι επιθετική με το marketing της και στοχεύει απευθείας σε ένα κιβώτιο που θεωρείται από πολλούς ως ένα από τα καλύτερα αυτόματα στην αγορά: το PDK της Porsche.

Σύμφωνα

με την Chevrolet, η υπεροχή του Hydra-Matic, 10-τάχυτου, αυτόματου κιβωτίου, οφείλεται κατά κύριο λόγο στην τελική σχέση μετάδοσης -7.39- της μονάδας, κάτι που επιτρέπει στον supercharged V8 των 6.2 λίτρων και των 640 ίππων να διατηρείται μόνιμα μέσα στο ωφέλιμο φάσμα λειτουργίας του. Το “ζουμί” της υπόθεσης όμως, είναι όταν η Chevrolet συγκρίνει το κιβώτιο με το διπλού συμπλέκτη, PDK.

Η μετάβαση από την πρώτη σχέση στην δεύτερη, είναι 36% ταχύτερη απ’ ότι στο PDK ενώ τα ανεβάσματα από την δεύτερη στην τρίτη και από την τρίτη στην τέταρτη, είναι κατά 27% και 26% ταχύτερα αντίστοιχα.

Αναφέρει χαρακτηριστικά η Αμερικάνικη εταιρία. Αν από την άλλη είσαι λάτρης του 3ου πεντάλ, μην ανησυχείς. Η Chevrolet σε έχει καλυμμένο και θα προσφέρει την 2017 Camaro ZL1 και με ένα 6-τάχυτο, χειροκίνητο κιβώτιο. Πάντως εγώ προσωπικά, λατρεύω αυτά τα εταιρικά “trash talk”. Να δούμε, θα πάρει απάντηση από την Porsche;

Δελτίο Τύπου

CAMARO ZL1’S LIGHTNING-FAST TRANSMISSION IS A PERFECT 10

New 10-speed auto offers quicker shifts than DCT, sets new performance standards

DETROIT – With faster upshifts than a dual-clutch transmission and a wider overall gear ratio spread to optimize performance and efficiency, the all-new available Hydra-Matic 10-speed automatic transmission sets a new performance standard in the 2017 Camaro ZL1 – and raises the bar for the segment.

The ZL1 is expected to be the first volume production car to offer a 10-speed automatic. It builds on the established legacy of Hydra-Matic eight-speed transmission family offered on other Gen Six Camaro models, to deliver higher thresholds of capability, refinement and efficiency.

“There is simply nothing like the experience offered with the new 10-speed automatic in the Camaro ZL1,” said Aaron Link, ZL1 lead development engineer. “It delivers nearly instantaneous, lightning-fast shifts that alter your perception of what an automatic transmission can offer in a high-performance vehicle – whether you’re on the street, drag strip or road course.”

The greater overall performance and efficiency are due primarily to the 10-speed’s wider 7.39 overall gear ratio spread, which enhances off-the-line performance with an aggressive first gear ratio of 4.70. Smaller steps between the gears also help the engine maintain the optimal speed for maximum power at almost all vehicle speeds, especially when exiting a corner on a track.

“The gear ratios are so tightly spaced that the transmission is in the right gear and the engine is at the best rpm for transitions from corners to straights,” said Link. “And with the power from the ZL1’s supercharged LT4 engine, the force you feel in your seat as you accelerate out of a turn will put a grin on your face every time.”

Chevrolet testing has shown the ZL1 with the available 10-speed has faster shift times than the Porsche PDK dual-clutch transmission. In fact, the 1-2 upshift is 36-percent quicker than the PDK, while the 2-3 and 3-4 upshifts are 27-percent and 26-percent quicker, respectively.

“You touch the paddle and the gear changes with immediacy,” said Link. “The shifts happen so quickly and without delay that it almost feels like an extension of your reflexes. It’s a much more involving experience for the driver that really helps improve confidence and performance on the track.”

Hundreds of hours were spent integrating the 10-speed’s shift performance with the unique power band of the ZL1’s supercharged 6.2L LT4 engine, which is estimated at 640 horsepower and 640 lb-ft of torque.

The 10-speed also has a numerically lower top gear ratio than Camaro’s eight-speed automatics, which allows the engine to run at a lower speed on the highway, enabling even greater efficiency.

Creative packaging

Creative packaging solutions, which had to accommodate another clutch in comparison to the eight-speed, allow the 10-speed to be the approximate size of Camaro’s other eight-speed transmission. It uses four simple gearsets and six clutches: two brake clutches and four rotating clutches. That’s only one more clutch than the eight-speed, despite having two more forward gears.

It is also the latest transmission with an all-new, proprietary electronic control system and performance calibrations. The calibration is unique for the ZL1’s high-performance-oriented driving experience, while additional applications will feature calibrations matched to their respective performance ranges.

Additional highlights:

A reduction in spin losses, thanks to only two non-applied clutches and other design features, contributes to greater fuel efficiencyNew ultra-low viscosity transmission fluid reduces friction across the full temperature operating range for greater fuel efficiencyAn internal thermal bypass allows the transmission to warm up faster to its optimal operating temperature for additional fuel efficiencyAdvanced torque converter design contributes to packaging efficiency.

The 10-speed will be produced with an all-new manufacturing system at GM’s propulsion manufacturing facility in Romulus, Mich. It’s part of a $323-million investment in the facility, which employs 850 hourly and salaried workers.

Founded in 1911 in Detroit, Chevrolet is now one of the world’s largest car brands, doing business in more than 115 countries and selling more than 4.0 million cars and trucks a year. Chevrolet provides customers with fuel-efficient vehicles that feature engaging performance, design that makes the heart beat, passive and active safety features and easy-to-use technology, all at a value. More information on Chevrolet models can be found at www.chevrolet.com.