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Corvette Acceleration Testing [Video]

Old 06-21-2018, 09:59 AM
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NewYuriCity
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Default Corvette Acceleration Testing [Video]

GM Authority got a hold of a video of the C8 mule doing some acceleration testing, take a look:

http://gmauthority.com/blog/2018/06/...e-track-video/


A new video obtained by GM Authority shows the forthcoming mid-engine Corvette under acceleration testing at the track. The clip shows three launches of the future Corvette, which is still wearing plenty of camouflage, in different weather conditions, giving us our best look yet at how the upcoming sports car sounds at wide-open throttle while potentially revealing and/or confirming some juicy details.

First Launch

During the first launch, the mid-engine Corvette comes to a complete stop, shows off more of its LED taillight design in the process, turns off the right lane change indicator (blinker), and launches. There is no audible or noticeable wheel slip as the prototype rockets forward.

From the sound of it, we’d say there is a healthy V8 engine under the hood, though it’s unclear whether the engine is of the Overhead Valve “push-rod” variety or a Dual OverHead Cam (DOHC) design (our bet is on the latter). Whatever the engine, the speed of the upshifts make it rather clear that a dual-clutch transmission (DCT) is doing the shifting, as the developmental prototype runs through the first four gears during this run.

Second Launch

The second launch, which starts at 0:18 in the video, is more dramatic than the first. Due to the wet road conditions, the mid-engine Corvette sees some audible wheel slip in first gear before shifting into second gear. A detailed analysis of the video seems to indicate that the rear wheels were the ones that slipped, potentially indicating that the model seen in the clip is rear-wheel-drive. By contrast, various rumors about the mid-engine Corvette have indicated that the upcoming sports car will be all-wheel-drive.

As such, we can see one or a combination of the following scenarios playing out:
  1. The prototype seen here is a base rear-drive model and the mid-engine Corvette will have rear-wheel-drive standard, while offering all-wheel-drive as an option, potentially on higher-performing model variants
  2. The mid-engine Corvette will feature an advanced drivetrain that enables the driver to select between RWD and AWD, much like the new BMW M5 or Mercedes-Benz E63 AMG
  3. The mid-engine Corvette will not offer all-wheel-drive whatsoever, and stick to a rear-drive setup
Like in the first acceleration, this second run also shows the prototype model rowing through the first four forward gears before slowing.

Third Launch

Taking place at 0:32 into the video, the third launch mimics the turn signal indicator actions of the first run: the driver comes to a complete stop, disables the right hand turn signal indicator, and launches the Vette tester.

In contrast to the first launch, the pilot enables the left hand turn signal indicator shortly after beginning the acceleration, and changes one lane to the left, continuing the remainder of the acceleration in the middle of the three lanes. Sadly, the testing model then goes out of range of our spy shooter, cutting the video.

The GM Authority Take

It would seem that the focus of these runs was not only to test out the huge acceleration of the mid-engine Corvette, but also to trial the car’s stability, traction and launch control systems – as indicated by the various degrees of wheel slip as a result of 1) different road (wet/dry) conditions and 2) potentially different stability and traction control settings.
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Old 06-21-2018, 10:11 AM
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Thank you very much.

You just cut my daily production to a third with this video....
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Old 06-21-2018, 10:18 AM
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I guess the V6 theory is completely out the window...
Thats small block grunt I here...
short, with mountains of torque.

Very Very Americana.
Kudos to GM for making it their way and not going with the mid engine flow ...

looks like we we got something very unique.
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Old 06-21-2018, 10:23 AM
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to me, that didn't sound like redline shifting. am I wrong?
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Old 06-21-2018, 10:25 AM
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...

5.5ltr OHV TT 7500rpm is a Winner!? Easy math!

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Old 06-21-2018, 10:28 AM
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Originally Posted by AORoads View Post
to me, that didn't sound like redline shifting. am I wrong?
It sounds small block pushrod,
about 800 to 1000 turns before redline.
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Old 06-21-2018, 10:38 AM
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Seems to me like there’s more ground clearance ,
compared to C6 and C7...
maybe even as much as an inch.

