1 reply to this topic

[Andysgalant]

Hi All,

After digging around trying to find some specks on LH Torana springs this is what I have worked out so far,

Source, asking questions on KS Help line + buying springs and measuring.

 

K=kings springs, H=Holden, F=front/R=rear, L=lowered/S=standard

 

Lowered front KHFL-14, 650 pounds, hub to flair, 300mm (USED) (LH-LX V8 inc SLR & SLR5000)

Lowered rear KHRL-12, 200 pounds, hub to flair, 302mm (USED) (LH-LX V8 inc SLR & SLR5000)

Standard front KHFS-15, 760 pounds, hub to flair, 325mm +25mm (NEW) (Spring from A9X)

Standard rear KHRS-17, 245 pounds, hub to flair, 325mm +23mm (NEW) (Spring from A9X with drop tank)

 

The lowered springs have been installed in the car for months and driven on for a few hundred Kms, The new standard height springs from KS have just been installed.

the LH that is in the example above has,

1. Aftermarket flairs

2. The flairs have not been fitted mm perfect.

3. Major weight differences between mine and stock LH, alloy heads & manifold. 

 

Rear    

KHRL-12, 200 pounds, 1:1 Ratio 200 pounds at the wheel  

KHRS-12, 190 pounds, 1:1 Ratio 190 pounds at the wheel  

KHRS-17, 245 pounds, 1:1 Ratio 245 pounds at the wheel

Front    

KHFL-14, 650 pounds, 2:1 Ratio 325 pounds at the wheel  

KHFS-14, 650 pounds, 2:1 Ratio 325 pounds at the wheel  

KHFS-15, 760 pounds, 2:1 Ratio 380 pounds at the wheel

 

Please keep in mind,

1. The LH,LX & UC Toranas have a 2:1 spring ratio on the front of the car due to the spring location 50% between the wheel and pivot point (Kframe).

2. Vehicle height/ vehicle stiffness is a cross reference between spring height / coil thickness or strength / amount of coils

i.e. 10xcoils 17mm coil thickness @ 300mm will compress much less than 6xcoils 17mm coil thickness @ 300mm. 

 

Thanks,

Andy

Edited by Andysgalant, 23 October 2022 - 01:02 PM.

[Peter UC]

Good info but when considering the ratio that ratio needs to be squared so 2 squared is 4 so divide the spring rate on the front by 4. Therefore:

Front    

KHFL-14, 650 pounds, 2:1 Ratio 162.5 pounds at the wheel  

KHFS-14, 650 pounds, 2:1 Ratio 162.5 pounds at the wheel  

KHFS-15, 760 pounds, 2:1 Ratio 190 pounds at the wheel

 

And the reason is the not only does the ratio increase the force required by 2 but also the spring moves half as much as the wheel which effectively halves the spring rate.