[ZR1] The ZR1 bolt-on vrs The Sledgehammer!
When?
04-21-2010, 10:51 PM
#4
The ZR1 is rated at 205 mph, but restricted to 210 mph (which it reportedly reached in testing).
A 638hp car with a Vmax of 210 mph calculates as needing 1,129hp to reach 254 mph (pending aero). With tweaked aero, monster mods, moonshot gearing... maybe.
Top speeds beyond 200/220 mph (350 kph = 217 mph) are largely superfluous, especially in rear-drive 1,000+hp cars that are almost useless below triple-digit speeds. ...IMHO
A 638hp car with a Vmax of 210 mph calculates as needing 1,129hp to reach 254 mph (pending aero). With tweaked aero, monster mods, moonshot gearing... maybe.
Top speeds beyond 200/220 mph (350 kph = 217 mph) are largely superfluous, especially in rear-drive 1,000+hp cars that are almost useless below triple-digit speeds. ...IMHO
04-22-2010, 01:10 PM
#5
Le Mans Master
Thread Starter
?
The ZR1 is rated at 205 mph, but restricted to 210 mph (which it reportedly reached in testing).
A 638hp car with a Vmax of 210 mph calculates as needing 1,129hp to reach 254 mph (pending aero). With tweaked aero, monster mods, moonshot gearing... maybe.
Top speeds beyond 200/220 mph (350 kph = 217 mph) are largely superfluous, especially in rear-drive 1,000+hp cars that are almost useless below triple-digit speeds. ...IMHO
A 638hp car with a Vmax of 210 mph calculates as needing 1,129hp to reach 254 mph (pending aero). With tweaked aero, monster mods, moonshot gearing... maybe.
Top speeds beyond 200/220 mph (350 kph = 217 mph) are largely superfluous, especially in rear-drive 1,000+hp cars that are almost useless below triple-digit speeds. ...IMHO
But, the Sledgehammer did 254mph with a 350ci turbo at ~900hp, and 3500lb? 275 tires.
Furthermore, the Bugatti gets up there with 1000hp, but, weighs ~1200lb more?
Last edited by johnglenntwo; 04-22-2010 at 01:29 PM.
04-22-2010, 01:26 PM
#6
Melting Slicks
The Sledgehammer was more about an aero package than shear hp. If someone wanted to take the time and money to develope a body kit for the ZR1 to give it a similar aero profile then it would have no problem reaching similar speeds with "bolt-on mods" and gearing.
04-22-2010, 02:00 PM
#7
04-22-2010, 09:10 PM
#8
Melting Slicks
Weight isn't going to have an effect on top speed, just how long it takes to get there.
04-26-2010, 12:38 PM
#11
Le Mans Master
Thread Starter
Yeah, But?
Last edited by johnglenntwo; 04-26-2010 at 12:42 PM.
04-26-2010, 02:22 PM
#12
It may NOT be impossible, but it IS difficult. Anyway, the base C6 would be a better starting point than the wide-body ZR1/ZO6/GS.
I think you should build the first 260+mph ZR1.
04-26-2010, 02:36 PM
#13
Team Owner
Pro Mechanic
The drag coefficient of a C4 is .341
"The C6 coupe aero signature was shaped with more than 400 hours in the wind tunnel. They acheived a drag coefficient of .28. Pretty impressive number considering the larger front opening and the smaller dimensions of the C6 which both serve to hurt the aero signature. The C6 Z06 has a drag coefficient of .34 as published by GM, .31 as tested by a third party in their wind tunnel. Finally, the ZR1 has a drag coefficient of .36, a 6% increase over that of the Z06 due to the additional ground effects and the additional air being ducted for cooling.
"The C6 coupe aero signature was shaped with more than 400 hours in the wind tunnel. They acheived a drag coefficient of .28. Pretty impressive number considering the larger front opening and the smaller dimensions of the C6 which both serve to hurt the aero signature. The C6 Z06 has a drag coefficient of .34 as published by GM, .31 as tested by a third party in their wind tunnel. Finally, the ZR1 has a drag coefficient of .36, a 6% increase over that of the Z06 due to the additional ground effects and the additional air being ducted for cooling.
The C4's aero Cd ranged from .28 to .34 depending on the year (tires?), and the C6 starts at .31 and goes up. (Z06 .34, like you stated).
One thing to note is that for a given Cd, the C4 is more likely to be faster, b/c it has a smaller frontal area. For a given Cd, the "friction" rate may be the same C4 to C6, but there is less of it, w/the C4 because it's smaller -lower and narrower.
04-26-2010, 02:44 PM
#14
Le Mans Master
Thread Starter
"The Fender Flares!"
Tell that to generations of racers in pursuit of land speed records... and the Veyron development engineers...
It may NOT be impossible, but it IS difficult. Anyway, the base C6 would be a better starting point than the wide-body ZR1/ZO6/GS.
I think you should build the first 260+mph ZR1.
It may NOT be impossible, but it IS difficult. Anyway, the base C6 would be a better starting point than the wide-body ZR1/ZO6/GS.
I think you should build the first 260+mph ZR1.
Yes, the flares certainly are a constant drag that I didn't consider!
Thanks!
Last edited by johnglenntwo; 04-26-2010 at 02:49 PM.
04-26-2010, 02:55 PM
#15
Le Mans Master
Thread Starter
Where did you find that data? That is the opposite of what I found:
The C4's aero Cd ranged from .28 to .34 depending on the year (tires?), and the C6 starts at .31 and goes up. (Z06 .34, like you stated).
One thing to note is that for a given Cd, the C4 is more likely to be faster, b/c it has a smaller frontal area. For a given Cd, the "friction" rate may be the same C4 to C6, but there is less of it, w/the C4 because it's smaller -lower and narrower.
The C4's aero Cd ranged from .28 to .34 depending on the year (tires?), and the C6 starts at .31 and goes up. (Z06 .34, like you stated).
One thing to note is that for a given Cd, the C4 is more likely to be faster, b/c it has a smaller frontal area. For a given Cd, the "friction" rate may be the same C4 to C6, but there is less of it, w/the C4 because it's smaller -lower and narrower.
Anyway, like I have been shown the ZR1 has too many aero hinderances.
"The ZR1 bolt-on is not the perfect weapon"
Last edited by johnglenntwo; 04-26-2010 at 02:58 PM.
04-26-2010, 05:12 PM
#16
A few horsepower calculations for each Corvette bodystyle to reach 254 mph:
ZR1 = 1,129hp
ZO6 = 1,082hp
Base = 1,028hp
The Lingenfelter C5 650hp car would need 925 hp for 254 mph.
The Sledgehammer's top speed was a significant accomplishment.
ZR1 = 1,129hp
ZO6 = 1,082hp
Base = 1,028hp
The Lingenfelter C5 650hp car would need 925 hp for 254 mph.
The Sledgehammer's top speed was a significant accomplishment.
04-26-2010, 09:05 PM
#17
Team Owner
05-08-2010, 03:45 PM
#18
Melting Slicks
05-08-2010, 10:31 PM
#20
Here's another C6 versus C4 match-up that may also favor the C4 - How about a ZR1 (C6) versus ZR-1 (C4) with a completely stock, off the production line, engine for a 24 hour run? Given that the C4 ZR-1 with LT5 averaged well over 170mph (including fuel stops) and even ran the last few laps at Fort Stockton at over 190 mph, could the C6 ZR-1 do the same thing? Or would there be too much heat build up in the supercharged engine over time? The LT5 may be the most durable high performance engine the Corvette ever had; can the LS9 compete?
