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CorvetteToday Podcast Delves Into C4 With Aficionado Brad Hansen

CORVETTE TODAY delves into the C4 Corvette with affectionato, Brad Hansen. https://podcasts.adorilabs.com/corve...I0r3Da0OXhSCLC Brad is a LA videographer, but uses his C4 as a Daily Driver. Consequently, he has become a true go-to guy for all C4 do-it-yourselfers! Brad has a great YouTube channel and social media presence. You'll find out all about that and more on this episode of CORVETTE TODAY!

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C8 Same DCT As Porsche 918’s

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  • C8 Same DCT As Porsche 918’s

    Darn good question just raised by Road & Track. Personally, I think they have found a gold nugget, so here it is for your analysis.

    Thanks CorvetteBlogger for bringing this to our attention!

    Originally posted by Road&Track
    The Mid-Engine Corvette's Gearbox Might Be Related to the Porsche 918's

    A little educated speculation has led us to an unlikely conclusion for the origin of the next Corvette's dual-clutch gearbox.

    BY BOZI TATAREVIC

    BESPOKE AUTOMOTIVE MEDIA

    Earlier this year, we discovered the possibility of a Tremec 7-speed dual clutch transmissiongoing into the next generation Corvette, but recent leaks show that the mid-engine Chevy might get something even more exotic. Documents that appear to be part of an order guidefor the C8 Corvette shows that it will be equipped with an 8-speed dual clutch transmission. That puts the Tremec box out of contention.

    There are not many 8-speed dual clutch transmissions currently available that can be used in a mid-engine configuration and handle the Corvette's massive torque, but the new ZF 8DT, which recently hit the market in a variety of VW products including the Porsche Panamera and Bentley Continental, could be a good match for the new Corvette. This is a replacement for its 7-speed predecessor, the 7DT, which was installed in the Panamera, 911, and, perhaps most interestingly, the 918 Spyder.

    Click image for larger version  Name:	E4CBA133-1DFC-4E59-B5C7-CF18FB7D7FEB.jpeg Views:	1 Size:	67.9 KB ID:	31277
    Above, the ZF 8DT ZF

    That's because the 918 has an engine and transmission configuration that is similar to leaked CAD drawings of the mid-engine Corvette. They show a clear match between the ZF 7DT-75 that was installed in the Porsche 918 and the gearbox on in the upcoming Corvette. The case on the transmission in the CAD image appears to be very similar if not the same as the 918 with the upper mount located in the same position.

    Click image for larger version  Name:	1071C0A6-9397-444A-AE56-86C4B80C3735.png Views:	34 Size:	362.1 KB ID:	31278
    The 918’s gearbox, left, is a solid match for the new Corvette, right. .

    Using the 8DT also opens up an easier path for a potential hybrid variant. It was designed to be easily adaptable to hybrid applications with a compact electric motor that can be installed directly into the housing. They’ve already deployed a hybrid version in the Panamera e-hybrid, using ZF's 100 Kw hybrid module.

    Although an 8DT has not been shown with a similar case yet, ZF has stated that one of its advantages is that it is configurable for multiple applications. That means it is likely that they can reconfigure the new transmission much like they did with the 7DT in the 918 Spyder. This transmission might seem a little too exotic for the Corvette at first, but it is planned for use in a variety of applications. Its predecessor was fairly common and was used in a variety of Porsches. The main difference in the 918's variant versus the others is some custom gears. It was also rotated 180 degrees to improve packaging and the center of gravity.

    According to ZF's website, the 8DT is rated for a maximum of 738 lb-ft of torque, which is likely plenty for the speculated LT2 base engine of the upcoming Corvette. It should even be enough for higher trim levels. The current top engine choice in the Corvette, the LT5 in the ZR1, produces 715 lb-ft of torque.

    We reached out to ZF and GM to verify the information and a representative for GM stated that they do not comment on potential future production plans while a representative for ZF stated that they do not discuss future plans of customers.
    https://www.roadandtrack.com/new-car...x-speculation/
    Last edited by John; 04-03-2019, 05:30 PM.
    GBA Black; HTO Twilight/Tension interior; Z51 & Mag Ride; E60 lift; 5VM visible carbon fiber package; 5ZZ high wing; FA5 interior vis CF; ZZ3 engine appearance; 3LT; Q8T Spectra Gray Tridents; J6N Edge Red Calipers; SNG Edge Red Hashmarks; VQK Splash Guards; RCC Edge Red engine cover; VJR illuminated sill plates. Lifetime, annual contributors, and 23 year members of National Corvette Museum. Home is the beautiful Pacific Northwest.

  • #2
    A little 918 pictorial re-visit thanks to YouTube.

