200 mph? What does it take?
Drifting
Joined: Jun 2001
Posts: 1,704
Likes: 459
From: Mass Mass
Dusted off some old spreadsheets 
Here is something to look at
The two RED lines are the “Rear Wheel” horsepower required, both aerodynamic and rolling resistance (using a speed based friction coefficient)
For both CD’s (0.37 from the wind tunnel test) and (0.34 from GM folklore), real world could be any place in the yellow zone
I laid in a typical horsepower curve that peaks at 480 HP, and used the ZF6 gears and a 3.07 rear axle
Check points might be
A stock L98 – 245 FWHP = 200 RWHP = 150 – 155 mph (from graph)
ZR1 – 375 – 405 FWHP = maybe 320 RWHP = 177 – 182 mph (from graph)
Seams about right?
Looks to me like 3.07 would be just about right for 480 RWHP and an attempt at 200 MPH, 3.45’s would rev out at a little under 190 MPH.
This is top speed with unlimited distance
200 mph in a mile is a totally different problem
Here is something to look at
The two RED lines are the “Rear Wheel” horsepower required, both aerodynamic and rolling resistance (using a speed based friction coefficient)
For both CD’s (0.37 from the wind tunnel test) and (0.34 from GM folklore), real world could be any place in the yellow zone
I laid in a typical horsepower curve that peaks at 480 HP, and used the ZF6 gears and a 3.07 rear axle
Check points might be
A stock L98 – 245 FWHP = 200 RWHP = 150 – 155 mph (from graph)
ZR1 – 375 – 405 FWHP = maybe 320 RWHP = 177 – 182 mph (from graph)
Seams about right?
Looks to me like 3.07 would be just about right for 480 RWHP and an attempt at 200 MPH, 3.45’s would rev out at a little under 190 MPH.
This is top speed with unlimited distance
200 mph in a mile is a totally different problem
Safety Car
Joined: Dec 2008
Posts: 3,588
Likes: 10
From: North New Jersey
I showed this video before but for those who have yet to see it, here is a Atomic Orange Z06 with cam, headers, and porting done to it. It got to 200mph pretty effortlessly! (warning, there is a little cursing due to excitement)
By the way, how do you expect to go over 170mph with 168mph rated tires???
Last edited by dogfish246; Apr 21, 2010 at 05:22 PM.
Race Director
Joined: Jan 2005
Posts: 10,641
Likes: 13
From: Slidell Louisiana
Safety Car
Joined: Dec 2008
Posts: 3,588
Likes: 10
From: North New Jersey
Dusted off some old spreadsheets
Here is something to look at
The two RED lines are the “Rear Wheel” horsepower required, both aerodynamic and rolling resistance (using a speed based friction coefficient)
For both CD’s (0.37 from the wind tunnel test) and (0.34 from GM folklore), real world could be any place in the yellow zone
I laid in a typical horsepower curve that peaks at 480 HP, and used the ZF6 gears and a 3.07 rear axle
Check points might be
A stock L98 – 245 FWHP = 200 RWHP = 150 – 155 mph (from graph)
ZR1 – 375 – 405 FWHP = maybe 320 RWHP = 177 – 182 mph (from graph)
Seams about right?
Looks to me like 3.07 would be just about right for 480 RWHP and an attempt at 200 MPH, 3.45’s would rev out at a little under 190 MPH.
This is top speed with unlimited distance
200 mph in a mile is a totally different problem
Here is something to look at
The two RED lines are the “Rear Wheel” horsepower required, both aerodynamic and rolling resistance (using a speed based friction coefficient)
For both CD’s (0.37 from the wind tunnel test) and (0.34 from GM folklore), real world could be any place in the yellow zone
I laid in a typical horsepower curve that peaks at 480 HP, and used the ZF6 gears and a 3.07 rear axle
Check points might be
A stock L98 – 245 FWHP = 200 RWHP = 150 – 155 mph (from graph)
ZR1 – 375 – 405 FWHP = maybe 320 RWHP = 177 – 182 mph (from graph)
Seams about right?
Looks to me like 3.07 would be just about right for 480 RWHP and an attempt at 200 MPH, 3.45’s would rev out at a little under 190 MPH.
