how much horse does it take to reach 200? if the gearing stays the same on a MN6....

 

I'd guess on our cars 550-575

the new z06 can do 190 right?

 

i believe Motor Trend got a stock Z to 207

 

Wow, really? I have heard the 190 number a few times. 207 seems high. 17mph is a big difference between tests.

 

650-700hp

 

yes it is, but if a stock c5 coupe can do 180, i can see a new z doign 20 more

 

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.

 

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?

 

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.

 

i try to tell people coupes are better..........

thats a cool system. I'd like to see it

 

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 .

 

I'd like to see it as well. Im an engineer and also have my own spreadsheet that I calculated. Running the numbers it looks like it takes about 200ft-lbs of torque to get it to 200.
I'd love to compare spreadsheets.

 

isnt speed more horsepower rather than torque?

 

We had a 600RWHP MN6 w/3:42's up to 200 and climbing w/2 people in it. Thats 200 #'s more wheight to push.

 

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.

 

6th is an OD gear. you will lose MPH with it. and coupes will go faster especially ones with 500 horse

Im sure the C6 Z is a 198mph car

 

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.

 

I believe 6th gear can not handle that kind of load.

 

well, whatever it takes, its my new goal. If a new Z can do it. Im not TOOOO far off

 

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.