Corvette Chiefs, Pt. 5 or 5: Tadge Juechter

Corvette chief engineer Tadge Juechter delivered the C7 Corvette, the C7 Z06, the C7 Grand Sport, the C7 ZR1, and soon the 2020 mid-engine C8 Corvette.

Dateline 1.29.21, Images: Graphics by the Author, Image from GM Archives – All five Corvette chief engineers contributed mightily and in their own unique ways. But only Tadge Juechter has the distinction of having done hard engineering on five generations of Corvettes. When Juechter went to work in 1993 as chief engineer Dave Hill’s right-hand-man, there were two objectives; keep the then-current C4 fresh and interesting; and design and develop the most revolutionary Corvette to that date, the C5. After Hill’s retirement, Tom Wallace was Vehicle Line Engineer (VLE) and chief engineer for the Corvette. Wallace accessed that because of Juechter’s 15 years of experience, he was the right man for the chief engineer position. Wallace stayed on as VLE and eventually took an early retirement offer.

While Juechter didn’t have the racing background that Hill and Wallace had, he was raised in a Porsche household and liked to tinker around with mechanical things. As a young teenager growing up in Chappaqua, New York in the ‘70s, Juechter built a prehistoric mountain bike with a full front and rear suspension. His folks even gave him their wrecked Cadillac to take apart.

During Juechter’s college years at Stanford, he worked two summers on a GM assembly line, an experience not to his liking. Juechter graduated with degrees in aerospace and mechanical engineering and had no intention of working for GM. Then in 1978 a friend asked Juechter to tag along to a GM interview and ended up interviewing as well; and was offered a job. The late ‘70s and ’80 was a challenging time for the American car industry, but at least Juechter had a solid job. In the car business, if your ambition is upper management, an MBA is a must-have degree. Juechter earned his MBA from Stanford GSB in 1986.

By the time Juechter interviewed with Hill for the position of Assistant Chief Engineer, he was aware of the aging Corvette and impressed with the in-the-works C5. The C4’s plastic interior was a major bone of contention with Juechter. Hill was impressed and Juechter got the job. The jump from the early ‘80s designed C4 to the C5 was revolutionary. The creation of the Corvette Racing Team was the beginning of the deliberate merger of Chevrolet engineering and Corvette racecar engineering that was poured into the C5 Z06. Early on, Chevrolet general manager Jim Perkins wanted an inexpensive Corvette that would appeal to racers; this became the ’99 Hardtop and the Hardtop became the C5 Z06. While the C6 was an evolved version of the C5, no one was expecting the 505-horsepower 427 Z06 with an aluminum frame and dry-sump oil system.

From 2005 to 2008 sales averaged 36,816 cars per year. In 2006 Tom Wallace was Corvette VLE and chief engineer. While Wallace was a racer, his Corvette experience was a little thin. When Wallace learned that Juechter and his team were working on a mid-engine prototype, he knew that Juechter was the brains behind the Corvette. Juechter was promoted to chief engineer, North American Corvette.

Juechter has said that he was shocked when given orders to make the C6 ZR1; the goal was to build the best possible Corvette for $100,000. A big-block was briefly considered but rejected because of its weight. All-Wheel-Drive was not possible on the C6’s platform. The Z06 was to be the track car and the ZR1 would be GM’s halo, Grand Touring supercar.

Then the economy stalled out and the in-the-works C7 was put on hold indefinitely. Wallace took GM’s early retirement offer, leaving the Corvette all to Juechter. When GM slammed into bankruptcy in June 2009, for a time it looked like it was curtains for GM. But it turned out that the government auditor that was looking into the Corvette was a car enthusiast and knew about the pending C7. Upon examining the books, it was discovered that the Corvette was one the few GM car lines that was making money. Juechter’s team was told to get busy on the C7. The Corvette and the Bowling Green assembly plant were spared.

