200 Mph
06-13-2007, 09:59 AM
#2
Racer
06-13-2007, 10:53 AM
#4
Le Mans Master
06-13-2007, 11:40 AM
#7
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An engineering buddy of mine made up a really neat spreadsheet that factors in a ton of stats for cars, like weight, coefficient of drag, tire diameter, transmission gearing, rear differential gearing, torque curves, etc... and it gives you a theoretical amount of g's the car will pull at any given speed in any given gear. It's set up so you can compare two cars and graph out their acceleration gear for gear. When I use that spreadsheet with stock gearing, I have to bump my torque curve up by 110 across the board to get 5th gear to pull to 200mph.
This theoretical MN6 car would have to have 534whp roughly to hit 200mph in 5th. For an MN12, the gearing really screws it up, because 5th gear will redline at about 180mph at 6,500rpm. To be able to get 6th gear to hit 200mph in a C5 Z06, you'd have to add somewhere around 230 foot pounds of torque (to a stock dyno curve) at all points across the curve (or at least the relevant range). The wheel hp on this Z06 would be about 625. The MN12's lower gearing really throws it off for top-end.
I'm not saying this is 100% to the gnats hair, but it's probably pretty darned close to accurate. I have the spreadsheet if anyone wants to see it... You can play with the numbers.
This theoretical MN6 car would have to have 534whp roughly to hit 200mph in 5th. For an MN12, the gearing really screws it up, because 5th gear will redline at about 180mph at 6,500rpm. To be able to get 6th gear to hit 200mph in a C5 Z06, you'd have to add somewhere around 230 foot pounds of torque (to a stock dyno curve) at all points across the curve (or at least the relevant range). The wheel hp on this Z06 would be about 625. The MN12's lower gearing really throws it off for top-end.
I'm not saying this is 100% to the gnats hair, but it's probably pretty darned close to accurate. I have the spreadsheet if anyone wants to see it... You can play with the numbers.
06-13-2007, 11:50 AM
#8
I'm not in any way disputing anyones claims or theories, but how does a 450rwhp like the c6 Z06 with the same drag cd as our cars hit 200? Is it all in optimizing the 5 gear ratio?
06-13-2007, 11:56 AM
#9
Melting Slicks
For what it's worth, I have read that the C6 Z06 tops out around 198 mph. I've seen this number published in several different magazines and articles; however, there are so many variables that could affect the top speed of any vehicle.
06-13-2007, 11:57 AM
#10
Le Mans Master
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An engineering buddy of mine made up a really neat spreadsheet that factors in a ton of stats for cars, like weight, coefficient of drag, tire diameter, transmission gearing, rear differential gearing, torque curves, etc... and it gives you a theoretical amount of g's the car will pull at any given speed in any given gear. It's set up so you can compare two cars and graph out their acceleration gear for gear. When I use that spreadsheet with stock gearing, I have to bump my torque curve up by 110 across the board to get 5th gear to pull to 200mph.
This theoretical MN6 car would have to have 534whp roughly to hit 200mph in 5th. For an MN12, the gearing really screws it up, because 5th gear will redline at about 180mph at 6,500rpm. To be able to get 6th gear to hit 200mph in a C5 Z06, you'd have to add somewhere around 230 foot pounds of torque (to a stock dyno curve) at all points across the curve (or at least the relevant range). The wheel hp on this Z06 would be about 625. The MN12's lower gearing really throws it off for top-end.
I'm not saying this is 100% to the gnats hair, but it's probably pretty darned close to accurate. I have the spreadsheet if anyone wants to see it... You can play with the numbers.
This theoretical MN6 car would have to have 534whp roughly to hit 200mph in 5th. For an MN12, the gearing really screws it up, because 5th gear will redline at about 180mph at 6,500rpm. To be able to get 6th gear to hit 200mph in a C5 Z06, you'd have to add somewhere around 230 foot pounds of torque (to a stock dyno curve) at all points across the curve (or at least the relevant range). The wheel hp on this Z06 would be about 625. The MN12's lower gearing really throws it off for top-end.