    Click image for larger version  Name:	405BAE44-83D7-49B8-BE0C-E93C33A15D77.jpeg Views:	26 Size:	701.5 KB ID:	31280
    Last edited by John; 04-03-2019, 05:29 PM.
    GBA Black; HTO Twilight/Tension interior; Z51 & Mag Ride; E60 lift; 5VM visible carbon fiber package; 5ZZ high wing; FA5 interior vis CF; ZZ3 engine appearance; 3LT; Q8T Spectra Gray Tridents; J6N Edge Red Calipers; SNG Edge Red Hashmarks; VQK Splash Guards; RCC Edge Red engine cover; VJR illuminated sill plates. Lifetime, annual contributors, and 23 year members of National Corvette Museum. Home is the beautiful Pacific Northwest.

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    • #3
      awesome!
      This really makes sense, and glad to know it will be able to take a large amount of torque.
      Sigmon - Hamilton, Ohio, USA
      2021 Elkhart Lake Blue Stingray coupe, Adrenaline red 3LT Z51, D30, BV4, E60, EYK, FA5, FE4, Q8T, ZZ3, J6N
      Deposit: March 20/20, 1100: Nov 17/20, 2000: Feb 12/21, 3000: Feb 17/21, 3300: April 15/21, 3400: April 23/21 TPW 5/3/21, 3800: 5/4/21, 4200: 5/10/21, 5000: 5/10/21, 6000: 5/10/21

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      • #4
        Originally posted by John View Post
        A little 918 pictorial re-visit thanks to YouTube.

        Click image for larger version Name:	405BAE44-83D7-49B8-BE0C-E93C33A15D77.jpeg Views:	26 Size:	701.5 KB ID:	31280
        Dear Santa, I will have one of the Porsche 918's as pictured above please and thank you!

        Comment


        • #5
          maybe it makes sense for GM to use a DCT from ZF, a premier performance transmission supplier. their combined engineering and manufacturing expertise may avoid some warranty expense for GM. they don't always have to design and manufacture in house just to save some small % on cost.

          Comment


          • #6
            Originally posted by conmax View Post
            maybe it makes sense for GM to use a DCT from ZF, a premier performance transmission supplier. their combined engineering and manufacturing expertise may avoid some warranty expense for GM. they don't always have to design and manufacture in house just to save some small % on cost.
            No they don’t. I was told they only make about 20% of their parts in house.
            There is a madness to my method!

            2015 Z06 Torch/adrenaline
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            79 coupe Silver/oyster
            All one owner
            Museum lifetime members

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            • #7
              Additionally, ZF, as we learned from Skank, has a lot of related component systems that seamlessly integrate with their other products, e.g., four wheel steering, magnetorheological engine mounts, and more. While these latter items could well not be found in the 2020 ME, they sure would be a candidates for the Z06+ versions.
              GBA Black; HTO Twilight/Tension interior; Z51 & Mag Ride; E60 lift; 5VM visible carbon fiber package; 5ZZ high wing; FA5 interior vis CF; ZZ3 engine appearance; 3LT; Q8T Spectra Gray Tridents; J6N Edge Red Calipers; SNG Edge Red Hashmarks; VQK Splash Guards; RCC Edge Red engine cover; VJR illuminated sill plates. Lifetime, annual contributors, and 23 year members of National Corvette Museum. Home is the beautiful Pacific Northwest.

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              • #8
                The porsche 918 is a hell of a sports car supercar etc...but for so e reason and it might its pricetag...but it might be its hybrid technology as well...

                im not sire which...

                i am glad to hear the bulletproof 8 speed dct is possibly in the lineup for the c8 although I do hope the costs were able to come down a bit with corvette like unit volumes...

                i cant imagine anything porsche offers is inexpensive....much less something from the supercar [email protected] well as the pricey panamera....

                Comment


                • #9
                  Earlier this year, we discovered the possibility of a Tremec 7-speed dual clutch transmission going into the next generation Corvette, but recent leaks show that the mid-engine Chevy might get something even more exotic. Documents that appear to be part of an order guide for the C8 Corvette shows that it will be equipped with an 8-speed dual clutch transmission. That puts the Tremec box out of contention.
                  The maker of the transmission has been the subject of much discussion for over a year now, and I really don't have a dog in this fight. There is evidence on both sides.

                  There's a couple of things about this piece of "journalism" that irked me.

                  Firstly since at least May of 2018 when C&D stated it was to be an 8-speed DCT trans, that's been pretty much accepted. So I question this "discovery of a 7-speed" that the writer claims. Probably discovered on some forum.