Very 911 style behaviour on those runs.
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Old 06-21-2018, 10:41 AM
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... none of you engineers have estimated the 0-60mph based on the road lines and signs and frame time yet! ??



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Old 06-21-2018, 11:02 AM
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Originally Posted by AORoads View Post
to me, that didn't sound like redline shifting. am I wrong?
It was a recording in the car
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Old 06-21-2018, 11:05 AM
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Pretty tame launches.
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Old 06-21-2018, 11:18 AM
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That was definitely a Stingray with the LT1. It looks like they launched it in wet conditions, which will obviously cause wheelspin. As GM Authority said, GM wanted us to see that. I wonder what they’ll show us next...
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Old 06-21-2018, 11:26 AM
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Originally Posted by firstvettesoon View Post
... none of you engineers have estimated the 0-60mph based on the road lines and signs and frame time yet! ??







You could get the data from the strips and spacing but only if they were measured or standardized.

Or,just read the black signs to the right of the car. 0.0, 0.1, 0.2 ...

All 3 runs a distance of .2 in about 9 seconds.He cheats a bit on the second run with a rolling start before putting in the gas.

A mind is terrible thing to waste!

The Mechanical Engineer that can read a road sign.

Last edited by warhawkmcdaniel; 06-21-2018 at 11:37 AM.
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Old 06-21-2018, 11:33 AM
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Originally Posted by warhawkmcdaniel View Post
You could get the data from the strips and spacing but only if they were measured or standardized.

Or,just read the black signs to the right of the car. 0.0, 0.1, 0.2 .....

A mind is terrible thing to waste!
I did mention the signs...

May be harder to estimate the correct line as the car crosses the 0.1-0.2 signs due to perspective.

The lines "should be standard 40 foot spacing. 10 foot line- 30 foot space. and the car in right on top of them. Easier to count.

My initial calculations are an abysmal 0-60 - 5.8- 6.2 sec!

I know theses are not full on speed tests...right...

To be competitive, the car would need to be at 60mph by the time it crossed the yellow sign...more or less.

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Old 06-21-2018, 11:36 AM
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Originally Posted by firstvettesoon View Post
May be harder to estimate the correct line as the car crosses the 0.1-0.2 signs.

The lines "should be standard 40 foot spacing. 10foot line- 30 foot space.

My initial calculations are an abysmal 0-60 - 6.2 sec!

I know theses are not full on speed tests...right...

No, these are not full throttle launches. These are relatively slow, mild launches. Launching hard and running up thru the tach aggressively does not result in 3 shifts before 60 mph, all three of which executed in the lower half of the rpm range.

These launches are pretty mundane.
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Old 06-21-2018, 11:42 AM
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Originally Posted by OnPoint View Post
No, these are not full throttle launches. These are relatively slow, mild launches. Launching hard and running up thru the tach aggressively does not result in 3 shifts before 60 mph, all three of which executed in the lower half of the rpm range.

These launches are pretty mundane.
yep.

and we got relatively clear sound... !
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Old 06-21-2018, 11:49 AM
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Yeah I saw the headline and was excited, but I was a little disappointed these weren’t real 0-60 tests.

Either way it was awesome to see and I can’t wait to hear more.
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Old 06-21-2018, 12:06 PM
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Definitely not serious acceleration testing. Sounds like the max rev was about 4K rpm.
Still cool to hear - sounds like LT1.

Last edited by tomlink; 06-21-2018 at 12:07 PM.
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Old 06-21-2018, 12:20 PM
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It's also definitely rear wheel drive only with the rear end squatting down and the front lifting.
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Old 06-21-2018, 12:27 PM
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Lights out for the six cylinder theorists.
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Old 06-21-2018, 12:55 PM
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With my lack of production for the day, I have to disagree with the analysis of the video, specifically the second launch. Looking at the front and rear wheels, to me it appears that the front start spinning faster than the rear at the launch. Maybe I am just seeing something I want to see, but this could be the electric front with engine driving the rear. Again, my mind may be seeing something I want to see.

Also look at the back window, it looks narrower than previous images in my opinion. But could be the angle.

We are getting closer!!!!!
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