200 mph run
Drifting
Joined: Dec 2009
Posts: 1,404
Likes: 7
From: Malverne New York
the 505 HP Z06 and the 638 HP ZR1 are also at the crank. Odd that 195 horsepower at the crank(over the Z06) can only achieve 2 MPH higher top speed(over the Z06).
That's 62 horses at the crank above the ZR1 but 5 MPH under the ZR1's top speed.
And the reported .29 Cd of the C7 is lower than the .34 Cd(Z06) and .35 Cd(ZR1).
Not actually bragging numbers to be proud of.
That's 62 horses at the crank above the ZR1 but 5 MPH under the ZR1's top speed.
And the reported .29 Cd of the C7 is lower than the .34 Cd(Z06) and .35 Cd(ZR1).
Not actually bragging numbers to be proud of.
Team Owner
Joined: Sep 1999
Posts: 41,732
Likes: 1,718
From: Springfield MO
Racer
Joined: Oct 2013
Posts: 398
Likes: 3
the 505 HP Z06 and the 638 HP ZR1 are also at the crank. Odd that 195 horsepower at the crank(over the Z06) can only achieve 2 MPH higher top speed(over the Z06).
That's 62 horses at the crank above the ZR1 but 5 MPH under the ZR1's top speed.
And the reported .29 Cd of the C7 is lower than the .34 Cd(Z06) and .35 Cd(ZR1).
Not actually bragging numbers to be proud of.
That's 62 horses at the crank above the ZR1 but 5 MPH under the ZR1's top speed.
And the reported .29 Cd of the C7 is lower than the .34 Cd(Z06) and .35 Cd(ZR1).
Not actually bragging numbers to be proud of.
But one thing I've learned with my 850HP Camaro ZL1 the difference between GREAT and SO/SO times is is the meats on the wheels, could that be the case in this 200 MPH run?
Melting Slicks<br><img src="/forums/images/ranks/3k-4k.gif" border="0">
Joined: Jul 2002
Posts: 3,055
Likes: 276
From: Enterprise AL
the 505 HP Z06 and the 638 HP ZR1 are also at the crank. Odd that 195 horsepower at the crank(over the Z06) can only achieve 2 MPH higher top speed(over the Z06).
That's 62 horses at the crank above the ZR1 but 5 MPH under the ZR1's top speed.
And the reported .29 Cd of the C7 is lower than the .34 Cd(Z06) and .35 Cd(ZR1).
Not actually bragging numbers to be proud of.
That's 62 horses at the crank above the ZR1 but 5 MPH under the ZR1's top speed.
And the reported .29 Cd of the C7 is lower than the .34 Cd(Z06) and .35 Cd(ZR1).
Not actually bragging numbers to be proud of.
Burning Brakes
Joined: Aug 2013
Posts: 998
Likes: 122
"the Z51 generates more down-force which inherently takes more HP to overcome at higher speeds"
(because of the high angle that it has)
I believe we have a winner.
easy to check, just test the top speed of a base car.
(because of the high angle that it has)
I believe we have a winner.
easy to check, just test the top speed of a base car.
Last edited by senah; Feb 25, 2014 at 04:25 PM.
Team Owner
Joined: Sep 1999
Posts: 41,732
Likes: 1,718
From: Springfield MO
Then you have to realize that the Z06 has a 7,000 RPM redline and the ZR1 has a 6,500 RPM redline.
With the original transmission, the ZR1 ran out of gear in 5th(6,500 RPM = 184 MPH) before it ran out of horsepower so had to shift into 6th gear. With the later transmission, the ZR1 ran out of horsepower in 5th gear(6,500 RPM = 209 MPH). Top speed(205 MPH) on the later ZR1 is reached in 5th gear as it runs out of horsepower.
For the much lower horsepower(133) Z06 it ran out of horsepower in 5th gear(7,000 RPM = 219 MPH).
The C7 base has the same 5th(.74) & 6th gears as the C6 Z06 and runs out of horsepower in 5thgear(6,500 RPM = 203 MPH) and the C7 Z51 has a .71 5th gear and it also runs out of horsepower in 5th gear(6,500 RPM = 212 MPH)
Last edited by JoesC5; Feb 25, 2014 at 04:55 PM.
Team Owner
Joined: Sep 1999
Posts: 41,732
Likes: 1,718
From: Springfield MO
If the Z51 takes more horsepower to achieve a certain speed, it's because of increased aero drag.
