200 mph?
03-12-17, 09:32 AM
#1
200 mph?
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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Vitveet (01-31-20)
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03-12-17, 06:01 PM
#5
That's what I am thinking as well.
I don't think ~450 bhp is anywhere near enough to get that heavy car up to that kind of speed. If it was done on the street, I'd assume the car would have to have considerably more power to reach those speeds at short distance.
EDIT: I thought I was on the RC-F forum when I posted the above, the regular RC absolutely no chance in hell to hit 200.
I've pushed my stock IS-F on an enclosed track to well over 100mph but I know that car doesn't have the juice to touch anything even close to 200. It would have to have double the power, especially on the streets where you don't have miles of smooth straightaway.
I don't think ~450 bhp is anywhere near enough to get that heavy car up to that kind of speed. If it was done on the street, I'd assume the car would have to have considerably more power to reach those speeds at short distance.
EDIT: I thought I was on the RC-F forum when I posted the above, the regular RC absolutely no chance in hell to hit 200.
I've pushed my stock IS-F on an enclosed track to well over 100mph but I know that car doesn't have the juice to touch anything even close to 200. It would have to have double the power, especially on the streets where you don't have miles of smooth straightaway.
Last edited by 97-SC300; 03-12-17 at 06:06 PM.
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03-13-17, 01:42 PM
#8
If he really tried to do that, I question his sanity.
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finny76 (03-15-17)
03-15-17, 01:13 PM
#10
Lead Lap
The RC F would have a hard time reaching 197 mph. But I know that the RC F can hit 179 with ease if the governor is removed. I do not believe a 350 could do it unless it had forced induction or n2o. It's not going to do it with bolt-ons unless it can shed like 1000+ pounds.
It's also very possible to reach over 200 mph on public roads. You can find many examples on Youtube.
Edit: One of my old favorite videos, and this is over 10 years old:
Oh, and incase you are curious. Here's the specs on a 2004 Gallardo:
Horsepower: 493 hp
MPG: Up to 10 city / 17 highway
Curb weight: 3,153 lbs
Engine: 5.0 L V10
Torque: 375 lb-ft
It's also very possible to reach over 200 mph on public roads. You can find many examples on Youtube.
Edit: One of my old favorite videos, and this is over 10 years old:
Oh, and incase you are curious. Here's the specs on a 2004 Gallardo:
Horsepower: 493 hp
MPG: Up to 10 city / 17 highway
Curb weight: 3,153 lbs
Engine: 5.0 L V10
Torque: 375 lb-ft
Last edited by Davew77; 03-17-17 at 06:42 PM.
03-16-17, 12:54 PM
#11
Lead Lap
http://www.automobile-catalog.com/ca...do_e-gear.html
http://www.lexus.com/models/RCF/specifications
I will bet it will reach 185-190 though. It's not going to take much more power to make it to 200. A 150 shot of n2o would certainly do it, or any kind of forced induction.
BTW, double the speed is roughly 4 times the power. Using your math, that 493 hp 3,150 lbs. Lambo which could barely hit 200 mph would only need 493hp / 8 = 61.6 hp to reach 100 mph... right... But you can believe what you want. I don't bench race...
Last edited by Davew77; 03-17-17 at 06:42 PM.
03-16-17, 01:08 PM
#12
Lead Lap
Stock RC F at 174 mph (Only has an axle back exhaust, virtually no gains). It has taller tires on it which is going to actually hurt the top end. It was still pulling at 174 mph. Note: This is GPS verified speed. The speedometer reading at 174 mph will actually be closer to 178-179 with the stock tires.
03-16-17, 02:36 PM
#13
Pole Position
I have personally had my RC F at 175 mph many times. It still has power to pull. It will easily hit 179 mph. I don't think it will hit 200 mph in stock form and I never said it would. So I don't know what you are referring to with the aerodynamics. But since you want to talk about aerodynamics. The drag coefficient for the RC F is .33 and for the 2004 Gallardo it's .36. i.e. the RC F is more aerodynamic. So the real limiting factor for the RC F is only the weight.
http://www.automobile-catalog.com/ca...do_e-gear.html
http://www.lexus.com/models/RCF/specifications
I will bet it will reach 185-190 though. It's not going to take much more power to make it to 200. A 150 shot of no2 would certainly do it, or any kind of forced induction.
BTW, double the speed is roughly 4 times the power. Using your math, that 493 hp 3,150 lbs. Lambo which could barely hit 200 mph would only need 493hp / 8 = 61.6 hp to reach 100 mph... right... But you can believe what you want. I don't bench race...
http://www.automobile-catalog.com/ca...do_e-gear.html
http://www.lexus.com/models/RCF/specifications
I will bet it will reach 185-190 though. It's not going to take much more power to make it to 200. A 150 shot of no2 would certainly do it, or any kind of forced induction.
BTW, double the speed is roughly 4 times the power. Using your math, that 493 hp 3,150 lbs. Lambo which could barely hit 200 mph would only need 493hp / 8 = 61.6 hp to reach 100 mph... right... But you can believe what you want. I don't bench race...
I think 200 mph is achievable in stock form WITH A TAIL WIND!!! LOL. Seriously I think the stock RCF can get close, like 190mph or so.
03-16-17, 02:46 PM
#14
Lead Lap
LOL, Where is my old VW BUG car from way back?..... I don't remember ever hitting 100mph😕😞. I guess I was too scared the engine will come apart and I'll have to pick up the pieces. LOL.
I think 200 mph is achievable in stock form WITH A TAIL WIND!!! LOL. Seriously I think the stock RCF can get close, like 190mph or so.
I think 200 mph is achievable in stock form WITH A TAIL WIND!!! LOL. Seriously I think the stock RCF can get close, like 190mph or so.
03-16-17, 03:00 PM
#15
Lead Lap
BTW, double the speed is roughly 4 times the power
That's nice, as the saying goes you're entitled to your opinion, except this not "what flavor ice cream do you like?", it's physics..
It's closer to the speed change cubed (since the mechanical losses and rolling resistance do not increase as rapidly). The correct answer (the one I just gave) is available in thousands of places. It was really useful for the Wright brothers...
A lower CD is of course an advantage, but never resolves the question.
The CD is, if you bother to read what I posted, is one of the two aero factors, and the Lexus is like a foot taller?
With the same power, a toaster with a CD of 2.00 will reach a higher top speed that a rocket 6 feet in diameter with a CD of .20.
Guess what running over a nail at 175 does?
That's nice, as the saying goes you're entitled to your opinion, except this not "what flavor ice cream do you like?", it's physics..
It's closer to the speed change cubed (since the mechanical losses and rolling resistance do not increase as rapidly). The correct answer (the one I just gave) is available in thousands of places. It was really useful for the Wright brothers...
A lower CD is of course an advantage, but never resolves the question.
The CD is, if you bother to read what I posted, is one of the two aero factors, and the Lexus is like a foot taller?
With the same power, a toaster with a CD of 2.00 will reach a higher top speed that a rocket 6 feet in diameter with a CD of .20.
Guess what running over a nail at 175 does?
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...
Last edited by Davew77; 03-16-17 at 06:11 PM.