Searched around and found this : But which one is correct ?
Front Rates
Torsion Kw (lb/in) Ks (lb/in)
Dia (mm) (Wheel) (Spring)
16 77 90
17 97 112
18 122 138
18.5 137 154
19 152 170
20 187 207
21 227 249
22 273 298
23 327 355
======================================================
> SIZE ( mm) SPRING RATE ( Lb/in)
> 18.8 110
> 21 173
> 22 210
> 23 250
> 24 296
> 25 350
They are both correct, one is for the front end the other rear of a 911.
The chart for the front lists both Wheel rate and actual bar rate. The spring rate is different at the wheel due to basic leverage.
QUOTE |
The chart for the front lists both Wheel rate and actual bar rate. The spring rate is different at the wheel due to basic leverage |
here is the instant G one...
http://instant-g.com/Data/911CoilConv.html
QUOTE (TimT @ Mar 10 2006, 09:17 PM) | ||
What??? you got some splainin to do Joe did you find some of the info at Instant-G? |
QUOTE (Sideways @ Mar 11 2006, 12:31 AM) |
Does this help, this is very simplified...... |
http://en.wikipedia.org/wiki/Occam's_Razor
QUOTE |
Does this help, this is very simplified... |
Ha!! Rich said it more succinctly than I
QUOTE (ArtechnikA @ Mar 10 2006, 09:48 PM) | ||
it doesn't help me understand why a spring would have a different rate if it's at the rear rather than the front, if that's what you mean. wheel rate, sure, but that wasn't the question... |
QUOTE (TimT @ Mar 10 2006, 09:53 PM) | ||
http://en.wikipedia.org/wiki/Occam's_Razor
actually it doesnt help a bit.. When I buy 600# spring for our 935... Im buying a 600# spring.. Im well aware of spring rates, K values etc.. I know about the ratios that delta "x" will impart to the spring/torsion bar etc.. wheel rate and spring rate are intimately related.. as they will be but one thing in the relationship is constant... the spring rate.. (unless of course it is a spring system made from variable rate springs) |
QUOTE |
In its simplest form, Occam's Razor states that one should not make more assumptions than needed. |
QUOTE (TimT @ Mar 10 2006, 09:53 PM) | ||
http://en.wikipedia.org/wiki/Occam's_Razor
actually it doesnt help a bit.. When I buy 600# spring for our 935... Im buying a 600# spring.. Im well aware of spring rates, K values etc.. I know about the ratios that delta "x" will impart to the spring/torsion bar etc.. wheel rate and spring rate are intimately related.. as they will be but one thing in the relationship is constant... the spring rate.. (unless of course it is a spring system made from variable rate springs) |
Thanks for the latin lesson, based on this my first response should have read.
Both are correct.
QUOTE |
however your 935 suspension would be all but devoid of this..... |
QUOTE (TimT @ Mar 10 2006, 10:07 PM) | ||
there is friction.. not much though Aaron, Occams razor is a concept to keep in mind!! its good stuff.. Im an engineer that lives in the KISS... environment.. |
And Steven
Welcome to the club
all is good.. we can all learn
Self confessed....
Tim how do you like the Haltech systems, A friend of mine used to work fro them is Australia.
Over...
Haltech is good.. user friendly.. easy to tune...
at least from my experience.. we have a bunch of cars out there running Haltech.. no problems that I know of
OK.... so a front 21mm torsion Bar Has a spring rate of 240 lbs ???
QUOTE (Sideways @ Mar 11 2006, 12:55 AM) |
The torsion bars are a different length front to rear hence the different rate for the same thickness bar. (rear bars are longer) |
QUOTE (joea9146 @ Mar 11 2006, 07:47 AM) |
OK.... so a front 21mm torsion Bar Has a spring rate of 240 lbs ??? |
QUOTE (TimT @ Mar 10 2006, 09:07 PM) |
Im an engineer that lives in the KISS... environment.. |
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