200 mph?
03-16-17 | 06:30 PM
#16
Pole Position
Joined: Aug 2013
Posts: 2,629
Likes: 250
From: CA
The correct answer is that the power required changes exponentially with the speed. There is no flat answer. I too had physics, at the college level. It does not require 8 times the power to reach 200 mph from 100 mph. But please, continue trying to convince me...
Just for fun:
https://metinmediamath.wordpress.com...ugatti-veyron/
v = ( 2 · P / (c · D · A) )1/3
RCF:
P = 467hp = 348242 watts (obvious...)
c = .33 (drag coefficient)
D = 1.25 (air resistance at sea level)
A = 2.562 square meters (area = height * width = 72.6" * 54.7")
velocity = (2 * 348242 / ( .33 * 1.25 * 2.562))^1/3 = 87.023 m/s = 194.7 mph
Gallardo:
P = 493hp = 367630 watts
c = .36
D = 1.25
A = 2.215 square meters (74.8" * 45.9")
velocity = ( 2 * 367630 / (.36 * 1.25 *2.215))^1/3 = 90.354 m/s = 202.1 mph
This method is flawed, but it's a nice ballpark. I still believe the RC F will not likely go over 190 mph in stock form, and I'm aiming more at 185-190 mph myself. I don't care what the numbers say. I know from first hand experience what my car will do. This isn't my first rodeo... But if you trust the formula above (which does not account for rolling resistance, drivetrain loss, etc...), then it will travel at a velocity of nearly 195 mph.
It's been fun...
Just for fun:
https://metinmediamath.wordpress.com...ugatti-veyron/
v = ( 2 · P / (c · D · A) )1/3
RCF:
P = 467hp = 348242 watts (obvious...)
c = .33 (drag coefficient)
D = 1.25 (air resistance at sea level)
A = 2.562 square meters (area = height * width = 72.6" * 54.7")
velocity = (2 * 348242 / ( .33 * 1.25 * 2.562))^1/3 = 87.023 m/s = 194.7 mph
Gallardo:
P = 493hp = 367630 watts
c = .36
D = 1.25
A = 2.215 square meters (74.8" * 45.9")
velocity = ( 2 * 367630 / (.36 * 1.25 *2.215))^1/3 = 90.354 m/s = 202.1 mph
This method is flawed, but it's a nice ballpark. I still believe the RC F will not likely go over 190 mph in stock form, and I'm aiming more at 185-190 mph myself. I don't care what the numbers say. I know from first hand experience what my car will do. This isn't my first rodeo... But if you trust the formula above (which does not account for rolling resistance, drivetrain loss, etc...), then it will travel at a velocity of nearly 195 mph.
It's been fun...
I have a headache now just looking at all the equations and numbers. 😁😂😂😂😁 Reminds me of physics class in college. While I did well in it, I just can't see myself doing it for life. I guess that's why I'm not an engineer (while many friends of mine are).
I think I'll keep my RCF to under TRIPLE digit mph for now.
03-16-17 | 06:39 PM
#17
Lead Lap
Joined: Jun 2016
Posts: 750
Likes: 59
From: Naples, FL
I have a headache now just looking at all the equations and numbers. 😁😂😂😂😁 Reminds me of physics class in college. While I did well in it, I just can't see myself doing it for life. I guess that's why I'm not an engineer (while many friends of mine are).
I think I'll keep my RCF to under TRIPLE digit mph for now.
I think I'll keep my RCF to under TRIPLE digit mph for now.
I'll be sure to share a video of a RC F breaking 200 when I find one.
03-17-17 | 01:17 PM
#18
Pole Position
Joined: Aug 2013
Posts: 2,629
Likes: 250
From: CA
I'm thinking for sure someone tried on the race track with a RCF. How fast did that driver, STIG on Top Gear do?
There us a video showing an RCF doing 346 kph which is 215 mph.
There us a video showing an RCF doing 346 kph which is 215 mph.
Last edited by lexusrus; 03-17-17 at 02:25 PM.
03-17-17 | 01:36 PM
#19
Lead Lap
Joined: Jun 2016
Posts: 750
Likes: 59
From: Naples, FL
I apologize. I suppose that I am not as intelligent as yourself as I can not even figure out why you are posting replies to me... Do you have a point?
