Automatic transmission
Melting Slicks
Joined: Dec 2007
Posts: 2,886
Likes: 1,255
From: Carmel CA
Lets get one thing straight here. Any DCT out there is much slower than a Zeroshift transmission. If any of the transmission guru's on this forum could check out the possibility or probability of the Zeroshift technology being adapted to the 8L90 transmission that would be great. While all the DCT fans are touting the virtues of a 100 millisecond shift time, a Zeroshift is 0. I've seen zeroshift in action on the Honda and Ducati Moto GP bikes and it's dominant. Zeroshift is currently working on some hypercar transmissions. As their web site indicates, there wouldn't be any DCT's on the market had the Zeroshift transmission made it to market first. A DCT was developed by Ferrari early on than enhanced by the various (Porsche, BMW,etc.)companies later. The Zeroshift company is in the heart of Formula 1 country in Milton Keynes. Amazing transmission that would render a DCT obsolete.
http://www.zeroshift.com/
http://www.zeroshift.com/
Team Owner
Joined: Sep 1999
Posts: 41,732
Likes: 1,718
From: Springfield MO
Lets get one thing straight here. Any DCT out there is much slower than a Zeroshift transmission. If any of the transmission guru's on this forum could check out the possibility or probability of the Zeroshift technology being adapted to the 8L90 transmission that would be great. While all the DCT fans are touting the virtues of a 100 millisecond shift time, a Zeroshift is 0. I've seen zeroshift in action on the Honda and Ducati Moto GP bikes and it's dominant. Zeroshift is currently working on some hypercar transmissions. As their web site indicates, there wouldn't be any DCT's on the market had the Zeroshift transmission made it to market first. A DCT was developed by Ferrari early on than enhanced by the various (Porsche, BMW,etc.)companies later. The Zeroshift company is in the heart of Formula 1 country in Milton Keynes. Amazing transmission that would render a DCT obsolete.
http://www.zeroshift.com/
http://www.zeroshift.com/
Team Owner
Joined: Sep 1999
Posts: 41,732
Likes: 1,718
From: Springfield MO
Because the Audi's engine puts out more torque than Audi's dual-clutch seven-speed gearbox can handle, the RS7 uses an eight-speed automatic with a torque converter to put it's 560 HP and 516 lb-ft of torque to the pavement while accelerating it's porky 4,475 pounds to a 0-60 in 3.5 seconds and taking 11.6 seconds to run 1320 feet.
I would say the above it a good reason why a 585 HP/560 lb-ft Z06 would use a automatic transmission.
I would say the above it a good reason why a 585 HP/560 lb-ft Z06 would use a automatic transmission.
Safety Car
Joined: Feb 2002
Posts: 3,799
Likes: 0
From: GA (some days)
On the other hand the 991 Turbo S uses a 7-speed PDK transmission to put its 560 HP and 553 lb-ft of torque (with overboost) to the pavement.
Team Owner
Joined: Sep 1999
Posts: 41,732
Likes: 1,718
From: Springfield MO
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Racer
Joined: Nov 2008
Posts: 342
Likes: 0
From: Vancouver BC
Auto for track junkies that only care about lap time / e.t., and manuals for canyon runners that blip and shift simply for the joy of doing so?
As far as DCT vs traditional auto, I too prefer the auto. While a DCT can be built strong (modded GTRs), a well designed 8 spd auto can be stronger and lighter, and shift just as quick, with better road manners.
Team Owner
Joined: Sep 1999
Posts: 41,732
Likes: 1,718
From: Springfield MO
How 'bout both?
Auto for track junkies that only care about lap time / e.t., and manuals for canyon runners that blip and shift simply for the joy of doing so?
As far as DCT vs traditional auto, I too prefer the auto. While a DCT can be built strong (modded GTRs), a well designed 8 spd auto can be stronger and lighter, and shift just as quick, with better road manners.
Auto for track junkies that only care about lap time / e.t., and manuals for canyon runners that blip and shift simply for the joy of doing so?
As far as DCT vs traditional auto, I too prefer the auto. While a DCT can be built strong (modded GTRs), a well designed 8 spd auto can be stronger and lighter, and shift just as quick, with better road manners.
Melting Slicks
Joined: Dec 2007
Posts: 2,886
Likes: 1,255
From: Carmel CA
Sam, I'm still holding out on the NA 427 as that was what I was told by a pretty good source. The latest spoof on the Jalopnik site had a slightly twisted cant of the same info.
http://jalopnik.com/an-exclusive-ins...tte-1481913886
http://jalopnik.com/an-exclusive-ins...tte-1481913886
Melting Slicks
Joined: Dec 2007
Posts: 2,886
Likes: 1,255
From: Carmel CA
Joe, I was wondering how it could relate to Corvettes existing transmissions. I wonder if the Vette engineers have analyzed the Zeroshift technology which is brilliant. Corvette could leapfrog the DCT's with this.
Team Owner
Joined: Sep 1999
Posts: 41,732
Likes: 1,718
From: Springfield MO
I can see that happening before I can see a DCT going into the Corvette since the existing Tremec is already tooled(other than the Zeroshift components).
