ioutrun

So interesting info has come up from a fellow member..

"Dug out my old car and driver on the 2009 z06 and zr1 and compared those ratings to the jan 2015 car and driver road test of the c7Z06 a8

The Zr1 is 2 seconds faster to 150mph than the c7z06. The c6Z06 is a half second quicker to 150mph than the c7z06.

Jan 15 Car and driver lists the c7z A8 with 2.41 final drive gear ratio.
1st gear is 4.56 2nd is 2.97 3rd is 2.08 4th is 1.69 5th is 1.27 6th is 1.0
7th is .85 8th is .65

for the 2009 z06 car and driver dec 2008 lists 3.42 final drive ratio
1st is 2.66 2nd=1.78 3rd=1.3 4th=1.oo 5th=.74 6th=.5


I would imagine chevy had to really mess around with the gear ratios final drive and in the transmission to meet fuel economy standards and to deal with the 4 cylinder deactivation. Thats why the c7z along with the 400 pound extra weight is not performing as well as it should with all that horsepower and torque.*

as far as dimensions. the c6Zs are about 1 inch shorter and 1 inch narrower then the c7z. I think this refers to the body of the car itself.

The C6Zs have a half inch wider rear track and a about 3/4 of an inch wider front track then the c7z.

The C7z has about a 1 inch longer wheel base.

Car and driver didn't post any detail specs on the C7Z trans and rear end ratio specs for the manual 7. But quarter mile times are about equal to the c6Z06 on ET and MPH.

Car and driver lists top speed of the c7Z a8 at 185 mph. This is actually 1 mph slower the a base c6 Z51 as tested in 2009.

The C7Z pulls 1.19 lateral G's cornering with the z07 package. The C6Z06 pulled 1.06 on run craps. I think the c6z with cups pulled 1.13g.

The C6Zr1 is still the king of acceleration and top speed"

Something to think about..

JackTripper

Here we go.

JoesC5

It all boils down to the fact that the C7 Z06 with the A8 has to shift into 5th gear at 125 MPH as does the 2009 C6 Z06(into 4th gear). But, the C7 Z06 with the M7 and the C6 Z06 and the C6 ZR1 have the gearing advantage between 125 and 150 MPH(actually the C6 Z06 has the gearing advantage up to 160 MPH at it doesn't have to shift until it reaches 7,000 RPM vs the 6,500 RPM shift points on the C7 Z06 and the C6 ZR1.

At 125MPH is where the C7 Z06 starts falling on it's face, so why do you think the C7 Z06(either the A8 or the M7) starts falling behind by that half second at 150 MPH vs the C6 Z06 that has 145 less horsepower?

PeteZ06

Good info.. Although I'm sure these runs are made by different drivers.. At different altitudes.. In different weather conditions.

I too believe the ZR1 will come out on top in terms of speed.

heavychevy

Yeah, different conditions but 2 whole seconds is a big gap to the ZR1 (that's like 4-5 bus lengths at 150 mph). Remember the C6Z used to fall flat up top as well so it makes sense that they would be neck and neck, and conditions would really matter.

What are the 0-60 times on these tests, because if the C7Z launched faster, that means it even helped the gap some, but up top the ZR1 is running, not walking away.

I'm really interested to see how this thing does at Laguna and VIR Grand.

Greg Quillen

It's the massive down force. Even the stage 1 has a lot more down force then the Z51 C7.. Which I've seen 180mph and heard of 190mph don't know if z51 or base..
When I do the top speed events I'm take off the splitter and spoiler. See how much that helps

JoesC5

The C6 Z06 does not fall flat until it shifts into 5th gear at 160 MPH with it's .74:1 5th gear. Above 160, the early ZR1's had the gearing advantage(.82:1 5th gear) but that changed with the later ZR1's that got the transmission(for fuel economy) that had the high 5th and 6th gears as the C6 Z06 has.

Denstoy968

It gets worse if you go to 160mph - the C7Z takes 17.8 sec to hit 150mph and then....gulp....another 5.1 seconds to hit 160mph as C&D shows it hitting 160mph in 22.9 seconds!!

130mph to 160mph takes an entire 11 seconds with the A8. Compare that with some other cars in its class and it doesn't settle well - ie Challenger Hellcat that takes only 8.5 seconds to run 130 to 160mph.

raj

I did a gearing analysis of A8 in the the C7 Z06 - you can read my observations and the inputs of a few others on this thread. The Z06 M7 ratios for gears 1-6 are identical to the C6 ZR1. The acceleration comparison chart that I generated shows the ZR1 out gunning both versions of the Z06 from ~95 mph on up. Obviously, we'll need more test results to confirm this behavior. If true, it's probably driven primarily by aerodynamics and I suspect that even the base Z06 has a higher drag area (A*Cd) than the ZR1 which may be a product of the exceptional down-force that GM has attributed to the new Z06. This may then explain why they needed such a high power output to achieve this level of straight-line performance; thereby also answering those like me that have wondered why GM didn't go with a direct injected LS7 variant making 550-575 HP.

In short, the raison d'etre of the new Z06 is to demolish just about anything street legal on a race track and I am in the camp of those that believe this car will be quicker than the Ferrari Speciale, the GT-R Nismo, the 991 GT3 and the Viper TA on just about any track in this country. If we're proved right, that's a stellar achievement in itself, and the resultant sacrifice in top end acceleration is the price we pay for it. Yes, the C6 ZR1 remains the fastest Corvette to date and will walk the Z06 on any highway run if the driver is not a factor; for everything else, the Z06 will be the ticket.