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So rumors are the z51 is a 2.8 or 2.9 sec car! Chevy confirms under 3 secs. So here is the question, how can a number of high end exotics, some with more or near same HP as the Z51 have 0-60 times of 3.6, 3.4 etc etc? They also are mid engine and some are DCT as well.
Not complaining but trying to understand what the exotics missed that Chevy did? I would be all over the engineers of those exotics questioning how we charge so much more money and have slower times???
0-60 times are all about traction and how much torque you can get to the wheels while still maintaining traction. Why do you think the big Tesla sedans can 0-60 sub 3 sec? The electric motor provide full torque off the line and AWD system provides the traction needed to get it to the ground. For the C8 the move to the mid engine put more weight over the rear wheels which helps with traction. This added weight (over the drive wheels) allows for a more aggressive launch (1st) gear coupled with the "big" V8 torque will help with the 0-60 times. I am sure there will be some launch control and the DTC will help with an ultra quick gear change during 0-60. You also have to figure improved tire tech helping with traction.
Easy answer ,:Torque! The advantage with a old fashioned push for Chevy small block compared to the exotic fuel overhead cams and turbo engines is torque comes on faster and at way lower RPM.
All this & performance ratio of 5.17:1 for the Z51 pkg per Chevy info at Carlisle. This allows the engine to rev quickly. No word yet on stock Stingray rear dif or trans ratios.
^^
Just posted on another Tread that our Nissan Murano with a CVT had a 5.17:1 dif! Means nothing until you have the gear ratios. I showed that in a C7 Z51 with a 2.97:1 first gear, if it had a 5.17:1 dif and used a 2.07:1 first gear the torque multiplication would be the same.
The Nissan Murano used it to match the Continuously Variable Transmission. The C8 may use it for the comment in the GM patent that they can use fewer gear pairs than a conventional DCT. Also reduces the diameter of that 1st gear from needing to be 2.97 times bigger than the smallest gear that can viably fit on a shaft to only 2.07 times bigger. It's not like putting a "stump puller" 5.17:1 dif in a C7!
Way back just after the ice melted and I road a Mammoth off a glacier, I ordered a '68 Plymouth Roadrunner with a "super track pack" and a heavy duty "Dana
" rear with 3:55 gears and also with a heavy duty TorqueFlight trans. Well, because of the gearing and the trans I could pull hole shots on all sorts of cars with way more horsepower and torque. Even jumping 2 lengths on a 427 Corvette, when, after he hit 2nd and then 3rd he'd fly past like a rocket. Only one car, ever stayed with me out of the hole and that was a Grand Sport Stage 2 Buick...455 cubes and over 500 lbs of torque. My point is with a proper rear ratio and a trans multiplier I think the C8 will be a "hole shot special"!! Doesn't mean it won't run out of breath in the quarter mile against cars with more cubes, turbos and horses! I know from many moons of drag racing that all the speculation about the C8 right now is still, until we see real life results, just guessing!. Just saying!
So rumors are the z51 is a 2.8 or 2.9 sec car! Chevy confirms under 3 secs. So here is the question, how can a number of high end exotics, some with more or near same HP as the Z51 have 0-60 times of 3.6, 3.4 etc etc? They also are mid engine and some are DCT as well.
Not complaining but trying to understand what the exotics missed that Chevy did? I would be all over the engineers of those exotics questioning how we charge so much more money and have slower times???
Look at my very recent pictures of specs , 4.89 rear gear, 5.17 rear gear Z51. Transmission ratios, 4,5 6,7,8 are all overdrive ratios
All this & performance ratio of 5.17:1 for the Z51 pkg per Chevy info at Carlisle. This allows the engine to rev quickly. No word yet on stock Stingray rear dif or trans ratios.
Trans ratios all the same, 1- 2.905, 2- 1.759, 3- 1.22, 4- 0.878, 5- 0.653 6- 0.508, 7- 0.397, 8- 0.329, r- 2.63, axle non z51- 4.89, Z51 - 5.17
So rumors are the z51 is a 2.8 or 2.9 sec car! Chevy confirms under 3 secs. So here is the question, how can a number of high end exotics, some with more or near same HP as the Z51 have 0-60 times of 3.6, 3.4 etc etc? They also are mid engine and some are DCT as well.
Not complaining but trying to understand what the exotics missed that Chevy did? I would be all over the engineers of those exotics questioning how we charge so much more money and have slower times???
look closely at the gear ratios in the DCT and look at the rear gear ratio's for the base and the Z51. I posted that info , read it and it will all make sense how Corvette is getting 2.9 - 3.0 to 60 mph times.. Dont forget mid engine with 60% of it weight over the rear tires plus the transmission and rear gear ratios.
People are assuming that due to the DCT having overdrive gears for 3-4-5-6-7-8 that its acceleration will be slow after the initial 0-60 time. This is an incorrect assumption. The final drive ratio of gears 2-3-4-5-6 with a 5.17 final gear are near identical to the M7's final drive gear ratios 1-2-3-4-5 when you do the math.
With near similar weight to a base C8 and a 30hp advantage along with fast DCT shifts, it will out accelerate a C7 and C7 GS throughout the 0-170 range. A Z06 and ZR1 have the HP advantage to catch and reel in a C8 after the initial 0-60.
[QUOTE=SladeX;1600055088]People are assuming that due to the DCT having overdrive gears for 3-4-5-6-7-8 that its acceleration will be slow after the initial 0-60 time. This is an incorrect assumption. The final drive ratio of gears 2-3-4-5-6 with a 5.17 final gear are near identical to the M7's final drive gear ratios 1-2-3-4-5 when you do the math.
With near similar weight to a base C8 and a 30hp advantage along with fast DCT shifts, it will out accelerate a C7 and C7 GS throughout the 0-170 range. A Z06 and ZR1 have the HP advantage to catch and reel in a C8 after the initial 0-60.[/QUOTE
The 11.3 quarter mile time proves the car is not slow after it reaches 60 mph. What people do not fully understand is typically it takes a high horse rear drive car to do 0-60 in under 3.0 sec . Take the awd and rear engine, and mid engine exotics out of this thought process. Because of this , the high horse cars also trap speed and et much faster and quicker the 495 horse C8. In other words a 2.9 0-60 time does not usually only end up with a 11.3 1/4 mile et and a low trap speed of 120. Instead we stuff like 10.9 and 130 mph trap speeds. Put that same 495 horse into the C7 and you are lucky to see 11.7 et's with maybe a 3.5 0-60 mph on OE tires and stock otherwise.
Under 3 secs for Z51- how?
Well, because of the gearing and the trans I could pull hole shots on all sorts of cars with way more horsepower and torque. Even jumping 2 lengths on a 427 Corvette, when, after he hit 2nd and then 3rd he'd fly past like a rocket.
Only one car, ever stayed with me out of the hole and that was a Grand Sport Stage 2 Buick...455 cubes and over 500 lbs of torque.
My point is with a proper rear ratio and a trans multiplier I think the C8 will be a "hole shot special"!! 
Doesn't mean it won't run out of breath in the quarter mile against cars with more cubes, turbos and horses! I know from many moons of drag racing that all the speculation about the C8 right now is still, until we see real life results, just guessing!. Just saying!