03-17-17 | 01:47 PM
#20
Lead Lap
Joined: Jun 2016
Posts: 750
Likes: 59
From: Naples, FL
03-17-17 | 03:00 PM
#21
Lead Lap
Joined: Jun 2016
Posts: 750
Likes: 59
From: Naples, FL
I'm thinking for sure someone tried on the race track with a RCF. How fast did that driver, STIG on Top Gear do?
There us a video showing an RCF doing 346 kph which is 215 mph.
https://youtu.be/iTCINanVxxE
There us a video showing an RCF doing 346 kph which is 215 mph.
https://youtu.be/iTCINanVxxE
03-17-17 | 03:56 PM
#22
Pole Position
Joined: Aug 2013
Posts: 2,629
Likes: 250
From: CA
03-17-17 | 06:23 PM
#23
Lead Lap
Joined: Jun 2016
Posts: 750
Likes: 59
From: Naples, FL
I found this in the IS F forum while searching around:
https://www.clublexus.com/forums/is-...top-speed.html
That IS F reportedly ran a top speed of 186 mph with the limiter removed. So I decided to plug the IS F numbers into the formula above to see what the formula reported for the IS F and how it compared to the RC F:
v = ( 2 · P / (c · D · A) )^1/3
IS F:
P = 416hp = 310211 watts
c = .30
D = 1.25
A = 2.569 square meters
velocity = (2 * 310211 / ( .33 * 1.25 * 2.569))^1/3 = 86.357 m/s = 193.2 mph
RC F:
P = 467hp = 348242 watts
c = .33
D = 1.25
A = 2.562 square meters
velocity = (2 * 348242 / ( .33 * 1.25 * 2.562))^1/3 = 87.023 m/s = 194.7 mph
I think my guess of 185-190 mph top speed for a stock RC F is a pretty good estimate. But as for the RC 350, it's not going to touch 197 mph, or even 179 mph while stock. Not even with bolt ons. But I'm sure most people already know that... My guess for the RC 350 top speed would be 160 mph for the rwd version. That's based purely on the 306 hp.
https://www.clublexus.com/forums/is-...top-speed.html
That IS F reportedly ran a top speed of 186 mph with the limiter removed. So I decided to plug the IS F numbers into the formula above to see what the formula reported for the IS F and how it compared to the RC F:
v = ( 2 · P / (c · D · A) )^1/3
IS F:
P = 416hp = 310211 watts
c = .30
D = 1.25
A = 2.569 square meters
velocity = (2 * 310211 / ( .33 * 1.25 * 2.569))^1/3 = 86.357 m/s = 193.2 mph
RC F:
P = 467hp = 348242 watts
c = .33
D = 1.25
A = 2.562 square meters
velocity = (2 * 348242 / ( .33 * 1.25 * 2.562))^1/3 = 87.023 m/s = 194.7 mph
I think my guess of 185-190 mph top speed for a stock RC F is a pretty good estimate. But as for the RC 350, it's not going to touch 197 mph, or even 179 mph while stock. Not even with bolt ons. But I'm sure most people already know that... My guess for the RC 350 top speed would be 160 mph for the rwd version. That's based purely on the 306 hp.
Last edited by Davew77; 03-17-17 at 06:40 PM.
03-17-17 | 09:52 PM
#24
Pole Position
Joined: Aug 2013
Posts: 2,629
Likes: 250
From: CA
Agreed. I believe you are right. No VW scandal here. RCF is good for what it is. No regrets. I'll TRY to keep it under TRIPLE digits,. Haha. 😁😀
I found this in the IS F forum while searching around:
https://www.clublexus.com/forums/is-...top-speed.html
That IS F reportedly ran a top speed of 186 mph with the limiter removed. So I decided to plug the IS F numbers into the formula above to see what the formula reported for the IS F and how it compared to the RC F:
v = ( 2 · P / (c · D · A) )^1/3
IS F:
P = 416hp = 310211 watts
c = .30
D = 1.25
A = 2.569 square meters
velocity = (2 * 310211 / ( .33 * 1.25 * 2.569))^1/3 = 86.357 m/s = 193.2 mph
RC F:
P = 467hp = 348242 watts
c = .33
D = 1.25
A = 2.562 square meters
velocity = (2 * 348242 / ( .33 * 1.25 * 2.562))^1/3 = 87.023 m/s = 194.7 mph
I think my guess of 185-190 mph top speed for a stock RC F is a pretty good estimate. But as for the RC 350, it's not going to touch 197 mph, or even 179 mph while stock. Not even with bolt ons. But I'm sure most people already know that... My guess for the RC 350 top speed would be 160 mph for the rwd version. That's based purely on the 306 hp.