This is top speed with unlimited distance
200 mph in a mile is a totally different problem
Le Mans Master
Joined: Feb 1999
Posts: 6,470
Likes: 2
From: levittown pa. usa Even a bad day with my `Vette, is better than a good day at work
St. Jude Donor '10
Honestly it's going to come to gearing and space. There was a member here that passed 200 with an LT and a big shot of juice at maxton.
Personally I'm going the easy route on my 87.
500rwhp with 2.59s,built 4l65E, and progressive shot should give me more than enough to pummel 200 mph. Granted I'm staying auto with the trans programmed to upshift at wot. But it's been done a few times, C4's in the 200's that is.
Personally I'm going the easy route on my 87.
500rwhp with 2.59s,built 4l65E, and progressive shot should give me more than enough to pummel 200 mph. Granted I'm staying auto with the trans programmed to upshift at wot. But it's been done a few times, C4's in the 200's that is.
You can get hung for using one of those
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Drifting
Joined: Jun 2002
Posts: 1,491
Likes: 6
From: Portland Oregon
Considering that known real world cars and speeds tend to fit in it nicely I'd say it's pretty darn good!
I roughed in the rwhp using the generally accepted 15% driveline loss.
L98 245chp (210rwhp), 150ish
LT-1 300chp (255rwhp), 165ish
LT-4 330chp (280rwhp), 170ish
ZR-1/Callaway We'll just round em off to 400chp (340rwhp), 180ish
Car and Driver C4 603chp (515rwhp), 212mph
ZR-1 Snakeskinner 440chp (375rwhp), 188mph
ZR-12 Conan 580chp (495rwhp), 211mph
I roughed in the rwhp using the generally accepted 15% driveline loss.
L98 245chp (210rwhp), 150ish
LT-1 300chp (255rwhp), 165ish
LT-4 330chp (280rwhp), 170ish
ZR-1/Callaway We'll just round em off to 400chp (340rwhp), 180ish
Car and Driver C4 603chp (515rwhp), 212mph
ZR-1 Snakeskinner 440chp (375rwhp), 188mph
ZR-12 Conan 580chp (495rwhp), 211mph
Last edited by locobob; Apr 21, 2010 at 08:09 PM.
Drifting
Joined: Jun 2001
Posts: 1,704
Likes: 459
From: Mass Mass
It’s much harder calculating acceleration over a fixed distance, acceleration and inertia. require a lot of compromises.
So consider this as a real “ball park” estimate of the RWHP required to reach a given speed in a mile (for a generic C4).
Last edited by SuperL98; Apr 21, 2010 at 10:06 PM. Reason: Bad post
Safety Car
Joined: Dec 2008
Posts: 3,588
Likes: 10
From: North New Jersey
Considering that known real world cars and speeds tend to fit in it nicely I'd say it's pretty darn good!
I roughed in the rwhp using the generally accepted 15% driveline loss.
L98 245chp (210rwhp), 150ish
LT-1 300chp (255rwhp), 165ish
LT-4 330chp (280rwhp), 170ish
ZR-1/Callaway We'll just round em off to 400chp (340rwhp), 180ish
Car and Driver C4 603chp (515rwhp), 212mph
ZR-1 Snakeskinner 440chp (375rwhp), 188mph
ZR-12 Conan 580chp (495rwhp), 211mph
I roughed in the rwhp using the generally accepted 15% driveline loss.
L98 245chp (210rwhp), 150ish
LT-1 300chp (255rwhp), 165ish
LT-4 330chp (280rwhp), 170ish
ZR-1/Callaway We'll just round em off to 400chp (340rwhp), 180ish
Car and Driver C4 603chp (515rwhp), 212mph
ZR-1 Snakeskinner 440chp (375rwhp), 188mph
ZR-12 Conan 580chp (495rwhp), 211mph
!
Thread Starter
Race Director
Joined: May 2003
Posts: 10,749
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Thread Starter
Race Director
Joined: May 2003
Posts: 10,749
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Cruising
Joined: Apr 2010
Posts: 14
Likes: 0
From: Dallas Texas
I've been dying to have this dialog. I have assembled the parts to build a sbc engine for a 34 ford open wheel coupe. Subsequently, I acquired my 84'. Now I'm wondering what it would take to target 200 mph in my 84'. The sbc now stands with stock bottom end, dart 180cc heads, comp cam, roller rockers and ide 44 webers. I was shooting for 350 hp. One problem is a 2 bolt block that I've been told will take 400 hp.
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http://i611.photobucket.com/albums/tt192/tombrown21