I'm not saying this is 100% to the gnats hair, but it's probably pretty darned close to accurate. I have the spreadsheet if anyone wants to see it... You can play with the numbers.
thats a cool system. I'd like to see it
06-13-2007, 12:12 PM
#11
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My 99 was run at 203 when LPE finished their work back in 99. I wouldn't attempt it now as the car is 8 years old. I've had it to 150 on the track and it seems stable enough, but 53 mph after that is a 
.
.
06-13-2007, 12:28 PM
#12
Race Director
An engineering buddy of mine made up a really neat spreadsheet that factors in a ton of stats for cars, like weight, coefficient of drag, tire diameter, transmission gearing, rear differential gearing, torque curves, etc... and it gives you a theoretical amount of g's the car will pull at any given speed in any given gear. It's set up so you can compare two cars and graph out their acceleration gear for gear. When I use that spreadsheet with stock gearing, I have to bump my torque curve up by 110 across the board to get 5th gear to pull to 200mph.
This theoretical MN6 car would have to have 534whp roughly to hit 200mph in 5th. For an MN12, the gearing really screws it up, because 5th gear will redline at about 180mph at 6,500rpm. To be able to get 6th gear to hit 200mph in a C5 Z06, you'd have to add somewhere around 230 foot pounds of torque (to a stock dyno curve) at all points across the curve (or at least the relevant range). The wheel hp on this Z06 would be about 625. The MN12's lower gearing really throws it off for top-end.
I'm not saying this is 100% to the gnats hair, but it's probably pretty darned close to accurate. I have the spreadsheet if anyone wants to see it... You can play with the numbers.
This theoretical MN6 car would have to have 534whp roughly to hit 200mph in 5th. For an MN12, the gearing really screws it up, because 5th gear will redline at about 180mph at 6,500rpm. To be able to get 6th gear to hit 200mph in a C5 Z06, you'd have to add somewhere around 230 foot pounds of torque (to a stock dyno curve) at all points across the curve (or at least the relevant range). The wheel hp on this Z06 would be about 625. The MN12's lower gearing really throws it off for top-end.
I'm not saying this is 100% to the gnats hair, but it's probably pretty darned close to accurate. I have the spreadsheet if anyone wants to see it... You can play with the numbers.
I'd love to compare spreadsheets.
06-13-2007, 01:29 PM
#15
Melting Slicks
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But seriously... isn't the c6z around 186 mph with ~450rwhp or so? I am thinking more aggressive rear end gearing will be needed, as well as 550rwhp min. Use a gear calculator and see what will bring you to redline in 6th @ 200 mph.
06-13-2007, 01:55 PM
#16
Le Mans Master
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Keeps coupes in the slow lane, where they belong.
But seriously... isn't the c6z around 186 mph with ~450rwhp or so? I am thinking more aggressive rear end gearing will be needed, as well as 550rwhp min. Use a gear calculator and see what will bring you to redline in 6th @ 200 mph.
But seriously... isn't the c6z around 186 mph with ~450rwhp or so? I am thinking more aggressive rear end gearing will be needed, as well as 550rwhp min. Use a gear calculator and see what will bring you to redline in 6th @ 200 mph.
especially ones with 500 horse Im sure the C6 Z is a 198mph car
06-13-2007, 02:04 PM
#17
Melting Slicks
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Hitting 200mph would require utilizing 6th gear. You can make up for the weak gearing with a more aggressive rear end gear. I didn't say 5th, because that would take swapping a higher gear since 5th redlines too soon. Nobody recommends swapping in a 2.73 gear to make 5th reach 200mph at redline. 
06-13-2007, 02:07 PM
#19
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Hitting 200mph would require utilizing 6th gear. You can make up for the weak gearing with a more aggressive rear end gear. I didn't say 5th, because that would take swapping a higher gear since 5th redlines too soon. Nobody recommends swapping in a 2.73 gear to make 5th reach 200mph at redline.
06-13-2007, 02:13 PM
#20
Melting Slicks
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You can do it on power alone, but spec'ing a custom rear gear or tranny is what race cars do to get it exact. Do you have a stock rear end? I'm sure a nice 4.10 swap will definately help. 