The c8 dct same as mclarens shifts so fast it cant be measured

[JB]

The c8 dct built by same vendor as mclarens 720 dct is so fast in shifting it cant be measured.

The McLaren 720S Shifts Too Fast To Measure

BY CARSCOOPS STAFF | POSTED ON NOVEMBER 13, 2018

With 710 horsepower (or 530 kW) and 568 lb-ft (770 Nm) of torque on tap, and all the technology that one of the world’s leading racing constructors can throw behind it, there was never any question that the McLaren 720S would be fast.

It’ll run to 62 mph (100 km/h) in under three seconds and top out at 212 mph (341 km/h), according to the manufacturer. But just how fast does its transmission shift gears?

That’s precisely what this latest video review aims to find out. And that, as it turns out, may have been a task more difficult than originally anticipated.

The 4.0-liter twin-turbo V8 in the 720S comes mated to a seven-speed dual-clutch gearbox that McLaren calls “seamless-shift,” and with good reason. The quick-shifting transmissions in supercars like this are known to swap cogs in a matter of milliseconds – even quicker than the previous (and more hardcore) 675LT, and far quicker, at any rate, than even a professional driver could row an old-school manual, and more than a match for the rest of the supercar’s capabilities.

To measure just how quick McLaren’s gearbox can shift, Jason Fenske of Engineering Explainedbrought along a highly precise VBox DataLogger telematics device, which draws data from an array of satellites to measure with pinpoint accuracy a vehicle’s performance. The idea was to see where along the acceleration curve the gearbox was switching sprockets. But as you can see from the ten-minute segment, the McLaren proved faster than the data-logger could measure. Which is pretty **** impressive, if you ask us.

https://www.carscoops.com/2018/11/mc...-fast-measure/

[John]

For many commentators, however, McLaren’s seven-ratio SSG (for Selective Shift Gearbox) stands as the most accomplished transmission on offer. Supplied by Oerlikon Graziano in Italy, the SSG has been systematically honed since 2011 to reach new levels of smoothness, sophistication and driver enjoyment.

https://www.lubrizoladditives360.com...-equipped-dct/

[John]

Many believe that the DCT transmission in the 2020 ME Corvette will be made by Oerlikon Graziano, the parent company of ZF DCT. However, other rumors are that the Corvette ME’s will instead be made by Tremec (the maker of the 7M for the C7). Both are excellent transmission companies, and until the reveal, it is unlikely we will definitively know which one is in the C8. What we do know is that both are in the same shifting speed ballpark, and thus by watching the video we can see how fast the DCT will shift in the 2020 ME Corvette — regardless of which company is its manufacturer.

Thank you so much JB for bringing the article and the video to our attention. I just included this thread in our earlier, stickied, master, one, “Learning About A DCT.”

[MidEngine]

Thank you JBsC6. I sure can not shift in many times that amount of time.

[AbqVic]

Wow! Just watched the video. That’s really impressive! Thank you JBsC6 for finding and posting it. I’m going to eat a crow dinner now and take back everything I ever said about preferring a torque converter over a DCT.

[Fireeagle]

Great article and video. As someone that has owned both manuals and automatics over the years, I'm really liking the paddle shifting autos. Having the best transmission will be a great plus for the C8.

[Keagan-Z06]

Sheesh. Talk about blistering quick.

[meyerweb]

Tremec bought a Belgian company that manufactures DCTs. It seems likely that's what'll end up in the C8, but who knows:

http://www.tremec.com/noticias_detal...ology-leader-/

Mexico City, January 12, 2012 - Grupo KUO, SAB de CV (BMV: KUO), through its subsidiary TREMEC, acquired the business of high-tech automotive design and development organization HOERBIGER Drivetrain Mechatronics BVBA located in Loppem, Belgium. HOERBIGER products and software solutions are found in leading European sports cars, including Ferrari Italia 485, AMG SLS and McLaren MP4-12C.

In 2010, the acquired business had sales of approximately $US 17 million. Among its clients are leading manufacturer of transmissions in Europe.

Compared with conventional manual and automatic transmissions, DCT systems are characterized by higher comfort shifting gears in a faster acceleration and efficiency of the fuel.

"This acquisition will allow Grupo KUO to accelerate its entrance into DCT systems and allow us to pursue new market segments with high growth," said Juan Marco Gutiérrez Wanless, CEO of Grupo KUO.

HOERBIGER lists the following as customers, but I can't tell if they use the company's DCTs or other technologies:

Alfa Romeo
Ford Mustang
Mercedes Benz
VW
GM

[Bikerjulio]

The transmission is not literally "swapping cogs". The term indicates a misunderstanding.

It is a preselector trans. It would be accurate to say "swapping clutches" which can be done almost instantaneously.

[John]

Thanks Bikerjulio. Good catch on your part.

[meyerweb]

I would guess this transmission shares at least some of its technology with McLaren's F1 gearbox. How fast do F1 gearboxes shift? Can you believe 8 ms? That's 8 one thousandths of a second. 0.008 seconds.

How fast is that? An eyeblink takes 300 - 400 ms. A Lamborghini Aventador, about 45 ms.

https://www.quora.com/What-is-the-ge...-car-presently

F1 gearboxes could actually shift faster, but the rules mandate there be a measurable gap between gears. F1 teams built gearboxes in the past which actually had two gears engaged in overlapping fashion during shifts, so the shift time was essentially 0.