Skip to main content

2020 Mid-engine Corvette C8 - What You Need to Know


Rumours of a mid-engine Corvette have been around basically since the C2 Corvette, the first Stingray. I've heard some people argue that the Corvette is already mid engine because the engine sits almost entirely behind the front axle, making it mounted midship. But everyone knows that the classic definition of a midengined car is that of an engine mounted between the seats and the rear axle, not the front axle. That's what everyone pictures if you say "mid-engine". Worse still (for the Corvette), a true midengined layout has a lot more traction - all else being equal - than a front-midship mounted engine like the current Corvette, no matter how far back it is mounted. Chevy knows this, and there has been no shortage of Corvette mid-engine concepts for decades. This time, however, it's different.

For one, manufacturers these days tend to keep very special/high performance models under wraps for a very long time during development, only revealing them when they are darn near to production spec. Examples include the 911 GT2 RS, the Cayman GT4, the Ford GT, various Mustang Shelby's, etc. Whenever there is a wild concept revealed, it usually is a showcase of technology rather than a showcase of a production model that is just around the corner. Now, there has been several mid-engine Chevy concepts throughout the Corvette's life up until the C4 (CERV III concept shown below), but they have been quiet since then. If history is any indication, a recent mid-engine Chevy concept would have basically all but confirmed that a mid-engine Corvette is actually NOT coming any time soon. Having had no recent mid-engine concepts revealed is a good sign.


For another, and much more importantly, there has been many spy shots and a few spy videos of mid-engine prototypes tested on the street and on track - the Nürburgring, of course (enjoy video below of a prototype running on the street and at the 'Ring). There are also technical details and technologies that point to a redesigned 'Vette. So if Chevy is working that hard on a mid-engine prototype (i.e. on public roads and tracks outside of GM's proving grounds) and it is not showing it to the world, the only conclusion is that this time, it is meant for production. As a result, that the automotive society - journalists and fans - are collectively convinced that this time, it's for real. The next Corvette will be mid-engine, or at least a variant will be. With plenty of articles floating around, publications/patents, spy shots and videos, and even some (supposedly) leaked documents, I figured I'd make a post summarizing what is known about it and provide a bit of technical background where I could.



Chassis & Suspension:

You can't tell much about the suspension from spy shots but, luckily, leaked CAD images that were posted not too long ago - assuming they are accurate and reflect the design of this car - show some important bits.


The rear subframe is large and not meant for only holding the suspension like on a traditional unibody chassis. It clearly has engine and transaxle mounts, suggesting that the car might be built around a centre tub or chassis with front and rear subframes bolted to it. It isn't immediately clear from just the CAD images what it will have for rear springs but the structural members and drivetrain near the rear lower control arm/wishbone suggest little room for a transverse leaf spring so this could finally use coil springs all around.

Front and rear suspension designs appear to still be unequal length double wishbone. I was expecting to see pushrod suspension or something to move components inboard but it doesn't look that way. There is a traditional coil-over spring setup up front, albeit steeply raked inwards as you'd expect but certainly nothing like the Ford GT's unique inboard double-spring system with pushrod torsion bars.



Brakes:

Brakes are visible in the spy shots. There aren't much details on the front brakes from the leaked CAD images, just a fixed calipers and a large disc/rotor. GM has been offering carbon ceramic brakes on its highest performing Corvettes since the C6 ZR1, so it's probably a safe bet to be offered here, at least as an option. There are no brakes shown on the rear axle in the leaked CAD. However, a spy shot not too long ago revealed not one, but two brake calipers on the rear axle. It's not clear why.

It could be to increase stopping power by increasing the clamping force without increasing heat along with chances of fade at a single rear caliper. Race cars in the past such as the Porsche 956 have used dual brake calipers in the back. With the engine in the middle, rear wheels should have more available grip, while simultaneously taking away some from the front. That, in turn, would increase the rears braking capacity and therefore increase heat generated there. Unlike front brakes, however, which have the entire front fascia to utilize for some air inlets/intakes to duct air for brake cooling, the rear is more restricted, especially as you move the engine to the back because the engine will be fighting over every inch of surface area to gain as much air as possible for combustion as well as cooling.


Another possibility is much simpler; it's a parking brake. Cars that have used a second brake caliper as a parking brake are Ferrari F430, Lamborghini Murcielago, Aston Martin Vantage, and probably others. Judging by the size, I'd say it's just a parking brake.

