FR-S/BRZ vs. Genesis Coupe

[fatoni]

Originally Posted by 82mm 4g63

Can't believe anyones buying this car? Are you really comparing a car to a motorcycle and jumbo jet? Lol feeling ok?

not buying the car. buying the fact that weight doesnt matter.

[spin9k]

On the track and in this forum weight matters a whole lot. But in a DD car where everyday reality plays out, it's doubtful.

On the street - what's a few hundred lbs between cars? We're not talking weapons systems, these DDs are simply to go places in the 'style' we want. The GC "might" we don't really know for example...

• be a nicer car to live in than the FT-86
• have better mid-range torque
• perhaps more comfortable
• quieter on the highway
• more useful room
• look better
• etc....

..or maybe not. I mean the list goes on and the reason one car is bought over another are varied to fit livestyle. The idea of doubting others would ever buy the GC is ludicrous. On a scale of 1-10 it's a more than decent car as is.

[Buggy51]

Originally Posted by fatoni

not buying the car. buying the fact that weight doesnt matter.

Force = Mass*acceleration...

I suppose if you have enough force, mass really doesn't matter?

[spin9k]

Originally Posted by Buggy51

Force = Mass*acceleration...

I suppose if you have enough force, mass really doesn't matter?

It does get progressively more difficult as you approach the speed of light

[fatoni]

Originally Posted by Buggy51

Force = Mass*acceleration...

I suppose if you have enough force, mass really doesn't matter?

not really and even if you do buy that, you could give the exact same value to weight by saying that if its light enough force really doesnt matter so again mass counts

[fatoni]

Originally Posted by spin9k

It does get progressively more difficult as you approach the speed of light

i dont know what you are trying to say with that but i think that the newtonian physics is going to be accurate enough since these cars will probably be closer to 3 m/s than 3x10^8 m/s

[old greg]

Originally Posted by spin9k

It does get progressively more difficult as you approach the speed of light

Originally Posted by fatoni

i dont know what you are trying to say with that but i think that the newtonian physics is going to be accurate enough since these cars will probably be closer to 3 m/s than 3x10^8 m/s

I think what he means is that the laws of physics no longer apply once VTEC kicks in.

[Dark]

Originally Posted by old greg

I think what he means is that the laws of physics no longer apply once VTEC kicks in.

I think laws of physics apply in the case more than force=mass*acceleration. Try to build a 1000hp brick-like car and see its acceleration, and top speed compare to Bugatti Veyron.

[fatoni]

Originally Posted by Dark

I think laws of physics apply in the case more than force=mass*acceleration. Try to build a 1000hp brick-like car and see its acceleration, and top speed compare to Bugatti Veyron.

well id say the xb is a brick like car and it has a cd of .32 while the veyron has a cd of .36 so my guess would be that its faster. also f=ma is a law of physics.

[old greg]

Originally Posted by Dark

I think laws of physics apply in the case more than force=mass*acceleration. Try to build a 1000hp brick-like car and see its acceleration, and top speed compare to Bugatti Veyron.

Net force = mass * acceleration

Net force is the sum of all forces acting on an object, in this case that includes the tractive force being exerted by the tires, the rolling resistance of the tires and the aero drag.

[Dark]

Originally Posted by old greg

Net force = mass * acceleration

Net force is the sum of all forces acting on an object, in this case that includes the tractive force being exerted by the tires, the rolling resistance of the tires and the aero drag.

Right.
Then Acceleration = Net Force/Mass. Less mass and more net force mean faster acceleration.
Previously, someone was saying big cars with more turbo power accelerate faster than lighter car NA car.

[Ryuu0u]

Originally Posted by Dark

Try to build a 1000hp brick-like car and see its acceleration, and top speed compare to Bugatti Veyron.

lol i think there is a xB out there with a twin turbo tundra 5.7 swap someone did for SEMA a while back. Think its making close to 1k hp.

[old greg]

Originally Posted by Dark

Right.
Then Acceleration = Net Force/Mass. Less mass and more net force mean faster acceleration.
Previously, someone was saying big cars with more turbo power accelerate faster than lighter car NA car.

At high speeds they do. If you have a whole lot of force and a whole lot of weight, an increase in aero drag makes less of an impact on acceleration than if you had very little force and very little weight.

At low speeds power divided by weight is king, at high speeds drag plays a greater and greater role. For example Bonneville streamliners tend to be quite heavy and needlessly overbuilt, and that's before you fill the huge coolant tanks (no radiators). Sportbikes have excellent power to weight ratios so they'll accelerate like crazy at low-ish speeds, but a big hp car (with a worse power to weight ratio) will outrun one in a highway race.

[Dark]

Originally Posted by old greg

At high speeds they do. If you have a whole lot of force and a whole lot of weight, an increase in aero drag makes less of an impact on acceleration than if you had very little force and very little weight.

At low speeds power divided by weight is king, at high speeds drag plays a greater and greater role. For example Bonneville streamliners tend to be quite heavy and needlessly overbuilt, and that's before you fill the huge coolant tanks (no radiators). Sportbikes have excellent power to weight ratios so they'll accelerate like crazy at low-ish speeds, but a big hp car (with a worse power to weight ratio) will outrun one in a highway race.

Yes, you're right. Sportbikes will outrun most cars at under 120mph, but cars will start to pick up after that because weight is also the matter. That's the reason why Suzuki and Kawasaki create a big bulky looking Hayabusa and Ninja ZX 13-14R, respectively, to be the motorcycle version of speed demon instead of handsome looking sportbikes. I was just comparing street cars and sportcar which more power and less weight is all the matter.