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libra springs 
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Post Re: libra springs
gtmdriver wrote:
Thanks for finding that series of posts.
So there you are. According to the data supplied by Bob the calculated spring rates to give a Libra a ride on the firm side of sporty should be
200 lb/in Front
320 lb/in Rear


gtmdriver wrote:
Yes. It can be applied to any car, but you need a lot of information up front. Things like total weight, weight distribution, sprung and unsprung weight and so on.


Will the honda pu not alter the total weight and it's distribution ?? and thus also the end result :?:

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Tue Mar 22, 2016 11:51 pm
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Post Re: libra springs
Yes it will.

By how much is impossible to say without having the figures to work with. That's why I qualified it by saying 'according to the data supplied by Bob'.

If somebody is prepared to give me the correct figures I can easily do the sums for them.

This is what I need.


Total weight including driver.
Front / Rear weight distribution including driver.
To calculate total weight at each corner.

Un-sprung weight at each corner.
To calculate sprung weight at each corner.

Front Lever Ratio. (Wheel movement/Spring movement).
Rear Lever Ratio. (Wheel movement/Spring movement).

Front fitted spring length with the car at the correct ride height.
Rear fitted spring length with the car at the correct ride height.

Chosen front wheel frequency.
Chosen rear wheel frequency.

The natural wheel frequency (cycles /min) is your choice and determines the overall 'feel' of the suspension. As a guide it should be around 60 – 80 for a comfortable road car, 80 – 100 for a sportier car and 100 – 125 for a circuit racer on smooth tracks. (Alan Staniforth). The front and rear wheel frequencies cannot be the same or the car will oscillate in pitch (backwards and forwards). It is normal to set the front wheel frequency 10 -20 c.p.m lower than the rear.

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Wed Mar 23, 2016 2:21 pm
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Post Re: libra springs
Interesting reading, shame I just got the protechs with their standard 250 front 300 rear as it doesn't feel right at all. Rear sags a lot more than front it seems and front feels light. Especially with more weight at the back as its Honda engined.

Thinking of trying 225 / 350

Any suggestions?

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Mon Jun 06, 2016 7:41 am
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Post Re: libra springs
Or maybe just go stiffer at the back for now so at least the front and rear are sagging more equal

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Mon Jun 06, 2016 7:44 am
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Post Re: libra springs
https://kitnet.uk/community/threads/suspension-topics-springs.319/

There is some interesting info in this link from suspension guru Dave Gallop. Not sure I fully understand it though...


Mon Jun 06, 2016 7:49 am
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Post Re: libra springs
I've just changed my 300lb rear springs for 400lb springs. It feels much much better :D
Its firmer but not uncomfortably so. Nowhere near as saggy & not bottoming out - as it used to with the 300lb springs!
So i've now got 225lb front & 400lb rears. It feels the best i've had since owning the car.
My personal suggestion now is: 225-250lb fronts & 375-425 rears. This is for road use, not track!

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Tue Jun 20, 2017 8:08 pm
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