Which means that if the Z51 has a lower different top speed from the base C7, it must have more than .29 aero drag. Maybe GM should tell us what the Cd of the Z51 is. They have told us that the C7 Z06 will be between .35 and .37.
Drifting
Joined: Dec 2009
Posts: 1,404
Likes: 7
From: Malverne New York
I've been googling for some top speed information for this car for the last few hours. Absolutely NOTHING! I guess nobody has tested this yet of if they have, they just didn't report the results. I hope somebody tests this out.
High down force also increases aero drag, which inherently takes more horsepower to overcome at high speeds.
If the Z51 takes more horsepower to achieve a certain speed, it's because of increased aero drag.
Which means that if the Z51 has a lower different top speed from the base C7, it must have more than .29 aero drag. Maybe GM should tell us what the Cd of the Z51 is. They have told us that the C7 Z06 will be between .35 and .37.
If the Z51 takes more horsepower to achieve a certain speed, it's because of increased aero drag.
Which means that if the Z51 has a lower different top speed from the base C7, it must have more than .29 aero drag. Maybe GM should tell us what the Cd of the Z51 is. They have told us that the C7 Z06 will be between .35 and .37.
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Thread Starter
Racer
Joined: Feb 2014
Posts: 374
Likes: 92
I posted the link for entertainment value. Did not expect the controversy. I will say this as someone who has spent a lot of time going faster then most on this forum will ever approach, just not in cars. There is a vast difference between 185 and 200mph. Most claimed top speeds are exaggerated by the builders. Any car that can honestly do 200 mph is a great number to post. What I found interesting is this was done with a straight stock suspension and appeared to be handling without any vices. I don't know the speed with a stock engine however many cars attempting 200mph runs are barely in control. I give high points to the stock suspension and aerodynamics on the new Vette.
Racer
Joined: Mar 2011
Posts: 449
Likes: 8
From: Hayes Virginia
If you look at 36 seconds into the video the spoiler badge on the car says HPE600. The car only has 600 bhp according to Hennessy web site. So subtract the 15% parasitic drag from the driveline it is actually only putting down 510rwhp....
Drifting
Joined: Dec 2009
Posts: 1,404
Likes: 7
From: Malverne New York
But nos was used in addition to that.
Team Owner
Joined: Sep 1999
Posts: 41,732
Likes: 1,718
From: Springfield MO
I posted the link for entertainment value. Did not expect the controversy. I will say this as someone who has spent a lot of time going faster then most on this forum will ever approach, just not in cars. There is a vast difference between 185 and 200mph. Most claimed top speeds are exaggerated by the builders. Any car that can honestly do 200 mph is a great number to post. What I found interesting is this was done with a straight stock suspension and appeared to be handling without any vices. I don't know the speed with a stock engine however many cars attempting 200mph runs are barely in control. I give high points to the stock suspension and aerodynamics on the new Vette.
Drifting
Joined: Dec 2009
Posts: 1,404
Likes: 7
From: Malverne New York
Hopefully we'll see video's of top speed runs with the C7's soon. That'll answer a lot of questions.
Race Director
Joined: Dec 2006
Posts: 12,383
Likes: 2,905
From: Fort Worth, Texas
Coefficient of drag is not a constant at different speeds and you must multiply it by the cars frontal area to determine true drag, hope that helps. As mentioned conditions can definitely effect top speed, I heard the ZR1 went 207mph in one test though just like the 0-60 and 1/4 stats from the manufacturer they are an average not best case scenario. Regardless I honestly wasn't impressed with the H/C C7 I saw run at the Texas Mile in the spring even given the conditions.
Last edited by PRE-Z06; Feb 26, 2014 at 03:59 PM.
Melting Slicks<br><img src="/forums/images/ranks/3k-4k.gif" border="0">
Joined: Jul 2002
Posts: 3,055
Likes: 276
From: Enterprise AL
Drifting
Joined: Dec 2009
Posts: 1,404
Likes: 7
From: Malverne New York
Race Director
Joined: Dec 2006
Posts: 12,383
Likes: 2,905
From: Fort Worth, Texas
Drifting
Joined: Dec 2009
Posts: 1,404
Likes: 7
From: Malverne New York
I can't wait until the weather breaks and people start driving these cars some more. I want to see some texas mile runs and perhaps some top speed runs, similar to what Motor Trend did with Randy and the GT500.