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GM Engineer Larry Nitz says the Z06 with the automatic with get high power and high MPG. Here's today article, thanks to it's "find" by SRF's "Steveinaz."


AutoNews said:
GM: Vette Z06 to get high power, high mpg!

Nitz: Corvette Z06's eight-speed paddle-shift automatic will shift faster and smoother than the dual-clutch automatic in the Porsche 911 Turbo S.

The supercharged 2015 Chevrolet Corvette Z06 that goes on sale early next year will produce 650 hp, the highest ever for a General Motors production car.

But the engine is only half the powertrain story. Larry Nitz, GM's chief engineer for transmissions, says the Z06's new eight-speed paddle-shift automatic transmission will shift faster and smoother than the dual-clutch automatic in the Porsche 911 Turbo S.

Nitz, speaking to reporters recently, said the superfast shifts were accomplished with fast electronic solenoids and other controls.

The new gearbox replaces a six-speed automatic and weighs about eight pounds less because of extensive use of aluminum and magnesium.

Chevrolet officials have said they expect the Z06 to be one of the most fuel efficient cars of its type. The outgoing 2013 Z06 was rated at 24 mpg highway.

The new powertrain will be exclusive to the Corvette, which starts at $53,995, including shipping. Chevrolet has not announced prices for the 2015 Z06 yet, but the final 2013 Z06 had a starting price of $76,595, including shipping, according to Edmunds.

GM engineers targeted the Porsche 911 Turbo S as they were developing the Z06's LT4 engine and the eight-speed transmission. Chevy says the Z06 has 90 more hp and 134 more pounds-feet of torque than the 911.

The Corvette also should maintain its weight advantage over the Porsche. The 2013 Z06 weighed 3,175 pounds while the 911 Turbo S weighs 3,538. The weight of the 2015 Z06 has not been released, but the car uses a new, lightweight aluminum frame.

Nitz would not say if the Z06's 8L90 transmission will replace the eight-speed automatic from supplier Aisin AW Co. that GM uses in certain performance versions of the Cadillac CTS. But if GM follows its usual practice, the 8L90 will debut in the Corvette and migrate to other performance vehicles, such as the Chevrolet Camaro Z/28 and Cadillac's V-series vehicles.
 

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Obviously there is no independent verification but Tadge has said on a couple of occasions that the A8 will be track certified, something the A6 has never been, that I am aware of.
 

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Interesting, when I was at the Reveal and for the week after when interviewed, top Corvette team members talked about the eight-speed auto being track certified. However, when at the April Bash, when specifically asked about this, Tadge cautiously said, that the 8-speed would be good for a typical 45 minute to an hour track session.
 

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Wow impressive it is that much lighter than the 911 turbo along with all that power. Really cant wait to see this beast on the streets... and see some 0-60 and quarter mile times.
 

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We might well get exactly those very numbers August 28th-30th, from the NCM "20th Anniversary Celebration" as we could weight, fuel economy, and more. We all hope so!
 

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Interesting, when I was at the Reveal and for the week after when interviewed, top Corvette team members talked about the eight-speed auto being track certified. However, when at the April Bash, when specifically asked about this, Tadge cautiously said, that the 8-speed would be good for a typical 45 minute to an hour track session.
Just a few points...
A typical DE track session is 20-30 minutes depending on the group. Should the A8 prove to be capable of withstanding the temps of a 45-60 minute session, in nearly any ambient temp, it would be a huge achievement. Also, it would be nice to know if they intend to "track certify" it for advanced-level and up drivers.
To be honest, I am skeptical but hope I am wrong.
S.
 

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Snorman, can you help me understand please, how/in what ways does a manufacturer track certify a car?
I believe it's basically verifying all the systems, cooling, brakes, engine, trans, diff, tires, etc. can perform within their design criteria for the time intervals quoted above, 40 - 60 minutes. The comment about how long the A8 can operate under track conditions would be one of those "certifications".
 
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Snorman, can you help me understand please, how/in what ways does a manufacturer track certify a car?
Holy crap...I wish I had a solid answer for that question, which I think is where the ambiguity lies.
I would think that to "track certify" means with a pro-level driver at a reasonably challenging track over a period of not less than 30-minutes. This should be repeatable.
Put it this way...when an OEM does durability testing it is under conditions which 99% will never replicate, using numerous samples and including redundancy on several levels. IMO, if GM is going to use the term "track certified", as an advanced level driver I should have no reasonable issues related to braking performance, drivetrain cooling and general performance over a duration specified by the OEM.
I understand that brake fluid swaps and other minor and OEM-specified upgrades may be necessary, but my car should not go into limp-mode 10-minutes into a session at Sebring/Homestead/RA/etc. because the trans is overheating.
S.
 
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John, have you heard anything about how well the new 8-speed transmission might hold up for track-day use?
I spoke with an engineer about the 8 speed in track use what they had to do was add some sort of additional cooling lines down along the door to the rear. They needed these because of track use so there shouldn't be any issues.
 
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