Wheel weight...

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kustomizm
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Wheel weight...

Postby kustomizm » Wed Mar 12, 2014 9:03 pm

Curious how much unsprung weight of wheels truly matter. Negative effects on handling? Rotating inertia.. I understand that spinning something that weighs 50lbs at the edges of the car with actually act as more weight than it is due to inertia. But dropping a few pounds really matter on a 3600lb car?
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Re: Wheel weight...

Postby Rocwandrer » Wed Mar 12, 2014 9:28 pm

I don't do the short version of anything well, but let me try on this one: Does wheel weight matter? On your car, NOT AT ALL.

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Re: Wheel weight...

Postby kustomizm » Wed Mar 12, 2014 9:29 pm

Nice. Haha.
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Re: Wheel weight...

Postby WildPony » Thu Mar 13, 2014 4:39 am

Rocwandrer wrote:I don't do the short version of anything well, but let me try on this one: Does wheel weight matter? On your car, NOT AT ALL.

A new world record! :lol:
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Re: Wheel weight...

Postby eg8tuner » Thu Mar 13, 2014 8:46 am

on our cars? :D
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Re: Wheel weight...

Postby saabman » Thu Mar 13, 2014 11:07 am

Wheel weight is rotational mass the must be accelerated by the drive train (the same as your flywheel). As such lighter is better but the heavier the car the less impact it has on overall acceleration (this is what Richard was implying)
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Re: Wheel weight...

Postby SoloSE-R » Thu Mar 13, 2014 11:35 am

I agree that with that vehicle/weight/power level with street tires limiting traction, wheel weights are not going to present a noticeable effect on straight line acceleration. I don't think you should ignore wheel weight's effect on handling, especially on rough surfaces though. The lighter the wheel the less work the shocks have to do to dampen its motion and the more stable the car can be over broken pavement and the more responsive it can be in quick elements. I put a set of Hoosiers with JDM BBS AP1 wheels on my car for an event at Devens a couple years ago (probably about 15lb lighter per corner than the stock wheels/RS3s), and the improvement in composure over cracks and dips was much more noticeable than the acceleration effect.
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Re: Wheel weight...

Postby Rocwandrer » Thu Mar 13, 2014 11:41 am

On a car that can spin the tires at will, the effect Chris mentions doesn't even exist on the drive wheels, and is obviously a minor player at the other wheels. Oddly, the same with very very low power to weight cars (the inertial effect is exponential with acceleration rate).

It is my opinion that the unsprung weight is the more important issue, but the mustang has so much unsprung weight that what can be saved off the wheels represents a negligible value for the money. <---edit: this is addressing the same thing Josh posted about while I was typing.

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Re: Wheel weight...

Postby robinlsb » Thu Mar 13, 2014 12:23 pm

SoloSE-R wrote:I agree that with that vehicle/weight/power level with street tires limiting traction, wheel weights are not going to present a noticeable effect on straight line acceleration. I don't think you should ignore wheel weight's effect on handling, especially on rough surfaces though. The lighter the wheel the less work the shocks have to do to dampen its motion and the more stable the car can be over broken pavement and the more responsive it can be in quick elements. I put a set of Hoosiers with JDM BBS AP1 wheels on my car for an event at Devens a couple years ago (probably about 15lb lighter per corner than the stock wheels/RS3s), and the improvement in composure over cracks and dips was much more noticeable than the acceleration effect.


I agree with You, and one of racing grails is to reduce unsprung weight.
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Re: Wheel weight...

Postby MR Chuck » Thu Mar 13, 2014 2:33 pm

light is right.

I certainly wouldnt tell someone to go spend $1500 on wheels just to knock off ~10lbs of unsprung weight. But if you are already buying $1200 worth of wheels, Id probably go the extra few hundred for the lighter wheel.

But Ive spent much more on much less weight savings lb/$. :screwy:

My opinion is that it all adds up. But Im also in a class where Im allowed to do enough to "add up" and make a difference.
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Re: Wheel weight...

Postby kustomizm » Thu Mar 13, 2014 5:20 pm

The wheels I am looking at are 24lbs vs 28lbs existing while gaining an inch in width. But there are 18x10 roughly 19.2lbs available but roughly twice the cost or about $1200. I didn't know if the additional weight would be worth the money, sounds like its not for the Stang. It probably sounds heavy but there are actually very few available in the width with the correct offset that work and are reasonably priced.
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Re: Wheel weight...

Postby MR Chuck » Thu Mar 13, 2014 6:06 pm

kustomizm wrote:But there are 18x10 roughly 19.2lbs available but roughly twice the cost or about $1200.


Done! And call it a day. :lol:

Unless you get into stupid expensive stuff, that's about as good as it gets in 18x10 for my car and costs more than $1200.
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Re: Wheel weight...

Postby Rocwandrer » Thu Mar 13, 2014 7:58 pm

We span a few different tax brackets here... save under 20 pounds in wheel weight for $600? There are a DOZEN places I'd spend that money before wheel weight on that car. A middle weight BStreet car? Much more appealing. After dampers.

kustomizm
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Re: Wheel weight...

Postby kustomizm » Thu Mar 13, 2014 8:37 pm

Richard, I agree cheap wheels with few extra pounds would pay for both sway bars and then some. But thats another time. The wheels I want are unavailable till 4/30. Not a real issue considering its still fine with the wheels I am running now. I still need to spend seat time in learning how to drive more effectively.

It makes sense on a lighter car with less power that a heavier wheel would have a higher impact on acceleration and turning. And less so on the heavier cars. Thanks.
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Re: Wheel weight...

Postby FullAhead » Fri Mar 14, 2014 6:18 am

Not to mention that the whole rear axle assembly on an S197 is something like 180lbs... If we're talking about vertical motion control.
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