ChrisLeary
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 posted on 19/9/12 at 06:18 PM |
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Spring rate
Evening all,
I've had a search and I understand that spring rates are very much individual to a car, but can someone please give me a rough idea of spring
rates I will need for a tiger locost, 2l zetec silvertop with irs.
I'm not sure what's fitted at the moment, but the springs are too long so they need changing anyway.
Thanks in advance,
Chris
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rodgling
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| posted on 19/9/12 at 10:07 PM |
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I think most run in the 150-350 range, depending on car weight...
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ChrisLeary
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| posted on 20/9/12 at 12:09 PM |
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Cheers for the reply Rodgling, only 150 to 350 is quite a large range...
Anyone any ideas?
Many thanks,
Chris
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Bluemoon
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| posted on 20/9/12 at 01:51 PM |
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Ring tiger?
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ChrisLeary
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| posted on 20/9/12 at 05:40 PM |
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quote:
Originally posted by Bluemoon
Ring tiger?
I would if it was, but it's a locost based on a tiger chassis as far as I know...
Chris
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Toltec
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| posted on 20/9/12 at 07:52 PM |
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The chap who designed my car told me a rule of thumb to get close.
Take the corner weights and add each side together so you have a front and rear weight in kilos.
Front springs subtract 50KG and spring rate in lbs should equal the weight in kilos
e.g 250Kg - 50Kg = 200lb/inch springs
Rear springs add 50Kg and spring rate in lbs is the weight in kilos.
Having done some reading recently and being of a more mathematical mind I did a bit of analysis with a spreadsheet for my car and his suggestion was
pretty good.
There are some interesting articles on http://www.optimumg.com/technical/technical-papers/ in the springs and dampers section.
[Edited on 20/9/12 by Toltec]
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ChrisLeary
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| posted on 20/9/12 at 08:02 PM |
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quote:
Originally posted by Toltec
The chap who designed my car told me a rule of thumb to get close.
Take the corner weights and add each side together so you have a front and rear weight in kilos.
Front springs subtract 50KG and spring rate in lbs should equal the weight in kilos
e.g 250Kg - 50Kg = 200lb/inch springs
Rear springs add 50Kg and spring rate in lbs is the weight in kilos.
Having done some reading recently and being of a more mathematical mind I did a bit of analysis with a spreadsheet for my car and his suggestion was
pretty good.
There are some interesting articles on http://www.optimumg.com/technical/technical-papers/ in the springs and dampers section.
[Edited on 20/9/12 by Toltec]
Thanks Toltec, thats great, I'll have to get some heavy duty scales and get some corner weights and go from there then.
Thanks again,
Chris
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Toltec
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| posted on 20/9/12 at 08:38 PM |
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Should mention my car is mid-engined so it might not hold for front engine cars.
The equation solved for spring rate in the first pdf is easy to set up in a spreadsheet.
I ended up with a frequency of about 2.3 hz and the rear at 13% higher and the spring rates came out to those suggested for my car.
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scutter
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| posted on 20/9/12 at 10:00 PM |
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Chris, Does This help from about a year ago.
My live axle car runs 275 fonts and 180 rears.
ATB Dan.
The less I worked, the more i liked it.
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