Biggest spin wheels for G35?

[rh71]

as long as you like it...

as long as you don't care about people pointing and laughing...

 

[herm0016]

woot. increase the rotating mass and add damping effects.. way to go making your car drive like a pos!

 

[sdifox]

Originally posted by: herm0016
woot. increase the rotating mass and add damping effects.. way to go making your car drive like a pos!

Enough with the rotational mass. Mass of your wheel is insignificant unless you are driving a tincan with monster truck wheels.

 

[hiromizu]

Originally posted by: herm0016
woot. increase the rotating mass and add damping effects.. way to go making your car drive like a pos!

what are you talking about? I drive slow wit da flow wit flava.

 

[mwmorph]

Originally posted by: sdifox

Originally posted by: herm0016
woot. increase the rotating mass and add damping effects.. way to go making your car drive like a pos!

Enough with the rotational mass. Mass of your wheel is insignificant unless you are driving a tincan with monster truck wheels.

Mass of your wheel is a massive deal. As a rule of thumb, every 100 pounds of sprung weight drops your 1/4 mile times by 0.1s. Every 100 pounds of unsprung, rotational weight will add about 0.5-0.6s to your 1/4 mile time.

It has always, always been well known that rotational weight affect ride, handling and acceleration usually 5x more than sprung wight. That is why Nascar runs 15" wheels, F1 runs 14" and Prototype racers in lemans run 15" if they are open cockpit(16" as a punishment for being closed cockpit and thus more aerodynamic). This is also why tuners usually swap in a smaller set of wheels to dyno their vehicles.

 

[sdifox]

Originally posted by: mwmorph

Originally posted by: sdifox

Originally posted by: herm0016
woot. increase the rotating mass and add damping effects.. way to go making your car drive like a pos!

Enough with the rotational mass. Mass of your wheel is insignificant unless you are driving a tincan with monster truck wheels.

Mass of your wheel is a massive deal. As a rule of thumb, every 100 pounds of sprung weight drops your 1/4 mile times by 0.1s. Every 100 pounds of unsprung, rotational weight will add about 0.5-0.6s to your 1/4 mile time.

It has always, always been well known that rotational weight affect ride, handling and acceleration usually 5x more than sprung wight. That is why Nascar runs 15" wheels, F1 runs 14" and Prototype racers in lemans run 15" if they are open cockpit(16" as a punishment for being closed cockpit and thus more aerodynamic). This is also why tuners usually swap in a smaller set of wheels to dyno their vehicles.

Track <> real life. How many hundreds of pounds of wheels do you have on your car? Say you shave 50lb by switching to a lighter wheel, will that 50lb make a difference in theory, sure. Will it be noticeable by humans? no. Aspect ratio + contact patch size of the tire is more relevant than the mass of the wheel.


Are you seriously saying the rotational mass of your wheels matter more than the total mass of the car???

 

[Knavish]

Originally posted by: sdifox
Are you seriously saying the rotational mass of your wheels matter more than the total mass of the car???

The mass of your wheels doesn't matter *more* than the total mass of the car, it's just the *WORST* place to add mass from an acceleration and handling perspective.

 

[sdifox]

Originally posted by: Knavish

Originally posted by: sdifox
Are you seriously saying the rotational mass of your wheels matter more than the total mass of the car???

The mass of your wheels doesn't matter *more* than the total mass of the car, it's just the *WORST* place to add mass from an acceleration and handling perspective.

Was just responding to mwmorph's statement. Obviously you would like to keep the wheel mass low, but it should probably be the last place you should look to improve your car.

Priginally posted by: mwmorph
It has always, always been well known that rotational weight affect ride, handling and acceleration usually 5x more than sprung wight.

 

[alkemyst]

DONK IT!

 

[mwmorph]

Originally posted by: sdifox

Originally posted by: mwmorph

Originally posted by: sdifox

Originally posted by: herm0016
woot. increase the rotating mass and add damping effects.. way to go making your car drive like a pos!

Enough with the rotational mass. Mass of your wheel is insignificant unless you are driving a tincan with monster truck wheels.

Mass of your wheel is a massive deal. As a rule of thumb, every 100 pounds of sprung weight drops your 1/4 mile times by 0.1s. Every 100 pounds of unsprung, rotational weight will add about 0.5-0.6s to your 1/4 mile time.

It has always, always been well known that rotational weight affect ride, handling and acceleration usually 5x more than sprung wight. That is why Nascar runs 15" wheels, F1 runs 14" and Prototype racers in lemans run 15" if they are open cockpit(16" as a punishment for being closed cockpit and thus more aerodynamic). This is also why tuners usually swap in a smaller set of wheels to dyno their vehicles.

Track <> real life. How many hundreds of pounds of wheels do you have on your car? Say you shave 50lb by switching to a lighter wheel, will that 50lb make a difference in theory, sure. Will it be noticeable by humans? no. Aspect ratio + contact patch size of the tire is more relevant than the mass of the wheel.


Are you seriously saying the rotational mass of your wheels matter more than the total mass of the car???

Absolutely. Every 1 pound of rotational mass equals 5 pounds of sprung mass when impacting every conceivable aspect of a car.

For example, 20lb rotational mass is 2% reduction in fuel economy.

Spinners are also very, very heavy wheels. It's essentially 1.5 wheels in one because of the additional front design and spinning mechanism. On a conservative estimate, you're adding at least 60lbs, probably more like 80lbs for 4 corners.

That 60-80 lbs will affect acceleration, turn in, ride, NVH, braking, fuel economy, etc as if you'd added 300-400lbs to your car in passengers.

Even just looking at fuel economy, thats 6-8%... auto companies kill to add 6-8% better fuel economy, the 7 speed auto trans from Mercedes only added about 4-5% economy from the 5 speed used before. Direct injection only adds about 5-6%. 6-8% is a significant drop over 100k miles.

Is rotational mass the be all end all of weight loss? No. Is it the absolute most important part of weight loss? Yes. Pound for pound, it is always better to lose rotational weight over normal sprung weight.

Look at it this way, a Carbon Fiber hood will save about 60lbs on a large car. That's weight that can easily be subtracted by replacing a single wheel(12lbs).

Also, remember, cars are weighed on the wheels. Wheel and tire weight is included in the total weight of the car.