                  Even more ludicrous is the logic behind the assertion that since Tremec currently only advertise a 7-speed, they couldn't possibly make an 8-speed.
                  2020 C8 Corvette.D.O.B 2/03/2020
                  Shadow Grey Metallic on Black
                  2LT, Z51 + MRC. GT1 seats.
                  Spectra Grey Tridents.
                  Carbon flash mirrors and spoiler.

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                  • #10
                    For a new model car with many new systems and components, I would have 100% confidence in a ZF sourced DCT. Far more than a Tremec DCT. Has Tremec ever made a production DCT? If yes, what car uses it?

                    Comment


                    • #11
                      Originally posted by Milliwatt Rob View Post
                      For a new model car with many new systems and components, I would have 100% confidence in a ZF sourced DCT. Far more than a Tremec DCT. Has Tremec ever made a production DCT? If yes, what car uses it?
                      http://www.tremec.com/noticias_detal...ology-leader-/
                      KUO Group (TREMEC) acquires Dual Clutch Transmissions technology 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.
                      I've got no problem with the ZF tranny, but there has been a lot of discussion about the C8 DCT being a TREMEC unit, and TREMEC has a pair of DCTs that are (were?) slated for the US market in 2020+...

                      The Mustang GT500 and Mid-Engine Corvette Might Share Gearboxes
                      Last edited by Mobius; 04-04-2019, 08:30 AM.
                      My C8:
                      '20 Elkhart Lake Blue 2LT Coupe, Natural Interior, GT2 Two-Tone Seats, Performance Exhaust, Front Lift, Carbon Flash Wheels, Engine Appearance Package 2000 Status December 27, 2019; 3000 Status January 2, 2020; 3400 Status March 10, 2020;TPW March 16, 2020; Built June 4th, 2020 (COVID-19); Delivery July 1, 2020

                      Current Vettes:
                      '68 Lemans Blue 327/350 Convertible
                      '91 Turquoise Convertible with Hardtop
                      '14 Lime Rock Green 2LT Convertible, Black Top, Kalahari, 7-Speed, Performance Exhaust

                      Comment


                      • #12
                        i just looked it up and confirmed the Mustang GT 500 will have a seven speed DCT (per R&T), so that previous article making that comparison of sharing gearboxes did not turn out to be,e.g., seven does not equal eight. Sure does not break my heart that the Corvette has one additional gear, whether that gear is used for acceleration, fuel economy or both.
                        Last edited by John; 04-04-2019, 09:14 AM.
                        GBA Black; HTO Twilight/Tension interior; Z51 & Mag Ride; E60 lift; 5VM visible carbon fiber package; 5ZZ high wing; FA5 interior vis CF; ZZ3 engine appearance; 3LT; Q8T Spectra Gray Tridents; J6N Edge Red Calipers; SNG Edge Red Hashmarks; VQK Splash Guards; RCC Edge Red engine cover; VJR illuminated sill plates. Lifetime, annual contributors, and 23 year members of National Corvette Museum. Home is the beautiful Pacific Northwest.

                        Comment


                        • #13
                          Personally I’d prefer it’s a ZF mostly for the fact that they have the best reputation for making fantastic and reliable DCTs. But as long as the transmission is outsourced to ZF or Tremac and not an “in-house” build I think it’ll be the best for us.

                          Comment


                          • #14
                            Originally posted by John View Post
                            i just looked it up and confirmed the Mustang GT 500 will have a seven speed DCT (per R&T), so that previous article making that comparison of sharing gearboxes did not turn out to be,e.g., seven does not equal eight. Sure does not break my heart that the Corvette has one additional gear, whether that gear is used for acceleration, fuel economy or both.
                            I wonder how difficult would it be for Tremec to offer their DCT in both 7 and 8 speed variants? And what would be the purpose? Why would Ford demand fewer gears than the DCT already developed for GM?

                            Something doesn't add up. The info on Tremec's DCT seems solid and it's a certainty that they wouldn't develop a DCT solely for Ford's low volume GT500. It's also very uncharacteristic of GM to use a high end ZF transmission, though they do use other ZF products, such as the Alpha platform steering rack.

                            Comment


                            • #15
                              electroVette, really good points you have made.
                              GBA Black; HTO Twilight/Tension interior; Z51 & Mag Ride; E60 lift; 5VM visible carbon fiber package; 5ZZ high wing; FA5 interior vis CF; ZZ3 engine appearance; 3LT; Q8T Spectra Gray Tridents; J6N Edge Red Calipers; SNG Edge Red Hashmarks; VQK Splash Guards; RCC Edge Red engine cover; VJR illuminated sill plates. Lifetime, annual contributors, and 23 year members of National Corvette Museum. Home is the beautiful Pacific Northwest.

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