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Old 06-28-2003, 10:02 PM   #1
Heather
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Lightbulb Unsprung weight really does matter!

When I was more ignorant of unsprung weight last year, we put on Michelin Pilot XGT H4 tires on our 2002 GT wagon. Then I became enlightened through the book, "How To Make Your Car Handle" by Fred Puhn and the MRT WRX in Training book. My interest was in 17" wheels for my WRX wagon, then I learned how little choices I have in the correct offset and trying to find a wheel that weighs less then the stock 16.5 pounds was impossible- with the correct offset. Anyway my point is, through the process of learning of unsprung weight and wheel weights, I learned about tire weights as well. I found that the tires I put on my WRX when I bought her, Michelin Pilot Sport A/S weigh only 22.26 pounds each and the ones on our GT weigh 27 pounds each! So we decided to get the Sport A/S on the GT which I did last week and here's the results of a 20 pound drop in unsprung weight:

AMAZING She accelerates so much quicker now. I mean I barely step on the gas and she revs to 4,000 RPMs whereas before I did not feel that at all. I can honestly say she almost feels like she has a turbo like my WRX! And she also decelerates faster and brakes more effeciently. I do not know what they did with the Legacy different then the WRX as far as the brakes are concerned, but they feel much better in the Legacy. I did not do any formal stopwatch tests or anything like that, but I did not have to, you can feel the difference so clearly it is amazing. Unsprung weight matters people! Do not put on heavy 17" wheels and heavy tires. I know most tire weights if anyone has a question. Most do not vary much. Toyo T1-S is the lightest at 20.9 pounds and Bridgestone RE950 is the heaviest, along with the XGT H4 at 27 pounds. Most are between 22 and 24 pounds.

I wonder what else can I lighten-up the unsprung weight with?
Heather
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Old 06-30-2003, 04:58 PM   #2
Heather
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Old 07-01-2003, 10:01 AM   #3
lucien2
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What's left? Wheels- the biggest part of the unsprung mass equation. Significantly lighter rims will probably set you back a grand or so for 16" Volks or OZ or Prodrives since you don't want to go to 17". After that? Brakes, and suspension bits. To acheive significant reductions in weight in these 2 areas, you are looking at ceramic and aluminum respectively. That's mucho $$$$.
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Old 07-01-2003, 10:06 AM   #4
Heather
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Thumbs down mucho money

Nay, I do not want to spend mucho money on the car. I am happy with the unsprung weight reduction she already has, besides the GT wheels look perfect on the silver car. Now I do have thoughts of SSR Comp wheels for my WRX someday in 17" (don't tell my husband) but I will wait until we can afford them. 12 pounds each! Also I will have to research the brakes option a lot more. That is one area I am clueless on so far.
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Old 07-01-2003, 10:40 AM   #5
danci1973
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Forgive my ignorance, but is 'pound' = 'lbs' ? If so, your total wheel weight (ie. wheel + tire) is 38.76 lbs or 17.58 kg (per wheel)?

Gotta check the weight of my wheels tonight...

D.
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Old 07-01-2003, 11:11 AM   #6
Heather
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Post That's about right

Quote:
Originally posted by danci1973
Forgive my ignorance, but is 'pound' = 'lbs' ? If so, your total wheel weight (ie. wheel + tire) is 38.76 lbs or 17.58 kg (per wheel)?
D.
Yes it is in pounds. Wheels 18 pounds. Tires 22 pounds.
Total 40 pounds per wheel/tire combo. Still stock weight mind you. We were dumb and last year put on 27 pound Pilot XGT H4's without knowledge of the tires weight. She just got on her 22 pound Pilot Sport A/S last week, which brought the weight back to the stock RE92's exactly. What a difference in acceleration!

Heather
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Old 07-01-2003, 11:17 AM   #7
nitrohuffer
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Its a fine line between lightweight advantages and handling tradeoffs. For me I prefer a lightweight 17"rim(15lbs) and a lightweight tire. I like the added sidewall stiffness on the track, but I like the extra zoot and softer ride of 16's. Good right up Heather! Have you started to save for the '05 yet? mmmmm 2.5l turbo droool.
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Old 07-01-2003, 04:28 PM   #8
Heather
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Lightbulb

Quote:
Originally posted by nitrohuffer
Its a fine line between lightweight advantages and handling tradeoffs. For me I prefer a lightweight 17"rim(15lbs) and a lightweight tire. I like the added sidewall stiffness on the track, but I like the extra zoot and softer ride of 16's. Good right up Heather! Have you started to save for the '05 yet? mmmmm 2.5l turbo droool.
Everytime I see your name I see that red eyed dog from the photo you posted like a year ago, the droool comment made me see that same dog drooling

We will not be getting the 2005 Legacy. My WRX is our 10th Subaru and we are both finally really happy with our cars. Just keep me away from the Dealerships
Heather
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Old 07-01-2003, 06:41 PM   #9
US2JDM
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Go with inverted struts, lighter control arms, and if you're crazy about unsprung weight reduction...convert your rear brakes to drums and use perfromance brake shoes.
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Old 07-01-2003, 07:35 PM   #10
nitrohuffer
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Quote:
Originally posted by Heather


Everytime I see your name I see that red eyed dog from the photo you posted like a year ago, the droool comment made me see that same dog drooling

We will not be getting the 2005 Legacy. My WRX is our 10th Subaru and we are both finally really happy with our cars. Just keep me away from the Dealerships
Heather

HAHAHA! I've heard that one before! So what color are you going to get?
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Old 07-01-2003, 07:57 PM   #11
JC
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Quote:
Originally posted by US2JDM
Go with inverted struts, lighter control arms, and if you're crazy about unsprung weight reduction...convert your rear brakes to drums and use perfromance brake shoes.
By lighter control arms I assume you mean the AL ones. I don't think they are actually lighter, just stiffer. Ti coilovers would be the way to "go crazy." My friend has some, crazy stuff.

JC
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