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-   -   2015 Nissan GT-R 0-60mph in 2.0 seconds (https://www.revscene.net/forums/687669-2015-nissan-gt-r-0-60mph-2-0-seconds.html)

Harvey Specter 08-28-2013 03:46 AM
I've never been a fan of the styling of the GTR but it is one amazing car.

Splinter 08-28-2013 09:58 AM
Quote:
Originally Posted by westopher (Post 8308984)
I just don't get how its possible. Why do cars of a similar weight all need 1000hp to do it? I don't understand how gearing, traction, and aero can mathematically make it happen. 570hp moving a 3800 lb car to 60mph in 2 seconds just doesn't seem possible, even with all the robot driving double clutch transmission tech in the world.
e = 1/2mV^2
e = 1/2(3800lb)*(60mph)^2
e = 620kJ
620kJ / 2 seconds = 415hp

Average horsepower to the ground of 415 over 2 seconds. Doable.

Science! :nyan:

tofu1413 08-28-2013 09:59 AM
Quote:
Originally Posted by Marshall Placid (Post 8309034)
Not an expert myself, but I think you are referring to the AWD's torque differential that transfers power between the front and rear and vice versa.

Making AWD vehicles fun to drive (in a sense anyway) in a straight line AND when cornering.
Power transfer is quick!

Timpo 08-28-2013 01:04 PM
Quote:
Originally Posted by Splinter (Post 8309151)
e = 1/2mV^2
e = 1/2(3800lb)*(60mph)^2
e = 620kJ
620kJ / 2 seconds = 415hp

Average horsepower to the ground of 415 over 2 seconds. Doable.

Science! :nyan:
true, if you ever see a slow camera on how high performance cars launch, there actually is a lot more wheel spin and power loss than you think.
sophisticated launch control will hopefully fix this problem.
Mizuno san also said how efficient GT-R's drive trains are...thus, less power loss.

on a side note...I'm not a physics guy and didn't understand your formula at all

westopher 08-28-2013 01:10 PM
Quote:
Originally Posted by Splinter (Post 8309151)
e = 1/2mV^2
e = 1/2(3800lb)*(60mph)^2
e = 620kJ
620kJ / 2 seconds = 415hp

Average horsepower to the ground of 415 over 2 seconds. Doable.

Science! :nyan:
I'm a chef, so I have the math skills of a 4 year old, so I'm just gonna nod my head and thank you, assuming it makes sense.

lowside67 08-28-2013 02:01 PM
I don't really understand why this is a thread. This isn't an announcement, a review, or anything other than some random person speculating/dreaming that the 2015 GTR will achieve this. Who the fuck is Viknesh Vijayenthiran?

I realize this is a Timpo thread but this thread has less content than even the average fucking Timpo thread.

Might as well have started this thread:

"2018 Porsche 992 to have 5 wheels"

Timpo 08-28-2013 02:16 PM
Quote:
Originally Posted by lowside67 (Post 8309301)
Who the fuck is Viknesh Vijayenthiran?
Our Writers | High Gear Media

lowside67 08-28-2013 02:20 PM
Yeah I can Google too. He also comes up for Fox News... super trustworthy! I guess a better question is who is High Gear Media and what does Viknesh know that the rest of the world doesn't about the new GTR?

Marshall Placid 08-28-2013 10:50 PM
Quote:
Originally Posted by tofu1413 (Post 8309152)
Power transfer is quick!
I double checked some facts about Nissan's AWD system and how the heck it could be faster than cars with the same HP that costs twice as much:

Nissan GT-R's Secret - ATTESA E-TS AWD System Explained

Interesting read.

AWD, at least during the initial short-distance drag racing, for Nissan, makes it quicker than many, many cars.

Quote:
Originally Posted by Splinter (Post 8309151)
e = 1/2mV^2
e = 1/2(3800lb)*(60mph)^2
e = 620kJ
620kJ / 2 seconds = 415hp

Average horsepower to the ground of 415 over 2 seconds. Doable.

Science! :nyan:
Interesting take.

Just want to add the following:

Only 415hp required?

Did you factor in the power loss from crank to wheels?

And... head-wind speed?

I think it is around 15% to 25% for AWD.

So, 415hp, assuming 25% power loss is:

553hp.

The current GT-R, 2012 model, produces 542hp (crank).

So, the newest rendition proposed by the article's writer should be around 553hp and should be doable, with a little tweak here and there.

dared3vil0 08-28-2013 10:57 PM
Quote:
Originally Posted by Splinter (Post 8309151)
e = 1/2mV^2
e = 1/2(3800lb)*(60mph)^2
e = 620kJ
620kJ / 2 seconds = 415hp

Average horsepower to the ground of 415 over 2 seconds. Doable.

Science! :nyan:
Little thing called traction/ Not always being at your exact perfect powerband spot/ time it takes to shift etc etc etc.

Splinter 08-29-2013 08:09 AM
Quote:
Originally Posted by dared3vil0 (Post 8309616)
Little thing called traction/ Not always being at your exact perfect powerband spot/ time it takes to shift etc etc etc.
That's why I specified to the ground, and average :)

NKC ONE 08-29-2013 08:15 AM
Very interesting. There's already a lot of respect for this car and if the GTR can actually hit 60 in 2 then wow, it'll be on a whole new level. I really don't care how they do it, as long as they claim they would then I'm sure they will. Now let's wait and see.