By the time you read this, the C8 will have made its debut and will be the most revolutionary Corvette ever. Previously, the C5 had that honor because of its all-new engine and drivetrain, and its hydroformed perimeter frame and backbone center section. The C6 and C7 generations are both evolutionary versions of the C5. The C5 and C6 are Hill’s Corvettes; the C7 and C8 are Juechter’s Corvettes. As of this writing, we know the basics of the C8, but none of the hard details. So lets look a Juechter’s C7.

A big part of Juechter’s job as VLE is to make sure there’s a Corvette for everyone with a variety of price points, and a base car that offers outstanding visual and performance value. Juechter said, “It helps having worked on the C5 and C6 because you know where a lot of the land mines are.” With horsepower ever increasing, it’s critical that the car be made easier to drive. The base C7 has 455-net horsepower; way more than any big-block ever had; yet the C7 is a car that is easy to live with. The 755-horsepower 2019 ZR1 is absolutely astonishing; it can perform on par with exotic sports cars, yet be a comfortable, usable GT machine. Electronic suspension, steering, braking, rev-matching, paddle-shift 8-speed automatic and fuel management are responsible for a balance of extreme power and civility. Imagine trying to drive a Greenwood widebody racer on the street.

When the C7 was unveiled, fans were stunned to learn that the base model had an aluminum frame and that later the Z06 and ZR1 would be available as a coupe or convertible and with an 8-speed manual or automatic transmission. Another first was achieved; the 8-speed automatic was quicker than the manual version.

Corvette interiors have often been a bone of contention with critics and the C6 took big hits for its interior. To get C7’s interior spot-on, Juechter made sure designers had set-of-the-pants experiences of life inside a 1-G cockpit; to know what it feels like having skin pressing on hard objects. He also made surer there were no distracting infotainment systems; just important information for spirited driving. The C7 has received rave reviews for its interior.

Concerning the C7 ZR1, initially there were no plans to make the car, as designers didn’t think they could do more beyond the Z06. But after a few years, plus aero input from the Corvette racing team, a new plan emerged to make the ZR1 the most powerful, stable, advanced front-engine Corvette ever offered. Many speculated that Chevrolet might build the front engine and mid-engine Corvettes side-by-side, but that will not be the case. C7 production will end in summer 2019 and the last C7 will be a black Z06 that will be auctioned off, with proceeds going to the Steven Siller Tunnel to Towers Foundation.

While Juechter was an integral part of the C5 and C6, those were Hill’s Corvettes. Even though Juechter guided the C7, the C5, C6, and C7 all have Hill’s Corvette DNA. The C8, on the other hand, is Juechter’s Corvette. People expect more of everything today, and everything is riding on the mid-engine C8. – Scott

This concludes my Corvette Chiefs Series. Below are links to parts 1-to-4. Enjoy

Corvette Chiefs, Pt. 1 – Zora Arkus-Duntov

Corvette Chiefs, Pt.2 – Dave McLellan

Corvette Chiefs, Pt. 3 – Dave Hill

Corvette Chiefs, Pt. 4 – Tom Wallace

The above articles originally were published in Vette magazine as part of my Illustrated Corvette Series monthly column.


 

The C7 Corvette Chassis, Pt 6: The Chassis Tadge Juechter Built

Tagdge Juechter’s Genesis Program C7 Chassis

 

Dateline: 1-20-20, Illustrations & graphics by K. Scott Teeters – The C6 Corvette was a much-improved C5 and was well-received upon release. Fans liked the crisp new look, the new interior (for a while), and the extra grunt. Since the successful arrival of the performance Z06 model in 2001, every new generation Corvette is expected to have a Z06. Within minutes of the C6’s debut, the next question was, “Where’s the Z06?” The following year when the C6 Z06 was unleashed, there was an unanticipated surprise; an aluminum chassis.

