The Future of the DCT?

[John]

A DCT with 7 clutches? Been there, done that, thanks to Konigsegg. Is this the future of the DCT, to have a clutch for every single gear?

First, our DCT primer thread if someone is wanting a short course on DCT’s.

https://www.midenginecorvetteforum.c...ng-about-a-dct

Make, Model: Koenigsegg Jesko

Top Line: Christian von Koenigsegg has finally unveiled the successor to the record-breaking Agera. Named after Christian's father, Jesko von Koenigsegg, the new car is said to take both internal combustion and automatic transmission technology to all-new heights, capable of a top speed of over 300 miles per hour.

What's New: The Koenigsegg Jesko gets a new engine, specifically a twin-turbo, 5.0-liter, flat-plane crank V-8 producing 1,280 horsepower on regularly available gas or a frankly insane 1,600 hp on E85 biofuel. Developed in-house by Koenigsegg and milled by a small manufacturer located in southern Sweden, the engine is good for 1,106 pound-feet of torque, revs to 8,500 rpm, and supposedly features the world's lightest V-8 crankshaft.

http://www.thedrive.com/news/26777/k...-mph-top-speed










The most interesting part of this so-called "megacar" perhaps is its transmission, a nine-speed multi-clutch unit that Koenigsegg calls a "Light Speed Transmission." Developed and built completely in-house, the LST is supposedly capable of changing between any of its gears in a virtual instant—at Light Speed. While dual-clutch transmissions load up the anticipated, adjacent gear, Koenigsegg's system uses seven clutches, enough to cover all of the gears minus the one you're currently in and first, probably. Theoretically, the driver could go from seventh to second in virtually no time at all.
KOENIGSEGG

Light Speed Transmission
To take advantage of the revolutionary gearbox, the paddles used to change gear are notched. A light press flicks through to the next, single gear as usual but a hard press automatically shifts the car to the most "optimal" gear for something Koenigsegg calls "Ultimate Power On Demand" or UPOD. Sort of like 3D Touch on an iPhone.

[SheepDog]

A Very Sophisticated Toy: The engine, tranny and moving parts have a unique maintaince protocol. Scheduled servicing cost a Porsche $GT3?, a $911? or a $Cayman?. These cars fly business class to the factory for medical care. Charter flight?

Has anyone else ever thought of a DTC with one clutch per gear? I'll do a mini-Google search on that .

Well, this is, maybe, a Septa Clutch Transmission. SCT. I did not see any thing like in the computer on the first page of a Google search. So maybe there is a prior thought . But this is truly a committment to be the best. The engine at 5 liters and 8500 RPM and over a 1000 HP must be an interpretation the Hammer of Thor X 8500.

The Superdouper Aston Martin has an extreame V12 that cranks 11000 RMP and big numbers.

How close will the RedWhitenBlue collar C8 come to these Billionaire cars? The "Don Sherman March 8th Hagerty article" said that the C8 team tested a 900/1000 HP engine in the prototype C8. The extreme twist of the 1000HP engine cracked the glass/plastic view cover that is over the engine. The chassis design was revisited to address that factor. Time. He also said flat plane Crank TwinTurbo for the C8 at the top of the offerings. C8 must have a capable DTC to handle this power.

Therefore the C8 team already has preliminary test information on the acceleration, braking and handling of the prototype at 1000HP. What should one thing about the probabilities of C8 performance, at least, against cars costing ls than 750K$. Just the probabilities and the aero and tech associated with that level of performance. This thing is going to be Awsome.

[Bikerjulio]

Us Vikings are awesome.

(I have a medical condition exclusive to Vikings so just a little biased).

Seriously, this guy is incredible. Even though the cars are super expensive I'd hope he can licence some of the tech coming out of his place, it's so good.

[JB]

I dont believe the rear wing is big enough (sarcasm)

[SheepDog]

KOENIGSEGG's 5.0 Liter is relative large for V8 flat crank. They are usually traditionally smaller displacement.Supposed to be easier to quell the V8 unique vibrations with shorter stroke, 3 inches maybe, lower weight and displacenment. But the Ford voodoo is 5.2. They say it shakes. KOENIGSEGG's 5.0 must have resolved the vibration issues. and 8500RPM must be a short stroke. They say exploding air/gas mixture only expands at a fixed velocity. 60MPH. To get more RPM they must shorten the stroke because the combustion can only push the cylinder heads at the fixed rate of feet per second, which is further impeded if the moving parts are heavier than lighter.

The KOENIGSEGG's 5.0 is kicking the HP. At 1100 plus on pump gas. The pistons, heads, rods, crank and flywheel must be reduced resistance light material. The Valkrie is V12 6.5 liter. 1100Hp. it is like a McLaren 4.0 liter with 4 extra cylinders. but the 11000 RPM is freak and it will probably stay broke and in the shop.

The secret Corvette C8's Flat Plane Crank Will p[ain kick butt: If it's 5.5 liter. If its short stroke, If its twin turbo and boosted up. If the reciprocating parts are lightened. If it cranks to 8500 RPM. Then it will have Valkryie/Jesco levels of raw power. If the curb weight is 3200 minus pounds, then the C8 Vehicle will perform at the 750K/million$ car level. If the C8 flat plane V8 is fully exploited, and they will do that, then this thing is going to be wild. The 720s and 488s will not be competitive. Going to need a good and fast shifter DCT.

If the top C8 comes with the engine configuration described in the preceding paragraph, then C8 Corvette is intended to Rule.

[John]

Thanks you SheepDog. You have nailed the question, and that is, “has Chevy solved the large displacement, flat plane crank, but without NVH issues? Especially because to more than a few on Ford forums, Ford has had some serious warranty issues with their flat plane crank due to those vibrational issues.

So if the rumors of a flat plane crank for thesecond version, Z06 ME are accurate, with most all saying that the motor for that Corvette will be at least 4.2L, and many suggesting 5.5L, GM must have solved the flat plane NVH issues for the Z06 version. Does a short stroke motor assist in GM’s solution — again if they have a flat plane crank as part of the Z06’s motor?

[Milliwatt Rob]

If it had seven clutches, it would be a septuple clutch transmission, or "SCT".

The idea of being able to shift from any gear to any other gear non-sequentially sounds scary. Can you imagine trying to do a downshift from seven to five, and instead going seven to two? Hope some computer prevents that from happening.

[Racer86]

My wife used to downshift from 4th gear to 1st gear entering turn 11 at Sears Point in her single seat open wheel SCCA Formula Ford every lap. Was a thing of beauty to see and hear her do it. Perfect heel and toe technique. Great timing ,as she told others, when they said they would not even try this, her comment to them was,,,, learn how to drive

[John]

If it had seven clutches, it would be a septuple clutch transmission, or "SCT".

The idea of being able to shift from any gear to any other gear non-sequentially sounds scary. Can you imagine trying to do a downshift from seven to five, and instead going seven to two? Hope some computer prevents that from happening.

You will be able to do this on the Corvette’s DCT, e.g., double down or double upshift. Might we be able to do a triple or quad gear jump?

For sure, there are “good nannies” to prevent the double-gear at a time problem..

[MidEngine]

I wonder what the K’s transmission alone cost. $100,000? $150,000?

[meyerweb]

Seems like a lot of added complexity and cost for relatively little real word benefit. When you sell your cars for a million bucks a piece, I suppose the cost doesn't matter, but for mass produced cars? I think it's passed the point of diminishing returns.