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Old 11-29-2011, 01:32 PM   #1
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Unsprung weight.

Does anyone know the unsprung weight for the stock rx8? I know this will vary on the wheels and tires but those numbers can easily be found.

Even better does anyone know the sprung weight front and rear?


Thanks!!!
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Old 11-29-2011, 01:58 PM   #2
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Hmm.

Well you'd have to find the weight of your wheels, brake calipers, brake rotors, studs, lug nuts, brake shields, and control arms and that would give you an approximate unsprung weight number, then just subtract that amount from the total weight of the car for sprung weight.

Total weight distribution is like 51/49 front/rear so the sprung weight numbers will probably be close to the same over the front and rear.
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Old 11-29-2011, 02:07 PM   #3
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There's a thread with a bunch of parts weight. It may help you find some data.
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Old 11-29-2011, 03:01 PM   #4
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Thanks for the info so far. I was hoping someone already had this for the stock car. I might have to bust out the calculator and look up those weights.
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Old 11-29-2011, 11:58 PM   #5
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Why you want to know? Just curious.
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Old 11-30-2011, 12:17 AM   #6
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Quote:
Originally Posted by Arca_ex View Post
Hmm.

Well you'd have to find the weight of your wheels, brake calipers, brake rotors, studs, lug nuts, brake shields, and control arms and that would give you an approximate unsprung weight number, then just subtract that amount from the total weight of the car for sprung weight.

Total weight distribution is like 51/49 front/rear so the sprung weight numbers will probably be close to the same over the front and rear.
I thought the 8 had a 50/50 weight distribution?
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Old 11-30-2011, 12:50 AM   #7
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I thought the 8 had a 50/50 weight distribution?
Depends on how much gas you have in it.
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Old 11-30-2011, 01:03 AM   #8
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Quote:
Originally Posted by Arca_ex View Post
Depends on how much gas you have in it.
Is that with or without driver?
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Old 11-30-2011, 10:24 AM   #9
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Quote:
Originally Posted by monchie View Post
Why you want to know? Just curious.
I wanted to do some math .

A good web based example.

http://farnorthracing.com/autocross_secrets16.html

And my garage is really small, really uneven, and really cold .

I just wanted some rough numbers to play with.
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Old 12-01-2011, 12:08 AM   #10
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I thought the 50/50 weight is just the car...without the driver and gas?
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Old 12-01-2011, 12:09 AM   #11
I HATE SPEEDBUMPS!
 
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Quote:
Originally Posted by Agent XY View Post
I wanted to do some math .

A good web based example.

http://farnorthracing.com/autocross_secrets16.html

And my garage is really small, really uneven, and really cold .

I just wanted some rough numbers to play with.

Just wanted to know, thanks.
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Old 04-13-2013, 02:15 PM   #12
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Nicholas Stantz
2 year old bump, but yes I am curious about this.
My old Subaru had a ratio of sprung vs unsprung of 7:1 .
Has anyone done the math for the rx8?
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Old 04-13-2013, 02:15 PM
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