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Old 12-26-2012, 08:23 AM   #35
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Originally Posted by rtcat600man View Post
Yes, I can feel the differance after going from my stock 19's to my Nurburgrung 20's. This was a 5 lb. drop in each corner and it feels lighter on acceleration and handling is better. Even a bigger savings if going from a stock 20" or dropping to 18"Nurburgring's.





Yes, those are correct weights. The WIKI lists the wheel and tires weights for us.
I went from stock 20s to the Nurburgs and lost about 43lbs and holy crap did I notice a diff.


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Old 12-26-2012, 02:03 PM   #36
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Soo what is the weight of 4 rs wheels and tires inflated to 35psi???
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Old 12-26-2012, 03:17 PM   #37
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Soo what is the weight of 4 rs wheels and tires inflated to 35psi???

260.6 lbs. for the SS or RS wheels. All the same.

Air PSI won't make a differnace.
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Old 12-26-2012, 09:44 PM   #38
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Quote:
Originally Posted by rtcat600man View Post
Yes, I can feel the differance after going from my stock 19's to my Nurburgrung 20's. This was a 5 lb. drop in each corner and it feels lighter on acceleration and handling is better. Even a bigger savings if going from a stock 20" or dropping to 18"Nurburgring's.





Yes, those are correct weights. The WIKI lists the wheel and tires weights for us.
Quote:
Originally Posted by kjkjr27 View Post
I went from stock 20s to the Nurburgs and lost about 43lbs and holy crap did I notice a diff.


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That's what I wanted to hear! Really hoping to be able to pull of the upgrade soon, those heavy steelies are killing me.
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Old 12-26-2012, 10:47 PM   #39
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260.6 lbs. for the SS or RS wheels. All the same.

Air PSI won't make a differnace.
Technically, PSI would make a very small difference.
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Old 12-27-2012, 01:16 PM   #40
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Still trying to figure out the weight for the MRT V1s. Scrming didn't know and Apex Chase told me their shipping weight that
Is listed in their system but its more than MRT V2 which I know is not the case...

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Old 12-27-2012, 05:34 PM   #41
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Can you feel the difference after going to the lighter wheels?

That's hard to tell, even if it's 10 hp, 10 hp out of 300+ would be hard to feel the diff.
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Old 12-27-2012, 11:10 PM   #42
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That's hard to tell, even if it's 10 hp, 10 hp out of 300+ would be hard to feel the diff.
I was just thinking back of the envelope calculations where 1 pound of unsprung rotational mass = 10 pounds weight reduction. (If someone has a better number please chime in)

The 18" TSW and Forgestar F14's are about 18.5 pounds a piece, which is a 14.4 lb weight savings per wheel. So a total of 57.6 pounds of unsprung rotational mass (assuming you go with the same tires) would be worth ~570 lbs of weight loss? That seems unreal, but if that number is correct you'd definitely feel it I would think.
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Old 12-28-2012, 06:27 AM   #43
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I was just thinking back of the envelope calculations where 1 pound of unsprung rotational mass = 10 pounds weight reduction. (If someone has a better number please chime in)

The 18" TSW and Forgestar F14's are about 18.5 pounds a piece, which is a 14.4 lb weight savings per wheel. So a total of 57.6 pounds of unsprung rotational mass (assuming you go with the same tires) would be worth ~570 lbs of weight loss? That seems unreal, but if that number is correct you'd definitely feel it I would think.
I have heard that rotational mass is somewhere bewteen 4 and 10 lbs stationary mass. This would put that number for your weight drop on the wheels between 230 to 580 lbs. Probably much closer to the lower end. For sure something you will notice when accelerating.
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Old 12-28-2012, 11:57 AM   #44
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I was just thinking back of the envelope calculations where 1 pound of unsprung rotational mass = 10 pounds weight reduction. (If someone has a better number please chime in)

The 18" TSW and Forgestar F14's are about 18.5 pounds a piece, which is a 14.4 lb weight savings per wheel. So a total of 57.6 pounds of unsprung rotational mass (assuming you go with the same tires) would be worth ~570 lbs of weight loss? That seems unreal, but if that number is correct you'd definitely feel it I would think.
I just read recently, that the 1lb of rotating mass equalling 10lbs of sprung mass is not the norm. Possible yes, but not the norm. I can't remember the explaination given unfortunently.

In our case, its probably on the low end, and so losing 57lbs of unsprung weight is probably more like 2 - 4 times that amount in sprung weight, so 100 - 200 lbs I'd guess.

Even so, that is a FANTASTIC weight loss to unsprung weight. I'd be extremely happy.
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Old 12-29-2012, 09:34 PM   #45
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That's what I wanted to hear! Really hoping to be able to pull of the upgrade soon, those heavy steelies are killing me.
dropping the steelies is one of my favorite mods lol, looks so much better and the 44 lbs i dropped made a big difference in driving feel. car feels more nimble and spins the tires easier now.
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Old 12-29-2012, 10:21 PM   #46
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dropping the steelies is one of my favorite mods lol, looks so much better and the 44 lbs i dropped made a big difference in driving feel. car feels more nimble and spins the tires easier now.
Amen! Also KMP post on weight is a great post to show how weight affects on dyno. Also overall tire diameter as stated in poor man gear change will add as well. This may have been already stated but I got behind on this thread and didn't read all.
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Old 12-31-2012, 12:04 AM   #47
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rs headlights weigh 10lbs each
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Old 01-01-2013, 10:20 PM   #48
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weighed and took out the washer fluid resivor today it weighed 12lbs filled!
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Old 01-08-2013, 11:27 PM   #49
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I just read recently, that the 1lb of rotating mass equalling 10lbs of sprung mass is not the norm. Possible yes, but not the norm. I can't remember the explaination given unfortunently.

In our case, its probably on the low end, and so losing 57lbs of unsprung weight is probably more like 2 - 4 times that amount in sprung weight, so 100 - 200 lbs I'd guess.

Even so, that is a FANTASTIC weight loss to unsprung weight. I'd be extremely happy.

To be able to calculate the equivalent chassis weight of a specific value of Rotational Mass, you will need to compute the following:
  1. The car's weight
  2. The Time it takes to reach a certain speed ( 0-60mph)
Camaro V6 2LT (3751 lbs) (0-60mph: 6s)
40 lbs of (Wheel/Tire saving) = 255 lbs of chassis weight

Camaro V8 2SS (3935 lbs) (0-60mph: 4.7s)
40 lbs of (Wheel/Tire saving) = 233 lbs of chassis weight

Hope this helps
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Old 01-14-2013, 05:02 PM   #50
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Updated.
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Old 01-26-2013, 04:08 AM   #51
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Nobody knows the weight of the v6 rotors?
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