Engine & Transmission:


The engine is clearly longitudinally mounted. If it is a complete engine, it doesn't look like there are any turbos or supercharges. We also know from the recently revealed Cadillac twin-turbo 5.5 litre DOHC V8 that the engine uses a "hot-vee" turbo arrangement with the turbos mounted in the space between the cylinder banks and GM certainly won't change that arrangement for the Vette (assuming it will likely end up here). With this engine height being as tall as it is and the exhaust piped directly towards the back, it doesn't look like there is room for vee-mounted turbos. The height also makes it very unlikely that there is a top mount supercharger as is usual for Chevy engines, suggesting that this is likely a naturally aspirated engine with no "external" turbos/superchargers. Chances are, it will be the next gen 6.2 litre OHV V8 which is anticipated to be the base engine to the optional twin-turbo Cadillac LT7 V8 recently revealed. Horsepower figures aren't known for the base engine. The Cadillac engine was just confirmed to be making 550 hp and 627 lb-ft of torque. I suspect it will make more here to the tune of something north of 600 hp (IMO) and the base naturally aspirated 6.2 litre will certainly make more than the current one in the base C7 Stingray. I suspect anywhere between 480 hp and 500 hp.


Most publications are saying that there will not be a manual. There is already a very strong dual clutch transmission candidate by Tremec, which makes the manual transmission in the current Vette (the current auto is a GM unit). Seemingly an unlikely DCT manufacturer and much better known for its manuals in Mustangs, Camaros, Challengers, Corvettes, and Vipers, Tremec actually owns Hoerbiger Drivetrain Mechatronics. In an attempt to expand and reach broader markets, Tremec acquired Hoerbiger to help develop DCT's instead of, presumably, starting from scratch. The result? Tremec’s TR-7007 and TR-9007 family of 7-speed dual clutch transmissions. TR-7007 has a torque capacity of 516 lb-ft so we (hopefully) don't have to worry about that one.. The TR-9007, though, has a torque capacity of 664 lb-ft. That's a lot more like it.

Although it is not confirmed to be used in a mid-engine 'Vette, it can be used in RWD and AWD layouts, including trans-axle configurations according to Tremec's own product literature and it was developed for "products characterized by high-torque applications in sports cars, SUVs and diesel vehicles that demand performance and refinement." But wait, there's more! It is good for 10,000 rpm. It's probably a safe bet that it will make its way in the new midengined Corvette. It weighs 198 lb. according to Tremec, whereas the current 8-speed GM 8L90 weighs between 211-218 lb., so the DCT should actually be a little lighter.


As for manuals, I personally wouldn't be surprised to see a manual on the base engine. I haven't found any publication confirming or expecting that so I could be out to lunch, but Chevrolet already has a manual rear transaxle to work with the current 6.2 litre LT1 V8 in the C7 Corvette. Gear ratios, rpms, and torque capacity of that transaxle are already compatible. I don't see an upgraded version of the LT1 being so far improved/changed that the current transaxle doesn't work anymore. The only potential issue is that the current rear transaxle is obviously separated from the engine in the front by a torque tube so the only limitation could be incompatibility to bolt directly to the engine, but for an OEM manufacturer, that should be fairly simple to get around (if there is a problem to begin with).


Aero:

Chevy hasn't shied away from big aero recently. Splitters, canards, dive planes, big spoilers, vents, the lot, even on the Camaro (see 911 GT2 RS vs Camaro SS 1LE). It should be no surprise to see big aero elements and devices used, especially in top versions. One major new tech, however, is active aero. GM recently filed a number of patents covering active aero elements. Three patent filings cover Active Spoilers, Active Side Skirts, and Downforce Generating Ducts. An additional patent filing brings it all together along with active suspension. A lot of the devices described in the patent filings are shown on a C7 Corvette. Since the C7 Corvette is nearing the end of its life - likely within a couple of years - and there is a brand new extremely high performing Corvette just released - the ZR1, taking the highest Z ranking no less - this is almost a guarantee that they are meant for the next generation Corvette, be it front or mid engine.


Active spoilers are commonplace now on high end sports cars and super cars. This takes it a step further, though. Whereas most active spoilers vary height and tilt (angle of attack), this one can also move front and back. The first two are obvious. The higher the spoiler, the further it is from air flowing over and around the car (which is more turbulent, less effective) and the better it is at generating downforce. The tilt angle of an airfoil spoiler is directly related to its ability to generate downforce, just like an airplane wing angle of attack - except it's inverted so it generates downforce instead of lift, plus adjusting tilt angle could also be used to an extreme angle as an airbrake. The last one - the ability to move front and back - could have two benefits. Just like spoiler height that allows it to move further away from turbulent air, moving the spoiler towards the front of the car brings it closer to the cabin, where air is even more turbulent. This could result in a wider range of adjustability. Moving it to the front could also have some effect on front-to-rear aero balance.