https://www.clublexus.com/forums/is-...top-speed.html
That IS F reportedly ran a top speed of 186 mph with the limiter removed. So I decided to plug the IS F numbers into the formula above to see what the formula reported for the IS F and how it compared to the RC F:
v = ( 2 · P / (c · D · A) )^1/3
IS F:
P = 416hp = 310211 watts
c = .30
D = 1.25
A = 2.569 square meters
velocity = (2 * 310211 / ( .33 * 1.25 * 2.569))^1/3 = 86.357 m/s = 193.2 mph
RC F:
P = 467hp = 348242 watts
c = .33
D = 1.25
A = 2.562 square meters
velocity = (2 * 348242 / ( .33 * 1.25 * 2.562))^1/3 = 87.023 m/s = 194.7 mph
I think my guess of 185-190 mph top speed for a stock RC F is a pretty good estimate. But as for the RC 350, it's not going to touch 197 mph, or even 179 mph while stock. Not even with bolt ons. But I'm sure most people already know that... My guess for the RC 350 top speed would be 160 mph for the rwd version. That's based purely on the 306 hp.
01-28-20 | 06:11 PM
#25
Driver School Candidate
Joined: Jun 2018
Posts: 1
Likes: 0
From: CA
Theoretical Top Speed RCF (Stock)
After brief calculations, I found out that when stock the RCF can 'theoretically' reach up to 194.9 mph / ~ 313 km/h; however, RL conditions are never perfect.
Personal story:
Two years ago I was driving with some friends (3 ~ 200lbs peeps in the car) on some mountain rods near Palomar Mt. in CA. I found a 1.6km long stretch that was ever-so-slightly uphill, and I hit the gas till the car reached 169 on the odometer then had to break because the straight ended and the road started to curve.
I recently dyno'd my car on a dyno jet (In 6th gear for the 1:1 ratio) and got 397.57whp and 346.21wtq.
Now I know a 2-mile stretch that is 99% of the time empty from midnight- 3 am; I aim to test my car out once more.
Personal story:
Two years ago I was driving with some friends (3 ~ 200lbs peeps in the car) on some mountain rods near Palomar Mt. in CA. I found a 1.6km long stretch that was ever-so-slightly uphill, and I hit the gas till the car reached 169 on the odometer then had to break because the straight ended and the road started to curve.
I recently dyno'd my car on a dyno jet (In 6th gear for the 1:1 ratio) and got 397.57whp and 346.21wtq.
Now I know a 2-mile stretch that is 99% of the time empty from midnight- 3 am; I aim to test my car out once more.
01-17-21 | 02:46 PM
#29
Driver School Candidate
Joined: Jan 2021
Posts: 2
Likes: 1
From: Florida
En route
Just wanted to open discussion.
A co-worker showed me a picture of his speedometer showing a speed of 197. He says he had the speed governor removed or disconnected. Told me it cost him 1K. Also has an exhaust but that was done months ago.
My problem is I just don't believe it. I don't believe our car is capable of that. I wouldn't believe even 179 mph.
He thinks people are stupid. There is no way to safely hit those speeds on our interstate. South Florida has too many cars on the road even at late night hours.
I can't believe the street tires could handle the stress.
Not sure the car could handle the strain.
If he is on the level, maybe the speedometer is wrong.
Your thoughts
A co-worker showed me a picture of his speedometer showing a speed of 197. He says he had the speed governor removed or disconnected. Told me it cost him 1K. Also has an exhaust but that was done months ago.
My problem is I just don't believe it. I don't believe our car is capable of that. I wouldn't believe even 179 mph.
He thinks people are stupid. There is no way to safely hit those speeds on our interstate. South Florida has too many cars on the road even at late night hours.
I can't believe the street tires could handle the stress.
Not sure the car could handle the strain.
If he is on the level, maybe the speedometer is wrong.
Your thoughts
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