They could get the increased performance of zero millisecond shifting but retain the efficiency and fuel economy of the manual without having to retool much of the drivetrain in order to use a DCT.
Melting Slicks
Joined: Dec 2007
Posts: 2,886
Likes: 1,255
From: Carmel CA
Reading Zeroshift's website, it appears that they are selling rights to use their technology and that existing manual transmissions can be easily re-engineered to a Zeroshift design.
I can see that happening before I can see a DCT going into the Corvette since the existing Tremec is already tooled(other than the Zeroshift components).
They could get the increased performance of zero millisecond shifting but retain the efficiency and fuel economy of the manual without having to retool much of the drivetrain in order to use a DCT.
I can see that happening before I can see a DCT going into the Corvette since the existing Tremec is already tooled(other than the Zeroshift components).
They could get the increased performance of zero millisecond shifting but retain the efficiency and fuel economy of the manual without having to retool much of the drivetrain in order to use a DCT.
Burning Brakes
Joined: Jan 2005
Posts: 968
Likes: 2
From: Camp Casey Korea/Austin Tx
Lets get one thing straight here. Any DCT out there is much slower than a Zeroshift transmission. If any of the transmission guru's on this forum could check out the possibility or probability of the Zeroshift technology being adapted to the 8L90 transmission that would be great. While all the DCT fans are touting the virtues of a 100 millisecond shift time, a Zeroshift is 0. I've seen zeroshift in action on the Honda and Ducati Moto GP bikes and it's dominant. Zeroshift is currently working on some hypercar transmissions. As their web site indicates, there wouldn't be any DCT's on the market had the Zeroshift transmission made it to market first. A DCT was developed by Ferrari early on than enhanced by the various (Porsche, BMW,etc.)companies later. The Zeroshift company is in the heart of Formula 1 country in Milton Keynes. Amazing transmission that would render a DCT obsolete.
http://www.zeroshift.com/
http://www.zeroshift.com/
Read about in a Race Engineering magazine awhile ago and seems to be proven. Apparently the Big Car companies are not ready to jump on the Zeroshift technology and I'm not sure why not. Seems like that technology solves any performance question.Maybe they need to improve how they demonstrate/(smooze) the Big companies R&D Dept's or maybe they are asking for too high a price Licensing their tech?
Regardless of the reason/reasons why it has not arrived on a production car yet, I would LOVE to see Zeroshift on the Corvette.
Melting Slicks
Joined: Dec 2007
Posts: 2,031
Likes: 4
From: Ottawa
Reading Zeroshift's website, it appears that they are selling rights to use their technology and that existing manual transmissions can be easily re-engineered to a Zeroshift design.
I can see that happening before I can see a DCT going into the Corvette since the existing Tremec is already tooled(other than the Zeroshift components).
They could get the increased performance of zero millisecond shifting but retain the efficiency and fuel economy of the manual without having to retool much of the drivetrain in order to use a DCT.
I can see that happening before I can see a DCT going into the Corvette since the existing Tremec is already tooled(other than the Zeroshift components).
They could get the increased performance of zero millisecond shifting but retain the efficiency and fuel economy of the manual without having to retool much of the drivetrain in order to use a DCT.
This machining of stock transmission gears coupled with an air shifter and an electronic controller which activated the air shifter at preselected rpm made for what was a completely automatic transmission once you dropped the clutch. The only drawback to the technology back then was IF you slammed the throttle shut without first disengaging the clutch, the force of the rear wheel driving the transmission (instead of the trans driving the rear wheel) would destroy the transmission. This could have been resolved through some kind of free-wheeling mechanism but there wasn't enough demand to develop such a thing.
Generally getting the clutch pulled in before shutting the throttle wasn't a big deal, but of course this was a little harder to get timed correctly IF you got completely out of shape and were mostly concerned with regaining control and not crashing
Cheers, Paul.
Melting Slicks
Joined: Jul 2010
Posts: 2,618
Likes: 20
From: Elk Grove Village
St. Jude Donor '12
I doubt id buy another car with a manual transmission. I get absolutely no joy in driving it living so close to Chicago. If they came out with a DCT or something similar, id seriously consider it. Time GM brought the Corvette into the 21st century.
Instructor
Joined: Sep 2010
Posts: 155
Likes: 0
From: Milton Georgia
Instructor
Joined: Sep 2010
Posts: 155
Likes: 0
From: Milton Georgia
100% WRONG.
I want an auto trans because I have left knee problems from football (long time ago, before they had the surgical techniques, etc. they have now), and although the clutches are much easier to depress than they used to be, I'm not real sure how many "depressions" of the clutch my knee will take.
BTW, in the 70s, every car I owned was a manual trans...
Instructor
Joined: Sep 2010
Posts: 155
Likes: 0
From: Milton Georgia
How does what someone else wants be a disappointment? If someone wants or doesn't want a particular transmission, who does it impact? What's next? The available colors?
Sorry to bring up politics, but this reminds of a quote attributed to Jeff Foxworthy:
"If a Republican doesn’t like guns, he doesn’t buy one.
If a Democrat doesn’t like guns, he wants all guns outlawed.
If a Republican doesn’t like a talk show host, he switches the channel.
Democrats demand that those they don’t like be shut down.”
Jeff Foxworthy