This wasn’t on anyone’s wish list and was a total surprise. It wasn’t even on Zora Arkus-Duntov’s Christmas list! Weighing in at just 3,132-pounds, you have to go back to 1964 to find a lighter Corvette (3,125-pounds). Powered by the mighty 427 LS7 engine with 505 net-horsepower, with C5-R suspension technology, the C6 Z06 was better suited for the track, although many learned how to drive the new beast successfully on the street. The C6 Z06’s aluminum chassis had no trouble handling 638-horsepower in the ZR1 configuration. Bravo Corvette chassis engineers!

When Tadge Juechter’s C7 Corvette debuted, fans were stunned to learn that the base model C7 was built an even better version of the Z06’s aluminum chassis. But wait, there’s more! The same new aluminum chassis would be used for the coupe AND convertible Corvette. This was a major breakthrough and bespeaks of advanced engineering. Here’s how Juechter’s team did it.


Juechter’s objective was to build a modern performance car that delivered enhanced driving experience, more efficiency that yielded more performance. Every element had to contribute to the overall performance and there would be nothing fake. That explains everything that we see on the C7 Corvette, but what’s unseen is even more amazing.

As we learned from the C5 with its hydroformed side rails, stiffness matters. Juechter is on record stating that while hydroforming was an engineering game-changer, the downside is that parts have a uniform thickness; even in areas where it isn’t needed. Hydroformed parts cannot be tailored for areas that need greater or less strength. Enter the Genesis Software Program.

This is almost computer magic. Engineers first determine the overall block space they want; length, width, and height. Then they determine where they want to place the major components; engine, transmission, suspension assemblies, cabin parts, etc. This creates negative spaces where the structure needs to be to hold everything together. The Genesis Program then synthesizes an optimum structure so that engineers can then take the load design and break it down into parts that can be fabricated and joined together. Afterward, dynamic stress and crash testing is performed and parts modified to meet predetermined objectives.

The C7’s hydroformed aluminum frame rails were optimized for the best the aluminum industry could offer, in terms of tensile strength, lightweight, and materials-joining technology. New aluminum metallurgy and aluminum fastening technologies allow engineers to augment the hydroformed frame with 7000-Series aluminum extrusions designed for specific areas; such as engine/front suspension assembly, transaxle/rear suspension assembly mounting points and frontal collision areas.

Careful consideration to the placement of major components was also critical. Juechter’s team felt that the C6 was slightly nose-heavy. Components were adjusted so that the C7 is now rear-biased, allowing more load on the rear wheels for better traction at launch; like a racecar. The front wheels were moved forward 1-inch making the wheelbase 106.7-inches. This is the longest wheelbase Corvette ever made. The shortest was the C4, measuring 96.2-inches. Moving the wheels forward also allowed for more space under the hood for the new LT1 engine and various auxiliary systems. This also preserved “crash space” in the front.

Offering an aluminum frame for the coupe and convertible was a big challenge for the team. But because the basic frame structure is so strong, it didn’t need additional roof structure via a fixed roof. The net result is that not only can the Z06 and ZR1 have lift-off rood panels, but both can also be offered as a convertible. This was unimaginable for the C5 Z06, C6 Z06, and the C6 ZR1. According to Ed Moss, the C7 structural engineer group manager, his engineering team tailored sixteen different thicknesses of various grades of aluminum from 11-mm to 2-mm. The completed C7 aluminum frame is 100-pounds lighter than the C6’s steel frame and is 60-percent stiffer. Juechter said that engineers consider the C7’s aluminum chassis to be the most beautiful part of the C7. Perhaps someday Chevrolet will offer a transparent carbon fiber body option.

The C7 frame was also designed for aerodynamic efficiency. In the past, engineers tended to only consider how air passed over and under a performance car. The C7 literally breathes. Spaces under the car’s skin and in between the chassis structure were designed for the internal ducting for engine cooling, brakes, transmission, and differential cooling, and venting. Other spaces allowed for electrical and plumbing fixtures for coolant, fuel, and air conditioning ducting.

The C7 design team worked closely with the Corvette Racing Team on airflow management because even racecars are concerned about fuel consumption, as well as top speed dynamics and stability. Two of the most obvious ducting and venting features is the air extractor on the hood, and the NACA ducts on the top of the rear fenders.

