Image of Bugatti Chiron Super Sport 300+

Bugatti Chiron Super Sport 300+ specs

Car type Coupe
Curb weight 1978 kg (4361 lbs)
Power / weight 820 ps (809 bhp) / t
Introduced 2020
Origin country France
Views 715
Submitted by lafars

Powertrain

Engine type quad-turbo W16
Displacement 8.0 l (488 ci)
Power 1622 ps (1600 bhp / 1193 kw) @ 7000 rpm
Power / liter 203 ps (200 hp)
Transmission 7-speed DCT
Layout middle engine, all wheel drive
User avatar

User avatar

HighGear  2w ago

Likely 1180 lb-ft, like the standard Chiron.


User avatar

HighGear  2w ago

Source: https://www.topgear.com/car-news/supercars/bugatti-chiron-super-sport-300-production-300mph-car

The power output is 1,578 hp (1,600 PS).
Price: 4.2 Million pounds (5.18 Million US dollars)
Top Speed: 304.77mph*
*https://www.topgear.com/car-news/bugatti-has-broken-300mph-barrier?fpn=1


User avatar

manone  2w ago

"Why can't it reach 490 kph with 1600 ps? What are those "engineering peeps" that are so convinced it can't? Have they studied the shape of the car?"

Ok, let's do few computations for Veyron SS. The formula relating power to CdA, speed v and air density rho is:

P = CdA * v^3 * rho/2.

Knowing V=431km/h=119.7 m/s, P=1200bhp=895kw and rho@15C=1.225 kg/m^3,
we get a CdA of 0.85.

Therefore, for the Veyron SS to reach 490km/h you need 1307kw=1753bhp for
overcoming the drag alone from 431kmh to 490kmh. Then you have to add:

Rolling friction term, which linear with speed, and dynamic rolling resistance term, quadratic with speed.

Back to the Chiron SS: the A factor of Cd*A is seemingly not less than the
Veyron SS's. How much they could have decreased the Cd from the Veyron SS to the Chiron SS, provided the extra front venting surfaces the latter has?

 

User avatar

lafars  2w ago

can you calculate if the SSC Tuatara can reach 300mph and with how much power left? Cd=0.279, power is 1750hp


User avatar

FastestLaps  2w ago

Veyron and Chiron have different shapes, it would be natural to assume that Chiron is more slippery than Veyron, as clearly the goal of Bugatti was to make a faster car. The Chiron SS is even more slippery still - Bugatti say 40%, that is probably misleading, but it has to be somewhat significant amount.

Now add to that fact that Chiron SS has 1622 PS and possibly less transmission losses than Veyron and you must conclude that 490 @ 1600+ PS seems possible and there is no need for John Hennessey conspiracy theories.

The rolling friction I am not very knowledgeable about, but I believe the difference is not too significant. The tyres are probably just as rock hard at 490 as they are at 430.


User avatar

SpeedKing  2w ago @FastestLaps

Where does it say that the Chiron 300+ has 40% improved aero over the current Chiron?


User avatar

FastestLaps  2w ago @SpeedKing

In video interview lafars posted below.

If you look at streamliners built for land speed records or top speed competition on salt flats, they are all elongated with long overhang fairing at the back. Streamlined motos in particular can be surprisingly fast with surprisingly little power. The long tail is significant change for Chiron SS.

Fun fact: did you know it is possible to reach 144+ kph with less than 2 horsepower? https://en.wikipedia.org/wiki/List_of_cycling_records#History_of_unpaced_records

Aero drag is everything.


User avatar

SpeedKing  2w ago @FastestLaps

No what the Bugatti engineer said was that there was a 40% decrease in size of the rear tear off area not that there's a 40% overall decrease in drag. A 40% decrease in drag would result in a drag coefficient of 0.21 which is a pipe dream.


User avatar

SpeedKing  2w ago @FastestLaps

Aero is one aspect. There's complexity to going over 300 mph without doing a Mark Webber.

"Most speculators have settled on around 1,800bhp being the predicted amount of power needed to push a car to 300mph, but power isn’t as big a problem as you would think – the real issue is cooling things down and the consequences of doing that.

The established method for cooling down the excessive heat an engine produces is by channelling the vast quantity of air that rushes past the vehicle as it moves over the hot parts to strip away the excess heat. It's a simple and elegant solution; the faster you travel the more you need to cool, and the faster you go the more air you are provided with. It’s perfect - except for the drag that’s produced.

As you channel that air through intakes and scoops, those gaps and holes reduce the aerodynamic efficiency of the car and cause drag. And the faster you are travelling, the more that drag slows you down and wastes more of the power produced by the engine.

Of that 1,800hp estimate, almost 1,500hp of it will be used just to overcome the drag of the vehicle.

You’re now faced with solving one of the conundrums that has so far prevented engineers from building a car that can reach 300mph. How do you add more power to an engine which then needs to be further cooled, but cooling then slows down the car by increasing its drag".


User avatar

manone  2w ago @FastestLaps

"possibly less transmission losses than Veyron"

this i would say it is just the same.


