Leaked performance data!
Racer
Joined: Sep 2015
Posts: 286
Likes: 61
From: traverse City, MI
But you have to get Z51 to get mag ride and front lift. And there will be difference in how it corners. The difference from base FE1 to FE4 is big in the C7 and will be in the C8, I would expect though that the base C8 will out corner the C7 Z51 unless the electtronic LSD makes a huge difference. I don't have the Z51 on my C7 and do have the perf exhaust. I have found the rear gets loose a lot easier in the base suspension C7 than the Z51 C7 I would put a lot of that into the E-LSD vs the mechanical LSD but all the other Z51 things add into it as well, the mag ride keeps it stuck to the road a lot better as well as the stiffer suspension. In comparing the two the Z51 rides firmer but smoother than the base suspension so you don't feel all the bumps in our crappy Michigan roads.
Racer
Joined: Sep 2015
Posts: 286
Likes: 61
From: traverse City, MI
GM already said the 193 numbers were not with the Z51 spoiler which adds drag and keeps the Z51's top end to 184. I start to get diarrhea some where are 140-150 on a straight open road so 184-193 makes no difference to me. I do like the idea fo being able to go into a turn at 60 instead of 50 or being able to hit it harder coming out of the curve. That said the Z51 spoiler adds 400 lbs of downforce at 180 so how much is it really adding at 60-90 in a curve? and how much difference will the maybe 100 lbs of downforce make maybe one of you guys more mathematical than I am can say. I do know there is a heck of difference in the C7 Z51 with mag ride vs the C7 base suspension both in cornering ability and smoothness of ride, The bas suspension is softer yes but the mag ride takes the jarring out and it is actually smoother to drive even though it has a firmer suspension. I would expect the same from the C8. Actually I'd like the Z51 but just leave the spoiler off I thnk the car looks more slippery without the spoiler.
Last edited by mdull; Aug 28, 2019 at 09:44 AM.
Banned Scam/Spammer
Joined: Mar 2005
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From: Bonita Springs FL
Gotta love the top speed stupidity. Jeeeeezus, who goes 190 mph? Why would anyone other than a professional race car driver ever do that? What is the point of going that stupid fast?
Pro
Joined: Jul 2019
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I am thinking the base C8 will do 0 to 60 in 2.9 secs now and the z51 in 2.7 secs..
We will see
Banned Scam/Spammer
Joined: Mar 2005
Posts: 8,083
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From: Bonita Springs FL
Because you can....but yeah 184 MPH is good enough...and it’s 194 mph top speed for the base model C8 and that’s one reason why this leak document is BS...there are so many wrong things with it. We need to wait for the official data!
I am thinking the base C8 will do 0 to 60 in 2.9 secs now and the z51 in 2.7 secs..
We will see
I am thinking the base C8 will do 0 to 60 in 2.9 secs now and the z51 in 2.7 secs..
We will see
You could snort an eight ball tonight also, are you going to do that?
Melting Slicks
Joined: Aug 2019
Posts: 2,247
Likes: 181
The numbers are solid. But we have somewhat known this since the reveal, with the DCT and more technology than ever in a mid engine car that can put the power down better this car is going to be a crazy amount of performance for the price.
I can't even imagine what the C8 Z06 and Grandsport will be able to pull off.
I can't even imagine what the C8 Z06 and Grandsport will be able to pull off.
Manual Z is worse at 7.87
The low rear end of 4.89 is amazing with the traction oh boy it will get the most of the 490 hp.
The Consigliere
Joined: May 2006
Posts: 22,993
Likes: 6,042
From: 2023 Z06 & 2010 ZR1
Burning Brakes
Joined: Jan 2019
Posts: 1,101
Likes: 409
From: Lake Placid, FL
Because you can....but yeah 184 MPH is good enough...and it’s 194 mph top speed for the base model C8 and that’s one reason why this leak document is BS...there are so many wrong things with it. We need to wait for the official data!
I am thinking the base C8 will do 0 to 60 in 2.9 secs now and the z51 in 2.7 secs..
We will see
I am thinking the base C8 will do 0 to 60 in 2.9 secs now and the z51 in 2.7 secs..
We will see
The Z06 version will just teleport itself to 60 then.
Last edited by LuisZ51; Aug 27, 2019 at 07:30 PM.
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Race Director
Joined: Sep 2014
Posts: 11,905
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Where I am at it's hard to find the opportunity these days to put the hammer down.
The guys I see locally in Corvettes drive like little old ladies.
Last edited by sunsalem; Aug 27, 2019 at 07:44 PM.
Race Director
Joined: Dec 2006
Posts: 12,363
Likes: 2,899
From: Fort Worth, Texas
A DCT is my favorite transmission type so I am a happy camper the C8 has one. Regarding the A8, my limited experience with it showed that when left in auto mode it shifted well. In manual mode, not so much. Manual shifts with the A8 are clearly not as responsive... up or down.... as a good DCT. Auto mode felt fine but auto mode on the track would overheat more quickly on a hot day by keeping revs high consistently.