Image: GM Archives

Taking a lesson from the C6.R Corvette racecars, the C7’s radiator is tilted forward. One-third of the air that passes through the radiator is vented out of the hood. The hood louvers are angled so that the exiting air flows tightly over the car creating additional downforce to the nose of the car; thus eliminating the dreaded nose lift.

Heat exchangers (radiators) for the transmission were placed in the back, close to the transaxle with air ducted through the NACA duct feeding into the heat exchangers and then vented out through vents next to the taillights. This is just another example of how every element on the C7 has a defined purpose.

All of the foundational work that went into the C7’s chassis laid down a structure what was easily adaptable to the $2,780 Z51 suspension option that included; performance brakes with slotted rotors; dry-sump oil system; suspension upgrades; special wheels and tires; electronic limited-slip differential with a cooler, performance gearing, and an aero package. The Z51 was for drivers that wanted to use more of the C7 460-horsepower and explore the pleasures of the C7’s superior structure.

The 2015 Z06 with its supercharged 650-horsepower LT4 engine, wide-body, suspension, and tire enhancements work wonderfully with the C7’s basic structure. The same can be said for the 755-horsepower ZR1; the basic structure is up to the task. Arguably, the most interesting use of available C7 components is the Grand Sport. It has the aggressive-looking Z06 body and suspension parts that take using the base model’s 460-horsepower to a whole new level.

I will now go out on a limb. At the C7 ZR1 debut in 2018, Juechter said that his engineers had taken the C7 as far as they could with the ZR1. Are they working on a C9 Corvette to sell alongside the mid-engine C8? If so, will it be built on a carbon fiber chassis? When it comes to Corvettes, things always evolve upward. – Scott

Corvette Chassis History, Pt 1 – C1 Chassis – HERE

Corvette Chassis History, Pt 2 – C2/C3 Chassis – HERE

Corvette Chassis History, Pt 3 – C4 Chassis – HERE

Corvette Chassis History, Pt 4 – C5 Chassis – HERE

Corvette Chassis History, Pt 5 – C6 Chassis – HERE

 


 


The Tadge Juechter & Harlan Charles Show! ’18 Recap & 2’19 Preview – VIDEO

Harlan Charles & Tadge Juechter Hold Court at NCM’s Latest Michelin Bash Event: 2018 Recap & 2019 Preview

Dateline: 5.2.19 – The National Corvette Museum hosted their three-day annual Michelin NCM Bash from April 26 to April 28. Corvette product manager Harlan Charles and Corvette chief engineer Tadge Juechter delivered a 1-hour and 47-minute presentation recap of the 2018 season and a preview of what’s in store for 2019.

The event also included racing seminars, an update on the 1962 sinkhole Corvette, and using the C7’s navigation system. Chevrolet wants Corvette fans well informed and C7 owners completely up to speed with their car’s capabilities.

Special guests included former Bowling Green plant manager Wil Cooksey and early generation Corvette restoration expert, Kevin Mackay.

FYI, you can read my 2013 interview with Wil Cooksey in the November 2017 and January 2018 issue of Vette Vues; and my Kevin Mackay 2013 interview in the May 2018 and June 2018 issue of Vette Vues. Continue reading


The Tadge Juechter & Harlan Charles Show! ’18 Recap & 2’19 Preview – VIDEO”


2019 ZR1 Corvette Makes a BIG SPLASH at Dubai Debut!!! – VIDEO

Chevrolet Marketing truly out-did themselves with the Dubai debut of the 2019 ZR1 Corvette!!!

Dateline: 12-26-17 Images: GM Archives & Wiki Commons – Dubai is arguably the most spectacular place on the planet. Just look at the below images of the Dubai skyline at night. It shows what can be done with almost unlimited capital. The city looks like something out of a Star Trek film!

