SF90 [Official] All-new Ferrari SF90 Stradale

[Abbat]

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[Bridster]

The example of the Bugatti Chiron was the first I had in mind because in Automotive industry is the first example of car accelerating harder than braking. It’s enough you check the Car and driver 0-60 mph (2,4 s) that means 1,13g in Avg acceleration and the 160 ft from 70 mph braking distance compared to cars like 911 GT2/GT3 doing 130 ft dead and 1,25-1,30g. But the explanation of the results of Quattroruote is very simple. With new AWD technology and Hybrid system (SF90 can distribute torque to each wheels independently ) a lot of incoming cars will easily accelerate harder than braking up to 100 Km/h (Tesla roadster, Rimac Nevera, etc etc). Acceleration and braking are limited by traction and so by tires grip. And even with a perfect balanced car (50/50 front and rear distribution, longitudinal center of gravity perfectly in the middle of wheelbase ) the grip on the rear (on which normally the 70-80% of the torque is sent) is higher than the grip on the front (on which normally the 70-80% of the power brake is applied) due to the size of the tires. Today supercar has from 55 to 60 % of the weight on the rear axle and the consequently the longitudinal center of gravity moved versus the rear axle with increased load transfer and increasing the grip when under longitudinal acceleration.

You can find easily tuned Porsche 991-992 turbo clocking 0-100Km/h in 2,2 seconds (1,3g) with stock tires

Last but not least. Drag effect is negligible in braking result from 100km/h. You don’t need to flip the coin just simple physic

Using the aero info of a F8 tributo (Cx = 0,32, Sf = 2,04 m^2) and drag resistance formula, the force acting on a SF90 at 100 Km/h is 31 Kg / 303 N while at 50Km/h is 8 kg / 76 N. I will suppose during 100-0 braking to be 15Kg / 147 N in avg (but it is less because proportional to square of speed). The Avg Force to stop a 1821Kg SF90 in 32,8 meters from 100Km/h (using F*S = m*V^2 / 2) is 21423N. If I add 147N of the drag effect the stopping distance (with same formula) became 32,58 m so 0,22 m less (0,67%).

Regards

Car and Driver measure acceleration with 1-ft roll-out, so the actual 0-60 time would be around 2.6s (1.05G). 160ft stop from 60mph would be 1.02G. So granted, that's actually worse (which I didn't know), but then C&D say the distance "continued to improve as brakes and tires warmed up" and also they suggest they did the braking test on a different surface than the acceleration test.

It's true that the difference in sizes of the front and rear tires will play some role and that's where you might get some grip advantage when accelerating. And also it might be that the extremely fine adjustment electric motors are capable of will be better than the slip adjustment of the ABS system. But again, so far that doesn't seem to have played a very big role as there haven't been any cars where the acceleration was faster (except maybe the one with the Bugatti). However, you can look at, for example, the 918, which is very similar to the SF90 in many ways. It also has electric motors both at the front and back and should have the best possible launch. Which it does with true 0-60 of 2.4s for 1.13G. However, it also brakes from 60 in 94ft for 1.28G. Even apart from braking (let's pretend QR also did the braking on a different surface to accelerating), how exactly would the SF90 pull 1.29G when the 918 (still the current fastest car) only managed 1.13G? Yeah, the SF90 is on Cup 2 Rs and the 918 was only on Cup 2s. But really, if the difference with the new tires was actually that big, you would also see RWD cars breaking acceleration records all the time. Which you don't with the GT2RS still being the fastest since 2017.

The Turbo is on prepped surface, so irrelevant.

The difference from drag really is quite small. From your example, it would be only 0.016s and 0.009G difference each way for 0.032s and 0.018G total. So I am not quite sure what the deal is. Either way, from the Carwow video we also got another data point for 0-60, 2.43s. Drag Times got 2.35s. So I am not sure what surface QR tested the car on to get effective 2.1s.

 

[lbonu1967]

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Thanks for video. As I anticipated, Nevera did 0-60mph in 2,08 seconds (with not optimal surface) so 1,31g of accelaration in avg, no way is gonna brake at 1,3g with over 2 tonns of weight

 

[mihc]

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[Abbat]

I can feel through my phone's screen how fast this car is.

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[Jo_Sta7]

Some pretty risky maneuvers in that video.

It’s funny though I’ve encountered so many scenarios in my cars like he did where there were two ppl taking up both lanes and going the same speed preventing passing. I’ve always wondered, are some people just terrified to depress the throttle?

 

[SNB]

I’m sorry, did this person really split lanes in a SF90? What on earth are they on?

 

[J.E]

Do you guys even care for this ol' Italian dinosaur anymore? I thought you're all having a massive wankfest over that Rimac whatchamacallit and worshipping Mate Rimac as your new Electric Messiah.

 

[Mafalda]

I don't like the last video. too many risk

 

[CrunchSlaughtered]

In a normal country for that driving the driver would go to jail and the car would be confiscated and scrapped.

 

[bmwz4coupe]

The driver in this video is a fu#%ing idiot! Not much more to say about that.

 

[CrunchSlaughtered]

Some pretty risky maneuvers in that video.

It’s funny though I’ve encountered so many scenarios in my cars like he did where there were two ppl taking up both lanes and going the same speed preventing passing. I’ve always wondered, are some people just terrified to depress the throttle?

In city driving there is no fast lane. If both cars are driving at the limit of the allowed speed is normal to keep driving together for quite a long distance.

 

[slicknick]

I can feel through my phone's screen how fast this car is.

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Looks like an acid trip...Bet it feels that way too

 

[WBarnes]

Some pretty risky maneuvers in that video.

It’s funny though I’ve encountered so many scenarios in my cars like he did where there were two ppl taking up both lanes and going the same speed preventing passing. I’ve always wondered, are some people just terrified to depress the throttle?

Lorries are the worst culprit, they can be engaged in several hour long battles to see whose 56mph speed restrictor is set slightly higher.

 

[Jo_Sta7]

Lorries are the worst culprit, they can be engaged in several hour long battles to see whose 56mph speed restrictor is set slightly higher.

And the entire time you’re stuck behind they are kicking up small stones to pit your windshield.

 

[slicknick]

green sample for the VIP unveiling in Dubai
https://www.instagram.com/reel/CP2qOFuB15v/?utm_medium=copy_link

 

[Levi68]

I can feel through my phone's screen how fast this car is.

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nice vid, nice driver. i prefer 1 driver as this one, that is concentrated at the risks he is taking rather than 99 drivers distracted by their phones and unaware of the risks they are creating.

 

[Bridster]

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More data putting the QR test in question. This guy achieves 2.57s 0-100km/h. So we've now had 3 other 0-100 measurements:

Drag Times: 2.45s
Carwow: 2.53s
Daniel Abt: 2.57s

Yet QR somehow gets 2.19s ...

 

[slicknick]

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More data putting the QR test in question. This guy achieves 2.57s 0-100km/h. So we've now had 3 other 0-100 measurements:

Drag Times: 2.45s
Carwow: 2.53s
Daniel Abt: 2.57s

Yet QR somehow gets 2.19s ...

Would be curious to know the weather, road &the tire conditions they each did their tests (including QR)

 

[Deleted member 1071]

I can feel through my phone's screen how fast this car is.

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Sorry, but the person behind the wheel should not be. In any sort of vehicle.