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Wheel weight

 
Old 01-14-2019, 06:12 PM
  #41  
Darion
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I wonder who will offer the first Forged Composite wheels? Press it in mold, heat it and ya have a part. Read that Lamborghini is look at making connecting rods this way, gatta be damn durable.

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Old 03-15-2019, 12:40 PM
  #42  
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Default Get non runflat tires and save 30 lbs unsprung weight

Unsprung weight has a factor of 3 times sprung weight.
so losing 22 lbs unsprung weight from all tires means losing 66 lbs sprung weight.
for every 100 lbs unsprung weight you lose, youíre faster in 0-60 mph by .1 seconds

thereís no point getting runflat tires because although they get you to a tire shop faster, youíll be there longer waiting for a new runflat tire.

Last edited by ptran00; 03-15-2019 at 12:49 PM.
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Old 03-15-2019, 12:45 PM
  #43  
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Originally Posted by ptran00 View Post
Unsprung weight has a factor of 3 times sprung weight.
so losing 30lbs unsprung weight from all tires means losing 60 lbs sprung weights.
for every 100 lbs unsprung weight you lose, youíre faster in 0-60 mph by .1 seconds
Cool thanks for that info, heard some of those before.

But do you mean 2 times and not 3 times?

How about trap speed, whenyou gain .1 sec do you gain 1mph or .5mph in the trap speed? for 1/4 mile.

Is 1mph gain in trap speed equal 10 hp? or what equates 1mph gain.
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Old 03-15-2019, 12:51 PM
  #44  
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3 times.

losing 24 lbs unsprung weight from all tires means losing 72 lbs sprung weight.

Non runflat rear tires are 7 lbs lighter and front are 5 lbs lighter

Last edited by ptran00; 03-15-2019 at 12:53 PM.
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Old 03-15-2019, 03:02 PM
  #45  
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Originally Posted by ptran00 View Post
3 times.

losing 24 lbs unsprung weight from all tires means losing 72 lbs sprung weight.

Non runflat rear tires are 7 lbs lighter and front are 5 lbs lighter
lol, I wish.

It's not even a static conversion, but a good rule of thumb is 2:1 for tires and 1.6:1 for wheels
http://hpwizard.com/rotational-inertia.html

Otherwise, 20lbs for gyrodiscs, 24lbs for forged 18" wheels and 20lbs for tires and I'm at the equivalent of nearly 200lbs of static weight reduction.
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Old 03-15-2019, 03:06 PM
  #46  
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A pound of weight reduction in the tire has more benefit than the wheel because itís the outer circumference.
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Old 03-15-2019, 03:16 PM
  #47  
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Besides faster 0-60 mph time, Lighter unsprung weight also reduces gyro affect so you can turn faster and helps the tires respond quicker to bad road surface imperfections

Last edited by ptran00; 03-15-2019 at 03:16 PM.
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Old 03-15-2019, 04:58 PM
  #48  
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Originally Posted by ptran00 View Post
A pound of weight reduction in the tire has more benefit than the wheel because itís the outer circumference.
Originally Posted by village idiot View Post
lol, I wish.

It's not even a static conversion, but a good rule of thumb is 2:1 for tires and 1.6:1 for wheels
http://hpwizard.com/rotational-inertia.html

Otherwise, 20lbs for gyrodiscs, 24lbs for forged 18" wheels and 20lbs for tires and I'm at the equivalent of nearly 200lbs of static weight reduction.
Yeah, I know. I said that.

Originally Posted by ptran00 View Post
Besides faster 0-60 mph time, Lighter unsprung weight also reduces gyro affect so you can turn faster and helps the tires respond quicker to bad road surface imperfections
Unsprung weight has no bearing on gyro effect. That's rotating mass, which can be sprung (flywheel, crank, driveshaft, etc) or unsprung (rotors, wheels, tires). The "gyro effect" is interia, which is why it's worth more than regular sprung, static mass.
Unsprung mass (control arms, wheels, rotors) are more effective weight reductions because, well, they're not on the suspension.
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Old 03-15-2019, 06:11 PM
  #49  
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Originally Posted by village idiot View Post
Yeah, I know. I said that.


Unsprung weight has no bearing on gyro effect. That's rotating mass, which can be sprung (flywheel, crank, driveshaft, etc) or unsprung (rotors, wheels, tires). The "gyro effect" is interia, which is why it's worth more than regular sprung, static mass.
Unsprung mass (control arms, wheels, rotors) are more effective weight reductions because, well, they're not on the suspension.
... the distance of the weight from its axis (axel) matters as well. The further away from the axel the weight is, the more it matters. A heavy 20inch wheel/tire is worse than a similar weight 18 inch. Wheel weight savings in the drums is worth more than in the spokes. Rotational weight is the most harmful but the distance of the weight from the axel plays a bigger part of the calculation.
Quiz to follow.
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