So what a better place to debut the new C7 ZR1 Corvette. Tadge Juechter said a subtle, but VERY interesting thing, did you catch it? He said that his Corvette engineering team did everything they could possible do to the C7 platform when designing and developing the ZR1. Hmmm.

When a chief engineer says that, do you know what that means??? Continue reading


2019 ZR1 Corvette Makes a BIG SPLASH at Dubai Debut!!! – VIDEO”


FINALLY! A Factory-Built ZR1 Convertible!!!

The rumors were true! The new C7 ZR1 will be available as a coupe AND a convertible. TOP DOWN, OH, WOW!!!

Dateline: 12.24.17 – Images: GM Archives – Let’s briefly back up to 1990 in order to put the significance of the new C7 ZR1 convertible into perspective. When the first ZR-1 was released in 1990 there was no way that it could have been offered as a convertible. In order to even make the C4 a convertible, a large X-brace had to be added to the bottom of the C4’s chassis.

The C4 ZR1 had a nice run from 1990 to 1995. But when the C5 Z06 arrived, offering ZR-1-level performance at a fraction of the cost, the C4 ZR1’s star began to fade. What made the C5 Z06 such a track star was it’s strong structure. It was as it Corvette engineers discovered structural rigidity. Thanks to lessons learned in the C5-R Corvette Racing Team experience, the C6 Z06 took the concept of structural rigidity to a new level, and with an aluminum frame to boot!

Corvette performance fans were so jazzed over the C6 Z06 that no one was pinning for something more. So, when Chevrolet released the C6 ZR1, dripping with carbon fiber and the supercharged 638-horsepower LS9 engine, heads were spinning and Duntov sat up in his grave and said, “Vhat?!?!?” (There was no convertible version, but no one was asking for one.) The C6 ZR1 was everything that Corvette engineers could possibly do with the C6 platform.

When that happens, there’s only one thing left to do – start working on the next generation Corvette! Continue reading


FINALLY! A Factory-Built ZR1 Convertible!!!”


THE KING IS BACK!!! The New 2019 ZR1 Corvette: The Facts

Chevrolet just released “The Ultimate Front-Engine Corvette”!

Dateline: 11.15.17 (All images GM Archives, except where noted) The wait is FINALLY over! If you recall, the C7 ZR1 was supposed to make its debut last January at the Detroit Auto Show, but was a no-show. Since then, there was a steady stream of reports, rumors, and spy photos of heavily camouflaged ZR1 engineering mule cars. Lots of tease, no solid details.

The December 2017 issue Car and Driver is first off the line to splash the new ZR1 and I’m sure the rest of the automotive print publications will be dedicating their covers to what is now being called, “The Ultimate Front Engine Corvette!” (Note the reference to “front-engine” as a primmer for the mid-engine C8.) But yes, the new King will get boat loads of ink.

If you recall, Car and Driver splashed the C7 ZR1 on its April 2017 issue with the cover story, “25 Cars Worth Waiting For”. After that, it certainly seemed like, “any day now” the ZR1 would arrive. Then the LONG wait began. I recently said to my Corvette friend, Mike Wahl, Continue reading


THE KING IS BACK!!! The New 2019 ZR1 Corvette: The Facts”


C7 Grand Sport Corvette, Best Street Vette Ever?

The BIG Return of the Grand Sport

2017-Grand-Sport-Corvette-1
Full-color 11×17 prints are available in our Amazon Store, HERE. Each print is signed by the artist, K. Scott Teeters, and numbered in a series of 500.

Dateline: 1.17.17 – The long-view story of the Grand Sport now has four chapters. The first chapter told the story of Zora Arkus-Duntov’s vision of offering to the public, lightweight, powerful, all-out racing cars that “could” be driven on the street – not unlike what Ferrari was offering – available through Chevrolet dealerships. It was a great idea, but went over like a belch in church with GM’s brass. The plug was pulled immediately and the five pilot Grand Sports were left to go fallow with no factory development or backing.