The other active aero elements are active side skirts. The patent filing covers active side skirts, allowing the effectiveness of those skirts to be varied by raising or lowering them closer to the ground, as well as extending them outwards or retracting them. Moreover, the filing includes individual control mechanisms for side skirts on each side of the car allowing the car to vary downforce side-to-side, so the car could optimize downforce for left and right hand corners. Side skirts serve to keep air flowing where you want; air flowing outside and around the car stays there. This has two benefits. First is reducing drag by preventing air flowing around the car from getting disrupted by going underneath the car. The second is, by doing so, you can also increase (effective) downforce.

In aero-optimized performance cars and especially race cars, there are passages under the car designed to speed up the air as it passes underneath the car. Air pressure is inversely proportional to speed, meaning that as air speed increases, pressure decreases. Low pressure underneath car has the same effect as downforce, except that it doesn't push the car down so much as it does "pull" it down by creating a relative vacuum. The challenge is that a relative vacuum wants to also suck air in from around the car, not just the car itself. By minimizing the amount of air that gets sucked in from the sides, side skirts allow undercar passages to maintain their relative vacuum/low pressure and increase effective downforce, which takes us nicely to the last active aero tech filing; Downforce Generating Ducts.


This is already explained to an extent above, but aero optimized cars often use underbody ducts or passages to control airflow. Those are used for two benefits. First of which (already discussed) is to speed up airflow. Faster moving air has lower pressure (Bernoulli's principle), effectively increasing downforce. Another function for underbody passages is directing air towards a rear diffuser. Rear diffusers increase downforce by expanding the volume of the exit passage for air moving underneath the car. In other words, air moving underneath the car has to "exit" from the back. The volume of passage underneath the car is smaller than that of where it exits; the diffuser. By expanding the volume, you require more air to fill the newfound volume, resulting in more flow and faster moving air at the inlet (throat) of the diffuser underneath the car, which creates downforce. Another benefit of rear diffusers is slowing down the air at the trailing edge where air from underneath the car (fast) needs to meet air from above car (relatively slow). This reduces turbulence at the back of the car and therefore drag. GM's patent includes ducts from the top and bottom of the car (C7 Corvette pictured), although no mention of them being active but there is potential to make them active by varying the volume of the "throat" of the duct or varying airflow to the diffuser, reducing its effectiveness.



Finally, a previous patent preceding all those filed by GM last year describes "a method or apparatus" to tie everything together. The intent is to use input about what the car is doing such as yaw, steering angle, tire pressure, speed, lat-g, and others to control all active systems simultaneously and optimize performance. The current Corvette already does this and can vary damping rates (if equipped with magnetic shocks), differential lock (e-LSD), and brake activation through Performance Traction Management (PTM). Adding active aero will only enhance and vastly expand the ability of the car to optimize grip for any particular scenario where it's needed.

Pricing & Release Date:

Who knows? Pricing is perhaps the biggest unknown (by far IMO). I don't see this car costing more than $200,000 and I don't see it under $100,000. I think a base price around $120,000 is not too unreasonable, with options taking it towards $180,000. This is pure speculation, though. I would be very surprised if it cost anywhere near the Ford GT but I wasn't expecting the GT to cost that much either, so take that for what it's worth.

As for reveal, I read an article from end of last year (2017) where the writer was expecting the car to be revealed at the Detroit Auto Show in January of this year (2018). Here we are 10 months later and it is still not revealed. Judging by the stage of development you can assume from the spy shots and videos, we are likely not too far away. The Detroit Auto Show is one of the biggest for Ford and GM. Ford decided to reveal its GT in the same show three years ago in 2015 along with the Shelby GT350R and the current F-150 Raptor. GM revealed the current CTS V that year and a year prior (2014) revealed the C7 Corvette Z06 and the C7.R Corvette race car. I would be surprised if we have another 1+ years until the reveal (i.e. 2020) so perhaps this January is a safe bet. If that's the case, we should be no more than 1 year from on-sale date so I would expect deliveries to begin in 2020, if not very late 2019 as a 2020 model year. If revealed this January, there's a decent chance publications will begin testing or at least first drive reviews next summer. Giddy up!


Follow Ram's Eye The Track Guy on Facebook and Instagram!




