[Z06] Standing mile?
Thread Starter
Pro
Joined: Jan 2006
Posts: 597
Likes: 93
From: MA
Thanks for the info, not sure if everyone realized I was asking about standing mile top speed, from a stop you run 1 mile, the speed I was interested in is the speed the car is at at the end of the mile.
Burning Brakes
Joined: Jul 2003
Posts: 904
Likes: 36
From: Santa Cruz CA
155mph top speed? um..no.
I call major 
on 155mph area as top speed for these cars. My old 1987 C4 with a stock 240hp motor did 155mph in Motor Trend's top speed test issue. God knows I danced in the area of that number enough times before I started all the mods on the car to confirm it.
I find it incredibly hard to believe with 165 more horsepower and better aerodynamics than a C4, that a Z06 can only match the top speed of the older car. No matter how bad the gearing might be for top speed runs. It might not be the best gearing but its not that bad. I would have to dig through my old magazine tests but I recall them saying it was around 170mph which sounds a lot more feasable.
Considering that is still nearly 25-30mph slower than the C6Z (factory rated and backed up by owners at around 198mph) with only 100hp more and aero only .02 or so better I wouldn't hesitate to say even 170mph might be conservative by a few mph.
on 155mph area as top speed for these cars. My old 1987 C4 with a stock 240hp motor did 155mph in Motor Trend's top speed test issue. God knows I danced in the area of that number enough times before I started all the mods on the car to confirm it.I find it incredibly hard to believe with 165 more horsepower and better aerodynamics than a C4, that a Z06 can only match the top speed of the older car. No matter how bad the gearing might be for top speed runs. It might not be the best gearing but its not that bad. I would have to dig through my old magazine tests but I recall them saying it was around 170mph which sounds a lot more feasable.
Considering that is still nearly 25-30mph slower than the C6Z (factory rated and backed up by owners at around 198mph) with only 100hp more and aero only .02 or so better I wouldn't hesitate to say even 170mph might be conservative by a few mph.
Melting Slicks
Joined: Feb 2006
Posts: 3,191
Likes: 43
From: Scottsdale Az
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Drifting
Joined: May 2006
Posts: 1,871
Likes: 0
From: Arlington Texas, originally from San Angelo, TX
Stock C5Z gear-to-gear speeds at 6500rpm
Stock rear tire: 295/35/18
Stock MN12 trans w/3.42 rear
_GEAR___RATIO____MPH__
1st Gear (2.97:1): 49.7mph
2nd Gear (2.07:1): 71.4mph
3rd Gear (1.43:1): 103.3mph
4th Gear (1.00:1): 147.7mph
5th Gear (0.84:1): 175.9mph
Source: http://xse.com/leres/bin/gearratio?t...le=35&wheel=18
Stock rear tire: 295/35/18
Stock MN12 trans w/3.42 rear
_GEAR___RATIO____MPH__
1st Gear (2.97:1): 49.7mph
2nd Gear (2.07:1): 71.4mph
3rd Gear (1.43:1): 103.3mph
4th Gear (1.00:1): 147.7mph
5th Gear (0.84:1): 175.9mph
Source: http://xse.com/leres/bin/gearratio?t...le=35&wheel=18
Burning Brakes
Joined: Jan 2009
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From: Savannah Ga
Race Director
Joined: Dec 2006
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From: Fort Worth, Texas
Melting Slicks
Joined: Feb 2006
Posts: 3,191
Likes: 43
From: Scottsdale Az
My 5th gear is .74 compared to a Z .84, then I have taller tires with the 345/30/19s plus any expansion, and last I have a 6800rpm redline. Add it all up you can get to about 220mph in 5th.
Burning Brakes
Joined: Jan 2009
Posts: 1,204
Likes: 14
From: Savannah Ga
*depressed* haha
Melting Slicks
Joined: Sep 2003
Posts: 2,458
Likes: 105
From: Northville Michigan
1) Your 0.74:1 Fifth gear gives you 13.5% more speed than a 0.84:1 Fifth gear.
2) Your 345/30ZR19 tires are 3.5 percent taller than the stock 295/35ZR18 tires that come stock on a C5 Z06.
3) Your 6,800 rpm redline is 3.0% more than the 6,600 rpm redline on the stock LS6.
Those factors together 173 mph x 1.135 x 1.035 x 1.03 = 209 mph.
Oh yes, with my 0.563:1 Sixth gear, a 4.10:1 final drive ratio, and a 400 RWHP modifed LS6 engine, I have been at 192 mph.
(GPS verified).
Melting Slicks
Joined: Feb 2006
Posts: 3,191
Likes: 43
From: Scottsdale Az
Melting Slicks
Joined: Feb 2006
Posts: 3,191
Likes: 43
From: Scottsdale Az
My calculations come to a different top speed than the 220 mph that you stated:
1) Your 0.74:1 Fifth gear gives you 13.5% more speed than a 0.84:1 Fifth gear.
2) Your 345/30ZR19 tires are 3.5 percent taller than the stock 295/35ZR18 tires that come stock on a C5 Z06.
3) Your 6,800 rpm redline is 3.0% more than the 6,600 rpm redline on the stock LS6.
Those factors together 173 mph x 1.135 x 1.035 x 1.03 = 209 mph.
Oh yes, with my 0.563:1 Sixth gear, a 4.10:1 final drive ratio, and a 400 RWHP modifed LS6 engine, I have been at 192 mph.
(GPS verified).
1) Your 0.74:1 Fifth gear gives you 13.5% more speed than a 0.84:1 Fifth gear.
2) Your 345/30ZR19 tires are 3.5 percent taller than the stock 295/35ZR18 tires that come stock on a C5 Z06.
3) Your 6,800 rpm redline is 3.0% more than the 6,600 rpm redline on the stock LS6.
Those factors together 173 mph x 1.135 x 1.035 x 1.03 = 209 mph.
Oh yes, with my 0.563:1 Sixth gear, a 4.10:1 final drive ratio, and a 400 RWHP modifed LS6 engine, I have been at 192 mph.
(GPS verified).
Gear Ratio MPH
5 .74 217
However I have only just crossed 200mph one time.