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Bugatti Chiron hits 304mph #1635414
10/09/2019 11:10
10/09/2019 11:10
Joined: Sep 2008
Posts: 4,474
J
JKD Offline OP
Forum is my job
JKD  Offline OP
Forum is my job
J

Joined: Sep 2008
Posts: 4,474
https://www.motor1.com/news/368343/bugatti-chiron-reaches-304-mph/

Ignoring machines like the Thrust SSC and Bloodhound SSC since they're more like planes, and say you had an endless, flat road - what's the theoretically highest top speed that could be ever achieved with a conventionally shaped car, before physics prevented any more progress? chinny

Re: Bugatti Chiron hits 304mph [Re: JKD] #1635418
10/09/2019 12:25
10/09/2019 12:25
Joined: Feb 2006
Posts: 5,150
Essex
Trappy Offline
Club Member 1712
Trappy  Offline
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Forum is my life

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Posts: 5,150
Essex
More power simply equals more speed, regardless of aerodynamics. I'd suggest the biggest limiting factor is the composition of tyres.

I'm going to dig out the specs of the Chiron on that note actually and run the numbers. I recently did it for the McLaren F1 and have decided the 243.1mph claimed was fabricated. It just makes no sense. It's actually quite a complex story when you look into the five prototypes that were used in different road tests. They were all so different. Officially it only made 221mph due to gearing. Increasing the rpms allowed for 230mph (confirmed by my calculator) but the 243 would need well over 750bhp.

I'll get back on the Chiron in a bit

Re: Bugatti Chiron hits 304mph [Re: JKD] #1635419
10/09/2019 12:57
10/09/2019 12:57
Joined: Feb 2006
Posts: 5,150
Essex
Trappy Offline
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Essex
This Chiron was tuned from 1479bhp to 1579bhp and had some aerodynamic alterations. I reduced CD to 0.34 to 0.36. Also, 7th gear was increased. I changed the ratio from 0.55 to 0.5. Here are the numbers.

Speed (mph) Time (seconds)
10 0.4
20 0.8
30 1.3
40 1.7
50 2.1
60 2.5
70 3.0
80 3.5
90 3.9
100 4.4
110 4.9
120 5.4
130 6.0
140 6.6
150 7.3
160 8.0
170 8.7
180 9.7
190 10.7
200 11.7
210 12.8
220 14.3
230 15.9
240 17.7
250 19.6


1/4 Mile Time: 9.16
1/4 Mile Terminal: 174.9
0-400m Time: 9.13
0-400m Terminal: 174.5
1km Time: 15.68
1km Terminal: 228.6
1/2 Mile Time: 13.72
1/2 Mile Terminal: 216.3
1 Mile Time: 21.27
1 Mile Terminal: 256.5


Top Speed (mph): 300.1
Top Speed (rpm): 6789
Top Speed (gear): 7th

Re: Bugatti Chiron hits 304mph [Re: JKD] #1635426
10/09/2019 19:33
10/09/2019 19:33
Joined: Dec 2005
Posts: 17,172
Staffordshire
Nigel Offline
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Posts: 17,172
Staffordshire
Interesting- the Chiron gets to 100 in about half the time of my Coupe. By the time my Coupe has done a quarter mile at about 110mph, the Chiron has done half a mile and is doing over 210

I therefore calculate that the Chiron is about twice as good as a Coupe.....


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Re: Bugatti Chiron hits 304mph [Re: Nigel] #1635428
10/09/2019 20:24
10/09/2019 20:24
Joined: Oct 2008
Posts: 6,617
In the coupe.
magooagain Offline
Club Member 259
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In the coupe.
Originally Posted by Nigel
Interesting- the Chiron gets to 100 in about half the time of my Coupe. By the time my Coupe has done a quarter mile at about 110mph, the Chiron has done half a mile and is doing over 210

I therefore calculate that the Chiron is about twice as good as a Coupe.....









Then you're coupe is a bargin Nigel. How does £750,000 sound as an offer? You may have to wait till I get paid next Friday mind.



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Re: Bugatti Chiron hits 304mph [Re: magooagain] #1635436
11/09/2019 06:37
11/09/2019 06:37
Joined: Dec 2005
Posts: 17,172
Staffordshire
Nigel Offline
Club Member 123
Nigel  Offline
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Joined: Dec 2005
Posts: 17,172
Staffordshire
Originally Posted by magooagain
Then you're coupe is a bargin Nigel. How does £750,000 sound as an offer? You may have to wait till I get paid next Friday mind.


Hmm - bit of a cheeky offer - you’ll need to let me think about it....


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