Part Two of the story happens 33 years later, in 1996. By this time, unless you seriously followed the early days of Corvette racing, you probably never heard of a “Grand Sport.” Continue reading


C7 Grand Sport Corvette, Best Street Vette Ever?”

CorvetteReport.com’s Top 10 Corvette Stories for 2011

Dateline: 12.30.11

A look back at a VERY BUSY year for the Corvette Community

The other day I was telling my wife, Karen, that the Corvette topic is virtually endless. With nearly 60 years of production, 21 special editions, race cars, tuner cars, experimentals, prototypes, events, auctions, car shows, history, plus the personalities associated with Corvettes, IT’S HUGE! An army of bloggers couldn’t cover it all, but I’ll do my best! As we ease into the last two days and the last weekend of 2011, I thought it would be fun to look back at what I think were the Top 10 Corvette Stories of 2011. So, in no particular order or importance, let’s take a cruise through the 2011 world of Corvettes.

1. Chevrolet’s 100th Birthday – The early days of the automobile industry were indeed wild. Companies were formed, bought out, merged, or went out of business – often very quickly! The truly wild part of the Chevrolet story has to do with the company’s namesake, Louis Chevrolet. It seemed that Louis and his partner Billy Durant didn’t see eye-to-eye and after a few short years, Louis cashed out and went on his merry way building race cars. But in what has to be the ultimate irony of the automotive world, after numerous businesses failed and the Great Depression caught up with Louis, the man “needed a job!” And where did he find employment? At Chevrolet, as an assembly line mechanic! For more of the story, CLICK HERE.


2. The 100 millionth Small-Block Chevy Engine – Last August GM announced that Chevrolet would be building its 100 millionth small-block Chevy engine later in the year and it would be installed into a ‘12 Corvette. Pretty damn cool, considering that the car’s survival was very iffy well into the ‘60s. Regardless, it’s great to see how Chevrolet has honored the small-block Chevy engine AND the Corvette by officially making what is currently the most powerful production engine ever built in Detroit, the ZR1’s 638-horsepower LS9 engine, the “100,000,000th Small-Block Chevy Engine.” BRAVO Chevrolet. Last November CorvetteBlogger.com did a very nice post covering this once-in-a-lifetime Corvette/Chevrolet event. To read the story, CLICK HERE.

 


3. Jalopnik’s MAJOR C7 Sneak Peek – Thanks to the internet and the blogosphere, there has NEVER before been this much anticipation for a new generation Corvette. When new scraps of C7 red meat hit the floor, us Corvette doggies go wild! Last November Jalopnik.com dropped a major slice on the Corvette community. At first they claimed they had photos. Then the next day they released three, very well done, computer-generated illustrations they claim are based on an unnamed insider that swears on a stack of Bibles piled up on his mother’s grave that this IS the new C7 Corvette! And not “just” the 2014 C7 Corvette, but the 2015 ZR1 Corvette. Of course, Chevrolet says Jalopnik got it all wrong, to which Jalopnik followed up with a post saying, “GM issues weak-ass denial of our 2014 Corvette exclusive.” Come on kids, PLAY NICE! You can catch out post HERE.


4. Another Le Mans Win For The Corvette Racing Team – It’s no secret that the Corvette Racing team didn’t have a spectacular year. Which goes to show us all that there’s no resting on your laurels. Just because the team won 100% of their races in 2004, 90% of their races in 2002 and 2005, and Le Mans six times before, doesn’t mean that a hundred things can’t go wrong out on a race track. Of the 10 races in the season, the team won two and came in 2nd place two times. Le Mans and Mosport were the team’s two first place victories and Long Beach and Mid-Ohio were the team’s second place wins. While a 20% win rate isn’t “spectacular” Le Mans IS the big prize. CorvetteBlogger.com did a very nice post on the Le Mans victory that you can read HERE. And you can keep up with the latest from the Corvette Racing Team at their official www.CorvetteRacing.com site. Continue reading “CorvetteReport.com’s Top 10 Corvette Stories for 2011”