Must have been listening to Barry/B.O.

 

First of all 11.1 and 10.9 are damn close. 2nd, the full second difference to 60MPH is achieved by super traction of the C8. That advantage goes away as the MPH goes up limiting that great 0-60 2.8 seconds advantage. If those two cars were to do side by side pull from a 60 mph roll to say 120 mph it would be close. A8 C7 Z51 versus C8 Z51 both 1lt cars

 

I can see how the traction advantage is only during the 0-60 portion of the 1/4 mile run. But it’s a full second faster in that period. What I don’t understand is why it doesn’t at least retain that 1 second quicker advantage throughout the rest of the run. Given more HP, faster shifting, and maybe better aero than the C7 I would think it would actually have an additional advantage during the last 7 seconds of the run, as well....resulting in an overall ET improvement of more than 1 second. I’m not sure what I’m missing.

 

It just doesn't work that way. At speeds of 60-115 you are covering a lot more ground at a much higher speed. Take the GTO, 5.7 vs 6.0 the 6.0 is faster to 60 by .7 seconds but it's only 2-4 tenths faster with equal drivers.

 

There really is not a horsepower difference as the C8 is 200 lbs heavier than a base C7. Also, it takes more and more horsepower to gain MPH trap speed in the 1/4 mile . What it takes for horsepower to go from a 95 mph trap speed to say 105 versus 115 mph to 120 in a same weight car is not equal. At one time a 10 horse gain could get you a tenth on the end, but that was when there wasnt the kind of horsepower we see today. To go from low 11's to high tens with no other changes other than horsepower it might take a minimum of 75 hp imo.

 

I wonder how many transmission shifts there are in the run. Maybe 1 in the 0-60 range, but several in the 60+ range, during the last 8 seconds of the run. Each shift on the DCT C8 is much more efficient than the C7...seems like that alone would be worth several tenths.

 

Versus a manual yes, but not a A6 or a A8

 

Chevy engineers credit a portion of the improved 0-60 time to the faster-shifting DCT, compared to any trans available in the C7.

 

This is a great analogy. Hopefully it helps some understand more about the car.

 

When the base car only shifts once to getting to 60MPH, its a very small portion when comparing it to another automatic. Gear ratio and grip is 99%of it. The base car has a 4.89 final drive and a 5.17 in the Z51 car. That and decent tire, and 60% of the weight of the car over the rear wheels is where its at.

 

Not only is a DCT shift faster than a single clutch transmission, before the first gear clutch fully disengages the second gear clutch is applying torque. Therefore there is no period of time you are coasting. It is truly a revolutionary advancement. I am so looking forward to drive GM’s version.

 

Where the C8 is going to shine over C7 is on an unprepped surface with wider rear tires and rear weight bias taking better advantage of the torque multiplication from better gearing, 1/4 mile times on the street show the 0-60 gains carrying over vs the C7. At a dragstrip the better published 0-60 time isn’t as big of a delta as the C7 doesn’t have a traction issue there, the C7 0-60 time at a dragstrip is low 3s with a 1.6 60’. The C6Z06 at the dragstrip was high 2s like my 422rwhp manual C5 that did a 2.8 on a 1.49 60’, my stock manual C6GS with a 1.61 on a drag radial was a 3.1 fwiw. Hope that helps, Merry Christmas to all!

 

ceUOTE=PRE-Z06;1600698997]Where the C8 is going to shine over C7 is on an unprepped surface with wider rear tires and rear weight bias taking better advantage of the torque multiplication from better gearing, 1/4 mile times on the street show the 0-60 gains carrying over vs the C7. At a dragstrip the better published 0-60 time isn’t as big of a delta as the C7 doesn’t have a traction issue there, the C7 0-60 time at a dragstrip is low 3s with a 1.6 60’. The C6Z06 at the dragstrip was high 2s like my 422rwhp manual C5 that did a 2.8 on a 1.49 60’, my stock manual C6GS with a 1.61 on a drag radial was a 3.1 fwiw. Hope that helps, Merry Christmas to all![/QUOTE]

This. 0-60 ft times make a big difference. for example, my 1980 drag car ran 9.2 at 132 mph with a 60 ft of 1.31 with only about 550 hp at the tire

Turbo vette I have runs 9.84 with a 0-60 of 1.52 with a trap speed of 144 with about 800 at the tire

hook and book will be lots better on the c8 and even with less hp, traction limited big hp vettes will need time to "run down" that big starting line advantage.

since the key advantage of the big hp cars comes at 60 mph and up, they don't ET all that much better even though pulling a much higher trap speed.

Best example of this was my old buddy chuck mallet who stuffed turbo ls7 into a sky making 1100 hp at the tire

couldn't hook for anything and run 11.5s but at 154 mph

putting the power down makes a huge difference at the digs.

 

Should hook up better. Wonder why Edmund's couldn't get it to though? On the road. Not at a drag strip like the 2.8 and 2.9s were (according to them on an "unprepped surface" but drag strip non driven on asphalt still has much more grip than any driven on road unless freshly paved).

We will see soon enough.

 

? "The Cat of the bag" Hey have fast have you gone yet since you know the "secret sauce" 50+ HP, no way and we do always run the same fuel for consistency. That is the real secret sauce, Will practices and practices and exactly how long to do the burnout, where to launch the car etc. Everytime we leave in it, all the variables that we can control are all the same.

 

Can't wait for the tracks to open, we have a C8 waiting to make some passes.

 

The facts and data from the tests proved it case closed!

And I do agree that spending he time perfecting the launch and removing as many variable as possible are one of the most significant keys to killer times.

 

What’s your prediction?

 

Weight (200 pounds of weight).

 

You know I think it’s got potential. It l’s not going as fast as the ZR1 obviously but it has a ton of advantages over the C7 with LT1. I think going away from launch control and using the clutch is the way to go. We will see where it likes to launch and how Z mode will work into it. I think we will see high 10’s with no add ons maybe tires. I guess we will find out what the clutch will like.