Splinter 08-29-2013 08:18 AM
All that being said, I really, really doubt it will. As others have posted, there is almost no room for losses with those numbers.

Timpo 08-29-2013 09:03 AM
Quote:
Originally Posted by Marshall Placid (Post 8309605)
I double checked some facts about Nissan's AWD system and how the heck it could be faster than cars with the same HP that costs twice as much:

Nissan GT-R's Secret - ATTESA E-TS AWD System Explained

Interesting read.

AWD, at least during the initial short-distance drag racing, for Nissan, makes it quicker than many, many cars.



Interesting take.

Just want to add the following:

Only 415hp required?

Did you factor in the power loss from crank to wheels?

And... head-wind speed?

I think it is around 15% to 25% for AWD.

So, 415hp, assuming 25% power loss is:

553hp.

The current GT-R, 2012 model, produces 542hp (crank).

So, the newest rendition proposed by the article's writer should be around 553hp and should be doable, with a little tweak here and there.
No, it's 10% for GT-R...I've seen Mizuno san (GT-R chief engineer) saying the same thing as well

What % Drivetrain Loss? - R35 GT-R - GT-R Life

shenmecar 08-29-2013 09:07 AM
Quote:
Originally Posted by Splinter (Post 8309151)
e = 1/2mV^2
e = 1/2(3800lb)*(60mph)^2
e = 620kJ
620kJ / 2 seconds = 415hp

Average horsepower to the ground of 415 over 2 seconds. Doable.

Science! :nyan:
my friend, you are simply calculating the kinetic energy of a 3800 lbs object traveling at a constant 60 mph.

Splinter 08-29-2013 09:17 AM
Quote:
Originally Posted by shenmecar (Post 8309778)
my friend, you are simply calculating the kinetic energy of a 3800 lbs object traveling at a constant 60 mph.
Yes, yes I am.

And energy is conserved, so the energy required to accelerate an object to that constant speed is equal to the kinetic energy at that speed.

shenmecar 08-29-2013 09:18 AM
Quote:
Originally Posted by Splinter (Post 8309783)
Yes, yes I am.

And energy is conserved, so the energy required to accelerate an object to that constant speed is equal to the kinetic energy at that speed.
in a physics utopia on a frictionless road and in vacuum (no air resistance).

Splinter 08-29-2013 09:23 AM
Quote:
Originally Posted by shenmecar (Post 8309786)
in a physics utopia on a frictionless road and in vacuum (no air resistance).
On a frictionless road you wouldn't move. So. No, not that.

Splinter 08-29-2013 09:29 AM
Air resistance on a GTR at 60mph:
D = 1/2pV^2*C*A
D = 1/2 * (1.204kg/m^3) * (60mph)^2 * .32 * 6.08ft^2
D = 17.5 pounds

Negligible.

shenmecar 08-29-2013 09:44 AM
Quote:
Originally Posted by Splinter (Post 8309789)
On a frictionless road you wouldn't move. So. No, not that.
notice I didn't use the term "car". I used the term "object". How it started to move to a constant velocity on a frictionless surface is beyond me. But somehow it did, and your formula is calculating the KE of that object.

I'm not going to go any further into this kinematics debate. This is about the GTR after all. My only point is that you are neglecting a lot of variables (thermodynamics for example) which plays a crucial point. Have you even considered the horsepower wasted in form of heat due to the inefficiency of the engine? For you to say that the GTR has more power than your theoretical 415 hp and claim that it is "doable" for it to achieve 0-60 in 2.0 s is flawed.

Splinter 08-29-2013 09:48 AM
Quote:
Originally Posted by shenmecar (Post 8309804)
(have you even considered the horsepower wasted in form of heat due to the inefficiency of the engine?)
Yes, I have considered that. And so do the manufacturers of cars when they release horsepower numbers. Horsepower numbers don't include waste heat.

You need to stop having this conversation, you look foolish. I was very specific. Horsepower applied to the road, and average horsepower. Yes, you obviously need higher than 415hp peak to hit that time, that's what average means. All I said is that it was physically possible, not that it was likely or has happened.

shenmecar 08-29-2013 09:57 AM
Quote:
Originally Posted by Splinter (Post 8309807)
Yes, I have considered that. And so do the manufacturers of cars when they release horsepower numbers. Horsepower numbers don't include waste heat.

You need to stop having this conversation, you look foolish. I was very specific. Horsepower applied to the road, and average horsepower. Yes, you obviously need higher than 415hp peak to hit that time, that's what average means. All I said is that it was physically possible, not that it was likely or has happened.
Well that just solves everything.

FerrariEnzo 08-29-2013 10:36 AM
so does this mean that we will start seeing this Nismo GTR here once its released driving by mainlanders thinking they are race car drivers who in fact cant drive and drive like shit then goes to MM design to make it look the part???


back on topic,
cant wait til Top Gear does a review and stig ripping it around their track.. will it beat the Pagani Huayra

Timpo 08-30-2013 02:00 AM
As we know Honda engineers announced that NSX will be faster than the GT-R...they probably were aiming for 2.5 seconds or so but now need to aim for 1.9 seconds LOL

snails 08-30-2013 07:23 AM
^ vtec>physics

:troll:


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