OK, I have done more spreadsheet crunching on the gear ratios and the results are "interesting"
If I got the rear tire diameters correct from Tire Rack, the Z51 is looking at top speed of 35.5mph in 1st and 58.7mph in 2nd. These are stunningly low speeds. Of course maybe DCT yada yada yada. For AutoX this is worthless, unless 3rd could be made to serve. Typically for a stock high power car the sweet spot is 68-74mph for 2nd or at least some gear that is serviceable in this range. 3rd gear on Z51 is 84.5mph.
Let's look at the ratios for the track. The gap from 3rd to 4th is huge for a track car. 84.5mph 3rd to 117.6mph for 4th! That is a 33mph spread which is NOT close ratio. Worse at 41mph to 5th at 158.19mph, 6th 203, 7th 260mph etc etc. Now these top ratios are for cruising not top end. 7th gives 80mph cruise rpm at 2029 and 8th is 1700-ish.
Tracks in the US are typically what I call "regular" vs "jumbo" Regular tracks have a top speed in a street corvette of 130-150mph range. The big tracks like Sebring, COTA, Road America etc. have top speeds in the 160-180mph range. Typical weekend warriors just use the taller cruise gear on the big track where necessary. Hardcore racers have different setups with different gearing.
Maybe these numbers are just the "new normal" for DCT, but they don't seem fit for purpose. Hence given the conflict with previously published Chevy Final drive ratios, these are suspect in my mind.
Which I see changes could be being made, which I could buy about the final drive, I don't buy for the internal gear ratios. FAR too much validation required along with the ECU tuning, ride and handling etc to wholesale change the ratios at this late date. Just my $0.02.
If I got the rear tire diameters correct from Tire Rack, the Z51 is looking at top speed of 35.5mph in 1st and 58.7mph in 2nd. These are stunningly low speeds. Of course maybe DCT yada yada yada. For AutoX this is worthless, unless 3rd could be made to serve. Typically for a stock high power car the sweet spot is 68-74mph for 2nd or at least some gear that is serviceable in this range. 3rd gear on Z51 is 84.5mph.
Let's look at the ratios for the track. The gap from 3rd to 4th is huge for a track car. 84.5mph 3rd to 117.6mph for 4th! That is a 33mph spread which is NOT close ratio. Worse at 41mph to 5th at 158.19mph, 6th 203, 7th 260mph etc etc. Now these top ratios are for cruising not top end. 7th gives 80mph cruise rpm at 2029 and 8th is 1700-ish.
Tracks in the US are typically what I call "regular" vs "jumbo" Regular tracks have a top speed in a street corvette of 130-150mph range. The big tracks like Sebring, COTA, Road America etc. have top speeds in the 160-180mph range. Typical weekend warriors just use the taller cruise gear on the big track where necessary. Hardcore racers have different setups with different gearing.
Maybe these numbers are just the "new normal" for DCT, but they don't seem fit for purpose. Hence given the conflict with previously published Chevy Final drive ratios, these are suspect in my mind.
Which I see changes could be being made, which I could buy about the final drive, I don't buy for the internal gear ratios. FAR too much validation required along with the ECU tuning, ride and handling etc to wholesale change the ratios at this late date. Just my $0.02.
Banned Scam/Spammer
Joined: Feb 2007
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0-60 times.
I think the base will be 3.0 and the Z51 at 2.9. At the reveal they said under 3.0 seconds but that car on stage was a Z51.
Or perhaps 2.9 for base and 2.8 Z51? That would be even sweeter. 2019 ZR1 is 2.85 and Ford GT is 2.9 I believe.
Or perhaps 2.9 for base and 2.8 Z51? That would be even sweeter. 2019 ZR1 is 2.85 and Ford GT is 2.9 I believe.
Last edited by faninc; Aug 27, 2019 at 10:43 PM.
Race Director
Joined: Aug 2019
Posts: 12,351
Likes: 14,183
From: Central Illinois
It's called drag, that spoiler on the back of a Z51 that produces 400 pounds of down force, also is slowing the top end.
Last edited by Phil1098; Aug 27, 2019 at 11:05 PM.
Burning Brakes
Joined: Jun 2013
Posts: 1,193
Likes: 342
From: St. Louis MO
Gents, WRT to skipad numbers, ALL ME's (with the exception of the Ford GT) have lower skidpad lateral G limits than 50/50 FE cars. The C7 Z51, Z06 and ZR1 all had spectacular skidpad numbers (1.07/1.17/1.18). The C8, Ferrari 458/488 and the McLarens (all of them) have skidpad numbers around 1.0-1.05 g's . This is due to the 40/60 weight distribution. The skidpad is not a dynamic maneuver - the car is not accelerating longitudinally.