User avatar

dr. cosimo  2w ago @SpeedKing

it's simple with vw group, you download a different map with higher boost and tell the public it hardly has an extra 100 hp and still manages to hit a new speed record.

post a video, limit production and have the idiots put down a deposit.

another aventador story

vw is a complete cluster fcuk disaster, when it comes to the cars history and heritage


User avatar

FastestLaps  2w ago @dr. cosimo

Messing around with ECU is not unique to one specific manufacturer. Oldest trick in the book.


User avatar

SpeedKing  2w ago @dr. cosimo

If VW wait till 2024 to replace the Aventador that would be fcuking stupid. Domenicali wants the V12 to continue but the Germans want V8 hybrid turbo's so no prizes for guessing who's gonna come out on top pfft idiots!


User avatar

dr. cosimo  2w ago @FastestLaps

there's a lot more that hasn't been disclosed yet, the ecu part is just tip of the iceberg

"There are other differences between the 300+ and the actual record-setting car, which was shown on the Bugatti tour complete with grime and bug splatter from the track. The road-legal Super Sport won't have the full roll cage that was fitted to the car Andy Wallace drove at Volkswagen Group's vast Ehra-Lessien test track in Germany, and it will also come with the passenger seat that was taken out in the speed-run Chiron to accommodate computer and timing equipment. It will also have a standard ride height—the 300-mph car sat lower—and Bugatti admits it will have a speed limiter, although the company hasn't said what that will be set to yet. It seems likely that the determining factor will be the maximum speed that the car's Michelin tires can digest for anything other than very short periods. Although not confirmed yet, we also presume the 300+ will have a working air brake, something that the record-setting car didn't use."


User avatar

manone  2w ago @dr. cosimo

"it's simple with vw group, you download a different map with higher boost and tell the public it hardly has an extra 100 hp and still manages to hit a new speed record."

my guess is that they have left some engine parameter free to self-adjust in order to break 300mph. Wallace said that they have made several tests up to 450km/h stable, so they probably got a pretty accurate figure about the power needed for 300mph, but in the video i saw it looks like the speedometer is going to threshold at about 470, but then reaches 490.


User avatar

lafars  2w ago

very informative video regarding this car:
https://www.youtube.com/watch?v=DFlUYWfwOUg


User avatar

FastestLaps  2w ago

You know what is the saddest part - we still don't have proper data for the original Chiron :D

Bugatti are basically pulling a Christian von Koenigsegg.

 

User avatar

lafars  2w ago

you can at least add top speed to the stats: 304,77mph


User avatar

SpeedKing  2w ago @lafars

The pre-production 304 mph run had mods and highly likely more than the 1578 bhp claimed by Bugatti so until the 300+ is independently tested, when released, i wouldn't be adding the 304.77 mph stat :)


User avatar

SpeedKing  2w ago @lafars

The general consensus by engineering physics peeps is that for Bugatti to reach 304.77 mph it would need a minimum of 1800 bhp so if Bugatti/VW had any integrity it would be truthful rather than making bullshit claims that it has 1578 bhp. Once again it suggests that you can't believe any turbo hp figures from car manufacturers pfft


User avatar

FastestLaps  2w ago @SpeedKing

Why can't it reach 490 kph with 1600 ps? What are those "engineering peeps" that are so convinced it can't? Have they studied the shape of the car?


User avatar

SpeedKing  2w ago @FastestLaps

The aero changes aren't as amazing as you may think because a shitload of air, more than the current model gets, needs to be channelled to the cooling system to prevent the engine from overheating and this effectively increases drag which to a significant extent offsets the improvements they've made to the aero.

In addition to that the acceleration difference from 300 to 400 km/h is huge ie. approx 11 secs for the prototype vs 16 secs for the current Chiron. It takes more than 100 hp and aero to be that much quicker.

Lastly coz Hennessey said so and he would know don't you think? lol


User avatar

lafars  2w ago @SpeedKing

while i can't say for certian how much 100hp and longtail would add up to there is one thing that was mentioned in the supercarblondie video:

the longtail gives a 40% reduction in drag over the standard Chiron


User avatar

manone  2w ago @lafars

if 40% is over the total car's drag, then it would need much less than 1600bhp to reach 490km/h.


User avatar

SpeedKing  2w ago @lafars

The current Chiron drag coefficient is 0.38 in EB (standard) mode, 0.40 in Handling, 0.35 in Top Speed and 0.59 when the air brake is active. So a 40% reduction equates to 0.21 in top speed mode which is unrealistic given it still needs huge amounts of air being diverted to the cooling ducts to stop the engine from overheating and shutting down. Anyway the speed is not recognised as a record given it's not a production car and it was only a single pass.


User avatar

SpeedKing  2w ago @lafars

"the longtail gives a 40% reduction in drag over the standard Chiron" they didn't say that in the video. What the Bugatti engineer said was that there was a 40% decrease in size of the rear tear off area which doesn't equate to 40% less downforce. Details are important :)


User avatar

lafars  2w ago @SpeedKing

can you calculate the drag area using an estimated tear size?


User avatar

SpeedKing  2w ago @lafars

No, only Bugatti have that information coz you'd need wind tunnel verification to unequivocally determine the benefit. My guess would be approx 10%??


User avatar

lafars  2w ago

maybe i should've added Super Sport 300+ to the model name, but then again @fastestlaps can reupload with proper changes