Comments

Popular posts from this blog

Michelin Pilot Super Sports vs Firestone Firehawk Indy 500 - Street Review

I've been a huge fan of Michelin PSS tires and exclusively bought them for the Mustang over the last four years. So how did I end up here? This year, I was hugely interested in trying an "R-comp" tire. I had my eyes set on Bridgestone Potenza RE-71R's for two simple reasons: price and reputation. They seem like they're easily the most affordable (from a big brand) R-comp tire and combine that with a reputation for having tons of grip, it was an easy top contender. I had my concerns, though. For one, I'm told and have read that they are an autox tire, not really designed for high speed, pressure, and temps associated with open track. For another, the Mustang is a heavy car (as far as track cars are concerned) being roughly 3,800 lb. (including driver), which will amplify the unwanted open track loads. Combine that with the fact that I drive a good amount on the street during the summer, and I was very worried that they wouldn't last more than a handful of…

The New Shelby GT500 Is Coming in Two Weeks

If you've been paying attention in 2018, you probably already know that a brand new S550 Mustang Shelby GT500 is coming this year. And there is good reason to believe that the 2019 North American Auto Show (often referred to as the Detroit Auto Show) in less than two weeks will host the debut of the GT500. Why the 2019 Detroit Auto Show? It's one of the biggest auto shows for Ford. Ford decided to reveal its Ford GT at the same show three years ago in 2015, and also threw in the current Shelby GT350R and the current F-150 Raptor for good measure.

The Shelby GT500 has already been confirmed by Ford and teased in a couple of pictures and videos. Why is the GT500 significant? The first Shelby GT500 was a 1967 model and it was developed with help from the legend himself, Carroll Shelby. Because of Shelby's personal involvement in racing at the time, the original Shelby GT500 was actually meant to be a track monster, not only a straight line car. It used a a modified version o…

Michelin PSS vs Firestone Indy 500 - Track Review

A couple of weeks ago, I posted my first impressions of Michelin's PSS vs Firestone Firehawk Indy 500 tires. I've run PSS's for several years on the Boss, but I'm trying the Indy 500's for the first time. In short, I was worried about the narrower tires (I was running 285/35/18 PSS but could only find the Indy 500 in 275/35/18) and tread squirm, but I was happy with them up to that point just driving on the street. I had the chance to drive on them for three track days now. So what were they like? After my first session, they made an impression that basically persisted for the rest of track sessions on them. Phenomenal, unmatched value. Now, if value is something that stands out above all else, it typically means the compromise between qualities you want and those you don't is less than ideal, but the value is attractive. This is no different. I'll start with the bad, which really boil down to two: ultimate grip and grip longevity.

Grip is noticeably lowe…

The S209 is a big turbo wide-body WRX STI

A Subaru WRX STI is a very familiar car by now. Partially because it's very successful and capable, but partially because its engine and hp has been more or less unchanged for about 15 years in North America. It came out in 2004 with a 4 cylinder 2.5 litre turbocharged boxer engine making 300 hp. Today, the standard issue WRX STI is still powered by a version of that same engine making all of 305 hp, a measly 5 hp increase in two redesigns over 15 years. People have been complaining and, it turns out, Subaru has been listening.


Enter the S209. It is based on the Japanese market only S208 developed with Subaru Tecnica International (STI). It still uses the same North American EJ25 2.5 litre engine, but it's all grown up now with forged rods and pistons, and a bigger turbo (bigger turbos make everything better). In this case, it seems like the housing is the same, but HKS increases the compressor wheel by 5 mm to 65 mm and turbine by 3 mm to 56 mm. That has allowed Subaru to tu…

Can Telemetry Explain Schumacher's Talent?

With Michael Schumacher's recent fantastic news that he is no longer bedridden, I figured it would be a great opportunity to share one of my absolute favourite videos about him. I stumbled across this video last year and immediately bookmarked it. It includes bits from interviews with various F1 drivers, including Schumacher himself and team mate Johnny Herbert. But my favourite part of the video is when they compare telemetry between Schumacher and Herbert.

The telemetry clearly explains where Schumacher is saving (lap) time and how exactly his talent and skills translate to better (and ultimately faster) driving. His talent is even more impressive when you consider the lack of active throttle mapping in modern F1 cars and the myriad of improvements made to driveability. Watch below to see for yourself.


What I love about this video is that I found Jonathan's Palmer analysis of Schumacher's telemetry to be absolutely true when applied to my driving on track.

SPOILER ALERT…

Rejoice: The 2020 Shelby GT500 Could Get A manual!

I posted about the new Shelby GT500 on here, DriveTribe, my Facebook, and my Instagram (you can read about all the tech and capabilities that Ford stuffed into the GT500 in my GT500 reveal post here). Perhaps the biggest surprise (and only disappointment) was that the car wouldn't be offered with a manual. Instead, it would come with a 7-speed dual-clutch auto made by Tremec.

If there is one common theme across all platforms where I posted, though, it's that people want a manual and it looks like Ford is going to be listening very closely. Prior to the reveal, I
predicted that this was going to be the first GT500 to offer an automatic, but I figured it would be the 10-speed automatic available on the Mustang GT and I never expected Ford to drop the manual as an option.

According to a report by Road & Track, the reason why Ford went for this transmission instead of the torque-converter automatic was because it offered quicker shifts on track, suggesting that the 10-speed a…

Contact Me

Name

Email *

Message *