Consequently a higher skidpad number does not predict better track performance where turns are greatly effected by how the car brakes going in to the apex and (especially) how it accelerates coming out of the apex. Based on the numbers a C8 should out-handle a C7Z06 on most smaller technical tracks like Lime Rock or VIR, but may suffer some disadvantage on higher speed tracks like Road America where the cars can get up to 180 mph and straight-line acceleration above 100 mph is an advantage. For the average driver, the combination of more benign handling and the DCT will make most people faster in a C8 than in a C7Z51 or a C7Z06.
Consequently a higher skidpad number does not predict better track performance where turns are greatly effected by how the car brakes going in to the apex and (especially) how it accelerates coming out of the apex. Based on the numbers a C8 should out-handle a C7Z06 on most smaller technical tracks like Lime Rock or VIR, but may suffer some disadvantage on higher speed tracks like Road America where the cars can get up to 180 mph and straight-line acceleration above 100 mph is an advantage. For the average driver, the combination of more benign handling and the DCT will make most people faster in a C8 than in a C7Z51 or a C7Z06.
Burning Brakes
Joined: Jun 2013
Posts: 1,193
Likes: 342
From: St. Louis MO
One other point - the C7 NEEDED the Z51 to go fast without drama. The C8 probably does not, given its superior balance and the ability to adjust the coil-overs and change tires (Hoosier slicks for instance). I suspect most drivers would be just as happy with the base model as the Z51, unless they need the HD brakes and cooling for long track runs.
Racer
Joined: Sep 2015
Posts: 286
Likes: 61
From: traverse City, MI
GM already said the sub 3 second 0-60 was with the Z51, and the base won't do it that quick, has to do with gearing and tires, have read the base will do it in 3.0 but I think that is only speculation.
Drifting
Joined: Mar 2018
Posts: 1,361
Likes: 400
From: DFW TX
This obviously isn't an actual product released by GM. Way too many formatting issues and even a typo in the spelling of "cappicity". Someone entered in a bunch of made up data into an Excel spreadsheet and then printed it and had it bound. Some of the information is contradictory to what GM has already stated and the braking from 60-0 couldn't possibly be right. I think '10 V6 Camaros could stop from 60mph in 112 ft. '99 Z28 Camaros could do it in 120 ft.
Team Owner
Joined: Sep 1999
Posts: 41,732
Likes: 1,718
From: Springfield MO
I would say 121 mph in the quarter isn't too shabby. It's not like they shoveled a two speed Powerglide into the car. Plus, while aerodynamics certainly help, any vehicle that can reach 194 mph top speed, doesn't exactly nose over at 120 mph. It will still be pulling hard at 150 mph.
495 HP with a .32 Cd = 193 MPH in the C8.
505 HP with a ,34 Cd = 198 MPH in a C6 Z06.
Something is not right, and we know the C6 Z06 will do 198 MPH right out o the dealer's showroom. It took the C6 ZR1 with it's 638 HP and a .35 Cd to run 7 miles per hour faster than the C6 Z06.
My C6 Z06 sure doesn't nose over at 150 MPH and it only takes 17.4 seconds to get to 150 MPH.. It pulls hard up to 160 MPH when it's time to shift into 5th gear. Then it noses over due to terrible .74:1 5th gear gearing. Takes forever to get to 198 MPH, but it gets there in 5th gear. Sure wish that GM had installed the ,82:1 5th gear from the C6 ZR1 into the C6 Z06.
Melting Slicks
Joined: Nov 2012
Posts: 3,163
Likes: 686
From: SUFFIELD CONNECTICUT
This obviously isn't an actual product released by GM. Way too many formatting issues and even a typo in the spelling of "cappicity". Someone entered in a bunch of made up data into an Excel spreadsheet and then printed it and had it bound. Some of the information is contradictory to what GM has already stated and the braking from 60-0 couldn't possibly be right. I think '10 V6 Camaros could stop from 60mph in 112 ft. '99 Z28 Camaros could do it in 120 ft.
Racer
Joined: Jul 2019
Posts: 373
Likes: 119
Agreed! Here in Kalifornication...you get caught going over 100mph, game over! Your Vette is Impounded on a flat bed (if your lucky it’s a flat bed). No eye hooks in the front or rear locations because your in hand cuffs sitting in the back of the cruiser and the popo couldn’t care less. Your new C8 is dragged onto the flatbed scraping either your front splitter or rear facia.
If if none of that got your attention, try this. Whenever I think of those speeds, I think of catastrophic tire failure. When these tire speed ratings are publish, it’s under optimum conditions with no tire flaws. If you have tire failure at that speed, you’d have to be a pro to recover, maybe not even then. Then it would be the cruise back seat you’d be in.
If if none of that got your attention, try this. Whenever I think of those speeds, I think of catastrophic tire failure. When these tire speed ratings are publish, it’s under optimum conditions with no tire flaws. If you have tire failure at that speed, you’d have to be a pro to recover, maybe not even then. Then it would be the cruise back seat you’d be in.